any news on when the pettit racing supercharger is coming out. Im looking forward to seeing the specs/pics on this kit. does anyone have any info on it or prices?

http://www.pettitracing.com/rx8/index.htm

yes ive seen their web site but there is no info on when its coming out, pricing, good pictures, and there is not a lot of percise information on how it peforms.

there should be some more info coming soon. but you could always call or email them and then share the info with the rest of us:)

i actually tried emailing them a couple of weeks ago but i got no resopnse

I talked to Cam from Pettit last week, and Cam told me it will still be about 4/5 weeks. They said they are just trying to provide the best SC they can for the customer and so they are doing some minor tweaking before they release it..

I was on the list for a long time but greddy came out with an awesome kit so I got greddt instead.

im hoping that the pettit supercharger will be a little cheaper than the greddy turbo. what do u guys think? It doesnt have as many parts included and it is easier to install.

I recall hearing the high power Pettit kit would be ~5K, but that was a while back. The low power kit was ~3K.

im hoping that the pettit supercharger will be a little cheaper than the greddy turbo. what do u guys think? It doesnt have as many parts included and it is easier to install.

doubt it, i think the greddy is as cheap as it can get. Unless you're getting the low boost kit from petitt I doubt a s/c for this application be cheaper than a turbo.

bump

dont hold your breath

^^^

Why do you say this? Any information you have that you can share?

it looks like nothing happening on the supercharger end :(

I recall hearing the high power Pettit kit would be ~5K, but that was a while back. The low power kit was ~3K.

So what is the difference between their HIPO and "Low power" kits?

Cheers,
Hymee

i actually tried emailing them a couple of weeks ago but i got no resopnse

I tried also - no response.

I just got off the phone with the sales manager. He will try this weekend to reply to us with news! He said the SC is done, but they have just been too busy with work to get us the details. :D

So what is the difference between their HIPO and "Low power" kits?

Cheers,
Hymee

I think it was an Intercooler only

I like the looks of this kit, and I too have heard that they've worked out the bugs Motor Trend reported early on and are pretty much ready to go to market. No idea on prices, but I'll bet this'll be one of the best power-producing kits on the market. We'll see. Maybe I'll give 'em a call tomorrow. :)

One has the intercooler, and has the boost turned up, the other one is the low (ahem..."standard") power kit

I wonder what mine will be then if I am intercooling it, and using the next larger size blower :)

Cheers,
Hymee.

Dont be too disappointed that they didnt get back to you via email. I dont even think they check it to be honest. The statement that they didnt return my email has been said countless times...

I cant wait to hear more news about this S/C... That would be cool if you would call Omi.

I wonder what mine will be then if I am intercooling it, and using the next larger size blower :)

Cheers,
Hymee.

Hymees, advanced but late to the party :p intercooled supercharged with bigger balls than pettits :cool:

cheers
michael

where is the intercooler mounted? From the pics i can't locate it at all

Correct if I'm wrong, but I think the kit produces about 220 RWHP and 165 FT/LBS. I remember from Sevenstock7 they were saying around 30-50 HP depending on the intercooler option. The one down at Irvine had a water to air IC, but I think they were changing to air to air if I remember correctly. Abel Ibarra got to drive it, and he came back with a big grin on his face...

I wonder what mine will be then if I am intercooling it, and using the next larger size blower :)

Cheers,
Hymee.



when will yours be out ?????

Correct if I'm wrong, but I think the kit produces about 220 RWHP and 165 165 FT/LBS. .


6 lb-ft gain from stock?
My opinion is that the car lacks torque more than it lacks max power..
I want a kit that gives me 200 lb-ft.. Hp-gain is not so important..

when will yours be out ?????

Good question. When it is ready. I have shyed away from promising dates. Have a look in my thread, there is some info on some trials we are hoping to run soon. If only I had a big R&D budget, and time could be thrown at this, but lots of other paid work needs to get done as well.

Believe me, the wait is killing me.

Cheers,
Hymee.

6 lb-ft gain from stock?



No - probably 30-50lbs-ft gain from stock...those figures are 'measured at the wheels' ;)

6 lb-ft gain from stock?
My opinion is that the car lacks torque more than it lacks max power..
I want a kit that gives me 200 lb-ft.. Hp-gain is not so important..

You seem to forget that horsepower and torque are inextricably related to each other. If you get 10% more torque at 2000RPM, you automatically get 10% more power at the same point.

But I know what you mean, it is a common misconception. We tend to relate torque to the bottom end, and power to the top end.

While the RX-8 does not have bucket loads of "low end grunt", it does produce a pretty flat (aka constant) sort of torque curve. This is why the power "curve" is so linear, and you feel a smooth power delivery.

If you did something to double the torque down the bottom end, and it was the same max power (i.e. same top end torque) then assumed a even spread in between, the car would feel funny to drive. It would seem to take off good, but as you accelerated it would feel less and less strong. This is because the torque would be reducing as the RPM increased - remember in this example we doubled torque at the bottom end, but kept it the same up top (to meet your requirement).

I hope that explains it well enough. I know what you are saying though. You are prepared for more usable power in the low to mid-range at the expense of peak power at the top end. That is one of the reasons why I like these type of blowers. They make roughly the same amount of boost down low, right the way through, hence they feel less peaky and better driveability.

End of http://www.hymee.com/smilies/sm_teach.gif :D

Cheers,
Hymee.

I email Pettit over two weeks ago and finally got a response today. Nemesis was spot on with the HP/TQ figures.

Below is the email I received.

THE SUPERCHARGER KIT IS IN PRODUCTION NOW. THE FIRST KITS WILL BE
RELEASED
SOON. THE KIT MAKES ABOUT 220 WHP, WITH ABOUT 165 FT/LBS TORQUE. FINAL
PRICE
HAS NOT BEEN DETERMINED YET. PLEASE KEEP CHECKING OUR WEBSITE FOR THE
LATEST
UPDATES.

THANKS

6 lb-ft gain from stock?
My opinion is that the car lacks torque more than it lacks max power..
I want a kit that gives me 200 lb-ft.. Hp-gain is not so important..

Like a few of the posters above stated that is 165 lb. ft. at the wheels. That is probably around 190-195 lb.-ft of tq. at the crank. Just for reference a stock RX8 usually puts out in the low 130's tq at the wheels.

Like a few of the posters above stated that is 165 lb. ft. at the wheels. That is probably around 190-195 lb.-ft of tq. at the crank. Just for reference a stock RX8 usually puts out in the low 130's tq at the wheels.


My car is a Low Power Euro-version 5 spd m.
It has already got 5-6 lb-ft more torque than the US 6MT.

So you might make it to 200 lb.-ft. afterall.

You seem to forget that horsepower and torque are inextricably related to each other. If you get 10% more torque at 2000RPM, you automatically get 10% more power at the same point.



What happens below 2000 rpm is not interesting for me.
A harder pull from 3500-4000 is what I'm looking for.A kind of BMW-like powerdelivery,if you know what i mean?

I didn't mention,but I have a Low Power 5MT-version.
It redlines at almost 8000..

They make a 5 Speed Manual??

They make a 5 Speed Manual??


You bet!!
http://www.rx8club.com/attachment.php?attachmentid=42211&stc=1

yea i recieved an email from them...

THE SUPERCHARGER KIT IS IN PRODUCTION NOW. THE FIRST KITS WILL BE RELEASED SOON. THE KIT MAKES ABOUT 220 WHP, WITH ABOUT 165 FT/LBS TORQUE. FINAL PRICE HAS NOT BEEN DETERMINED YET. PLEASE KEEP CHECKING OUR WEBSITE FOR THE LATEST UPDATES.

THANKS

I don't know much about supercharging vs Turbo, but Petit's supercharger is a far cry from what SSR claims (292WHP) and Greddy (250-260WHP I think) with their Turbos. If their supercharger is 1/2 the price of a Greddy, then it might make sense, I guess.

after the tuning, we'll make 220 whp at least with the porting.
i can't wait to see what it does with FI

after the tuning, we'll make 220 whp at least with the porting.

...chickens counted before hatched? :)

...chickens counted before hatched? :)

LOL!!

after the tuning, we'll make 220 whp at least with the porting.
i can't wait to see what it does with FI

Withe big ports described in the other thread or like snoochies?

I don't know much about supercharging vs Turbo, but Petit's supercharger is a far cry from what SSR claims (292WHP) and Greddy (250-260WHP I think) with their Turbos. If their supercharger is 1/2 the price of a Greddy, then it might make sense, I guess.


true, if you look at numbers only. Don't forget this is a twin screw s/c though, so power is readily available anytime you depress the pedal w/o having to worry about boost lag. Less peak power, but more low to mid range beef. I doubt this unit be 1/2 the price of greddy, petitt said before its going to be around 5k.

true, if you look at numbers only. Don't forget this is a twin screw s/c though, so power is readily available anytime you depress the pedal w/o having to worry about boost lag. Less peak power, but more low to mid range beef. I doubt this unit be 1/2 the price of greddy, petitt said before its going to be around 5k.

That's true but only 30-35 whp for $5K Seems to be a bit too much. Do you know if it will come with an ECU management system as well?

I regards to what zoom zoom said; does anyone know for sure with the Greddy turbo where the boost starts kicking in? It seems to me (from the video) that you get full boost almost instantly but it doesn't come on 'til about 5k. I can only imagine that the SC peaking at 220 rwhp has got to be pretty equal to the greddy putting out 240rwhp, at least in the 1/4, and probably even better if you are talking stoplight to stoplight. Any backup on this theory?

I wonder what mine will be then if I am intercooling it, and using the next larger size blower :)

Cheers,
Hymee.Ok, so assuming you compare Pettit's intercooled kit to yours Hymee, why would your bigger blower be better unless you're putting out more boost? I think any kit right now is going to be limited to 6 - 8 Lbs of boost, and assuming you stay within this limit, would a bigger unit really have any advantage?

I cant wait to hear more news about this S/C... That would be cool if you would call Omi.Count on it! :D

Ok, so assuming you compare Pettit's intercooled kit to yours Hymee, why would your bigger blower be better unless you're putting out more boost? I think any kit right now is going to be limited to 6 - 8 Lbs of boost, and assuming you stay within this limit, would a bigger unit really have any advantage?

I don't think I posted anywhere before a HP target, or a boost target, but I am aiming for significantly more boost than that. I want to make this worthwhile.

Cheers,
Hymee.

It seems to me (from the video) that you get full boost almost instantly but it doesn't come on 'til about 5k.

Can you explain that to me please? Or is there a typo?? 55% RPM doesn't seem "instantly" to me, in a car with such a wide useful RPM range.

Cheers,
Hymee.

I regards to what zoom zoom said; does anyone know for sure with the Greddy turbo where the boost starts kicking in? It seems to me (from the video) that you get full boost almost instantly but it doesn't come on 'til about 5k. I can only imagine that the SC peaking at 220 rwhp has got to be pretty equal to the greddy putting out 240rwhp, at least in the 1/4, and probably even better if you are talking stoplight to stoplight. Any backup on this theory?

The boost on my Greddy starts to kick in around 2000 RPM, very quick for a turbo, by 4500 I'm at full boost. Seems kind've strange, but it is because I think the turbo is a small size turbo. Turbos in general will almost always make more top end hp than a supercharger as it does not have the parasitic losses of an SC & tend to have more compressor efficiency (notice I said most of the time).

roots--low end
turbos-midrange
centrifugal-top end.

very VERY loosely. but it all depends on your setup.

Oh boy, Fanman, I noticed you were sure to put in "most of the time." I could go into a lecture here but I just had a phone conversation yesterday with Rotarygod, and we agreed to both give up explaining these things. There are more productive things to do. :rolleyes:

Maybe someone else will want to pick up the load on this? :confused:

Yeah, I did preface that with most of the time. In general if you look at the power a turbo is putting out (peak hp figures) vs. a roots type blower, many people would assume the turbo will kill a roots unit, but they go about things in very different ways. The curves will look very different from a roots-type blower, vs. turbo vs. a centrifugal unit. You have to determine which unit fits best for your driving style.

I guess the centrifugal unit from Sunflower kind've went by the wayside.

...I could go into a lecture here but I just had a phone conversation yesterday with Rotarygod, and we agreed to both give up explaining these things....Oh no!!! You guys are invaluable around here with your explaining-things skills! Say it ain't so! :( :eek: :(

You should really just start saving some of those post in word and cut and paste when nessicary....God knows no one is going to SEARCH for the right answer :)

Does the Pettit install retain the OEM airbox?

And what about the Mazdaspeed strut tower brace? Will the Pettit kit install with this brace in place?

I emailed them last year about this and they said they had come up with a way to keep the stock brace. Not sure if it's still true.

And what about the Mazdaspeed strut tower brace? Will the Pettit kit install with this brace in place?

Does the Pettit install retain the OEM airbox?No, they have a new intake.

Ok, now here's a question for all you FI gurus...

I'm pretty sure I'm going to wind up with the Hymee or Pettit twin-screw type supercharger. Either unit will be limited to 6-8 Lbs of boost to protect the otherwise stock Renesis. But down the road a bit, I plan to yank the engine and have it built up stronger to take more boost with an eventual goal of 400-500 WHP. My question is, will either of these units be able to be made to make more boost, and if so, how? Is it as simple as changing the S/C drive wheel and retuning, or what all is involved? And what is the theoretical limit of boost either of these units can make?

You should ask me that on my thread :)

The theoretical limit for the blower I am using, and it's max RPM limits etc is about 12 PSI. According to Autorotor literature I have, this blower is good for about 400 odd HP. The smaller blower obviously cant go that high.

Interestingly, and you need to think about that - is that both blowers can operate up to 15PSI. The problem is that is dependant on the airflow requirements of the engine. The smaller Pettit blower is rated to about 300HP. It pumps about 0.87 or 1.1 litres of air per revolution (depending on the exact model, which I don't know). The larger unit I am using pumps about 1.33 litres of air per rev. The renesis consumes 1.3 litres of air per revolution. The ratio between the engine's air requirements and the blowers output give you the manifold pressure that is developed (the "boost").

I don't think the boost level itself is a problem. I guess I'll have to explain myself about that another time, but it has to do with the rotors and shafts used in 6 and 7 second, 1000HP plus drag racers.

Anyway - the wait on this is killing me as well!

Cheers,
Hymee.

And yes, you adjust the boost on these by changing the drive ratio.

A more important thing to remember is that a piston engine on average makes about 10 hp per pound of air (not boost btw) whereas a rotary makes about 7 hp per pound of air.

A more important thing to remember is that a piston engine on average makes about 10 hp per pound of air (not boost btw) whereas a rotary makes about 7 hp per pound of air.
Is this a general rule? Or is this something that could be changed with further developmental research of the rotary? I always figured that with the R&D that went into the piston engine it should make more power/be more efficient. I'm hoping that the rotary engine has more potential through research. Of course this will take years but it should change, right? Thanks.

[QUOTE]Can you explain that to me please? Or is there a typo?? 55% RPM doesn't seem "instantly" to me, in a car with such a wide useful RPM range.

Hymee, what I meant is that it spools up very quickly (to full boost almost instantly) but from what I observed, it didn't seem to make any boost until 5k.

I still don't get it. It spools up "instantly", but you have to wait till you get to 5000RPM???

Maybe its time to call me stupid or something. :(

Cheers,
Hymee.

aoshi, This is a lesson I had to learn the hard way. I built the first SC for the Rx8 thinking that it needed the same CFM for a target HP that other engines use. I had to build a whole new one when we found this out, which was when we put it on the dyno.

The clue should have been the gas milage. For this much power it uses to much fuel. That can only be blamed on inefficency.

As for your speculation as to development of the rotary being behind. well it only takes about 10 other manufacturers doing intence development on rotarys for about another 50 years. The problem is that there is only one very small company working on this project. It will take a lot more diverse thinkers, meaning other brain trusts at other companys to find new ideas in the basic envolope of rotarydum.

I don't see this happening in the forseable future. If there is something that they would work on besides these silly hybrids it should be a small inexpensive turbine. They need to work out the throttle response problem which might not be solvable.

There are tons of ideas out there that might or might not work out. It is just that the Otto cycle engine in it's current piston configuration is so well developed and the parts are cheap. Everyone knows how they work and they do not want to give it up. Anything else is going to be expensive until it has been around for many years. In my lifetime I don't have to worry about having to work on anything else.

It remains to be seen about you. But I wouldn't miss the opportunity to learn about current engines thinking it's similar to wooden wagon wheels.

You stupidbastard ;)
You somethingbastard :p

[QUOTE]Can you explain that to me please? Or is there a typo?? 55% RPM doesn't seem "instantly" to me, in a car with such a wide useful RPM range.

Hymee, what I meant is that it spools up very quickly (to full boost almost instantly) but from what I observed, it didn't seem to make any boost until 5k.


HUH? :confused:

aoshi, This is a lesson I had to learn the hard way. I built the first SC for the Rx8 thinking that it needed the same CFM for a target HP that other engines use. I had to build a whole new one when we found this out, which was when we put it on the dyno.

The clue should have been the gas milage. For this much power it uses to much fuel. That can only be blamed on inefficency.

As for your speculation as to development of the rotary being behind. well it only takes about 10 other manufacturers doing intence development on rotarys for about another 50 years. The problem is that there is only one very small company working on this project. It will take a lot more diverse thinkers, meaning other brain trusts at other companys to find new ideas in the basic envolope of rotarydum.

I don't see this happening in the forseable future. If there is something that they would work on besides these silly hybrids it should be a small inexpensive turbine. They need to work out the throttle response problem which might not be solvable.

There are tons of ideas out there that might or might not work out. It is just that the Otto cycle engine in it's current piston configuration is so well developed and the parts are cheap. Everyone knows how they work and they do not want to give it up. Anything else is going to be expensive until it has been around for many years. In my lifetime I don't have to worry about having to work on anything else.

It remains to be seen about you. But I wouldn't miss the opportunity to learn about current engines thinking it's similar to wooden wagon wheels.


Thanks Richard. I've been reading as much as time allows me the last few months trying to learn what I can. To be truthful, it's been this forum that has taught me the most. Between your axial flow thread, RG's 3859489485 pages posts about all sorts of different things, Hymee's posts and all the other gurus out there. I appreciate all the interesting stuff I've learned. Thanks again guys. *Tear* :p

.......

Any news..?

like the title says....

yeah, i'm looking forward to the release of this kit too. any news anyone?

One of you could call them and get some news :)

I just emailed these guys about the price range of the SC. But incase they dont answer any ideas how much $$$?

I have updates. Pm me if you want them and if I like you I will give you the info.

The 2 people above my last post who asked for updates but were too lazy to get them themselves can pretty much not bother asking. :p

Why not just post them?

You can :)

I just wanted to be a prick.. You can usurp my prickness.

Nah... not really lazy.. just scared.. there is a difference. I know if everyone and their mother were calling me for a status update and the project was not on schedule or having difficulties that I would be less than enthusiastic about giving such an update. Thats why I dont like calling.. Scared yes :) lazy no..

Someone :rolleyes: called Pettit this morning. This is what that person was told: They are finishing tooling. The web site will be updated soon, no release date yet. There will be one kit, puts down 250 to the wheels and approximate cost of $3800.

Don't ask me any questions - I know nothin' :D

Someone :rolleyes: called Pettit this morning. This is what that person was told: They are finishing tooling. The web site will be updated soon, no release date yet. There will be one kit, puts down 250 to the wheels and approximate cost of $3800.

Don't ask me any questions - I know nothin' :D


Sounds PERFECT! :) cool! On Warren's car, that could be 270whp!! :D

hehe

I'd be skeptical about that price - I remeber hearing it would be more. We can only hope they lowered the price.

I'd be skeptical about that price - I remeber hearing it would be more. We can only hope they lowered the price.


No reason to be skeptical - I'd guess a SC mounting would be less expensive to produce - once the jig is made, etc, than all the piping required for turbo applications.

Yeah, you're cool. I didn't even know who those "two" people were! I saw it was you after I posted and said to myself "damn, he's cool, i shouldn't have done that :D"

Nah... not really lazy.. just scared.. there is a difference. I know if everyone and their mother were calling me for a status update and the project was not on schedule or having difficulties that I would be less than enthusiastic about giving such an update. Thats why I dont like calling.. Scared yes :) lazy no..

Well, they need to make it more in range with the greddy kit.. and it costs less to install, etc.. so it balances out somewhat. That may be why the delay in release, to reduce costs?

I'd be skeptical about that price - I remeber hearing it would be more. We can only hope they lowered the price.

Now that would be cool - I see a SC in my future one day...

Yeah, you're cool. I didn't even know who those "two" people were! I saw it was you after I posted and said to myself "damn, he's cool, i shouldn't have done that :D"

It's cool.. no big deal..

I know that I should have tried to sneak into CA. Speedway the day that they were testing the car. That would have been something to watch for sure! What really gets me though is that some people actually got the opportunity to ride in the car at Seven Stock. I was there too!!!!!

Man.. I miss everything :)

Maybe Petitt has come on the forum and seen everyone bitching about the price of the SSR kit and figured $5-6K isnt going to fly.

some people actually got the opportunity to ride in the car at Seven Stock..

I missed that also, but I watched it fly by with Abel driving it. He got out with a big grin on his face - power under the curve - type grin is what I heard... :p

I was last weekend at the NHRA compact series race at Moroso Motorpark in Palm Beach Florida and there was a black RX8 with have some adds in the windshield. The add read like this " RX8 Compressor Coming soon For more info check out Petit Racing.com" The add showed a photo of what it seems is going to be the compressor but it is not a good photo.

I think that the thing that people are missing with the Petit kit is that they want it to be reliable and safe. Anyone can kick out a turbo or S/C kit that just bolts on and runs until the engine is toast. They wanted to crack the tuning and get the car to make safe reliable HP and I respect them for that.