shelleys_man_06

Do you think the rotary engine's heat capacity could be due to it's high shaft speed?

bureau13

Damn! Can't disagree with you though...

jds

Richard Paul

iTrader: (5)

13, all is not lost. I didn't say anything about loyalty. The woman who is as loyal as a good dog hasn't been born yet. And her mother is dead.

As to the heat, rotating shafts don't pose a heat problem. I think you might look at the seal area. How about this Rotarygod? You out there.

I'm a freshman here but I do know that the rotary needs more air and fuel for a given HP compared to piston engines. About a third extra to be more specific.
That is why it gets poor MPG.

Floyd

Is that due to the shorter leverage the combustion chamber can put on the e shaft compared to a piston engine?

shelleys_man_06

Richard,

What is your idea on the seal area? I am kind of confused about that.

SHOWOFF

I can assure you that if Candy and Cam built this kit and tuned it with only 3 psi that they had a good reason for it. Earlier this year my wife and I stopped by their shop and saw her RX-8 all torn apart. These guys are rotary gods.

They have been working on this project for several months now and if anyone knows the mechanics of a rotary and what it can and can't do it's Candy. I'm sure that once they get the kinks worked out they will be pushing more boost.

At least they haven't been jacking everyone off promising a bunch of B/S with their kit like Sunflower Mazda who can't even get their car to run.

They took the car and actually ran it as hard as they could.

Hats off to Pettit Racing!

Here are a few photos of their shop and customer's vehicles

Jay Goldfarb

Showoff, I agree with you 100%. I am at their shop a couple times a week. The real facts are that the first version to be offered will be at about 5 psi without an intercooler. They aren't happy with the location of the version in their test car. Once that unit is in production, they will turn their attention to a higher output unit. Intercooled (air to air) with about 7 or 8 psi. As I stated before, I will keep all posted as things develope. They will have their first stage in my car by the end of the month for further testing and track testing. I will than get the intercooler once they come up with the proper design. This will be for testing.

After that they will turn their attention to a ported and polished motor that is sitting in their shop now to see what can be done with that.

These guys are real professionals doing what professionals do best. They want the unit right before release. Not like the piggyback computer being sold from Canada that is going fits to many.

WTF no turbo

Oh yea Pettit is top notch no doubt there.Everyone i spoke to there was very knowledgeable and anxious to answer all questions i asked.Im sure with some fine tuning this will get better,but i only put up what i was told and the trolls come out in full force.

On another note Harold @Acosto is almost done there turbo.I was told 12 psi.I was also told he made 211 on dyno NA.Things are looking up i guess.

bureau13

I'm sure that's correct, but everyone (well, some folks anyway) appear to be assuming that reason is limitations of the Renesis. What if its a design choice with the supercharger, as I mentioned earlier in the thread? (Now, I haven't seen anywhere where anyone has stated the type of supercharger they're using...if that has been stated, and I'm wrong...let me know. I'm just theorizing here!) There are a lot of SC kits that use a positive displacement-type blower to boost the low end...where pretty much everyone says the Renesis needs to most help...and if its geared to do that, my understanding is that its going to start putting in a lot of heat as the revs build, and it leaves its band of optimum efficiency. So, maybe to reduce heat from an inefficient blower they've limited its upper-RPM performance?

Now, come to think of it...I don't think I've ever heard of a positive diplacement blower limiting boost over a certain range. Is that possible? Hmmmm...OK, so I may have just shot down my own theory. Somebody that knows this stuff better please chime in!

jds

davefzr

Things are looking up with 211 dyno? I dont think so... and at 12 psi thats horendous is it not?

Speed Force was using 5psi and was hoping for 275 at the wheels....

on top of that, tuning with the e-manage is seeing at least 210.... Why would 211 be good?

Jay Goldfarb

Pettit is going to use a roots type blower. With an intercooler they had 220 HP to the rear wheels. Without the intercooler they were just above 200. This was with borla exhaust and factory cat. With the hi temp cat and mid pipe like I have on my car, I would expect better numbers. Similar to what Acosta is claiming, but without the heat of a turbo. I would be concerned with all the plastic now used that a turbo would melt all kinds of goodies and create havic.

ranger4277

He said that 211 was a normally aspirated figure.. That's how I interpreted it.

Spazm

He said 211 NA.

davefzr

Oh yeah.. got it.. thankx..

Omicron

Exactly.

Bam_Bam39, Butthead, WTF_no_turbo, etc - all of you calm down. Thread cleaned of all the childish attacks and BS. Let's keep on topic or I'll have to close the thread.

WTF no turbo

And it was just getting good....lol jk
Thanks



On another note Acosta told me 300 whp is the target for the 12 psi system.

shelleys_man_06

Are you talking about Acosta Racing's supercharger kit, if it exists, or Pettit Racing's? I wonder if they are using a piggyback computer, or a stand-alone.

Jay Goldfarb

Pettit is using a piggyback computer. There car is still on the west coast with the company supplying the cpu for fine tuning.

Omicron

300 whp has been achieved with 6 Lbs of boost. Don't know why they'd be shooting for that same figure with 12 Lbs of boost. Something isn't right about that.

WTF no turbo

Well he actually said 300 to 350ish.Thats a 120 hp boost with 6psi.Who has done that?

Omicron

Sunflower and SSR, both.

bam_bam_39

so you have seen dyno results of some kind???? or is this just what you have been told by the companies?

also, this is getting really interesting the closer all these companies get to there release dates. cant wait for more power! :D

Hymee

iTrader: (1)

I thought I made it clear that my project was going to use a twin-screw? No, not a "roots" style unit, as in an Eaton . I just haven't mentioned the brand yet. But it has been ordered for the development, and you can get none better.

I just can't wait for it to arrive.

https://www.rx8club.com/series-i-major-horsepower-upgrades-93/hymee-gets-supercharged-part-2-a-36376/

Cheers,
Hymee.

bureau13

Sorry Hymee, I wasn't clear in my statement...I was referring specifically to the Pettit supercharger project.

jds

Hymee

iTrader: (1)

No worries mate. I understand now Sorry for the mis-interpretation.

Cheers,
Hymee.