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Turbo'd 8 vs. Supercharger 8

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Old Oct 19, 2009 | 12:25 AM
  #51  
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Originally Posted by paulmasoner
cool Be aware that with the current blower being used, you wont get near 400 wheel without some serious charge cooling(ie injection) hell, you'll be spraying something to do that with any of the TC 'm thinking of too, but not necessarily as a matter of necesity - now that i think of it, I can't remember if you said that was a target, or if it was just an arbitrary #

also, exhaust ports are whats limiting the motor in terms of flow capacity right now, and unfortunately they cant get any larger. you can reshape them to a degree and yes technically increase their size, but only on the miniscule of scales.
Understood. 400whp was a target that I was given in a discussion about a street mod RX-8 with Jason Rhoades (national champion) earlier this year. This was a hp target that he felt the car needed to achieve based on it's minimum weight in the class.

IIRC, Juan (marsreder100) got 330whp and 214 wtq at 9.6psi of boost on his Pettit s/c kit. He's currently hitting 2-3 psi higher, so it'll be interesting to see what his new numbers will be whenever he gets around to re-dyno'ing the car.

Edit, here's his dyno plot:

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Old Oct 19, 2009 | 08:21 AM
  #52  
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Actually I believe those dynos were achieved at 11.6psi, our pulley is limited to 13psi so thats the difference in boost,,, in addition he has a very long list of supporting mods, ie upgrade ignition, W/M, headers, etc etc etc...
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Old Oct 19, 2009 | 08:46 AM
  #53  
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Originally Posted by Rotr8
Actually I believe those dynos were achieved at 11.6psi, our pulley is limited to 13psi so thats the difference in boost,,, in addition he has a very long list of supporting mods, ie upgrade ignition, W/M, headers, etc etc etc...
Well, this is from the horse's mouth...

Originally Posted by marsredr100
Well guys and girls I took the car this morning for a dyno test after my last mods. Everything looked promising to brake the 400 whp but to my and Bastage disappointment my car was only able to achieve 327 whp on the first pull and 330 whp on the second. I think all the time spent researching and mods trials did not come to fruition. I’m contemplating listing the car on eBay…NOT!
Originally Posted by marsredr100
http://www.youtube.com/watch?v=Jk99SuPrCp8

http://www.youtube.com/watch?v=mtINFMTOUdY

9.6 psi on 3rd gear dyno.

11.3 psi on 4th gear on the highway.

12 psi on 5th gear on the highway.
Link: https://www.rx8club.com/showthread.p...27674&page=155
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Old Oct 19, 2009 | 09:02 AM
  #54  
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**** your rigth I was going off what Norm told me Juan barely comes on here anymore,,,
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Old Oct 19, 2009 | 09:09 AM
  #55  
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Juan does have the nicest dyno plots I've seen with a S/C on this car though, decent torque, and great power. Hell, he has as much torque as my gimp dyno runs. Granted I was dynoed with a faulty MAF and only 8.5 psi, but still impressive for a S/C and the curve is sick. I would love to take a ride in that car.
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Old Oct 19, 2009 | 09:22 AM
  #56  
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our s.c's are also loving this cool weather! 40F on the way to work this a.m. and I am almost at the 1K break in on my new engine--oil was at 160F and I said to myself---"WTF--lets do this" Everyone prob knows I have never dyno'ed but I have driven a lot and I KNOW I am over 300hp (at least this morning i was) I can tell you that---3nd and 4 th gears were amazing--didnt even try 1st and 2nd.
Guys --one thing that hasnt been talked about is that once you get over 300hp with this chassis--you have some chassis work to do! And I am not talking about just installing coilovers/bars. It will drive ok if you do just those things but to really get it down, a diff brace and motor mounts need addressing at minimum.
OD
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Old Oct 19, 2009 | 09:40 AM
  #57  
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Originally Posted by Rotr8
**** your rigth I was going off what Norm told me Juan barely comes on here anymore,,,
No worries. That thread is almost 300 pages long and the details are easy to forget. I've just been following it closely for personal reasons. If he's able to get to 12psi on the dyno, he should see ~410whp/260wtq (both numbers are eerily close to the whp and wtq numbers for a well-tuned motorsports version of a n/a 20B).

However, even if he's able to make a 400+whp dyno pull, I'd then need to know what peak boost can be reached in 2nd gear -- as that's the gear I'd use 95% of the time in autocross.
Originally Posted by blackenedwings
Juan does have the nicest dyno plots I've seen with a S/C on this car though, decent torque, and great power. Hell, he has as much torque as my gimp dyno runs. Granted I was dynoed with a faulty MAF and only 8.5 psi, but still impressive for a S/C and the curve is sick. I would love to take a ride in that car.
He definitely does. I know he's mentioned that his car isn't tuned for the W/M injection. He just has it on there for "insurance" against detonation. He also made these numbers on pump 93. Not sure how much rotaries might benefit from race gas, but it's allowed in autocross in any class (as is E85).

While his mod list is relatively long, all of his mods are legal for the Street Mod class. Some might be necessary, others might not. The main thing I'm told about why he makes the numbers that he does (over Bastage's car for instance) is due to his upgraded headers.
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Old Oct 19, 2009 | 10:26 AM
  #58  
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Originally Posted by chiketkd
No worries. That thread is almost 300 pages long and the details are easy to forget. I've just been following it closely for personal reasons. If he's able to get to 12psi on the dyno, he should see ~410whp/260wtq (both numbers are eerily close to the whp and wtq numbers for a well-tuned motorsports version of a n/a 20B).
yeah before I got mine it was only 150pgs long and I have notes that I took 8 pgs long on the thread, questions to ask who to ask, once I did the install the notes stopped but I still read, and try to follow Denny's mad science projects,,,
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Old Oct 19, 2009 | 11:03 AM
  #59  
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Originally Posted by blackenedwings
Most people don't know even a single person with a FI RX-8, let alone multiple types of forced induction in their area, so there aren't a lot of people with experience with them both. Rotr8 and I live in the same area and go to a lot of the same meets though, so if anybody is in the MD/Tri-state area you are more than welcome to go for a ride in my car. It would be even better if Jeff would ever finish tuning it...

, Uh, I'm usually in Columbia if I'm going to DICK'S SPORTING GOODS.
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Old Oct 19, 2009 | 11:21 AM
  #60  
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we know you are in the area you never come out to any of the meets though,,,
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Old Oct 19, 2009 | 12:56 PM
  #61  
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Mahhhhaaaaammmaaaahh --I am a madman--probably been inhaling all that polyurethane and microscopic aluminum dust too long and I have a mixture of hallucinogentic delirium/ and alzheimers. I do have interesting conversation with my jack Russells though. Here kitty kitty kitty. What? Huh?
Damn have to get back to work--cant even enjoy your psychosis anymore without someone butting in.
OD
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Old Oct 19, 2009 | 07:09 PM
  #62  
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Originally Posted by olddragger
our s.c's are also loving this cool weather! 40F on the way to work this a.m. and I am almost at the 1K break in on my new engine--oil was at 160F and I said to myself---"WTF--lets do this" Everyone prob knows I have never dyno'ed but I have driven a lot and I KNOW I am over 300hp (at least this morning i was) I can tell you that---3nd and 4 th gears were amazing--didnt even try 1st and 2nd.
Guys --one thing that hasnt been talked about is that once you get over 300hp with this chassis--you have some chassis work to do! And I am not talking about just installing coilovers/bars. It will drive ok if you do just those things but to really get it down, a diff brace and motor mounts need addressing at minimum.
OD
what about an engine torque damper? that should help...I've been meaning to buy one. I think I will.
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Old Oct 19, 2009 | 10:05 PM
  #63  
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Originally Posted by 05rex8
no.
Actually yes

Originally Posted by Rotr8
I know Bastage and marsredr100 continually invite the local TC guys to come out for shoot outs and to this date non of them have bothered to show up,,,
And incorrect, I have been out to a few of the MSCC autocrosses that Juan participates in and we always seem to be opposing schedules.

Just recently I went to Gainsville invited Juan and he was unavailable with his car.

No biggie, there will be a another day.

And I will be at Roebling Road in Nov and unfortunately Olddragger will be in attendance but will not be running his car because it is not 100% broken in.

Oh well maybe another S/C will step up to plate.

Here is a vid way back at an MSCC event Juan was not in attendance unfortunately.

http://www.youtube.com/watch?v=yvB9lTKnJVc

This was done on completely stock suspension so the car was a bit sloppy.

Now being dialed in suspension wise we as a team are actually going to be competting on a national level in SCCA but that is still up in the air.

And our skill set as Drivers needs more seat time with the new setup. The car drives like it is on rails with the GTSPEC bracing that it has now so it is taking some getting used to.

Also to recap a car doesn't mean **** on the AutoX either BT or SC, the driver makes the car perform not the car making the driver perform.
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Old Oct 19, 2009 | 10:06 PM
  #64  
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^lol! I was just joking.
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Old Oct 19, 2009 | 10:11 PM
  #65  
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How many of you guys have driven both?
How about several examples of both?
How about several examples of both in an "unrestricted" environment?

I didn't think so.

Everything I have read so far about "linear" - here AND elsewhere - is completely wrong. Everything. Pro and con.
No one here knows what the hell they are talking about. Plain and simple.
Same goes for "turbo lag", which, so far, no one has even defined correctly.
Boost onset is NOT turbo lag.

Flame away. I don't care.
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Old Oct 19, 2009 | 10:13 PM
  #66  
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Originally Posted by olddragger
our s.c's are also loving this cool weather! 40F on the way to work this a.m. and I am almost at the 1K break in on my new engine--oil was at 160F and I said to myself---"WTF--lets do this" Everyone prob knows I have never dyno'ed but I have driven a lot and I KNOW I am over 300hp (at least this morning i was) I can tell you that---3nd and 4 th gears were amazing--didnt even try 1st and 2nd.
Guys --one thing that hasnt been talked about is that once you get over 300hp with this chassis--you have some chassis work to do! And I am not talking about just installing coilovers/bars. It will drive ok if you do just those things but to really get it down, a diff brace and motor mounts need addressing at minimum.
OD
You are on the right track,....it really is sloppy with the car with the power kicking in like it does.

I finally can say I am content with the car, When I am up in Savannah in Nov we can go for a drive I will let you drive if you like I can show you what I had to do to nail that front end down. If you look in the videos it was challenging to keep it where you want it to go.
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Old Oct 19, 2009 | 10:16 PM
  #67  
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Originally Posted by MazdaManiac
How many of you guys have driven both?
How about several examples of both?
How about several examples of both in an "unrestricted" environment?

I didn't think so.

Everything I have read so far about "linear" - here AND elsewhere - is completely wrong. Everything. Pro and con.
No one here knows what the hell they are talking about. Plain and simple.
Same goes for "turbo lag", which, so far, no one has even defined correctly.
Boost onset is NOT turbo lag.

Flame away. I don't care.
I completely agree Jeff, and I actually have driven both. No one has even come close to what it really is.

The S/C was refreshing but I had that for a red hot minute before I sold it to Macius8, I still would stick with the BT over the SC.
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Old Oct 19, 2009 | 10:16 PM
  #68  
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oh that's right... NOBODY on this forum is right about anything except for God himself, mazdamaniac.
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Old Oct 19, 2009 | 10:19 PM
  #69  
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Cant wait to finally see yall Race Roots--i will be mooning ya at turn 5!!
really has ticked me off that I cant track--it would have been great--no matter who ends up in front. I usually dont care about that. I learn more by trailing anyway.
We have to get side by side pics..

On the engine torque damper---its always better to do motor mounts and then if you need more then think about the Tq damper.
Our mm are crap for the track. Pretty good for the street but could be better.
Would love to drive it with you in the right seat and i will return the favor if you like.

OD

Last edited by olddragger; Oct 19, 2009 at 10:23 PM.
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Old Oct 19, 2009 | 10:20 PM
  #70  
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Originally Posted by 05rex8
oh that's right... NOBODY on this forum is right about anything except for God himself, mazdamaniac.
How many SC and turbo RX-8s have you driven on the track? Tuned on the dyno? Driven on the street? Sat in?
Go ahead. Enlighten us.

Just because I'm informed doesn't make you stupid. Get over it.
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Old Oct 19, 2009 | 10:22 PM
  #71  
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Originally Posted by olddragger
Cant wait to finally see yall Race Roots--i will be mooning ya at turn 5!!
really has ticked me off that I cant track--it would have been great--no matter who ends up in front. I usually dont care about that. I learn more by trailing anyway.
We have to get side by side pics..

On the engine torque damper---its always better to do motor mounts and then if you need more then think about the Tq damper.
Our mm are crap for the track. Pretty good for the street but could be better.
OD
OD the 6 Point Brace from GTSPEC is the winning deal for anyone running over 300whp on the Track/AutoX. The Motor Mounts absolutely the Tq damper I don't think as much.
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Old Oct 19, 2009 | 10:22 PM
  #72  
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Originally Posted by MazdaManiac
How many SC and turbo RX-8s have you driven on the track? Tuned on the dyno? Driven on the street? Sat in?
Go ahead. Enlighten us.

Just because I'm informed doesn't make you stupid. Get over it.
LOL!!!
it was a joke
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Old Oct 19, 2009 | 10:26 PM
  #73  
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By the way Brice when is that being shipped I put my order in three days ago and havent gotten a shipping confirmation,,,
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Old Oct 19, 2009 | 10:28 PM
  #74  
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Originally Posted by 05rex8
LOL!!!
it was a joke
I'm laughing.
On the inside.
Where it counts.
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Old Oct 19, 2009 | 10:31 PM
  #75  
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Originally Posted by MazdaManiac
I'm laughing.
On the inside.
Where it counts.
the internet is fun....
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