smrx8

iTrader: (1)

when will yours be out ?????

CaptainZoom

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..

Hymee

iTrader: (1)

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.

dmp

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

Hymee

iTrader: (1)

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 :D

Cheers,
Hymee.

Cam

iTrader: (1)

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

Fanman

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.

CaptainZoom

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.

Fanman

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

CaptainZoom

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..

Nemesis8

iTrader: (3)

They make a 5 Speed Manual??

CaptainZoom

You bet!!

IZoomZoomI

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

Shamblerock

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.

guitarjunkie28

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

dmp

...chickens counted before hatched?

Shamblerock

LOL!!

burnoutking999

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

IZoomZoomI

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.

Shamblerock

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?

carguy425

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?

Omicron

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?

Omicron

Count on it! :D

Hymee

iTrader: (1)

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.

Hymee

iTrader: (1)

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.