Keef

Two Rx-8's

One black manual with nav, 245/45/18 in the back and 225/45/18 in the front with Greddy cat-back exhaust

Other yellow manual (mine) with nav, 245/40/18 all around, with Agency Power and mid-pipe (also coolant mod-though it was 65 degrees outside so I doubt cooling was an issue)

We raced 3 consecutive times and each time our cars were accelerating at the same pace...

So being the one without a cat, I'm a little pissed off... I'm not bashing the 8, because indoubtly I love the car more for what it is than how fast it goes... But seriously... I can't believe I waste my time smelling like a lawnmower, sounding obnoxiously loud, and lighting up CEL's just to be the same speed as an 8 with the stock cat...

The only thing that comes to mind, other than the added friction of having 245's on the front, is that maybe I have a slow 8

Has anybody else raced two 8's side to side, one without a cat and seen a difference? Or do all rotaries produce such a drastic range of power output?

dbb

On my old (2003 build) rx8, with a custom 3" cat-back (JunBL racing spiral resonator into twin JunBL racing spiral mufflers), I used to go for drives through the Adelaide Hills (very twisty roads, some of the best driving roads in Australia) with other rx8s that were stock.

I used to be able to clearly pull away from them out of corners and up hills.

Maybe I had a freak motor? Maybe I was driving more aggressively? Or maybe my particular cat back did give the car some extra grunt ...

HCTR154

I wouldn't worry too much about it. Maybe the other car had pulleys or something and made up for the difference. People have been known to fib about what they have or haven't done to their cars!!

dtorre

i've raced a factory freak 8....the ones that put 190 to the wheels......when we lined up being the better driver I would get a nice jump but by the time we hit 70 he'd be back up to me and by 120 he'd be car lengths ahead ((on a track of course )) and when we would line up at 40 to pull to 120 man it was no contest =( this was stock 8 against stock 8

when I put an unresonated midpipe, hks exhaust, and short shifter I could keep up till 90 or so from a launch and was able to keep within a car length or so from 40 -120

dmc27

^ prlly b/c he had a BB.

my 8s faster than yours.

dynamho

I'm not certain, but I think a particular break-in method and LTFT (Long Term Fuel Trim) as a result of a person's driving style may affect the performance of a car.

I believe it's also documented somewhere on this forum that the MAF sensors have varying tolerances (suprisingly large), so this could definitely be a factor too.

Keef

he had nothing done to his car other than what I stated... He's a friend of mine so I know he ain't fibbing on anything...

My car actually did catch up a little but lets say a car's length by the time we hit 100...

I just really expected alot more out of a cat-less Rx-8...

Ike

Why? It has been stated many times on these forums that basic mods like that won't do much for the RX-8.

Phantom Menace

1) The colors of the car and having, or not having a Navigation system, does not interfere with the car's acceleration. Sans "GO-FASTER-STRIPES," they add 4hp (see "pinstriping" thread)

2) Maybe...it's not the car?
*hint: USER ERROR

Nopstnz

Agree, its the driver most likley.

Keef

well I'll agree that our driving differed... but when it came down to it we just accelerated at the same pace...

and I know color's mean nothing I was just trying to explain a difference....

Gambit

midpipe/exhaust will not make a noticeable difference to the speed of the car

you're lucky his wasn't red. He'd have stomped you. It's well known that red is the fastest color.

Keef

hahahaha.... Maybe that's why a once Red Evo beat the chit outta me...

I guess all I've learned is that the RX-8 is not really restricted when it comes to exhaust...

06RX8

What car can an RX8 actaully beat of a roll? I just got mine so i never really punched it too hard through 1st, 2nd and 3rd. Love the car, but it doesnt feel as fast as my 03 rsx type s did?

Nopstnz

rx8 is much faster than stock 03 rsx-s. 05-06 not quite as much.

dtorre

lmao the funny thing is he did have a BB I swear to God

Ike

Actually the RX-8 is probably a little faster than the 02-04 and a little slower than the 05-06.

SureShot

Other variables:
Were you carrying any extra weight?
Same ECU flash?
Dirty Air cleaner?
Any Aero differences? (windows down or up etc.)

Razz1

I agree it depends upon driver and how you drive the car. If the fuel trim is off your frocked.

He probably drive more aggresive than you and is a better driver.

Anyhow each motor is different.