Hi Guys,

As some of you know I'm a porsche 951 owner who has a mildly modified Z as a daily driver. Anyway one of my counterparts on another web board is posting some interesting HP accusations about his LS-1 and if he's correct I think he'll be putting some tuners out of business. I personally think he's stretching the truth by 60ish Hp but I'll let you provide some input and I'll remain neutral.

The car is a 944 turbo that's been transplanted with a Ls-1 (nicely done). Besides the fact that he's dumping everything into a single 3" exhaust, had what appears to be a stock head/intake (maybe some mild port work on the "custom intake"), a "big cam", a ported throttle body, and what appears to be an otherwise stock ls-1 and claiming 475 HP. Am I missing something here or does he have a prototype that's getting him a 125Hp increase? Here's his description.

The engine is an all aluminum LS-1 Corvette V8 modified with headers, big roller cam, titanium valve spring retainers, 7500 rpm rated valve springs, a larger throttle body, and a custom intake manifold. The factory Corvette ECU has been reprogrammed specifically for this car, and a new professionally made engine wiring harness has been fabricated and installed as well. The car is also equipped with a custom deep sump sheet metal oil pan, remote oil filter, and a Lindsey Racing 3 piece engine cross member. The power is estimated to be approximately 475 horse power.

The exhaust is a 2 into 1 design, and is 3" out to the rear bumper.

Here's a link. http://www.tonygarcia.org/944V8/

 

With some well ported LS6 heads, that number is possible. Defiantly doable with some AFR heads or other aftermarket heads.

 

These are stock heads and he claims that his next upgrade is a top end kit (intake & heads) that are going to give him 520 RWHP out of a stock LS-1 shortblock?

 

Are we talking rwhp or flywheel?

 

An LS1 with headers and a cam ????? 475 HP ... no friggin way ...

MAYBE around 400 HP ... Chevy basically got the LS1 to the LS6 with a switch of the cam and heads (and attendant parts) and ended up with 405 HP ... to get 475 would take more than what he has listed ...

 

If it is flywheel i say maybe with a big cam at peak HP, but not RWHP.

He just says "The power is estimated to be approximately 475 horse power"

 

He needs to take a ride in my 02 ZO6! I have 390 RWHP and can whip that car (from what he is doing in the video )

With the "CLAIMED" Power, that light car would have been ALL OVER THE ROAD!

!!!

Im sorry but, he has no where near that much HP!

BC

 

And let me add that the car is UGLY!!!!!!!

I'm sure this cat sunk a lot $$$$$$ into that ride. Why put a Vette engine into a Porsche when you can just buy the real thing

 

YES! There are alot of peaople making 475 crank horsepower out of an ls1 with stock heads. 475 crank hp equates to about 405 rwhp. You have to have a fairly large cam, all the bolt ons and a good tune. Does he have a dyno graph? He is a link to ls1 tech with cam only with stock heads dyno. http://ls1tech.com/forums/showthread.php?t=219024
475 rwhp on stock heads no. But from the flywheel. Easy.

On the exhaust, one 3" pipe will outflow 2 2.5" pipes.

It sound like he has a monster cam in there. He may have more than 475 (crank)hp.

 

Seems a little ridiculous that he would post a video of himself just going back and fourth on the street. I only saw two gears and then he would get off it and slam on the brakes like a scared dog. He should have found himself an open road and cut it loose. Its like sex without penetration.
Clean install though, Not sure he is being toatally honest with his figures.

 

Like everyone says....we will assume that he means FLYWHEEL hp (similar to OEM hp ratings by all auto mfg).....and yes 475 is a pretty easy number to hit.

475 REAR WHEEL hp means over 550 at the crank, and that is NOT possible with stock heads and just bolt ons (unless you go FI or Nitrous).

 

Not with stock LS1 heads nor even PP LS1 heads, not matter what cam he is running.

 

No he is claiming 475 BHP, not RWHP. Out of a stock head, short header, ported t-body, non-ram air car? I'm just not buying a 125 Hp increase with those mods. Does that mean my LS-6 with G5X2 cam, LG pro's, Halltec, and a tune is making 520 BHP? I'm guessing 400 to 415 BHP with those mods considering the exhaust is a 2 into 1 3" set-up.

He claims that he is going to add a top end kit and be @ 520 RWHP. So what he's saying is that with a cam, intake, heads, shorty headers, and a tune he'll be @ 600 BHP (@ 13% driveline loss) on a stock cube motor?

 

Still NO. PP LS1 heads only produce a few extra ponies over stock LS1 heads,
Shorty headers do nothing, and in some cases take away HP. So NO still not there.

the only LS6 motors that I have seen make 550 BHP were World Challenge motors. Very Light wt rotating assemblies, PP WC LS6heads, Fast 90/90 combo, dry sump systems, WC cam, blue printed motor.
Not saying other LS6 combos cant do that to, just that I have not seen one.

 

475 BHP with what you have listed is possible with a great tune, which is not listed. I would tend to be very skeptical. Now the "top end kit" as you call it which is really just the addition of good heads and a tune, well that is truly a pipe dream.