gandalfthegray.

This past 4th of July weekend my friend came to visit in his 98 C5 Vette.

He runs the stock LS-1 with aftermarket heads (AFR) cam, exhaust etc. No supercharger/ turbo/ N2o. The Vette has an auto trans.

I have a 96 993 TT with UMW K16 Hybrid turbo's, Sportec custom tune, Protomotive I/C, Fabspeed exhaust, Tech art sport cats and some other small goodies.

This was roughly 40 mph up until the Vette's trans started to slip at over 100 mph. Needless to say I was hugely disappointed in the result.

http://s173.photobucket.com/albums/w...t=MOV06243.mp4

Quadcammer

quite frankly, I think you did better than expected.

a HCI ls1 can easily put 490whp to the ground.

Your set up makes probably 480bhp, but you have heatsoak to worry about.

weights are similar.

aero goes to the vette.

he pulled maybe half a car.

sounds about right.

pstoppani

I'd say the Turbo setup is good for 470HP at the crank at best...

Quadcammer

^this guy knows better than I.

Certainly not 480rwhp (awhp if anything).

More like 400awhp

TT Surgeon

The small block chevy engine set up like his is capable of a lot of HP(>500hp) and RPMs, I'm surprised it was that close.

JJayB

You ran him where he was in his powerband and you had a little lag as all turbo's do. Try it from a dig and you'll have a different result. His powerband is way up and yours is really a torque motor so he had the advantage from a roll with AT. Use the awd to your advantage, make sure you have the upgraded main shafts.

Porscheholic

Cheer up! I'd take a "slow" 993Turbo any day over a C5, and I say that after having owned and driven a C5 daily for 10 years.

chris walrod

Also remember, from the sounds of his slipping auto, you finished the race, he dnf'd

Quadcammer

an HCI LS1 does not have a "way up" powerband.

They have a fantastic torque curve that is super broad.

Very hard to beat an LSX powerplant.

gandalfthegray.

I would think I would be around 400 whp. I don't know what the Vette makes for sure. I just thought I was going to walk him.

Maybe it was those heavy HRE's.

Greg H.

Kevin's Stage 2 is rated at 460hp at the crank on 93 octane. Unless Gandaf is running a higher octane program, it's hard to believe Sportec found some horsepower Guenter Mandel left on the table.

Greg H.

Quadcammer

Thats pretty low really.

Perhaps porsche's figures are overrated, but the turbo S makes 424bhp.

That would mean the stage 2 kit adds a mere 35bhp.

I can't imagine it isn't more than that.

Before I get a stern talking to, yes I realize the curve will be flatter, boost comes in sooner, etc.

Greg H.

Depends on what you want. I'm sure we could find some tuning and a dyno that will show more horsepower - under certain conditions. There are a lot of threads in the archives about this.

Greg H.

JJayB

"Way up" was used comparatively to the porsche. My memory says that the modified LS1's make the power from 5000-to 6500 over their stock counterparts. Even if the vett had gears which no one mentioned he's at the top of first, porsche in the bottom of second and off boost and the result are predictable as the video shows. The nano second of lag is the downfall of many a turbo street race.

No arguement that the LS1 with heads and cam will easily pull 500 hp which is about the limit of the vett's transmission as the video shows.

The porsche didn't pick the best race for it's configuation and the vett did.

malcolmd

I'm with Greg here. On a long straight My "Stock" UMW Stage 2 on RON 98 runs neck and neck with a 997TT (series 1) 470HP or 353kW per Porsche's figures. Bear in mind that my car weighs about 70kg less than the 997 so 460 to perhaps 465HP is all that she has!

That being said, I also sit neck and neck with a "520HP 996TT". The point being, the 997TT figures are Porsche's and the 996TT's are the tuner's.

All those threads of Bill S, Toby's and Jean testify that there is truth and there is opinion.

Gandalf, it looks like he got on the gas a fraction before you after which you kept with him, although I suspect you had to shift whereas he didn't until the last second after which he backed off. I think he just knew where his "sweet spot" was!