mark kibort

Is this what the cars are making now?

355rwhp??? WOW Those things are beasts. how are they getting the power up in the 2001 cup car range?

Top secret dyno tuning video. see 1:14 on the video.

355hp, 277 torque. -1 ignition timing, 194 coolant temp, AFR 11.2,

http://www.youtube.com/watch?v=3KqUAQ6uofs

himself

I don't get it. Are they running restrictors or something? My stock 6GT3 dyno'd higher than the video car on what appears to be the same brand dyno (Mustang + AWD). In fact, my lowest pull was 355 at the wheels with 273 Tq.

-td

mark kibort

Thats easy, this is the GS Koni porsche. Its made from the street car carrera.
I think, only this year, they have allowed the "S" to run this season, with some substantial weight.

mk

analogmike

That's ridiculous. I ran one of the fastest GS cars which won a few races last year and I can tell you it was NOT much, if any, over 300HP to the rear wheels. I think that dyno is highly optomistic, it's a stock 997 (not GT3) engine with no internal mods, just exhaust and air cleaner.

himself

I see. Getting a stock [345 crank HP] car to dyno 355 at the wheels is indeed pretty impressive - or not calibrated

-td

TheOtherEric

Interesting. 11.2 at 6100 rpm, then 11.7 at 6800 rpm. I would have expected a bit leaner for a normally aspirated.

mark kibort

yes it is. when I visited a Grand Am race an talked to the BMW guys and the porsche folks at laguna a few years ago, the power was under 300 for the 911s and near 310 for the BMWs. now , it seems they are both a lot higher.

I dont know if this is the S model, that lists at 355flywheel hp or the non S version that is more in the 320flywheel rating. Now, its not uncommon to have tuning (what a concept) bring the hp up 10-15%. (meaning, bringing flywheel hp numbers to the wheels)

Its not ridiculous, but interesting. certainly, its making this kind of hp. I would be surprised if any monkey business was going on there at the the dyno.
My porsche 928 was bone stock with out the cat, only. it dynoed at 290rwhp. after headers, free flow exhaust, basic tune up, and little things like removing maf screens, air box mods, it went to 335rwhp. 8 years later and 110 race days, it was still making 310rwhp. Kind of on scale what is seen here. Plus, I had no access to ECU changes, and from my discussions a few years ago with a couple of grand am teams, the chip re-flash gains quite a bit on the new carerra. (996 and 997). The BMWs are making some pretty big hp out of the 3.2L, so I think its not a stretch to see the 3.6 make 320rwhp and the 3.8 make 355rwhp with some massaging.

Hey, im with you. based on the times and performance at Laguna, 1:37s, I would think they would have to be a little farther north of 310rwhp to run those times, even thinking about some of the cup car suspension mods they are allowed, but at a much heavier weight.

by the way, just to confirm, are the weights listed in the Koni rules, with driver or without?

mark kibort

yep, usually at top tune, mid 12s is what most end up at. However, its safer in the 11s, besides wasting gas, and doesnt sacrafice that much power generally.
Still, thinking that it could pick up 4-5hp by going a bit leaner is interesting as well.

chas911

The engine builder (Bavaro Engineering) for this car is the same builder who builds most of the engines for the 997 Koni Porsches including TRG and others. My son works for this guy and helped build the engine in this car which is owned by Marcus Motorsports. Bavaro was hired by Marcus after the debacle in FL when their win was taken away.

Remember, this car along with all of the Koni 997's are based on a street 997 Carerra and should not be compared to a GT-3 (996 or 997) or any factory race car such as the GT classed Porsches in the Grand Am Rolex series.
Charlie

analogmike

I raced Bavaro's Koni car two years ago and it had good power. He knows how to build a good engine! But no way a non-S engine is making 350HP to the rear wheels legally.

Kerrigan Smith

There is nothing legal about that engine or having your 3.6 engine make that kind of power. The 3.8 is not legal for competition and a legal car should be making about 305-310 at the rear wheels.

chas911

Mike, yes I put you together with Bavaro. You are correct, 350RWHP is very optimistic but I would guess 320RWHP would be attainable.

Charlie

chas911

Kerrigan, thanks for weighing in here!

That engine is legal but no way was it Dynoed at that kind of horsepower when the engine left the shop. I would guess it is much closer to your power numbers. We all know that if we used 5 different Dyno's we would get 5 different RWHP numbers. In my opinion the best use of a Dyno is to use it as a baseline for making changes, not for substantiating an exact power figure.

Charlie

Kerrigan Smith

Charlie,

I agree there are some "happy dyno drums " out there. I believe this might be the engine that was seized by Grand Am and pretty much labled as a 3.8 engine. Can not be sure of that but it did happen a couple of months ago to three teams including this one.

A little surprised that someone actually allowed this action to be filmed and even more shocked that it was put on youtube. You can only hope it is an upset ex employee and not someone sharing a huge brain fart with the rest of us.

chas911

Kerrigan, you are probably correct. I suspect 350RWHP is rather easily attainable with a 3.8L.

Charlie