As many of you know, my best friend owns a Protomotive built 3.8L RWD 996TT that made 914 rwhp at only 1.55 BAR on C16. It's one of the mack-daddy Proto builds; GT35R's, Mckenzie heads, custom cams with GT3 cam synchs, GT3 code on the 996TT ECU, etc... he drives it 3-4 days per week and it's an absolute beast. I really love that car.

The max he ever runs it on the street is at 1.35 BAR on 100 octane (he typically only runs 1.2 BAR and smashes everyone that tries him even at that level). I pretty much use his car as the standard to compare to with regard to acceleration.

When I had my 722 rwhp Z06, we raced multiple times with him at 1.3-1.35 BAR and and he would consistently put 2-3 lengths on me by 150 or so. In my 996TT, I needed to be at 1.4 BAR to stay with him at this level.

One of my primary goals with my GT2 when I sent it to TPC was to be able to keep up with him on 100 octane on the street! I'm currently running 1.6 BAR on 100 octane and after many hours of datalogging and fine-tuning, have determined that this is the optimal street setup for my car. No pulled timing, no touching the knock sensors, lambda consistently in the .78-.80 range.

Anyway, on our way home from a get together in Mexico tonight, we finally lined up: me at 1.6 BAR, Peter at 1.35 BAR. We went on 3 honks both starting in 3rd gear and he immediately got a car length jump (his car hits very hard in the mid-range). However, by the time I was in 4th at around 6k rpm, I was nose to nose with him. After we shifted into the bottom of 5th, I was maybe a half-car ahead. My turbos keep pulling up top, while his sort of stay level. They don't drop off, but they don't continue to pull like mine do way up top (6.8k-7.2k). The fact that my car is around 175 lbs lighter helps as well.

Neither of us spun. It was about as clean a run as you can get.

I'm not exactly sure how much power I make on 100 at this exact boost (I haven't dyno'd on anything but 93), but on 93 at 1.52 BAR, I made 712 rwhp/595rwtq. So, based on that I'm guessing somewhere in the 730-750 range on 100 at 1.6??

We plan on getting some 60-130s this week to compare, but I think by the way our run went that he will have the faster times in that mph range. But, I guess this is evidence that sometimes 60-130 only tells part of the story.

Down the road, we'll put in some race gas and go full boost (I'll go to 1.8 BAR, he'll go to 1.5) and we'll see what happens. I'm betting he'll get me, but either way I'm very thrilled with my car's performance considering my relatively minimal setup (as is he).

Just wanted to share...

 

Very impressive, nicely done Scott!

 

How does Peter's build up compare to your old 996tt?

 

nice and congrats but next time PLEASE take a video camera with you!

 

I'm looking forward to part 2..

 

Scott,

Considering that Peters' car is a full build, top to bottom (w/ Mckenzie heads, drool) and your car has only a bottom end build, why are you able to run more boost?

Also, tell me a bit more about your turbos.

 

The primary differences are that my old build was still a 3.6 with ported/polished stock heads, while Peter's car is a 3.8 with superior flowing McKenzie heads. He also has different cam profiles. He made 914 at 1.55 BAR on Todd's dyno, and my old car made 889 at 1.6 BAR on the same dyno. His peak torque comes on around 200 rpm sooner than my old car as well.

Mine was a budget build (relatively speaking). His is the mack-daddy.

 

My car doesn't even have a full bottom-end build. I have rods. That's it.

Peter's car flows so much air that he's maxing out the injectors at 900rwhp/1.5 BAR. He can run with cars running a lot more boost at only 1.3-1.5 BAR. Todd has tried to convince him to swap to larger injectors, re-tune, and put down well over 1,000rwhp...but he's simply not concerned with it. With larger injectors, he could easily run more boost...just like Rob, Art, EVOMS, etc...but he's content with what he has.

See if you can drag the details out of Markski. I'm betting you can't, but feel free to try.

This isn't all about power, of course. He makes more power than me at 1.35 BAR, that's for sure. However, GT2s are lighter overall and have less rotating mass (even though I'm running 19" HREs), which, as you know, all combines to make them very quick relative to the power they're making.

 

Right....Todds philosophy on injectors has changed (from maxing out smaller to using larger). My car definitely benefited from bigger injectors.

 

Scott,did you have your Vbox in the car while racing?any case of extracting some 100-200km times?

 

Really, how did it benefit? You don't make close to enough power to max out 60lbrs, which is what I'm running.

 

No P-box in the cars. It was an impromptu run. We'll get P-box times this week.

 

Dr J .... Todd's philosophy really hasn't changed. What has changed is the spray pattern of larger injectors. This change has allowed the larger injector to better idle and retain good upper end characteristics.

Like the 996tt engine as whole, injectors have become better. In the early days injectors had to be overdriven to obtain the desired power output. In reality, you really don't want to use more than 80% of their capacity.

 

I am only going by my butt dyno and what Todd and Akram have told me. They were adamant about my car benefiting from 83 pounders.

My car isn't even running right now (problem w/ my exhaust) but when the weather gets colder I will have some data.

 

Good info-history Scott,but we love to see some vids of those two monsters builds racing