Thanks all for the compliments and replies!! For those of you following the saga of this cars build, it certainly has come a long way from the near stock condition I bought it. Just some additional information I forgot to add. The numbers were done at 16 psi of boost and the car is now close to 150,000 miles on the odom (although the engine was sleeved, built etc about 10,000 miles ago).
wow crazy TQ, how the hell are you getting that much TQ? that just doesnt make sense ?
The running theory on the crazy torque numbers is that my piping is too small and too restrictive (just as Tinker said). Back when I started the build my target number was around 400-450 whp. But as you all know the pull of the "go-fast" crack pipe was too strong to resist and I had to upsize the turbo for more power. We ended up putting in a bigger turbo but we kept the piping the same which was streamlined for the smaller turbo. For example, I had put in the smaller diameter comptech headers instead of the larger diameter DC Sports headers. The smaller piping, streamline for the smaller turbo, is allowing me to really build up the power at low RPMs for the high torque, but it's also really choking off the power on the high end. I think it also partially explains the very unique exhaust sound the car gives. Although physically similar to the other Factor X turbo NSX's it sounds unique to them. If we were to free up some of the restrictions I think I would see much higher HP numbers, so in reality I think without the restrictions the HP would be closer to 650 whp with the same torque 573 ft-lbs, which seems like a more reasonable ratio. However, having said that, even still the torque numbers seem abnormally high. The weird thing is this car ALWAYS had high torque numbers, on several different dynos and in several different stages of the build. Back when I was only pushing 400 whp, I was still at 405 ft-lbs of torque. When I was at 450 whp I had like 440 ft-lbs. Even the some of other Factor X turbo cars that are doing in excess of 650 whp don't seem to have these kind of torque numbers. I have no idea or rationale why the torque is so high.
Anybody have any ideas or explaination? I hope maybe some of the other builders out there have some theories?
Vegas - Why was the motor only spun to ~6400rpm?
I think there were a couple of runs run out all the way to 8K, but it was more of the same: The torque stayed flat and the HP dropped off drastically. The run just had the best numbers of the day.
Is your car just a tire shredder with that torque? Are you able to put it to the pavement? Very impressive numbers and probably close to the point of limited returns on a street car. My experience has shown that power over 550 has little effect on the 0-100 mph range that most street cars live in. I would love to hear any tips for improving traction in this power range. Congrats again!
With my older Bridgestone S03's (275 wide) the tires were pretty much useless. It felt like they were just constantly spinning in the first 3 gears. Since this isn't my daily driver and I'm blessed to live in a city where the average annual rainfall is probably less than an inch, I switched to the wider but smaller diameter all black Volks (10.5" wide, 18" wheels) and Toyo RA1s (305 wide). WOW, what a difference. Once the tires are warmed up they stick like glue and I don't have that much problem putting most of the power to the ground. One little oddity is that in first gear, I can't get up to full boost (only 9 psi) because the turbo is so big and the gearing is so small. However, this is great because it doesn't overwhelm the tires and keeps me from just spinning the tires. No more getting blown away by crappy civics from a dig. :biggrin:
I agree that I think for a street driven car, I'm near the max of performance returns. Also I'm worried about the limits of the tranny and other components, which historically with the other Factor X cars have shown premature failure at power levels slightly higher than mine. I think from a performance standpoint I'm close to done. Next up: WIDEBODY :biggrin:
