December Fastrack is out!

[Tristan Smith]

I guess I won't know for sure until I build a full blown engine. But even 220whp seems optimistic.

[tnord]

i was under the impression these cars made BIG gains with IT legal prep?

my 1990 had 222 stock hp;

222 * 1.3 = 289 * .82 = 236 - 237 whp.
222 * 1.3 * 11.25 = 3247

222 * 1.25 = 278 * .82 = 227 - 228 whp.
222 * 1.25 * 11.25 = 3121

yes, 18% driveline loss is used for RWD cars.

[lateapex911]

RWD cars have a 90 degree turn in the driveline that FWD cars do not, so the WHP is different. If you're going to do the math to back out the components, use 18% for driveline on RWD, 15% for FWD.

[erlrich]

So the 300ZX was classed using 30% for the HP increase? Interesting....

[JoshS]

So the 300ZX was classed using 30% for the HP increase? Interesting....

It appears to me (I wasn't involved, so I don't know for sure) that only about 1/3 of the ITR listings were done with 25%. Most are at 30%. There are some at 20% and 15% too.

[Ron Earp]

RE the 300zx - my cursory research showed that 200-210 rwhp might be hard to get BUT all that data I turned up was from the guys on Z boards who want to bolt stuff on and are strangers to the "every little IT mod is important and eventually adds up to big numbers". Didn't find anyone who had done the 0.5 compression, rings, hours on header design, etc. that it takes to make serious IT power.

In fact, the same Z guys laughed and called me a liar when I posted plots of our ITS Z's making 165-175+ rear wheel hp using stock cams and stock carbs. Go figure.

I bet a 300zx in 100% IT trim will be close to 225-235 rwhp.

[JeffYoung]

Caveat -- I have an ITR 300ZX sitting in a storage shed.

What I know: the impression the motor makes big gains comes from a single dyno sheet on a car (my car I believe) from when it ran in SSA with a cat back exhaust. Supposedly made 225whp.

Like Tristan, I've not seen anything close to that in the research I've done, but the only way to find out is build an IT motor and see.

My guess is 225 whp in IT trim.