VTEC Racer -

Am I correct in assuming that you have now ironed out the remaining issues with Vortech?

 

Jenner, on average, the Dynapack reads 10 hp higher. On some cars even less. We dyno'd Team Hybrid's car back to back on my dyno and a dynojet and the difference was only 6 hp. My car, which I use a barometer since it hasn't been modded in a long time, reads 10-11 hp higher than what it read tested on 2 different dynojets. Interestingly though, torque numbers aren't off by much, only a couple lbs-ft. We also have done a lot of correlation testing recently with some modded RSX's. Again, 10 hp differentials.

By my eye it looks like you're at about 190 hp at 6k rpm. Have you checked your A/F ratio? A leaner mixture can make more power, but at the expense of reliability. Remember too that we tuned this car. It was only making 284 (or about 274 on a dynojet) before we tuned it up. VTEC Racer's car may also have a different setup (exhaust, flywheel, etc.).

Oh, and the VAFC settings we identified on the Dynapack will also show well on a Dynojet - for this car. Every car should be tuned individually because every car is different. But, the settings we identify on the Dynapack are almost always optimum when testing and attempting to retune the same car on a dynojet (we've tried it).

UL

[QUOTE]Originally posted by Jenner
[B]Those are not dynojet numbers right? What is the % difference that you figure UL?

 

[QUOTE]Originally posted by ultimate lurker
[B]By my eye it looks like you're at about 190 hp at 6k rpm.

 

perhaps the midrange has to do with VTEC. We tried lowering the VTEC point, but it lost power at anything below 5900 rpm. I know some people have been able to lower VTEC significantly.

You'll have to ask VTEC Racer for his settings on the car.

UL

 

UL,

I just realized something. I drove the car for 9 days with the supercharger on before I got it tuned by you. I never tightened the belt before we tuned it. I tightened it now and it had a decent amount of slack. Once it stops loosening, I'll be sure to set up another appointment so we can tune it some more with the belt at it's right tightness. Hopefully I'll have a throttle body by then too.

Da Hapa,

Yes, I have no more issues with the kit, knock on wood.

 

If you were making 7.5 PSI on the dyno then your belt wasn't slipping. That's about normal.

MG

PS - oh yeah I'm still wondering about the FMU's effect on leanness. The fuel pressure increases with boost but the engine gets much leaner at the VTEC switchover, then gets richer as it goes up to redline. It's almost like you need a variable rate FMU to deal with the VTEC dynamics - in lieu of a tunable ECU.

 

What is the proper A/F ratio for the Vortech SC? When is it too lean and affects reliability?

 

Was the "as delivered" tuning with VAFC installed but no VAFC corrections? Or had somebody already attempted to adjust the VAFC either on another dyno or by guessing?

I guess I'm curious as to how the Vortech will perform, especially at altitude (5-8K ft) without a VAFC.

 

VAFC installed, but no tuning.

UL

 

You should add "...with a V-AFC" when you say that. Mainly because your statement is true of a MAP tricking method of fuel tuning, but not other methods...or, it has not been proven yet for the other methods.