2004.5 350z....
Mods...
3.33pulley
Strup headers,
APS test pipes,
JIC Single exhaust,
Motordyne 5/16 Basic spacer.

Well basically car dynoed only 318RWHP Uncorrected and SAE was 306.49....Dyno pulls were done in 4th gear and I am using stock Split second tune and nothing else....Whats weird is i hit only 4.07PSI and it pretty much was flat line from 5K RPM and up to rev limiter...I am still using the stock belt provided with the kit and I am going to install the napa belt along with 3.12...Anyone believe this is a belt issue i am having?? Also anyone willing to send me a copy of the R4 software?? I had to redo my computer and I lost the program and i want to up the fuel once i add the 3.12 pulley.

Video-Car is running rich 1st run.... hence the grey smoke...
http://www.youtube.com/watch?v=o-ixMKtWdX4

Chart SAE corrected...

 

Ohh BTW i dunno if this dyno reads low or what not but a Stage 4 stillen had somewhere around 290whp and an APS turbo 350z only pushed out 345 at 8.5spi....

 

No, that dyno doesnt read low at all.. Its in your setup.. Sry.. Next time have them try 5 gear as that is the 1:1 in the 350z.. See if there is any difference..

Also, you need a better tuning solution IMO..

 

i bet your belt is slipping...

 

yep, looks suspiciously like the dyno i had, tuner got out of the car, got under, few turns and back on the dyno, magically i got 60whp back. lol

 

Wow... Hopefully it is belt slip..

 

The SS box is fine for the power the stock kit puts out . His problem is the boost level . 4psi isnt going to get you more than you did . Your belt slipping or you have a leak somewhere .

 

That boost curve looks like belt slip to me, too. Try tightening it slightly.

 

Same thing happened to me... belt slipping. Jeremy fixed me right up!

 

change over to the 3.12 pulley and retune it, it should look like this...

 

Ive logged boost after a tight belt will not hold any more . But never a loose belt . That boost graph looks pretty smooth and I guess that may be because of the smoothing from the Dyno ???? WHat I've logged was more up/down up/down .