Well, I finally got the numbers in and I'm alittle disappointed. Is there anything wrong or just my bad luck? This was on 91 Octane in Ca on a dynojet. 354hp/300lb tq

Setup:
Vortech with 3.12 pulley (380cc injectors, inline pump, fmu)
Kinetix cats
Borla exhaust
MREV 2+ with 5/16 spacers
alpha werks headers
1 step colder plugs
Tuned with EU

Question:
One of the supplied grooved idler pulley from the vortech was bad and it didnt spine (i believe a bad bearing and is being ordered). My question is, will that affect the results? My tunner says it should not change the dyno # at all so I'm quite confuse on how everyone and their mother are able to get 370+ with the smaller pulley????

dyno:

 

Looks like there is a spike right after 4K (slip?) and then at 6K there is that "blip" that goes down and sideways a bit then continues up to redline...

I would ask what that spike is at 4K

That "blip" at 6k I had and have seen on many Vortech Dynos which should be able to be tuned out and smoothed out. If that can be tuned out then you should see an increase from 6K continuing up instead of heading sideways.

Good Luck.... The numbers are not bad at all... There could be other factors in play as well.... I was running 95 octane when I got my tune and dyno done on the dyno dynamics...

 

91 octane is pretty poor fual to use with a hi-comp FI setup. this all equals less power per psi due to less timing. Was the car tuned or is it rnning a basemap from votech?

 

AT5's are not going to make great hp . I was at 350whp [ Mustang dyno ] with the 3.12 pulley . Your A/F looks good and seems to be aobut as lean as you would want to take it . The dip at 6000rpm is from timing being pulled .

 

At this pt we are not sure what psi this was at bc he never checked and will have to get back to me. He did state that the belt was tight so I'm not sure if there was any slipping so I cant explain for the spikes at 4K and 6K rpm. This is fully tuned with the greddy EU. Tunner also stated that he saw as much as 380hp but it was knocking and had to pull timing and tuned it conservative up top.

 

That's wat I dont understand. The A/F ratio looks great but why am I getting low numbers when u were getting 350hp on a mustang dyno which reads less?

So having a pulley not spinning wont cause the lo dyno numbers?

The only conclusion I can think of is the heat. It was dyno in 97 degree weather

 

Was the timing map left alone ? Altered? Who tuned it ?

Dont understand what your asking about the pulley not turning

 

The timing was pulled.. he said something about 3 degrees???

1 of the pulleys on the vortech wasnt spinning so it was making a loud noise but got quieter as u left it running. He said the bearing was bad and it was making the noise and not making the pulley spine.

 

The pulley in blue is the one that wasn't spinning freely.

 

how do you dyno a 5AT anyway? who do you get the shifter to stay @ 4th?

 

it's the same way u dyno a MT but we dyno in 3rd.

 

i thought it was 4th?? and how do you leave it in such a high gear at aa slow rpm? doesn't it shift for you?

 

Was the belt touching the pulley? If it was, I am surprised that the belt didn't start to smoke from the heat generated by the friction of the belt running over a pulley that was not turning. The fact that the guy actually ran the motor like that would send me running and screaming in the other direction.

 

Never heard of JDM2 Performance. They may not know the software well enough. Seems like you're low on power with the mods that you have.

 

We just made 370 WHP/300 TQ on the 287 motor in a '04 Z auto on the DYNAPACKS. Tuned on UTEC/550cc with easy ignition timing. That was through DC headers, aftermarket cats, Apexi N1 exhaust. The car has a AAM plenum spacer and AAM return fuel solution.

There was more power to be made at the cost of more aggressive ign. timing/leaner AFR's. AFR's were solid mid to low 11's. Nice smooth linear power graph. I'll try to post it up later.

So, your numbers seem O.K. to me.

 

I believe the belt was still touching against the pulley, that is why it was making a lot of noise and eventually it quieted down a little but still noticable. At first I thought my blower went out but he explained it was a bad bearing and it stopped the pulley from spinning. So wouldnt the friction of the pulley cause the belt is slow down a bit? I still dont know what the psi level was at and I'm hoping that is the reason for the low hp/tq.



I'm in Fresno, CA so not many FI g35/350z rooming around but there are a few. And as for the tunning, the A/F ratio is quite smooth and I dont think not knowing the software was an issue.