Stock Block
Vortech w/ 2.87 pulley
CJM stage 1 FR
Utec
660cc injectors
Borla Exhaust
Test Pipes
MD 3/8" plenum spacer

I started with a basline of 361 whp then got up to 400, this was on a dynojet so it seemed pretty low for the mods, I had the AF perfect at ~11.4:1. I stopped because I thought that my timing was getting awfully high (I was at 14.5 at the 100% load site at redline) I was experienceing absolutely no knock on 93 octane.

any advice? do you think I still have room for more timing advance, most people with the 2.87 are putting up alot higher numbers than that on a DJ

 

not sure what what numbers you are seeing but 400whp is about right with your mods and a 2.87 pulley. im getting around 370whp with my 3.12. i expect to hit about 400whp with a 2.87 pulley.

 

looks like you are getting a bit of a belt slip at 6200 rpms to redline...

 

i got the timrod fix and have the tensioner on pretttty tight, looks like i have to tighten it more.

what kind of timing are you guys running at max boost and redline?

 

I am still using the SS box and 3.12 pulley... I have no clue on my timing actually although I know it is fairly aggressive as I am running a mix of 91 and 101 oct gas.

I hit 380 rwhp on a dyno dynamics dyno which reads a bit low compared to a dynojet...

Looking at your plot from 6200 up it stays flat with a downward tendancy, this is where I think you might be slipping a bit.

I just got the GTM extra idler pulley and am going to install it tomorrow.

 

not sure if i got this right. U were on the 3.12 pulley before and on this dyno it was around 340 but once u put the 2.87 pulley on it jumped to 400? Is that correct? If so, that's 60hp increase so what are u complaining about? On average, ppl get only 30 hp increase from 3.12 pulley to 2.87. I would like to see what psi you are at and if it's slipping bc the timrod method is suppose to stop slippage.

 

Ok, I hope you dont mind, I played a bit... where I circled is where I think you can gain more power... I would tend to think slippage here....

I colored in where your power and TQ looks like where it should go... Kinda like my NVDA stock

 

no this is all 2.87, I went from 360 to 400 just messing with the timing

im hitting about 11.5 psi, not sure what the 2.87 is supposed to top out at

 

Is this on a 5AT or a 6MT?

was the 360 "before" tuned at all? As I said I am hitting 380 on a dyno dynamics on a 3.12 at 8.5psi and I am a 5AT... This on stock injectors and the SS box...

My main mods are in my sig....

I have RC 650's and a Utec waiting to go in as well as a Walbro... I am going to run the stock fuel rails.

11.5 sounds about right as far as your PSI... thats 3 more PSI than my 3.12 is giving me.

Once I get my 2.87 and Utec in I will let you know what I get out of it.



P.S. did you have to mill your 2.87 to get it to fit? Or did it just go on without any modification?

thanks.

 

11.5 psi is damn good. no belt issues there. i just think you were expecting too much from your vortech setup. dont mind the dyno queens who claim 400whp with 3.12's, thats just not realistic. if you really want mid 400's then go with a cam upgrade.

 

add cams and headers if you want more power - and/or a 34 tooth cog pulley

 

man thats exactly what i am hoping to make. thanks for posting your sheet.

 

sentry, you really think headers are worth it? cost of installation just turns me off on them.

 

mill down to fit 2.87??? It fits like every other pulley. Headers and cams make a big difference. With the 2.87 pulley i was making 430hp on my AT on DD dyno.

 

i can't say if any mod is worth the money or not, but headers and cams will add more power - so will water/meth injection, higher octane gas, and more timing

 

Great numbers !!! dont push the timing to much !

 

Nexx... Dyno queen huh? I made 395/325 with the 3.12 pulley, aam spacer, test pipes, full exhaust and a walbro. I ran 12.2@115 with that setup. So no dyno queen there bud.

 

i wouldnt be complaining if this was 400 hp on a dyno dynamics, but this was on a dynojet sae corrected with the smoothness on 5

and to answer the pulley question, no i didnt have to mill it it just needed to press it onto the jackshaft

 

I was reading this post by booger:

https://my350z.com/forum/forced-induction/85752-vortech-2-87-pulley-not-right.html


Here is a pic he posted of what happened when he installed the 2.87.








I just don't want to have these same issues as Booger did...

 

that might have been a freak incident, I ordered mine from summit racing and it worked fine