it is a loud whine, almost like a roots type blower. i am hoping for around 440 to 450 rwhp and tq numbers around 360 to 370. what i most wanted to achive on this project is higher boost in the lower rpm range and i feel i have accomplished this. the z pulls alot harder at lower rpm's. i am making 6lbs of boost by 3800 rpm.

 

I was thinking of doing the Si-trim but with my setup i would prolly have to reduce the rpm limiter between 6600-6800 or less depending on what psi we would see during tuning,and also eliminate overspining the blower.
But i would wait till i need new bearings and seals and have it done all at once.

 

Have you done any logging of your boost ? was wondering when you hit top boost and the belt starts to slip ?

 

no i have not. i have just been having my buddy in the passenger seat call out the boost numbers as i watch my rpm's rise in a straight line accelaration run. for the belt slip question, i have not noticed any up to 14psi@6600 rpm.i have not reved my engine past 6600 due to the lack of the new tune on the Si-trim.there has been no belt slip due to not seeing any evidence of powdery belt material on the underside of the hood,on the supercharger or s/c mounting plate. boost holds steady every time.

 

edit-- added 14psi @6400 rpm graph. 200 rpms lower than Jet Mech we just need to compare exhaust mods since he's at higher altitude. Gear differences (3rd vs 4th seem to make some PSI differences)

i just toook my Si out for its maiden spin. seeing 13.1 psi @ 5900 rpms (by that point i was FAAAR exceeding the posed speed limit). no feeling of belt slip and the logs look like they are steadily rising. if the boost kept rising in the same slope to redline, it would be ~17psi.

definitely need Jeremy to look at some of my logs as it seems fairly lean for the boost levels and i'm seeing 1 and 2 counts of knock (athough not in this run).

 

What pulley setup are you running? That is alot of boost!!! My goal with the si trim would be increased mids while maintaining only 11-12 psi of boost at redline? I would be willing to drop my rev limiter to 6600 -6800 if needed. I hear alot of people say that 400 hp is a safe power level so I would want to stay close to that power. I'm heading to performance factory around March 6th and need to make a final decision.

 

i'd let Jeremy make that decision as to which pulley as he will be the one tuning it. That's why people pay him the big bucks

 

the people who say 400whp is a safe number are the turbo guys who make around 400 tq and 400whp. A vortech that makes 400whp will make around 320 tq. IMO it's the tq number that's the important number to watch, not the hp

IMO the vortech is a different animal altogether and you could make 340 tq and 430whp safely...maybe even a little more

 

I added a 14psi graph above. i wish i could get on a dyno tomorrow. the stock internals might not last too long.

 

on the intake side i am running the mrev-2 lower with the 5/16 spacer. exhaust side is stillen headers, 2.5" aps test pipes, 2.5" aps dual exhaust, altitude in vegas is 2100 feet above sea level. im on a rev-up engine as well. boost appears to be pretty consistant with my findings. and for the altitude i am at the 200rpm difference seems about right depending on your exhaust setup. i am running 100 octane for insurance against detonation. i will post my dyno results once i get the z back from GTM. hopefully the engine will stay together! if not then i have the excuse i needed to start my stout engine build..........

 

i havent seen any knock on real pulls, only on like hit the gas and back off stuff.

i'm running non-revup, no spacer, smaller Injen dual SES exhaust and smaller Helix test pipe (smaller diameter). So that there would make me see higher psi. Do those test APS pipe mount up to stock manifolds?

Either way, cant wait for dyno #'s hopefully set some top 5 #'s

 

yes they will mount up to the stock manifolds. and bye the way i forgot to add that i also have stillen headers...........good luck on your dyno tuning session.

 

one thing to also consider with boost numbers on a rev-up versus a non rev-up engine is that the rev-up has cam phasing on the intake and exhaust side as well as the cams are alittle more aggresive on the revup from the factory ( i was told they are almost equal to the nismo cams). i think the revup engine naturally flows better out of the box.

 

like i said before, i think we may really be onto something here for the 350z vortech community!

 

You can say that again. I am anxiously awaiting your tune/dyno. I already spoke to Sam about the Si trim and it is definitely something that I will be switching to in the future along with a few other goodies.

 

ya i just need to find out when JT gets back from Australia. He was pretty frustrated with my car !st time around with the boost leak and whatnot. I think this time he will be happy to have his name associated with the tune, and maybe i can get a PF.com sticker for my side window

 

Looks like the SI trim is matching up really well with the QV motor . Rev-up or non Rev-up . Its reaching the belt slip area right at or just before redline . Should see some good results from it .

 

is that your experience that you start to see belt slip at 14+ psi?

i'd love to get jeremy to look at my logs before i tried a redline 3rd gear pull, so i'm going to wait til then to see if i stilpull more boost or start to slip.

 

Hey Paul, care going to be back in time for MM on 2/8?

 

i should be picking the z up on the 8th from GTM as long as everything goes well with the tune.