how to get more power out of a stillen supercharger kit?

KaienZ34

there is a good chance when i go FI, i'll send my Z to him also.

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karamountzos

I'd like to compare it with different exhausts. Hks. Amuse. Ark. Instead of the stillen. Sound and performance

christian370z

The Stillen kit has huge potential, especially with the extra head room for more power down the road with an impeller/pulley swap. Is there any way to quiet down the supercharger unit though?

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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob

Mr.Squeeze

The only way to quiet down the supercharger unit is to raise the idle to about 800-900.The unit will still have a slight whine though.To me the Stillen kit is very quiet compared other kits using the same vortech unit that vent to atmosphere.

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Driven Motorsports Single Turbo 7675 T4 1.32 A/R 995WHP 780TQ

docaam

I saw one guy here installed Stillen kit on a 5AT G37 coupe and tuned it via unichip i think he was pushing around 430-430whp on dynojet.

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Old 370Z SOLD but not forgotten
370Z 40th, G37s, S30 RBZ, Hakosuka Skyline

RCZ

I was told the V3 is good for 18psi on an otherwise stock z... I could be totally wrong with this guesstimate, but I guess its only an approximation. Assuming that you will lose a few psi with other high flowing supporting mods...lets call that 15-16psi on a VQ37...would it be fair to say that that is our ceiling for power on this supercharger?

The stock block is probably good for ~11PSI at the limit...

Not only does the 928 impeller produce more power at the same impeller speed...but it also has a higher ceiling as Mr. Squeeze described. I don't know if the top RPM of the SC is limited strictly by the impeller or not, but all in all, this SC + the 928 Motorsports impeller has the potential to go well into the 500whp range with some internals. Hell, it can probably be enough to push those upgraded internals to the limit too.

The other advantage is that you can get the same power with less wear and tear on the SC unit since it will be spinning slower than the stock impeller would be.

dal1307

Thats all true and the 928 Impeller is definitely a must to max ot the V3 but I am only wanting to get to a full 8PSI at altitude and use the 928 BLV set to 8 PSI to ensure that I stay at no more than 8 PSI even if I take the car to lower altitudes. I don't want to amp it up to the point that I worry about trashing the AT. Now if I had the MT, I would be tempted to explore the 10 PSI range but then you start getting into worrying about the engine internals.

BTW RCZ, the Vortech site lists the specs on the V3 in our kit as 53K RPM and 17 PSI max boost. Here is the link to their specs page:

V-3 SCi-Trim Supercharger | Vortech Superchargers

A quick, rough calculation gets you approximately 3117 RPM per PSI based on the 53k/17PSI max numbers. So that means the 9 PSI pulley should be turning somewhere around 28,058 RPM if you assume 100% efficiency. If you roughly factor in their peak efficiency of 75% listed in their specs then it should be turning around 35,073 RPM. Either way, there should still be a lot of headroom left and you get even more headroom using the 928 impeller.

By the way Mr. Squeeze, nice job on your build! Do you still have the slotted pulley off the SC itself? If so, could you measure it for me? I don't want to take the belt off mine just to make a measurement.

I don't know if I will actually make any changes as the car drives great and has good power but it is alwasys fun to explore the options.

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2008 G37s 5AT, Stillen SC, Stillen CBE, Stillen tranny cooler, DBA 5000 front/4000 rear, Stillen sways, Tein SS-P coilovers, SPC front & rear control arms, Goodridge lines

esfourteen

the impeller is a good choice as it should only make another 1psi more peak for you but would increase boost slightly throughout the rev range. You can get the impeller off ebay from 928 for about $30 cheaper then the website.

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Mr.Squeeze

The vortech sc bearings are ABEC 7 and are rated up to 59k

dal1307 I do not have the pulley anymore I damage it taking it off.Those pulleys had loctite,and was a pain to remove.

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Driven Motorsports Single Turbo 7675 T4 1.32 A/R 995WHP 780TQ

dal1307

No Problem, I will just have to take off the belt and measure it, just being lazy

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2008 G37s 5AT, Stillen SC, Stillen CBE, Stillen tranny cooler, DBA 5000 front/4000 rear, Stillen sways, Tein SS-P coilovers, SPC front & rear control arms, Goodridge lines

JB-370z

Wow, its got a nice set of bearing in there.

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ll Baker Tuning ll GTM ll Powerhouse Amuse ll HKS ll Up-Rev ll iForged ll AP Racing ll Pioneer ll SPL ll Bride ll Top Secret ll OS Giken ll
GTM Stage 2 Twin Turboed 370z (First in Texas, Thanks To Baker Tuning)

geohartanto

Hey Mr.Squeeze you seem to know alot about the supercharger. Im currently at 390whp.
1.) how much more power can we get with a 9 psi pulley?
2.) My auto guy said changing to stillen cats with another tune, we might get 30 or even 40whp?

thanks man!

Mr.Squeeze

What type of dyno did you get the 390WHP on was is a dyno jet?

If I had to take a guess I would say about 30 or so, I am not a 100% sure because I haven't used the pulley my self yet. My numbers are without using that pulley.

I also have never ran cats on any of my supercharger set up's I alway use test pipes.

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Driven Motorsports Single Turbo 7675 T4 1.32 A/R 995WHP 780TQ

ANMVQ

Nice numbers man, I'm getting my Stillen SC installed in the next week and the will be out to Kaizen for a tune.. Mustangs are good dynos IMO. True numbers.

Yes if you run HFC's or TPs you should see another 30 WHP.

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14 Q50 AWD, ARK, ECUTEK (SEB), Takda,

Neo187H

That's not true on our cars, with TPs he will actually prob see a loss of HP due to the valve overlap.