Preparation for the STILLEN supercharger

RCZ

Eventually when I get bored and have some extra loot laying around to rebuild the engine I'll give you an exact number hahaha.

Im pretty sure this blower is already in its efficiency zone even with the Stillen CARB kit. Remember guys that the CARB kit is already up 140whp up on their baseline (420-280=140whp) per Stillen's preliminary dyno numbers. Its not like they aren't making good use of the blower, its just that it has a good bit more room to stretch out it's legs after that.

1slow370

honsetly the kit is going to be about damn near maxed when you buy it from either company. a general rule of thumb for car with a drivetrain as sturdy as ours is to limit it by the psi no the horsepower. an 8 psi turbo kit and an 8psi supercharger kit place equal strain on the block. superchargers make less power because it requires hp to turn the supercharger either way 8psi of air with the same ignition advance is going to generate the same cylinder pressures. right now the highest i would take the stock motor is in the 7-10 range depending on how ballsy you are.

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stormcrow

I feel that 450 to the wheel would be a "safe" number. I say this in quotes because, again, there is no real way to know. There are just far too many variables given that each engine is different. Every VQ37VHR (or any VQ for that matter...or any motor, truly) will react differently to the same stimuli. Your motor may have better tolerances than mine (as an example) and take the same power longer. Or it may be that you have a weak rod or bearing from the factory and the motor lets loose much more quickly. You just never know. But, for a calculated risk, I want no more than 450 to the wheel.

As far as 91 vs 93, there will be a significant difference in the ability to quell detonation. But, boost isn't the main factor when trying to keep detonation from being an issue...timing is more important. Also, keep in mind that more boost does not always equate more power. It depends on the efficiency range of the compressor used and what the IATs might be. IATs are very important in useful power and keeping detonation at bay. Most times, more boost = higher IATs.

RCZ

I think we could get away with 10 psi on a good 93oct tune. As far as being maxed out, I don't think the Stillen kit is near maxed out. As I understand it, they have enough room on that compressor to go well beyond the limit of our internals.

Anyone know what the max psi is for that blower?

LiquidZ

22 psi for Si trim.

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RCZ

^ well then, we can blow up our motor twice over with it then lol.

370Zsteve

And that's the point where you went on ignore. Have a great life, Mario.

edit: first time I've used the feature, this thread's size just got halved, rofl.

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SOLD MY Z MARCH 2018 - another Core OG moves on - new ride 2019 Z Corvette Grand Sport - no mods necessary but already have eyes on HFC and intakes LOL IT NEVER ENDS.

370Zsteve

Woof, 10 psi, I can only imagine the excitement inside the cabin at full throttle

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SOLD MY Z MARCH 2018 - another Core OG moves on - new ride 2019 Z Corvette Grand Sport - no mods necessary but already have eyes on HFC and intakes LOL IT NEVER ENDS.

RCZ

Stillen: Question.

Are the tunes for 91oct? Are we going to have an option for 93oct for those of us who get decent gasoline?

Zsteve

I miss the 93 Oct, I can really feel some loss of power coming here to TX, with the high alt and going from 93 to 91 oct.

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2010 LS3 C6 Silver coupe corvette

Kyle@STILLEN

Figuring out the proper efficiency "range" of a Vortech supercharger takes a few things:

1) Volume of air you're trying to move
2) RPM that you're spinning the supercharger
3) Size of the engine you're trying to feed.

Basically, there might be a "sweet spot" of efficiency on the compressor map for the 370Z but it's going to be very different for an engine like a Charger SRT-8 however you can still use the same blower for each application.

One of the great things about the Vortech V3 supercharger is that it is a very efficient blower at over 70% efficiency.

Kyle@STILLEN

I don't have an exact answer for that yet but it has definitely been a topic around here.

Our biggest issue is that there is nowhere for us to get 93 octane fuel. We were talking yesterday about possible locations and the closest place we can think of is Oklahoma...We're currently looking into it though.

Kyle@STILLEN

I forgot to add this in my last post.

This chart shows some different forced induction systems on the VQ35 engines. You can see how the STILLEN roots blower was the best down low, but at high RPM was lacking.

Attached Files

Supercharger Dyno Comparison Graph.pdf (479.5 KB, 32 views)

Buddy Revell

Definitely good to see how the entire hp curves compare and not just the peak numbers. It'll be very useful to compare the final dynos from the two kits when they are eventually available. Thanks for the info.

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'08 IP G37S/GTM Supercharger/20" DPE SP-5 Wheels/ARK GRIP Exhaust

MMC Racing

I don't think this has been asked - what PSI is that dyno at?