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

I've got a stillen supercharger kit on my Z was wondering if anyone has ever modified a car with this kit? I also have a stillen exhaust which I don't necessarily like. Any ideas for mods?

I'm a car noob, but yeah i got the stillen supercharger for my Z as well. Along with the stillen catback exhaust, oil cooler, and headers.

With the stillen tune, my car made like 330whp (stock was at 270whp) which was ****** up since i spent like $10000++ on it, but after a custom tune on a dyno it made 390whp. So yeah, I guess what you need is a good tune.

Also,

my car dude told me that it can make more power if I get the stillen cats as well, along with the SC. Do any of u guys know how much more HP will it make if I get these cats?

Sorry if Im making this thread my own, but i guess i have a similar question with you

I dont remember the members name, but look around for his Stillen Supercharger thread. He purchased his kit from another member that switched to a different company. He made a couple mods to it and was making over 400+ whp. I will look around and if I find it I will link it, but im not going to spend hours finding it for you =)

Found it click here -------> http://www.the370z.com/forced-induct...ercharged.html

only took 16 min! good job

As geohartanto mentioned already a custom tune is paramount in getting the proper power out of this kit. If you want over 400whp Stillen can sell you a 9psi pulley, you can also purchase the 928 motorsports impeller to upgrade the stock vortech impeller which will make more boost throughout the rpm range and increase peak boost by 1psi. Any upgrades you do will require another re-tune regardless.

That would be me I purchased the kit from Weiboy.

For anybody that is trying to get more power out of this kit a custom tune is a must.There are a few ways that you can go to get more power out of the kit.

You can get the 9 psi pulley from stillen this will require you to sign a waver.
Also you can get the 928 motorsports impeller this will increase boost throughout the rpm range.

If you want more power than that you can do what I did and put cog pulleys on the back of the supercharger , and back of the bracket.By having Cog pulleys on the back will allow the boost to come on sooner ,and prevent belt slippage for the supercharger. Fair warning do the cog pulley mod at your own risk I am still doing R &D on it.
Doing the Cog pulley modification will max out the stock maf's at around 7000 rpms. You will need a bigger intake or upgraded maf sensor's.

This kit has a good Vortech unit that is nowhere near is maximum potential. Does it have it's flaws yes it sure does.

Once summer hits get ready for major throttle lag.

Are you talking about me or other people in this thread?

My experience with the stillen kit on my car last summer

I understand piss poor 91 plus a bad tune will do that to you.

Might want to ask RCZ what he did, cause he is making 430-440whp out of the same kit you have.

stillen 9psi pulley and a custom dyno tune

Is this reliable power with no knock? Those are not bad numbers. I would like to see more guys getting there easy.

Theres no knock, its just as reliable as all other FI kits out there, just as GTM is doing now with their larger rotorex blower and 10psi. The stillen kit uses a vortech V3 and its capable of far more power. With a few tweaks it's capable of making the same numbers as the unreleased GTM stage 2 SC, as squeeze has shown.

People aren't making much with the 8psi pulley because the tune stillen provides is extremely conservative to try to meet carb approval and to hold up their warranty they offer ($400 fee gets you 3 year/36,000 miles or up to $8,000).

Haha actually only took like two minutes. I started reading other threads and forgot about this for a little bit. =D

I got 387 WHP out of my kit at over 5000 ft altitude (Denver area) running 7.2 PSI with a conservative custom tune. I had to use the 9 PSI pulley to get the 7.2 PSI at our altitude. Here is my review.

http://www.the370z.com/forced-induct...tall-g37s.html

Ummm I'm making 455whp at 9psi with a custom tune. Otherwise its an out of the box Stillen supercharger kit. If anyone has any doubts, my car trapped 121MPH last night at the track. For comparison, the 2012 GT-R does a quarter mile run in 11.0@122mph.

OP, don't listen to all the people in here talking trash to sell GTM products. Notice how they have no real suggestions to help you, they just want to criticize the stillen kit and bring you down.

I am planning on getting the 928 Motorsports impeller soon. I think it will add a lot of midrange torque and some high end power with the increased volume. I wouldn't be surprised if PSI went up due to the flow. Probably bump me up to 470whp.

That's a great trap speed. What was your actual time?

jnaut was driving and his best time was a 12.2 with a 2.0 60' from what I heard, the car just isn't setup for 1/4 mile and he couldn't put the power down.

470whp would be great for a sc at this point in the game! Also I think meth injection might pull in some additional power.

http://a2.sphotos.ak.fbcdn.net/hphot..._8097196_n.jpg

i saw the 370z that Vinny Ten Racing installed the stillen and made 450whp tuned.... some decent #'s are coming out.

The stillen sc is no joke with a custome tune and a few supporting mods. Exhaust, down pipes and a 9psi pulley. I was very impressed :)

Anyone know of a good shop around tampa that can do a tune?

^ Most florida people are getting the install done by jnaut and the tuning done by Jack at HPLogic.

With your mods adding the 928 Motorsports impeller should get you 470whp without a problem. It is designed to increase boost I think your psi will go up the 9 pulley from Stillen is small. I have to measure it the pulley is smaller than 2.87 inch Vortech pulley. If I had to take a guess I would say its 2.75 in size.

I am curious to see the graph of your car with the impeller.Because the pulleys that are on the back of the bracket and supercharger slow it down because there so big.

:tup:This is also a great idea there is untapped potential on the table for sure.

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

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

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?

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.

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.

RCZ is right. I have no complaints from my kit and my review speaks for itself. I just wish I lived closer to sea level! I am hoping to be able to replace my 9PSI pulley and get up to 8 PSI of boost at altitude. I am currently trying to determine what RPM the blower is turning with the 9PSI pulley to see how close I am to the 52K upper limit. That 928 motorsports impeller also looks promising but would cost a bit more than a pulley swap.

There is no way for you to know how close your are to the limit of the unit without having cog pulleys.In order to find out how fast you are spinning the blower you have to put in the crank pulley size plus the supercharger cog pulley and jack shaft cog pulley ,and use the impeller speed calculator on Vortech web site..This is the one of the reason's I made the switch to a cog set up.With the 928 motorsports impeller you can spin to 60k up from 53k.

Even with doing all of that there is still some belt slippage that you can not account for from the serpentine belt on the front.

Drag slicks? I imagine those would help cut that 60' time down to 1.6 or so, which would help the overall E/T. Making that power the car should be in 11's for sure.

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.

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.

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.

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.

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