Well, it's finally done... We installed Stillen's stage 4 supercharger upgrades to my car about a week ago, and I just have to say I'm very happy with the results.
First off, We installed the stage 3 supercharger kit nearly a month and a half ago. The car ran well with the stage 3, the power was on tap right away, which was very nice. But it flattened out in the top end, the common symptom of this style of supercharger vs a vortech style unit.
Stage 4 on the other hand offers a much more linier power curve, and seems to pull very hard all the way into the 6000rpm area.
Stage 4 upgrades involve changing the stock fuel pump out to a walbro 255, replacing the 7th injector that comes with the supercharger to a RC 750cc, a new pulley for more boost (7.5psi on my boost gauge), and new fuel/timing controller for the added injector.
The car really pulls strong, and reading air-fuel, runs a bit on the rich side, which is safe to say, better than being lean...

Also, I still get 25 miles a gallon on my way to work under normal cruising conditions, without really getting too heavy of a foot to and from work. Although it is a lot of highway miles...

A few things i noticed about this install:
1)you have to modifiy the fuel pump cage that the OEM pump sits in, because the walbro is bigger.
2)You may want to look into getting a smaller or shorter belt, because the stage 4 doesn't offer one. When installing the new pulley, you'll have to tighten up that tensioner a bit more, and it will push the belt close to itself. I have no issues, just a concern really
3)There is an adapter block, made from machined aluminum, that spaces the fuel rail that the 7th injector sits in, and it needed to be shaved down nearly 1/4 of an inch. This is something Stillen says was a one-time mistake, and is corrected now.

All-in-all, a few hour job, and excellent results! I'm very happy...
I highly recomend this to anyone with a stillen SC kit. It really makes the car drive like a FI car, and I would say really makes the whole setup comparible to a greddy TT on nominal boost. IMO

 

Did you dyno, what kind of numbers will the stage 4 give

 

You going to dyno this setup soon?

 

Good review (but needs some dyno sheets), but I really find that last statement hard to believe.

 

sounds sweet....!!!! i am glad to hear that you are happy with your set up... need some dyno .....

 

I'll take it to the dyno when I have some free time, No time with work and all right now. Stillen says i think 25hp extra, which I can believe, but it's all about how linear the car feels now, and how much power is being made throughout the rpm range that is nice.

Again, dynos later, i know you all want dynos....

 

Congrats on the install Tony!

Sounds like fun. You'll have to give me a ride in it some time.

 

I want one, I want to see that dyno first. pm me after and lets set up an install. Tony with the stillen G

 

subscribing

 

I'm not sure when i'll be free to do a dyno, with work it's real hectic trying to get it done etc...

Tony, come by, or PM me, i'll meet you out in the Riverside area one of these days, snag some sushi and give ya a ride to see for yourself, you'll love it! It's like a new drug lol

 

i'm on board......... getting one next weel....! can't wait........!

 

Right on Tony. Sounds like a plan.

One of these days (after I do all the NA mods) I will start making mods for the FI kits out there. ...And I may just have to get a FI kit for experimental purposes.

 

Well hurry up and get all of the NA mods out of the way then .

Congrats on the new setup Tony! Subscribing for dyno sheets. Some video would be nice too, just because I love the sound of the Stillen.

 

Wow, subscribing

 

subscribing as well...

 

Tony invest in extra pulley belts as they are common to snap....

 

we usually keep at least one set of the belts here in stock, just incase
But so far, on my car, no squeal, no bad belts.... My techs keep a good eye out on the car too when they work on it

 

congrats!

You should come out to Irwindale one of these Thursdays to try it out at the track

 

BTW I turned in my notice at Boeing because Motordyne is now doing well enough to be self sustaining. Now I am going to have a lot more time for R&D, meets, GTG's and track days! Woo Hoo!!!

 

Wow! Congrats man! Thats huge.