A word of caution ...

Upgrading the Vortech Impeller Upgrade to SI trim and then combining it with the Stillen 9 lb pulley can give you too much boost for a stock 11:1 motor.

Thats what I did ... it produced 11.9 lbs of boost @ 6900 RPM ... 483 whp : 378 tq.

The motor didn't hold together very long ... blew on the first 1/4 mile pass.

Am now in the process of having the long block built ... an expen$$ive le$$on

not upgrading the impeller, it's too expensive here in Aus for the gains. Maybe down the track when I change to E85, might be an option to do at the same time.

Thanks for the heads up though, appreciate it.

btw Z&I, when the motor is built, are you going to take it even further with the kit or just run it as you had it when your motor died?

What about nitrous? Anybody run nitrous with this kit yet? How does it perform with it?

Hey man just so you know I did the Stillen SC kit with my friend in his driveway and the only thing that we did wrong was we didn't realize that the supercharger came filled with oil and the manual only had one little line saying how it came filled. So we put the bottle of oil that came with the kit into the supercharger because the dip stick read empty but it wasn't and it caused over fill spray onto the strut brace and on the bottom of the hood. Also I got the 9lb pulley and it actually got me up to 10 lbs of boost

Seriously, how the hell are you guys seeing so much boost? I have the 9lb pulley and im only seeing 7.2psi boost and we have zero boost leaks...

Hey same here man I make about 7 or 8 no leaks!

Are all boost readers equal?

What AFR were you tuned for? I'm assuming pretty aggressive and close to 12.0. What was the temp at the track during the run? What octane gas used?

When the temps heat up or heatsoak, detonation plus the location of the MAF sensors = no good.

Either run higher octane than when you dyno'd to prevent detonation or keep it out of WOT during hot conditions.

Stock block sure BOOM . You can't even run the impeller and pulleys on the stock block too much PSI

There were probably a few factors involved causing my motor to grenade.

AFR target was tuned for 14.7 as per Vortech specs ... AFR guage showed more towards 14.4 at idle ...
Track temp was 55 degrees ... car was tuned on and for 93 octane.
MAF sensors were upgraded but still in the same location as the initial Stillen install.
Wasn't able to get a clear answer as to the MAF sensor tube size (uh-oh) ... was experiencing some cold start hiccups and some throttle hunting attributed to the 1000 lph injectors, but was assured the car was good to go and these were only 'minor' glitches and would be tweaked out.

Too late now ... not happy, but planned to do the internals next year when the wallet recovered.

The motor is now at Import Parts Pro (Kyle Puckett)
Kyle is extremely pleasant, super helpful, and a 1/4 mile racer himself.

Planning on taking advantage of the premature re-build to eek out some more performance.

Hopefully will get to get'r back to the track this fall ...

How much boost were you getting before the 9 lb pulley ???

Will be taking advantage of the unplanned re-build for sure ...
The motor is now at Import Parts Pro in Texas (Kyle Puckett)
Have had some very informative and pleasant conversations & emails with him.
Going with their Stage 2 Long Block and the 9:1 Wiseco pistons ... will probably max out the Vortech V3 with the upgraded impeller for now.
Might need to upgrade to the V7 later.
Most supporting work is done - just waiting on the motor.

Didn't realize they built motors. they doing the install too?

aaarrrggghhh ... you did tell me so !!! :tiphat:
I did try to express my concerns about the 9 lb pulley ...