it was coming out of somewhere else it was all over the place down to the brakes and wheels.

 

I see. Glad everything worked out for you in the end!

 

Hey Cliff, glad the car feels great and you are back up and running.

As far as the boost his boost was right on top of the boost from the other charger...

I dont really think the ART pipes made much of a difference in the power and tourque category. Also with the DE motors when you rev them to 7k with the vortechs power seems to flatten out up top, due to the fact that power and torque typically drops off so hard on the DE's that with the vortechs they just seem to flatten out. Unlike the the Rev Up motors where they continually make power all the way till 7200...

 

interesting, i guess i'm used to my built engine that revs to the moon and continues to build.

The harsh drop right together just looked strange. I guess not though.

 

I dunno, it just looks so abrupt.

This my dyno on a stock engine. It starts to run out of breath on top but it's not as abrupt as the OP's.


Plus, if you compare both our dyno's....his was clearly on the verge of overpowering mine by a good amount ( he has about 20whp more than I do by 6K rpm ) yet after 6K he only has 5whp more than me. Heck, at 4500rpm he's got about 50wtrq more than I do....ouch.

 

looks like belt slip >6k to me on the 2nd graph (the OP). Heck it might not even be due to a loose belt, could have been the bearings going out given that the OP blew them shortly after..

 

The internal bearings in a supercharger going bad can cause belt slip? How is that possible? Aren't the pulleys driving the belts which drive the blower (and it's internal components), not the other way around?

And the 2nd graph that that has the sharp drop after 6k is after his blower was rebuilt..

 

yea....maybe the belt did slip a lil bit that last run now that i look at it....his numbers were close and everything looked good so we didnt do any tuning the second time around we just wanted to make sure everything looked good. Cliff wants to do the GTM mod and maybe a 2.87...

cliff will be back and we will get him all hooked up next time he rolls through!!!

 

I am doing the GTM pulley mod for sure just not sure on the 2.87 just yet Im a little worried about over spinning the blower.

 

With the 2.87 revving at 7K you'd only be overspinning the blower by a small amount...I've been doing it for months and my bearing still sound fine on my USED blower.

 

Using vortech's website i get impeller speed of 57860.63 and the sc is rated to 53000rpm thanks for the encouragement though. I just lost some faith in the blower it self because I had a bad one. I wont send it back to vortech if this one goes there just to slow 928 motorsports would get a call.

 

i had 2.87 pulley and spun the engine to 8k. Blower sounds smooth as silk with no issues.

You have to realize, you aren't running the engine hours on end at the rpms over what they call max. If you do 1 pull straight to redline your impeller will see rpms above recommended for less than a 1/10th of a second.

and remember, their ratings are always on the safe side so they don't have to worry about warrantying anything. Most things have a "max safe" set a good deal below what it can do.

 

I figured that Im a very aggressive driver when I go out and play it would be more than 1 pull. I see 10 psi now at 7ki when I shift and I wouldnt mind another 1-2 psi.

Im looking for a good set of rear tires to put the power down tell i buy my new set of rims. I was all over the place at the track on sunday the best I could do was 12.7 at 114
with a 2.0 60.