If you map is tuned correctly you should not need a retune. When I did the dyno comparison of the stock SC and the 928 impeller it was done on the exact same map with no tuning. The 928 impeller will put more area under the curve but it doesn't change it to a turbo powerband or something odd that would require some cell modification.

If your map is tuned as in a linear manner that meets the requirements of running an SC trim you should be able to run a 928M impeller and it will just go through different cells. You raise your fuel pressure a small amount for safety if necessary but I didn't have any problems with how mine was tuned.

 

Just to update, I sent the blower off to Vortech for what turned out to be bearing and gear replacement, and I got it back and finally got a chance to install it:

http://www.youtube.com/watch?v=8G1kKtekoZA

That's what the blower should sound like....

Here's an extra bonus video of the tune...set volume up for full effect:

http://www.youtube.com/watch?v=e2xFLOJMnI8

 

Nice, how does it feel?

 

Pretty good...boost definitely comes up faster, and with the meth, we got quite a bit more power out of her....but my tuner is definitely concerned about the power on a daily driver stock block...I was pushing about 13.5 psi around 6800 rpm....

Chef, I think it's time you put you meth back on....

 

We'll see later about M/W so, upgrade blower and added meth from before?

Can you show us before and after dyno sheet? Still runing uprev reflash? (if you have dyno shows A/F graph, that would be great)

Thanks

 

Fu*King awesome. Sounds like a jet taking off.