upgrade a-trim to s-trim

[Guitarguy]

i get mixed answers on this so i thought i would ask here. anyone ever modify an a-trim vortech to an s-trim???

[LPDesRoche]

Originally Posted by Guitarguy

i get mixed answers on this so i thought i would ask here. anyone ever modify an a-trim vortech to an s-trim???

It's a completely different blower, you can't modify an A into an S. You can just swap the headunits and be just fine though. The S or the T will work fine on an L98 or LT1.

[Guitarguy]

yes it can be done. here is my old a-trim impeller



here is my new 928 motorsport s/sc type impeller



here is the inside of the scroll that was cut by Supercharger Rebuild


here it is together


it sounds great, have not road tested it yet.

[Guitarguy]

ok got to drive it today. put 30mi out of the 50mi they say to breakin the new bearings. in the old a-trim form i would see 6-7psi @ 5500rpm. today i saw 5psi @ 3500rpm & 6psi @ 4000rpm. a little more cruising and then i'll see what max boost is. but what a difference down low in the rpms.

[Guitarguy]

took it to 5k rpm saw 8psi, glanced over ay my wb afr guage to see 12.8 quickly let off of it. time for injectors and a tune, ill be calling mr. blowerworks soon.

[AKS Racing]

Now imagine 12 psi (sometimes 14 when it is cold) at 3000 RPM.

[Guitarguy]

Originally Posted by AKS Racing

Now imagine 12 psi (sometimes 14 when it is cold) at 3000 RPM.

WOW i bet that is hard to keep from spinning at any speed. sounds like fun.