my question is for those who have upgraded to the purple impeller is..
1.Has anyone recorded HP gain on a dyno as compared to the stock impeller?
2.if it is a 1-2lbs increase on a 302 what does it do for a 355ci engine?
Printable View
my question is for those who have upgraded to the purple impeller is..
1.Has anyone recorded HP gain on a dyno as compared to the stock impeller?
2.if it is a 1-2lbs increase on a 302 what does it do for a 355ci engine?
CUND Racing on Ebay advertises 2-3 PSI boost increase. I am assuming they are claiming it is on a 5.0 engine.
When my dad upgraded to the HO impeller on his '85 Corvette (350 cu-in) the claim was 1-1.5 PSI increase of boost. So around there. Of course these are all claims.
I can tell you by the seat-of-the-pants dyno on both '85 Corvette and 5.0 Mustang the boost comes on a little earlier and much stronger at the lower RPMs.
On my 454 ci it was a 1 psi rais of boost.
came out to a 1.5 lbs increase at about 5500 rpms
1.5 psi increase isn't bad at all, especially considering the cost of the H.O. impeller. You've gotta be pretty happy with that, no?Quote:
Originally Posted by 415ss69
im happy the boost seems to come in alot quicker
Time to head back out to the track?
i got 10lb of boost out of my sn89 fresh rebuilt with hi-output impeller. very impressed.
You guys measure the boost in the intake and not just behind the supercharger right?
These are 2 different numbers.
i get my boost reading off a 'tee' from my power brake booster hose
i got just shy of 1.5# on my inline 6 bmw with boost coming on earlier