Whipple Versus PSI

Hypothetical question.............

If a person had a given engine, and ran it with a PSI-C, and then ran it with a Whipple A980 (axial), would there really be that much of a difference at the end of it all?

 

Not sure what your asking but the whipple displaces more than the PSI, so you would have to spin the psi harder to make the same air. I’m thinking when they were both “legal” the whipple was somewhere in the 58% overdrive and the PSI was 125%?

 

Thanks Rob. Here is kind of what I am wondering........

Both superchargers will have their own mechanical speed limitations tied to them, and certain rotor efficiencies versus speed as well. This is totally apart from any class limit rules considerations.

So in a pure Outlaw class, if a person ran a PSI-C at 228% could a Whipple A980 keep up with or even exceed the performance potential of the PSI-C at 228% ?

I guess I would also ask whether anyone knows the weight difference between a PSI-C and a A980?

 

That Whipple moves about 25-26% more air per revolution. One would have to see the Efficiency graphs to determine if theirs a cross over.

 

30#s heavier with the same options, blower bag, belt guard and pulley--Jim in TN

 

And the main difference is COST now----

 

I thought there were ways to still do that??? Or am I wrong?

 

I think they had to go to Sweden for Re-Cert.....or maybe I am thinking of something else

 

Bob Newberry was authorized by Whipple to cert. the blowers for a while but then Whipple called it quitts

 

Last time I talked to whipple they said there was a place down the street from them that could recert them. I don’t have a good back to back comparison we run the A980 and it is in my opinion comparable to a c rotor. we run out A at 90 over. We also have a 15 year old engine comb with veney heads and don’t turn over 9400 rpm we have compared boost numbers with guys running a c rotor on a modern engine and we are close they out perform us up top but are running more rpm. For the cost difference the A works great and will overcome the 30 lb extra weight. I will say not all A980s are created equal !!! We have had 2 and the one we have now is better than the previous one !!!

 

Thanks Drew.

Yeah the compressor flow of the C is quite curve linear upward according to Norm (RIP), with RPM, so that explains the top end difference. C's are much like A980's, not all are built alike.

Have a Merry Christmas, and a Happy Holiday to you and yours.

Be Safe.

 

Same overdrive?

 

Mike we helped him a little with info I don’t remember what his boost numbers were. watching the videos seemed like he couldn’t get a handle on it down low. I don’t think his boost numbers were as good as ours and the rules of the event are definitely a factor we run the mid west drag racing series where they try to keep everyone right around 3.70 et. I don’t know if we can go 3.59 like Halsey did we have been 3.69 and feel there is a few hundredths left in it but I think our blower is better than the one he had.