What pulley combo for a Whipple??

[HONDASAKI]

What pulley combo should I run for a Whipple 2.3L to make 18-20*? I am putting it together and currently have a stock lower and a 3.25 upper. Thanks

 

[mrose75]

That's my combo as well. Is it a first gen or later gen Whipple? What kind of fuel are you running? I have 2nd gen with 91 octane here. Unfortunately I still have to install everything before I can run anything, LOL.

 

[94slowbra1]

On my gen 1 I have a 3.25 Upper and 4 lb lower, 21psi. So I'd say a 3.5 upper and 4 lb lower or 3.25 upper and 2 lb lower. That would put you on the high side of you goals

 

[HONDASAKI]

Thanks for the info. Ordered a 4lb lower.

 

[delly]

94slobra1 what kind of numbers are you putting down? And how does the convertible handle it? Thx.

 

[delly]

Sry just read your other post.

 

[c6zhombre]

I see you already ordered....but you can make those boost numbers with just an upper and retain the safety of the factory caged lower....I have a gen2 2.3 whipple and run 3.0" RR pulley and see 17psi and a 2.6" RR pulley and see 22psi. I bet a 2.8" upper would be perfect for around 19-20

 

[HONDASAKI]

I wanted to change just the upper, but needed to get something toady, so found a 4lb lower not too far from me.