[tjf37]

Alright guys... first, here is a current mod list:
2.3” upper
TSP 2” catless headers
Flex fuel (e85)
Low side pump
Triple heat exchanger
K&N carbon intake

Looking at making some changes.

I have a 15% lower pulley with balancer in a box. I was told I would potentially run out of fuel if I were to install it.
I am looking to throw a whipple on, with a 3.5 upper and the 15% lower. What boost would I be looking at? Will I potentially run out of fuel again with this set up? Would a cam (+33% lobe) be necessary if I don’t want to run meth or e54/91? Just trying to figure out my limits and what would be best for me.

Thanks!

[RDBill]

I have a Whipple with a 3.5 upper and 15% lower. You will run out of fuel without a cam and probably an additional low side fuel system. I make roughly 20#'s of boost. But what cam you use, intake, exhaust all effects boost levels. Boost is essentially a measure of restriction

[danhr]

Your low side will tap out before the high side, so you will need some sort of low side assistance (upgraded/multiple pumps or aux pump) but almost immediately after that, the stock lobe taps out.