Currently installing the SoS return fuel system, 10psi CT 1200 kit. Using the SoS large heat exchanger. Is another few psi safe on 91 with the current air/water setup? The KW kits are doing almost 15psi but with a FMIC.

 

With the large heat exchanger yes should be no problem. The AIT should be very comparible between the two kits. Water resist heating up better, but takes a little longer to cool down once it does, that the difference between the two set ups. Rotrex blowers run a little hotter then a Paxton also.

 

For reference, my KW kit with a C38-91 blower showed just over 120 F IAT on an 85 F day on track. I am running about 13.5 psi on 91 octane.

 

I'm curious about the SOS return fuel system. Is there really a benefit to it? and how much does it usually cost to install it?