Dear Wady,

I am using a Fogger NOS system on a stack injection unit of Kinsler's on top of a 605 cid big block Chevy. We are running on alcohol for the motor, but inject gasoline VP's C-23 on the nitrous side. My question to you is, could we enact the high speed lean-out on the alcohol side of the motor without burning off a couple of pistons when it kicks in?

I have both styles of lean-outs - a "pop off can" and a "diaphragm" type. Ever since we went to running the nitrous, I disable the lean-out, but now I'm wondering if there might be still more in this combination that I haven't discovered yet.

I've been told that the pop off can style of lean-out won't reset itself after the shift out of first to second, creating an extra-lean condition in second gear. I could install a timed pinch valve in front of the lean-out, if this is the case, so that the high speed wouldn't be enacted until the pressure rose for the second time farther down the track after the shift was made.

You're supposed to tune the motor so it makes the maximum amount of power first, and then add the nitrous to your combination for an added thrill. I would appreciate your input on this subject. Thank you.

Andrew

Dear Andrew,

I would definitely go with a timed pinch valve setup and, yes, the idea is to get your engine dialed into its max on alky and the tune the nitrous system for the added power gains. As I am sure the fuel pressure builds somewhat on the run and the engine does get richer on the alky side, the pinch valve theory should work very well.

I would, however, be very careful on how much bypass until you find the "happy" spot.

Pro Mod Wad

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