dan0617 wrote:
That thing sounds badass. Can't wait to see your track times!

How cold of plugs do you run? And what AFR on the wideband do you run when spraying, or do you just go with plug readings when spraying?

My problem was finding plugs cold enough to not melt down when spraying a 250 shot, but hot enough to not carbon foul when driving all day at light load part throttle on the highway. Also that a wideband reading of 11.5 or 11.7 works for an out of the box 125 or 150 shot, but is too lean on a motor that is getting well over 1/3 of it's power from the spray.

I've found that Autolite AR3933's are working great for me. AR3932's carbon up, and AR3934's blister a little on a 250 shot. Have to keep the tune a little on the lean side at part throttle to keep the plugs new looking, then on the rich side on nitrous for safety. On the wideband it is reading high 9's and low 10's, but the plugs look great after a nitrous run.

I thought the wideband was not reading right on the spray but I found a calculator on a nitrous forum that you basically need to figure how much power is from motor and how much is from spray, then figure your motor power at 12.7:1 afr and your spray power at 6:1 afr. Mine works out to low 10's, which is right where I need to be for good looking plugs.

I now believe the wideband is right but the target afr does need calculated this way because when it is calibrated it is done in fresh air, not a mix of fresh air and nitrous. Works for me, I was just wondering if you have a wideband and what it reads when you are spraying the 200.

Also, how is the part throttle light load cruise driveability and street manners when the converter is locked? That is alot of cam, heads, and intake for sure, but you do have alot of cubes to eat it up.