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Originally Posted by Tyler Townsley
... If I were to race a ZR-1 the first thing I would address is the radiator bypass and how it functions. In stock configuration this system starts routing water around the radiator at 5200 rpm and by 5800 you have almost no water being cooled unless you slow the revs back down, leaning the motor only increases the likelyhood of blowing a head gasket in this situation. The fix is simple but does call for a heavy duty radiator and cutting the thermostat pressure spring and blocking the bypass.
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Interesting. Thanks for that bit of advice.
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It is obvious you are comfortable with data monitoring so there is no reason to fly blind. Take the laptop and record a session then look at temps and rpms then look at the AFRs from your WB O2 to see just what fueling is doing throughout the run. What happened to spark? As previously stated the computer will pull timing out and you will never notice without going back over the data. Oh yeah start the session with enough fuel so you will have at least 1/4 tank at the end of the session. The dual pumps suck a lot of fuel and it does not take much to lean out the motor when a turn or stop pulls fuel away from the pickup.
Tyler
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Last year I datalogged a number of runs at the track. That led me to re-curve spark avoiding the knock retard. Trap speed went from 111 to 115mph.
The most recent changes I made were based on datalogs from my dyno runs a few weeks before. Having done some plug cuts, I began to suspect that the WB used at the dyno may have been reading lean although the dyno charts showed a pretty
steady 12.8 - 12.9 AFR up thru 7000rpm.
Hoping to go to track one last time this weekend. Back to your point however, if I lean it out any more, I will be datalogging looking for any knock. I'll keep you posted.