Join Date: Apr 2009
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Took the car on its longest drive yet - 40 mile round trip to Orlando for a Wed night Lexus/Supra meet. Driveability tuning is still going well, car drives nice except: Found that on cold starts my J&S picks up on forged piston slap and clutch rattle, then retards spark to the point where the engine stalls easily until fully warmed up. I'll have to think about a way to deal with this - otherwise just live with it.
I've tuned boosted operation to 15psi and feels good, will keep it there until some more break-in happens.
I'm looking at using a coolant temp output from the Haltech to operate an analog switch that inhibits the knock sensors' inputs to the J&S until the pistons get some heat in them. Piston slap audibly disappears (along with J&S knock indication going away) soon after coolant temp reaches its operating point of 200 degrees or so.
I knew there would be some tradeoffs in cold operation with the forged pistons, and rough cold running makes my noisy-ass clutch rattle more (which also makes false knock indications), sort of a vicious cycle. All is good when warmed up though, so the anticipated tradeoff of "rudeness" for robustness is worth it to me. And I'm confident I can improve this condition somewhat with electronics and tuning.
After all, these cars tend to be R&D projects, right?
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