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Microtech Highway tuning my LT8

Old 03-03-09, 05:35 PM
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Highway tuning my LT8

So i took my car to the freeway this morning around 4am. Started my boost around 9psi with current maps, everything was fine. I then tuned to 14psi with wideband reading 11-11.5 accross the rpm's pulled crazy. Anyhow after releasing my foot off the gas on WOT letting it idle, the rpm just shot down till the engine turned off. I than turn it back on with no problems. But everytime i WOT the engine dies after i let the throttle go? what do you guys think it is? TPS is calibrated, maps looks good with no error messages. Could it be timing?
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Old 03-04-09, 01:29 AM
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you using the decel fuel cut feature? you could also be slightly lean on your low RPM/idle map in the 10-15" range.
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Old 03-04-09, 06:35 AM
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The idle map may be lean.
If the decel cut feature is on switch it off.

ANd what spark plugs are you using?
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Old 03-04-09, 02:49 PM
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well i tried on WOT again last night @18psi damn its heaven on this side of boost. For some reason this time it did not shut off on me. I increased my idle map only by 2+ points. The plugs i am using are the colder ngk's 10=Leads and 11-Trails.
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Old 03-04-09, 06:05 PM
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The plugs are your problem?

Are they b10egv and b11egv?

Get R7420 10.5

PM RICE RACING on ausrotary.com or RX_HEAVEN_WA on here. Both can help you out.

The fact that you bumped up your idle and it helped, means your idle was too lean to begin with.
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Old 03-04-09, 08:14 PM
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The plugs i have is the one that starts with R746?? not b10 or 11's. This was never a problem before using these same plugs until i retuned my upper boost tuning. I did also notice that on a stand still playing with the throttle, i can make my exhaust backfire at around 2500k-3k. I must have adjusted something on the LT8 for this "Flu" to start affecting these little issue's. But the upside the car pulls and runs great. I am going back to the drawing board and check to see what i did different.
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Old 03-05-09, 01:24 AM
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the backfiring is from a lean 25-30" range idle map if your TPS is adjusted properly, i'm guessing you somehow leaned out most of your idle maps while playing with the idle settings.
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