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09-30-2020, 09:12 AM
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#1 |
 Drives: 11 Camaro SS, Ninja 1000, Santa Fe Join Date: Sep 2020
Location: Dallas
Posts: 49
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Turbo backfire and upcoming tune
I have a tuning appointment this Saturday. One of the items I am looking to address is a high-boost (12 psi) backfire between 1-2 gear on my 6L90 transmission. I have read 2 very distinct thoughts around this. One involves the park being blown out in the plugs and another regarding a rev limiter hitting a cap and stalling between gears until RPM's come back down creating the backfire.
Are there any other specific points I should bring to the tuner this weekend regarding this particular issue? Thank you all... |
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09-30-2020, 10:29 AM
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#2 |
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Served USN - Atomic Chimp
Drives: 13 Camaro LSX434 TT M6, 21 ZLE A10 Join Date: Jul 2012
Location: Fort Collins, CO
Posts: 1,603
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Possible you're hitting the rev limiter and it cuts spark. The unburnt fuel heads into the exhaust and ignites (loud pop).
With turbos, when hitting boost, the revs scream up quickly so it's easier to hit the limiter than before boost. Some adjustments can be made to avoid hitting the limiter.
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 In excess of 1,000WHP LSX434 | AGP 65/65 TT | BTR Equalizer Intake | Trickflow 245cc cathedral | BTR custom cam | Cortex EBC | n2mb WOT | ID-1700x | Brisk GR12S | RPM Lv 7 TR6060 | AGP's Triple 525LPH Fore Fuel | Monster LT1-S Triple | 4.11 DSS Proform 9", CF driveshaft, 1400hp axles | Hurst Line Lock | MGW Retro Short Throw w/old skool Hurst T-handle | ADM solid subframe mounts | Prothane Motor Mounts | Revshift Poly Trans insert | Moreno camber/caster plates |
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09-30-2020, 01:30 PM
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#3 |
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Drives: 11 Camaro SS, Ninja 1000, Santa Fe Join Date: Sep 2020
Location: Dallas
Posts: 49
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Thank you dreksnot. I intend to bring this up in the session to see what they find out as well in the mapping and the RPM limiter.
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10-11-2020, 09:31 PM
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#4 |
Drives: 2011 SS Join Date: May 2020
Location: Ontario
Posts: 25
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Update?
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10-12-2020, 03:20 PM
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#5 |
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Drives: 11 Camaro SS, Ninja 1000, Santa Fe Join Date: Sep 2020
Location: Dallas
Posts: 49
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The new plugs went in and no backfires since. It is thought to have been a poor tune. Time will tell.
The tune session went great. It pulled 814 with 12.4 psi of boost on the hub dyno. It could have pulled much more but the bottom end is all factory and I wanted a very conservative tune that will also allow a long life for the motor. https://fb.watch/14sMDCk_sQ/ Thank you for checking in and asking.
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11 Camaro TT SS. 14 1LE motor, full coilover, CNC ported LSA heads, stainless valves, dual springs, Comp 224 cam, Melling oil pump, AGP Garrett GTX30r's, 1400cc injectors, full 3" Magnaflow, dual Walbro 450lph fuel pump, ZL1 6L90 trans, trans cooler, Circle-D 3600, 3.91:1 Eaton Truetrac, line lock, Lingenfelter 2 step. Current boost - e85 814 RWHP.
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10-12-2020, 07:16 PM
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#6 |
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Drives: 2011 SS Join Date: May 2020
Location: Ontario
Posts: 25
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Nice, glad you got it sorted out
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