JLT Intake tune for GT350

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lightning
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Joined: Fri Mar 16, 2007 9:01 am

JLT Intake tune for GT350

Post by lightning »

Looking for guidance for GT350 JLT intake tune. Fuel trims are 29% and adding 30% to trinity stock tune modifier only changes it by 9%. Looking for MAF transfer or someone that knows the magic amount to add. Thanks
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06MonteSS
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Re: JLT Intake tune for GT350

Post by 06MonteSS »

Wow, you've got big air leak issues man.. You need to check the air intake, headers/exhaust manifolds, and exhaust system itself.. not good... shouldn't be that lean at all...

check the air intake, make sure it's all fully connected/together, and that all clamps/bolts from air filter to throttle body are all TIGHT so no air leaks anywhere...

check the headers/exhaust manifolds and re-tighten all bolts, make sure all TIGHT so no air leaks.. make sure no cracked manifolds, gaskets all good...

check headers/exhaust manifolds connections to exhaust and the whole exhaust system itself, make sure all bolts/clamps are TIGHT so no air leaks anywhere...

Make sure all breather hoses and vacuum lines are all connected where they should be... make sure no cracked/split hoses...

Check around the intake manifold, make sure no air leaks around the intake manifold...

then, after everything is fixed and tightened up, you need to check a new steady driving log.....
06MonteSS / DiabLew Tune
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mikel
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Re: JLT Intake tune for GT350

Post by mikel »

lightning wrote: Wed Jan 20, 2021 7:40 pm Looking for guidance for GT350 JLT intake tune. Fuel trims are 29% and adding 30% to trinity stock tune modifier only changes it by 9%. Looking for MAF transfer or someone that knows the magic amount to add. Thanks
Are you tuning this with CMR?
Mike Litsch
Holley Technical Sales Manager
Diablo Tech support by phone:
561-908-0040x4
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lightning
Posts: 102
Joined: Fri Mar 16, 2007 9:01 am

Re: JLT Intake tune for GT350

Post by lightning »

Yes, Long tube headers as well.
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mikel
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Re: JLT Intake tune for GT350

Post by mikel »

lightning wrote: Thu Jan 21, 2021 11:06 am Yes, Long tube headers as well.
Id start with JLT to see if they can provide a known curve for the CAI/MAF combo.
Mike Litsch
Holley Technical Sales Manager
Diablo Tech support by phone:
561-908-0040x4
M-F 8:00 AM to 5:00 PM EST
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