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Breaking up in boost

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Old Jun 30, 2018 | 10:48 PM
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Default Breaking up in boost
turbo 4.8 on 16 pounds ran flawlessly broke the trans and swapped from a 4l60 to a th400 now its has a misfire at 7 lbs have already replaced plugs, they're gapped at .024 only thing that has changed is the transmission and stall speed went from 3500 to 3200 have changed the crank sensor and was able to hit 11 lbs once

https://youtu.be/n4-pw-vyseU
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Last edited by Kecrew; Jun 30, 2018 at 11:00 PM.
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Old Jun 30, 2018 | 11:09 PM
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From: Stockbridge GA
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Originally Posted by Kecrew
turbo 4.8 on 16 pounds ran flawlessly broke the trans and swapped from a 4l60 to a th400 now its has a misfire at 7 lbs have already replaced plugs, they're gapped at .024 only thing that has changed is the transmission and stall speed went from 3500 to 3200 have changed the crank sensor and was able to hit 11 lbs once

https://youtu.be/n4-pw-vyseU
Did you over rev the engine when the original trans broke? Could be a valve spring issue.
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Old Jun 30, 2018 | 11:14 PM
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Originally Posted by gametech
Did you over rev the engine when the original trans broke? Could be a valve spring issue.
no I didn't it was driving fine when I came to a stop wouldn't pull anymore was shooting all the fluid out of the vent stall was destroyed as well
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Old Jun 30, 2018 | 11:23 PM
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Originally Posted by Kecrew

no I didn't it was driving fine when I came to a stop wouldn't pull anymore was shooting all the fluid out of the vent stall was destroyed as well
I'm guessing you had downtime between transmissions. Any wires get rodent chewed?
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Old Jun 30, 2018 | 11:26 PM
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Originally Posted by gametech
I'm guessing you had downtime between transmissions. Any wires get rodent chewed?
2 weeks checked all the harness don't see any issues
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Old Jul 1, 2018 | 12:54 AM
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Originally Posted by Kecrew

2 weeks checked all the harness don't see any issues
Out of ideas for now. Sorry.
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Old Jul 1, 2018 | 06:58 AM
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No wires between the bell housing?
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Old Jul 1, 2018 | 07:42 AM
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Plug wires, coils? Might not be related to the trans at all and just happened to occur at the same time.
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Old Jul 1, 2018 | 09:44 AM
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Originally Posted by jimmyg
No wires between the bell housing?
no sir have checked it
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Old Jul 1, 2018 | 09:45 AM
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Originally Posted by chiaj144
Plug wires, coils? Might not be related to the trans at all and just happened to occur at the same time.
checked all of that out just hard to think what could've happened to cause this all of a sudden
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Old Jul 1, 2018 | 09:56 AM
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What ecu?
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Old Jul 1, 2018 | 10:45 AM
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Originally Posted by 3 window
What ecu?
fitech ultimate ls
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Old Jul 1, 2018 | 06:16 PM
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My buddy’s got a fitech set up on his sbc. He has had a few issues with it. I would give them a call.
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Old Jul 1, 2018 | 07:49 PM
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What plugs? Converter could be loading it differently.
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