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Cutting Out When Shifting At Full Throttle

R33ram

By R33ram,
in General Maintenance

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R33ram Enthusiast

R33ram

Posted
Posted (edited)

hey guys,

just abit of help on why when i put my foot down full throttle it goes great in any gear but between gear changes like from from (first to second gear) it goes from say shifting at 5500/5800 and cuts out like for 1 sec to 4900rpm and picks up again...Does it most times and when it doesnt just wheelspins like crazy...Ive got new coil packs YJ and ive tryed the spark plug gap thought it might be jumping the spark and that but nothing....only does it through shifting gears at full throttle and hardly cuts out at all when just putting ya foot down in any gear..

thought might be afm but its just through gear changes.

any ideas.....

Edited by R33ram
scotty nm35 Grand Master

scotty nm35

Posted
Posted

What intake are you using? It sounds like the bov return might be facing the wrong way causing air to flow back up towards the afm. The bov return needs to face the turbo compressor wheel.

R33ram Enthusiast

R33ram

Posted
  • Author
Posted

im using a greddy copy face foward plenum and bov is the vulture motorsport ones and from the throttle body side its plum back all the to the turbo intake which is a 3inch metal pipe intake to turbo...

it is very far to the turbo the bov.....

R33ram Enthusiast

R33ram

Posted
  • Author
Posted

Just tested it again with no gear changes just flat out full throttle right through the rev range and perfect and then tryed it 1st through to 3rd and just cut out throught the gear changes like a jerk type and then bang goes again but every gear change was making a sound like back fire type like pooof and dropped revs and went again...sound was coming through the pod and it wasnt the bov sound or turbo flutter...

scotty nm35 Grand Master

scotty nm35

Posted
Posted

It needs to dump towards the turbo, neither of those pipes do. If any returned air flows back up the pipe past the afm it will cause the problem you are having.

Where are you located? Surely there is a fabricator close by that can angle the return a little? Or take it back to the shop that made it?

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Here is a pic of the intake I make, the bov enters on a much tighter angle pointing towards the compressor of the turbo. Yours can work if you angle the fitting a little.

Drop in if you like and I can explain it better, I'm only in Hampton Park. :)

post-63525-0-82722500-1343221676_thumb.jpg

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