4th gear breaking up only

Cobra8urZ06

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Here's my dilemma, 24psi its fine WOT 2 to 3 but as soon as it starts coming into boost in 4th it falls on its face and starts popping and farting, the cars probably making close to 900whp, i only run unleaded 110 in it and other than this issue it runs fine, i checked the plugs this morning they all look good and are gapped at .029-.030 i think i'm going to try a new set gapped at .025. Also the clutch in the car isn't rated for near the power i'm making, is it possible its slipping-grabbing causing this issue? almost like a wot chatter? ANy help would be great.
 

itSSlow98

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Whats your fuel system consist of, with the added load in 4th its definetly seeing the most stress in 4th. Also I would reccomend goign a step colder on the plugs to a BR7EF. Whats your wideband showing when it starts to break up?

BTW your clutch would slip if that was the problem.
 

Cobra8urZ06

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put br7s in it gapped at .022 and problem solved, the fuel system is a magnafuel 625 with 80lb injectors so it's definitely not out of fuel.
 

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