Thread: car is breaking up a little at high rpm

on they dyno i noticed my car was breaking up around 5,000rpm

i'm assuming this is a grounding issue
maybe because i have my battery in the back?


what are some good spots and items that i should re-ground to see if there is any improvements


i have unlimeted acces to a dynojet
man i'm cool lol

Haha I wish I did!

Why are you assuming it is a ground issue? Have you ruled some stuff out already?

I would check over the basics you know like plugs and timing and what have you.. I'm sure you know haha.

Otherwise more obscure things might be clogged fuel filter or injectors. Start with all that garbage lol. Easy and won't take long to check.

Vacuum leaks also.

boosted or all motor ????

all motor stock ecu

new plugs, wires, cap/rotor
fuel filter
timing is good
there is only 1 vacuum line and it doesnt' leak lol

battery is in the back

how extent is the mods on the engine? do you have a afc contolling the fuel?

2.5" outlet header
full 2.5" exhaust
hks air filter
no a/c
emissions removed
timing at 17*

nothing for tuning at all

What kind of grounding do you have and at what points in the car?

Clogged or clogging cat?

there is no cat, and all the exhaust is straight through and new


the battery is grounded in the trunk to 2 different spots

ant engine is grounded from the stock motor location to the inner fender and the motor mount at the body

think i should add more grounds to the engine ?