RPM data log not smooth? - need Ideas

4GTuner

Help Support 4GTuner:

just a thought, can you disable your boost controller and do a run?

simply use spring pressure on your gate.
advise on rpm log after please.
 
i can get my map up at the moment as my lap top with the data on it crashed, from memory Im not running that much timing though
 
I have discovered my problem well the rpm one anyway
checked out the runout thing I had with the harmonic
looks like the crank is either bent or the bearings are shot ... it is not spinning central
it is making loops if you get my drift.

So it is a new crank or at the very least a full set of main bearings.
My oil pressure is good though so not sure what is going on there but something is screwy ?

Know where I can get another 4g64 7bolt crank?
 
Go a forged crank Troy. With the amount of power and torque you're going to give it I'll be worried about the crank cracking at number 4 journal.
Do it right first time ;)
 
yeah but i'm worried that the old crank walk will just screw the forged crank
have done some reading up on that too.

Going to change bearings first and see if it holds the crank centre and straight (I can do those in car too)
if it still wobbles around it would indicate it is bent. I'll will still pop it in a lathe and put a dial on it just for shits and giggles when it gets replaced.
 

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