troubleshooting ideas?
 

my car has a mean ------- vibration at right around 3000 rpm.

shakes the fuckn doors off practically. car still runs fine just very bad vibration.

does it in nuetral as well as in gear. just around 2800-3200,

would this be a bad balance on the internals?? thats the only thing i can think of.


set-up:

boosted d16a6

rods, vitaras, cometic HG, 450cc dsm injectors, pr4 ecu chipped, t-bird turbo.


any ideas, if its an internal problem then its just gonna get left alone.

Re: troubleshooting ideas?
 

wheel bearins

Re: troubleshooting ideas?
 

Even in neutral ???

Re: troubleshooting ideas?
 

has it always done it since the build?

Re: troubleshooting ideas?
 

Is it a speed related issue? IE does it do this at say 60mph in third and in fifth? Sitting still? Is the vibration consistent every time or not? New or old axles?

Re: troubleshooting ideas?
 

not speed related, rpm related,

does it in neutral, dont believe it to be the axles or wheel bearings, transfers through all the controls i.e. pedals, steering wheel, shifter.

Re: troubleshooting ideas?
 

something weird like crank pulleyt or flywheel waay out of balance? drop them or something ?

Re: troubleshooting ideas?
 

i dont know what the ---- it is.

theory:

changed the alternator, shortly after this vibe starts. along with vibe is sqeuaking like a loose belt. just tightened the belt.

is it possible for an alternator to be out of balance??? its just a theory but ---- thats all i have.

cant isolate where the noise is coming from when i rev the engine.

Re: troubleshooting ideas?
 

Check and make sure your crank pulley bolt is tight. Ive seen dseries work the bolt loose and as such the pulley does the same. I highly doubt its your alternator. Its possible the belt tension that is on the alternator now has just brought this problem to light.

Re: troubleshooting ideas?
 

could that alternator be locked up? the motor is trying to turn that thing over and its not happenin so its squelin?

Re: troubleshooting ideas?
 

ok, seems the sound is coming from my mainfold/wastegate.

bad vibration and squealing like a belt thats loose. going to take the wastegate off tomorrow and see if anything is messed.

Re: troubleshooting ideas?
 

Ive seen flywheels out of balance before. Not common but have seen it. Did you replace or resurface flywheel with this build?

Re: troubleshooting ideas?
 

Loose axle connection? Do you have the car up on jacks with the front wheels off the ground? *reaching here*

Re: troubleshooting ideas?
 

do you have a flex pipe

not bad but i had a vibration around the same rpms before i put one in

Re: troubleshooting ideas?
 

Only out of balance flywheel I've seen pulsed the entire vehicle regardless of rpm.

Re: troubleshooting ideas?
 

Attachment 15919

and there is one of the problems, the other is on the number 2 runner.

gonna fix it soon, will be nice to have boost alittle sooner.

o yeah and header wrap sucks.

Re: troubleshooting ideas?
 

header wrap is great, shitty materials suck.

Re: troubleshooting ideas?
 

when i took that ---- off it was falling apart. and it didnt even control the heat that well.

i would rather pay and have ---- coated.


not this cheap ass mani but anything else.