Hello from Australia
I have been a member for ages but not active. Can't remember if I introduced myself before so hi again.
I have a Nissan patrol wagon with 2007 Duramax and built 2006 Allison 6 speed, Billet torque converter, 4" intake, 4" exhaust, edge display. Dsp5 running up to 570hp I think. Currently on 370hp setting.
When I bought the car (already converted) it had a very feint vibration/harshness around 1500 rpm which has gotten a lot worse lately.
Car shakes like a drag car and vibrates the whole car. Insane at 1500 rpm and worse on cold nights than during warm days. Not speed dependent, just rpm so my guess is engine or gearbox.
I have read a heap of threads but none seem to be the same symptoms as what I am experiencing.
Nobody in Australia knows much about these engines, so I need some help please?
It's a transfer vibration definitely but rather than just fix the symptom, I would rather fix the underlying problem.. Or at least know it's not going to cause a major failure at some stage.
Balance rates are all very good. Better than good actually. No codes on the edge display.
I read a few threads about cracked flex plates but they are described as a different sound. The sound is like a resonating vibration sound rather than a clunk, clank or clink, and seems to be coming from under the car, though I expect it can be transferring from anywhere.
I'm not a mechanic, but I'm also not a dummy so any ideas please fire them through and hopefully we can eliminate them one at a time?
I have been a member for ages but not active. Can't remember if I introduced myself before so hi again.
I have a Nissan patrol wagon with 2007 Duramax and built 2006 Allison 6 speed, Billet torque converter, 4" intake, 4" exhaust, edge display. Dsp5 running up to 570hp I think. Currently on 370hp setting.
When I bought the car (already converted) it had a very feint vibration/harshness around 1500 rpm which has gotten a lot worse lately.
Car shakes like a drag car and vibrates the whole car. Insane at 1500 rpm and worse on cold nights than during warm days. Not speed dependent, just rpm so my guess is engine or gearbox.
I have read a heap of threads but none seem to be the same symptoms as what I am experiencing.
Nobody in Australia knows much about these engines, so I need some help please?
It's a transfer vibration definitely but rather than just fix the symptom, I would rather fix the underlying problem.. Or at least know it's not going to cause a major failure at some stage.
Balance rates are all very good. Better than good actually. No codes on the edge display.
I read a few threads about cracked flex plates but they are described as a different sound. The sound is like a resonating vibration sound rather than a clunk, clank or clink, and seems to be coming from under the car, though I expect it can be transferring from anywhere.
I'm not a mechanic, but I'm also not a dummy so any ideas please fire them through and hopefully we can eliminate them one at a time?
