Dual disk resonance

[JSPulliam21]

I installed a Valair 3850 dual disk not too long ago, and have had a resonance at about 1600 rpm. It only happens when you are pushing it harder than normal acceleration. It is like a short high frequency vibration from 1600 to about 1700 only. Has anyone else experienced this?

 

[Dodgentwo]

Yep. Have the same thing in my 97 with a southbend 3600 dual disc. Not sure what it is. Scared ya the first time didnt it

 

[Scooter's Roofing]

let that noise be your guide to prevent accelerated transmission wear, especially 5th gear go byebye wear

if you can't help yourself, might I recomend a bigger turbo?

 

[MD-LUCKY]

Yup. Have a nasty groan around that same RPM with my Haisley dual disk.

I try to drive around it.

 

[JSPulliam21]

Scared ya the first time didnt it

I thought :aiwebs_016: Then, oh well :drive:

let that noise be your guide to prevent accelerated transmission wear, especially 5th gear go byebye wear

if you can't help yourself, might I recomend a bigger turbo?

I try to get through that rpm range quickly, or not get that high until I am in the gear I want to be in. I igured the resonance was not good at all, and have tried to drive around it as much as possible. It is not noticable if I accelerate slowly and smoothly, though. Why a bigger turbo? Yes, you may recommend a bigger one.:charger:

 

[Scooter's Roofing]

a larger turbo will spool up later, and you'll be less inclined to lug it

 

[JSPulliam21]

What RPM constitutes lugging?

 

[Scooter's Roofing]

an RPM/load condition that causes pronounced rattling through the transmission

if the truck was stock fueling, you wouldn't hear it near as loud

 

[Ph4tty]

My fluidamper cut the tranny groan in 1/2.

 

[DISTURBED]

Was going to say to put a fluid dampener on that should help alot with vibrations