Kenin

I just got my 66mm turbo put on my truck and love it. However, when it is in overdrive and hits 40psi boost the turbo begins to shutter. I am still breathing through the stock airbox with a drop in filter and I believe that is the problem. I do have a custom 6" intake system coming based off of the *****'s Whistler but had to buy the parts to fit a second gen. in hopes to solve the problem. Will this fix the problem?

Number47

when you say the "turbo begins to shutter" do you mean pressure?? is the turbo wastegated?

Blueboy

When you get on it and then let off quick it will shutter.
Bring it up to 40 and back off slow .

HOHN

That's not your stock airbox.

That's called "surging". What's happening is that turbo is trying to pump in more air than the engine can handle, and the air is flowing backwards out of the intake to relieve the pressure.

When you let off, the energy driving the turbo disappears, so the compressed air in the intake tract can easily go back out instead of into the engine.

This is what happens when a compressor that is too large for the application is "overspooled". A larger housing shift the operating range of the compressor farther away from the surge line on the compressor map, but it will be laggier.

Don't make it a habit of doing this to your turbo. This is VERY hard on a turbo and can snap a shaft and do other kinds of carnage if done habitually.

jh

Kenin

The turbo is really the stage three system for dodge from turbonetics. It has a 66mm compressor and the exhuast wheel is bigger than the front wheel. I have been told that the exhaust housing was to big. I am not letting out to here the shutter I am accelerating hard.

NoSeeUm

Is the noise when you let off the throttle or when you are on it hard?

As far as the air box, try disconnecting the air hose and run a few miles with unfiltered air to the turbo. See if that changes anything.

Jim

Diesel Doc

you may be sucking the intake tube closed. I have heard of it hapening more than once it will make sounds like you are describing.

dsl kicks gas

befor it would suck the intake tubw closed it would suck down the finlter indicator, i know 05 was doing that with the stock air box......just a thought

Number47

well if the turbo is wastegated, when you hit your pressure the wastegate opens and allows exhaust to bypass the exhuast wheel and thus allowing control of pressure, but theres a catch. if your wastegate is big enough it will allow enough to by pass that the pressure will drop and the wastegate to close. and it repeats that cycle. had that problem with my brothers Mitsubishi Eclipse.

HOHN

Check the air intake tube. That stg 2 T-netics moives a lot of air (there is no stg 3 for CTD). The stg 2 based on the HP66 is apparently what you have, and YES-- it needs more air than the stock filter can deliver.

jmo

Diesel Doc

Not always an a 2nd gen trk. They had a tsb for it I believe . it isn't that the filter isn't flowing it is the 180deg turn the intake tube makes on the 2nd gen's some of the tubes were molded too thin and they would colapse on bone stock trucks. Yes if the filter or airbox isn't flowing it will read on the guage, but if it is a bad intake tube it will not register on the indicator.

Kenin

It is the stage 2 turbonetics turbo but it has a 68mm exhaust wheel insted of the 66mm so he said it was like the stage 3. All in all I am satisfied with the turbo other than the surging. I did get the whistler put on my truck and wow is the turbo loud, but the shutter is still there just louder. Waiting on a call back from turbonetics on a 66mm exhaust wheel instead.