kinda think I have a problem here

[Cj Ford]

Today I was pulling my trailer loaded, about 10,000 lbs. I had it on my aggressive tow setting as usual when I tow. anyway I went to pass a few cars buried the pedal to the rug and watched the boost go up and up and up to about 25/26 psi the truck started making weird noise like the turbo was stopping then going (i know this isn't possible but that's what it sounded like) kinda like a turbo stuttering??? kinda a whooshing sound but broken up... anyway I eased off and tried it in my economy setting that only lets me see 22 psi or so and it didn't do it at all.. then I tried my heavy load tow mode and it did it but not as bad.. I know on both my tow settings the boost pulls up really high really fast unlike the economy setting.. even my extreme setting don't make boost like both my tow settings.. the come on slow until they hit about 6 or 7 psi then shoot up to 25 26 27 28 and even 30 a couple times..

my question is what do you think it could be no codes no cel either... do you think its possible to much boost from the stock turbo and the computer is doing something because of it? The truck didn't fall on its face, if I stayed in the throttle it would continue to go but would also continue to make the sound until I eased off and the boost came down egts were in check at 1150-1200

[mschn99]

sounds like turbo surge to me......its fairly normal at your mod point but is not good at all for your turbo. You did the right thing by backing out of it and keeping it from happening.....a new turbo or compressor housing will help...

[rankroddin250]

what marc said was my guess.

[Cj Ford]

I have the early 99 so I guess my best bet is to get me the D66 sooner then later, I was trying to hold off till Feb or March... and ya I didnt wanna break anything so I finished the tow in heavy tow mode and kept the boost under 23psi .. it ran like a champ then..

Thanks Marc

[Raul@Stealth Automotive]

yup i agree.... sounds like surge....

[Cj Ford]

does it make scence it only does it under heavy load? Because I can run it to the floor in 6th on any of the settings and I dont have the sound/issue even with 25 26 psi unloaded

[dirtbikeguy2003]

I get that with mine alot on hills only pulling a 7000 toy hauler. As soon as i crest the hill it goes away. Mine stops pulling but doesnt loose anything either. I dont have a boost only a pyro and tranny temp and my pyro never gets over 900. It makes the noise like the turbo is poping off over and over.

[Cj Ford]

Originally Posted by dirtbikeguy2003

I get that with mine alot on hills only pulling a 7000 toy hauler. As soon as i crest the hill it goes away. Mine stops pulling but doesnt loose anything either. I dont have a boost only a pyro and tranny temp and my pyro never gets over 900. It makes the noise like the turbo is poping off over and over.

thats the sound im talkin about... guess its time for a turbo upgrade

[dirtbikeguy2003]

Is that what that means time for a new turbo? I thought it was just pushing too much boost, but i dont know for sure because i dont have a boost gauge.

[Ditty]

It's surge. It does tear your turbo up, but it doesn't nessesarally mean you need a new turbo right now. Constant surge will lower the life of your turbo, destroying it slowly...but if you get surge every once in a while, I wouldn't worry about it too much. A wicked wheel, ATS compressor housing, and/or a larger exhaust housing will help minimize the surge until you have the $$$ for a full aftermarket replacement turbo.