Hi to everyone, hopefully somebody can help me I em little puzzled by my problem.I was on my way to Mexico, watch Baja 250 pulling my toybox trailer, around 10000 # loaded weight. I will try to explain my problem best I can. What happened after couple of hour driving that anytime I started to go little uphill and my speed lowered under 60 MPH my turbo started barking
( I think was the turbo ) and you can see on my boost gauge that needle started bounce up and down in difference about 5 PSI. Mostly happened when my boost gauge show 20 PSI, speed under 60 mph, 1600 RPM and transmission in overdrive, temperature of exhaust around 1000 and I hold steady on gas pedal. What I need to do is a switch from overdrive to stop this annoying barking. And look to me even that now turbo is a barking more often, even if I just let go on gas just a little bit and even on lower boost pressure. Before that I can make turbo bark, but only on pressure around 30 PSI and fast release of gas pedal.I em incline to say problem is the turbo, because I replace OEM one with a Pier 35 HX turbo about 3000 miles ego, but what could be wrong with it ? And was not a problem first 2500 miles which around 1000 was towing same trailer. If I look from compressor side, wheel spin freely and I don't have problem to pump 34 PSI like before. Could fueling have something to do with it ? I do run Power Edge on middle jumper and EDM 1.5 injectors, for filter I use Scotty II system and I do have 4 inch exhaust. Any idea what is a problem ? Anything to help me to start fixing this problem will be appreciated very much.
THX czechdiesel

 

It sounds like your turbo is doing what we call surging.... The PDR HX35 turbo you are runnig normally doesn't exhibit this though. The turbo should be fine for the trip but you may want to have it checked out once you return home.

Doug Smith

 

Thanks, for your response. I will pull turbo out when I get back, but what I need to look for ? What exactly is a cause for a surging ? Could exhaust housing be the problem ? I still run 12cm housing. My waste gate is a disconnected. Sorry for so many Q.'s, but I like to learn as much is a possible about this problem, it is new to me.
THX czechdiesel

 

Not sure about this helping... but towing 10,000 lb in OD, at 60 mph, up a hill, with 3.55 rear end.... sounds like your possible problem. 1600 RPM, with that load, is way to low.. IMHO.
May or may not have a turbo problem but sounds like you could be lugging your engine.

I would try locking OD out till 2500 rpm of so on hills or when accelerating and see what happens. Do what you have to to stay over 1900-2000 rpm in OD with that load, or stay in 3rd ..... and see if things aren't better? Let us know.

Engine will run all day at 2500 rpm with no harm done... but the sound takes some getting use to.

Just a guess.

RJ