Engine/Transmission (1998.5 - 2002) Boost pressure blew hose off turbo

[concrete-steve]

I just installed the Edge comp in my truck, what a difference. My turbo has the hard line, so there was no wastegate elbow to change. I haven't figured it out, but the boost at stock was about 22 psi and now I can get 38 psi... can anyone explain this? I thought the wastegate was controlled mechanically. Well this aside, I stepped into it and heard what sounded like a loud backfire and thought the worst as now the boost gauge read zero and the truck lacked power. Turned out, the rubber section of the hose exiting the turbo and going into the cooler blew off. Is there anything I should be doing with the other clamps other than snugging them up to avoid this again?

 

[Hahn007]

Because you say your turbo has the hard line I assume it is the Hy-35 used on the auto's. I am no expert but I believe 38 psi is WAY too much pressure for that turbo. I thought anything above 30 psi was out of it's mapping zone.

 

[Cummins Thunder]

I thing your waste gate may be slightly jammed.



In stock trim your truck should make no more than 19-20psi. With the comp and no waste gate mods you should see about 28psi. With waste gate totaly clamped shut you should 37-40.



Ill see if I can find a picture of my HY waste gate riggin, even tho it looks like you don't need to mess with your waste gate.



CJ

 

[obert]

I'm kinda wonderin' about this, too. Well, not much any more. I could get around 25 psi with NO mods. I have never touched the wastegate, although Im the 2nd owner, but the truck only had 26K on the clock when I got it.



With the TST I can go about 32psi, still not touched the wastegate, and have NEVER set an overboost DTC.



This thread caught my eye cause since going over 30psi, Ive had nasty trouble with the hose directly off the turbo. I loosened evrything up on that side, swapped the hose for the one on the manifold, and re clamped evrything on the turbo side, making sure evrything was lined up and the clamps fully onto the hoses. No truoble with that so far.

I have the stock HX-35.

 

[concrete-steve]

I don't know which turbo it is, but yes it is an automatic and has the hard line. I've never touched the wastegate and never got an overboost code from the added boost. I've got a heavy foot, at what boost level should I be worried about breaking something on the truck?

 

[EricBu12]

Best thing to do with those pressures is to get a set of silicone hoses from Mr bob's. .



I had the stock hoses and at 35 psi that same hose was always popping off... since the new hoses have been on. not one time popped off up to 40 psi... .



I have a hybrid HX 35/40 W/14 cm housing... wastegated to 40 psi. this is pretty ecconomical and durable for towing... . spools up almost as fast as the stocker and has a lot of power.

 

[SGrasmick]

When It had the stock Turbo and injectors, I ran over 42 pounds on my stock HX35 with a chip, chip off I am lucky to hit 25-28 pounds. Its not umcommon, and yes past 32 pounds that turbo is inefficent but never the less my truck ran well with a TST and exhaust

 

[Cummins724]

When I had the stock turbo on my truck,I had the same problem with the same hose. I double nutted each of my clamps & now she holds 45psi. continuously & never blew the hose again. Just crank it down tight & double nut it & you shouldn't have this problem again. [the heavy duty boots aren't a bad idea though]

 

[Hahn007]

When It had the stock Turbo and injectors, I ran over 42 pounds on my stock HX35 with a chip, chip off I am lucky to hit 25-28 pounds. Its not umcommon, and yes past 32 pounds that turbo is inefficent but never the less my truck ran well with a TST and exhaust

The original poster has the HY-35 not the HX-35. Seems like this thread took an immediate detour.

 

[obert]

... . took an immediate detour.

Yeaahh.



I know the hose clamps can be tightened too much. At one point after blowing the subject hose off a number of times, I cranked the "h" out of the clamps. The next load came, and not only did the hose blow off, but the clamp broke, too. I may have streached it too much. Now I caryy an extra clamp, so that shouldnt be happening anymore, you know how it goes... .



Add that to my previous thought of making sure the clamps are fully over the hoses and all connections lined up well.



Regaurdless of turbo model and its "happy range", Is 30-some psi really too much for factory intake pluming? I didnt figure that as over the limit. Perhaps the elevated intake temp. only worsens the problem...