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Old 05-26-2012, 04:54 AM
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Default turbo whinen & cryin?

Back from my sabatical. Took a road trip to Montana with a 3 horse trailer. Truck in sig, stock turbo & injectors. The truck had not made a peep til mid trip. In Wy. on most of those I-25 grades the pull would start with 20-30 psi boost and 1000*-1100* EGT and 1-2 min into it, the turbo would start this high pitch whine. I would come off the fuel and stay close to 20 psi boost & this would decrease the whine a little? I also have a nice exaust manifold leak, tick.. Nothing like a good road trip to work out/ uncover all the gremlins.
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98 3500 4X CC with a flatbed, A work in progress, BHAF, Banks Big horn, 4" MBRP, 4GSK, AFC, #10, Draw straw I with 1/2 supply to LP, 3/8 return, 16* time. Soon $$ Injectors & Turbo.

Last edited by stodg73; 09-16-2012 at 08:34 AM.
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Old 05-26-2012, 10:46 AM
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Did you loose any boost pressure? Sounds a lot like a small boost leak to me. I have heard the turbo on a big truck sound just like a police siren when it had a boost leak. You may need to make a test setup to test for leaks. Pay close attention to the lower boot on the passenger's side at the intercooler. That one can swell under pressure and rub on the inner fender. I have had the first one off the turbo leak twice, but it would make my truck really smoke.
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Old 05-26-2012, 02:00 PM
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Tom I did look and listen all around the turbo with truck running & can't see or hear a leak, never lost boost. Can hear the exaust manifold leak near the fire wall.
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98 3500 4X CC with a flatbed, A work in progress, BHAF, Banks Big horn, 4" MBRP, 4GSK, AFC, #10, Draw straw I with 1/2 supply to LP, 3/8 return, 16* time. Soon $$ Injectors & Turbo.
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Old 05-26-2012, 04:22 PM
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With mine I held the throttle open some to get the engine to about 1200 or so RPM to get the turbo spinning a little more then I was able to hear the leaks. At an idle I could not hear any leaks at all.
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1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
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Old 05-26-2012, 05:17 PM
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Tom what do egt temps when you pull your 5er? Yes I did rev it 12-13k for inspection. what about testing turbo for failing bearing, shaft, & or fan wheel?
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98 3500 4X CC with a flatbed, A work in progress, BHAF, Banks Big horn, 4" MBRP, 4GSK, AFC, #10, Draw straw I with 1/2 supply to LP, 3/8 return, 16* time. Soon $$ Injectors & Turbo.
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Old 05-26-2012, 08:04 PM
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Most of the time I see about 900* to 1000* on flat ground. I have a hard time getting to 1200* with the turbo I have.
Far as testing the turbo, take the intake to it off and see if there are any marks on the side that look like the compressor wheel was rubbing. Try to move the wheel side to side and forward to rear. Side to side there should be almost no movement, so if you can get the wheel to touch then you have a problem. Some front to back movement is normal, but you shouldn't see much.
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1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
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Old 05-27-2012, 12:56 PM
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Thanks I'll be tearin it down later. What turbo are you runnin and will it handle bigger injectors i.e. 75Hp?
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98 3500 4X CC with a flatbed, A work in progress, BHAF, Banks Big horn, 4" MBRP, 4GSK, AFC, #10, Draw straw I with 1/2 supply to LP, 3/8 return, 16* time. Soon $$ Injectors & Turbo.
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Old 05-27-2012, 01:07 PM
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Quote:
Originally Posted by rdsutton View Post
Thanks I'll be tearin it down later. What turbo are you runnin and will it handle bigger injectors i.e. 75Hp?
Dave, all I have for a turbo is an HX35 with what was called (at the time) an "updated" exhaust housing. I don't know exactly what that means, but I see only about 2 to 4 psi boost at 70 mph empty on level ground. For injectors I have what are RV275s that have been EDM'd to be called 300s. I do know that on the same dyno they gave me an actual 66 HP increase in rear wheel power. I can pull most any hill without worrying about EGTs getting too high. My daughter has a '98 12v 4wd with an HY otherwise the same set up as mine and EMPTY I have hit 1300* with it! She also sees about 10 psi at 70 mph too!
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1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
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Old 05-29-2012, 04:29 PM
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Thanks Tom, I'm wanting to decrease my EGT's while pullin. I'd like some guidence/ direction on sloving this issue. I've heard that a bigger turbo-i.e. more CFM is not always the answer. SO I'm open to what others have to say. Your running the same turbo I have & you can run hills with a load & 1K to 1.2K on the pyro meter? Whats your boost run on hills?

Hey ISX, have you ran or installed a Hybrid Holset Hx35/40 turbo, if so what were the results? Thanks all.
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98 3500 4X CC with a flatbed, A work in progress, BHAF, Banks Big horn, 4" MBRP, 4GSK, AFC, #10, Draw straw I with 1/2 supply to LP, 3/8 return, 16* time. Soon $$ Injectors & Turbo.

Last edited by stodg73; 09-16-2012 at 08:37 AM.
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Old 05-29-2012, 04:59 PM
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Without propane my boost does not go over 32 PSI and with propane I can hit 36 PSI. One thing to keep in mind is the waste gate has a bunch to do with the way your turbo works when you are pulling hard. If you go over the map of the turbo you do nothing but heat the air that is going into the engine, thus raising your EGTs AND the drive pressure.
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1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
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