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Old 06-04-2014, 08:46 PM   #1
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Turbo Boost Issues - Problems

2005 Alpine Coach, 36FDSS, Cummins ISL 400 Pegasus / WRV
8.8 L / 538 CID (Yes, it says 8.8 not 8.3 or 8.9) Engine No. 46429471

My turbo has stopped boosting – almost.
When working correctly the SilverLeaf showed up to 23 psi & maybe higher.
Just going down the road the boost dropped to 6 – 8 psi and it will barely climb a slight grade.
I have no idea why this happened. I lifted the bed and looked around and found a 90 degree black rubber & canvas elbow with a small slit and a hole I can put my finger thru.
I can’t see all around the elbow at this time. Could this be the problem? I would be inclined to think this would reduce performance but not that much. Does anyone know where I can buy that elbow?
See attached photo. Click photo to enlarge it. Thanks.
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Old 06-04-2014, 09:11 PM   #2
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A hole in the inner cooler plumbing could certainly reduce boost by allowing pressurized air leak out. Contact any Cummins parts dealer and they can provide the part.
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Old 06-05-2014, 05:21 AM   #3
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I see as high as 31PSI of boost as indicated by my in dash SilverLeaf. You may be able to get the elbow from Truck Accessories, Parts & Custom Trucks | Perfection Equipment I know they were a source for another elbow on the turbo system.
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Old 06-05-2014, 09:07 AM   #4
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YUP--many 05 owners have had problems with the rubber pipe connections on the turbo loop splitting. You can do a search on this forum and find the part numbers--probably not a Cummins part. If you find a replacement, be sure to get the hi-temp pink/beige connectors and not the lower temp OEM blue ones--likely this was the issue to begin with.
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Old 06-05-2014, 11:09 PM   #5
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Typical report when the post-turbo elbow blows is substantial loss of power.
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Old 06-05-2014, 11:15 PM   #6
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Since it won't make the boost it would give it he extra fuel for the power.
fix that hole and you'll be mountain climbing again.
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Old 06-06-2014, 11:31 AM   #7
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I can't seem to find any post concerning Turbos or Elbows. Cummins tells me it is a manufactures part. I have not removed the old one yet. Does anyone if it is a 5" elbow or whatever size and where I can buy one.
Truck Accessories, Parts & Custom Trucks | Perfection Equipment
Truck Accessories, Parts & Custom Trucks | Perfection Equipment
have a 5" hot side with a tight radius.
Any more info would be appreciated.
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Old 06-06-2014, 01:08 PM   #8
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Quote:
Originally Posted by tjshively View Post
I can't seem to find any post concerning Turbos or Elbows. Cummins tells me it is a manufactures part. I have not removed the old one yet. Does anyone if it is a 5" elbow or whatever size and where I can buy one.
Truck Accessories, Parts & Custom Trucks | Perfection Equipment
Truck Accessories, Parts & Custom Trucks | Perfection Equipment
have a 5" hot side with a tight radius.
Any more info would be appreciated.

Most of the time the 4" is the size you need:

http://intakehoses.com/Merchant2/mer...ory_Code=CACH5


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Old 06-06-2014, 05:06 PM   #9
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Thanks to everyone.
I ordered a 3648-400-MK Silicone Elbow 4" ID X 90 Degree - Matte Red - 500F
from Intake Hoses, IntakeTubing, and Intake Clamps - Intakehoses.com -- $77.14 + $12.78 S7H = $89.92
I will install it and post how it all worked out.
Thanks again.
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Old 06-08-2014, 02:47 PM   #10
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Turbo Hose
The Purosil 90-400-16 (350 degree) was $ 37.22, The 3648-400-MK was $ 53.53 or a little mover 50% or $ 16 more. I opted for the MK. Again Purosil's telephone number is 800-877-5342. 90 degree blue= 4" X 13" on outside radius
Prices are a few years old.
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