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Old 08-16-2010, 03:03 PM   #1 (permalink)
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6.5 tb overboosting?

just got a 99 6.5tb a week back,
seems to be hitting 15 psi on steep climbs towing car trailer with total 6000lbs, this cant be stock, how can i adjust the waste gate for more modest boost pressure say 10 psi or lower, not sure if its related but on the steeper longer climbs temperature hit 230 F once, exhaust gas tempurature is 8-900 degrees, seems kinda hot to me, and the trans hits like 190 -195 max all normal?
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Old 08-16-2010, 04:19 PM   #2 (permalink)
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Check to see if the boost line fitting is aftermarket. The fitting will have a tiny pin hole in it instead of the factory wide open fitting. Also not sure about the chevy but my cummins will hit 1100 townig up a hill trying to run 65mph and thats not max. My egt sensor fitting is tapped right at the manifold prior to the turbo. If yours is the same i've gotta imagine thats not horrible cause cylinder temp is not too bad. I would reccomend electric fans if the speed is dropping too low while pulling a hill. But like i said im a cummins guy and your truck might have lower egt maxes?
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Old 08-16-2010, 04:49 PM   #3 (permalink)
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http://www.kennedydiesel.com/detail.cfm?ID=44

"For non-Intercooled vehicles, a 9-12 psi peak is the maximum recommended.
More boost can be used on Intercooled applications.
Proceed with caution."

I used to know a guy that was running 18 PSI on a 6.2, not sure how long that lasted
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Old 08-16-2010, 05:38 PM   #4 (permalink)
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Quote:
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I used to know a guy that was running 18 PSI on a 6.2, not sure how long that lasted
prolly not long,unless hes spent an absurd amt of $$ rebuilding it to take it!
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Old 08-16-2010, 09:13 PM   #5 (permalink)
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Quote:
Originally Posted by yotajeep View Post
just got a 99 6.5tb a week back,
seems to be hitting 15 psi on steep climbs towing car trailer with total 6000lbs, this cant be stock, how can i adjust the waste gate for more modest boost pressure say 10 psi or lower, not sure if its related but on the steeper longer climbs temperature hit 230 F once, exhaust gas tempurature is 8-900 degrees, seems kinda hot to me, and the trans hits like 190 -195 max all normal?
I used to hit 1200-1300 sustained on my turbo'ed 6.2 running about 13-15 psi. i think you are okay. Mine lasted quite a long time until i over speed it and the crank broke in 2.
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Old 08-17-2010, 11:17 PM   #6 (permalink)
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well the egt gauge was mounted after the turbo on the exhaust so its probably reading lower then it should be. Seems to me that my clutch fan isnt kicking in at the right time, or at all, which i believe to be the problem with the overheating
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