Losing Boost Under Full Throttle?
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Losing Boost Under Full Throttle?
I have a 2000 excursion with a 7.3 . My micro tuner is the only mod. Under heavy accerlation the truck is fine until i hit 17 pounds of boost and then its sounds like the rest is getting blown off. I started haveing this problem about 3 weeks after I installed the tuner. When I install the stock tune this problem goes away. Was wondering what ya'll think?
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Joined: Jan 2004
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From: colorado
Originally Posted by A355ONGAS
I have a 2000 excursion with a 7.3 . My micro tuner is the only mod. Under heavy accerlation the truck is fine until i hit 17 pounds of boost and then its sounds like the rest is getting blown off. I started haveing this problem about 3 weeks after I installed the tuner. When I install the stock tune this problem goes away. Was wondering what ya'll think?
Fleet Owner
Joined: Jun 2004
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From: Rio Rico, AZ.
No, it's a common problem with modified PSD engines. The stock turbo cannot keep up with the demand and all the pressure rushes back out of the intake housing. It least that's what I have been able to gather from reading here on the forum. If you leave it on a stock tune or at most a mild tune and you're ok.
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From: Lake Stevens, WA
May just be the factory wastegate doing what it is designed to do. Try removing the red boost tube going to the wastegate and stuff it on the one of the clamp bolts nearby. With the clamp mod and a bypassed wastegate I CAN go all the way up to about 28 psi, but seldom do. 
