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Old Jul 31, 2007 | 05:35 PM
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tholt34
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Turbo Surge

When towing a load, at what psi do you guys usually ecounter turbo surge with a stock turbo? Also, if you have a chip, what power level are you running it in? I guess i may be looking into a WW here soon or an ATS housing.
 
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Old Jul 31, 2007 | 05:41 PM
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A boost of 15 to 17 psi was the worst for me when towing a grade in OD with a 70 HP Superchip.
 
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Old Jul 31, 2007 | 05:52 PM
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In my truck pulling a grade with my box traler or anything with it in the 80 horsepower race setting on my edge i am in overdrive and around 65 mph if i try to push it much over 11 to 12 psi it starts to do it real bad. If i am going faster or down shift it and get the rpms up it doesn't seem to do it all.
 
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Old Jul 31, 2007 | 10:21 PM
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Originally Posted by tholt34
In my truck pulling a grade with my box traler or anything with it in the 80 horsepower race setting on my edge i am in overdrive and around 65 mph if i try to push it much over 11 to 12 psi it starts to do it real bad. If i am going faster or down shift it and get the rpms up it doesn't seem to do it all.
Downshifting to a lower gear increases the rpm, which in turn increases the cfm air flow into the engine, which moves your operating point on the compressor map (boost vs cfm plot) to the right, which moves you to the right of the surge line (which slopes upward in a left-to-right direction), and allows you to pull a higher boost without bumping the surge line.

Don't operate in a surge condition, it will wear out your turbo bearing. I know, because I had to replace my turbo because of doing it before I learned better.
 
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