Chevy and GMC Duramax Diesel Forum - View Single Post

**Pat@BD** · 06-13-2006, 11:22 AM

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D-max's have a hard time getting boost up because tranny wants to downshift into fourth below about 2200 RPMs. When I did my dyno run of 532HP/950torque, I could only build 25pounds of boost. My truck makes 40 pounds on the street. My Torque #'s were low because of lack of boost.

Thanks for the info,
Rob[/quote]

When we dyno them here we use the scanner to hold them in 4th gear. That way there is no issues with the down shift. You are right about the torque numbers. That seems to be a pretty big jump for just an air filter.

06-13-2006, 11:22 AM	eBay Motors #3 (permalink)
Pat@BD DF Sponsors Join Date: Jun 2006 Posts: 158	[ D-max's have a hard time getting boost up because tranny wants to downshift into fourth below about 2200 RPMs. When I did my dyno run of 532HP/950torque, I could only build 25pounds of boost. My truck makes 40 pounds on the street. My Torque #'s were low because of lack of boost. Thanks for the info, Rob[/quote] When we dyno them here we use the scanner to hold them in 4th gear. That way there is no issues with the down shift. You are right about the torque numbers. That seems to be a pretty big jump for just an air filter. __________________ Pat Stewart Technical Sales BD Power www.dieselperformance.com 800-887-5030 ext. 101