Pontiac Solstice Forum - View Single Post - Interesting info on our stock KD04 turbo

I'd like to offer that with hundreds of PPC Tuners in the field, we've yet to see a turbocharger failure at boost pressures above 15 PSI. The VW application cited here may not be directly comparable.

However, in comparing notes with GM engineers, we have determined that anything over 325-ish engine HP worth of airflow (about 280 WHP) can overspeed the stock turbocharger. More than anything, this seems to be the upper limit of the turbo's durability.

Boost pressure in and of itself is actually a somewhat arbitrary number, as it's not a direct indication of airflow. HP, on the other hand, is a very direct indication of airflow, and in turn, turbocharger speed required to produce said airflow.

__________________
Bill Hahn Jr., Hahn RaceCraft, Inc.
Home of the World's Quickest and Most Powerful Solstices
First to the 14's, 13's, and 12's in the 1/4 Mile
12.00 @ 117 MPH Street Solstice World Record
Hahn RaceCraft, Inc.
Turbocharging GM's since 1988
http://www.turbosystem.com

Last edited by EcoBoost : 07-04-2008 at 03:34 PM.

	EcoBoost Supporting Tuner Join Date: Jan 2006 Location: The best is yet to come :)	I'd like to offer that with hundreds of PPC Tuners in the field, we've yet to see a turbocharger failure at boost pressures above 15 PSI. The VW application cited here may not be directly comparable. However, in comparing notes with GM engineers, we have determined that anything over 325-ish engine HP worth of airflow (about 280 WHP) can overspeed the stock turbocharger. More than anything, this seems to be the upper limit of the turbo's durability. Boost pressure in and of itself is actually a somewhat arbitrary number, as it's not a direct indication of airflow. HP, on the other hand, is a very direct indication of airflow, and in turn, turbocharger speed required to produce said airflow. __________________ Bill Hahn Jr., Hahn RaceCraft, Inc. Home of the World's Quickest and Most Powerful Solstices First to the 14's, 13's, and 12's in the 1/4 Mile 12.00 @ 117 MPH Street Solstice World Record Hahn RaceCraft, Inc. Turbocharging GM's since 1988 http://www.turbosystem.com Last edited by EcoBoost : 07-04-2008 at 03:34 PM.