[Diy_efi] Lumpy engine in closed loop cruise

[Becker, Damon Damon]

The turbo doesn't like being heated like that, even at very low boost.
Your EGTs are VERY hot if you are anywhere close to 14.7 and 130 kPa.  
 
How certain are you that you are in closed-loop at 130 kPa?  

  _____  

From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
On Behalf Of Dermot O'Hare
Sent: Thursday, October 20, 2005 9:55 AM
To: diy_efi at diy-efi.org
Subject: RE: [Diy_efi] Lumpy engine in closed loop cruise



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	It's hard on the turbo to hold boost for a long time like that.
FYI. 

	 

	You shouldn't be in closed-loop at that high of a manifold
pressure.  At the very least you are giving up power, and probably
detonating. 

	 

	If you didn't rechip that GM ECU, then my theory is you are
misfiring and sending unburned O2 down the exhaust and it's being picked
up by the O2 sensor and registered as a momentary lean spot in an
otherwise rich situation.  There's no way that GM ECU would allow the
engine to be lean at that high of a boost. 



Sorry, if I mislead you.   It is at almost no boost, very low load about
.2-.3 bar above atmospheric.  130 kPa absolute.


Dermot

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