C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Before and after injectors

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Old May 19, 2009 | 05:46 PM
  #61  
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mseven
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Originally Posted by STL94LT1
I've already reduced those values by 50% and it did help, especially on cold start-up. I can run the car, stop for a few minutes and it will fire right up. But, if I let it sit for a couple of hours it will load up at start.
My enrich vs start-up goes from-40 _140c., so I had to tweak it a almost across the board to get it in there.
Have you looked at the OL. targeted AFR in that temp area when this was happening?
I had to reduced the OL target afr. from about 56*c and up. This was after seeing that once the start up enrich timer was done it was at 10:1. with an cts/ambient of 50*.
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Old May 19, 2009 | 05:53 PM
  #62  
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STL94LT1
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Yeah, I reduced the enrich vs startup across the board. I played around with the OL target AFR before I made these changes. I'll go back and try the OL changes in the affected temp range.

Thanks for the help.
-Mike
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Old Jun 19, 2009 | 10:04 AM
  #63  
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From: Derry nh
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Update on the injector/mileage issue that started this thread. With the Bosch Design III injectors from Jon and the fuel pressure set to 39psi, back to running good with highway mileage in the upper 20's. Still running lean BLM at cruise so suggested to bump the pressure up a few lbs.
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Old Jun 19, 2009 | 10:14 AM
  #64  
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Originally Posted by rickso84
Update on the injector/mileage issue that started this thread. With the Bosch Design III injectors from Jon and the fuel pressure set to 39psi, back to running good with highway mileage in the upper 20's. Still running lean BLM at cruise so suggested to bump the pressure up a few lbs.
I would try 43.5
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Old Jun 22, 2009 | 12:51 PM
  #65  
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From: Derry nh
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Thanks, Jon. Once the shop gets the FP meter back from repair I'll up the FP and see if my cruise BLM goes down.
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