Open loop vs Closed loop
09-13-2008, 04:11 PM
#1
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Car: C3
Engine: GMPP w/TPI
Transmission: TH350
Open loop vs Closed loop
So, I have my TPI more or less tuned.
Base timing is 10 degrees on a GMPP 12499529 engine with a heated O2 sensor, 1.6 rockers, SLP runners and 24lb injectors.
Thoughts?
Engine has less than 2k miles on it, injectors were replaced almost at the same time.
- Runs great in what I believe is open loop (cold or WOT conditions).
- Runs a bit rough in closed loop- seems to have a bit of a drop in power and a noticeably different sound to the way it runs. Almost like a light miss.
Base timing is 10 degrees on a GMPP 12499529 engine with a heated O2 sensor, 1.6 rockers, SLP runners and 24lb injectors.
Thoughts?
Engine has less than 2k miles on it, injectors were replaced almost at the same time.
Last edited by DarkShark; 09-13-2008 at 04:20 PM.
09-14-2008, 07:22 AM
#3
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Car: C3
Engine: GMPP w/TPI
Transmission: TH350
Re: Open loop vs Closed loop
That is what I'm thinking.
Not yet. I need to purchase an ALDL to USB. I have another chip. I think I'll swap it and see what happens in the meantime.
Thanks for the reply
Not yet. I need to purchase an ALDL to USB. I have another chip. I think I'll swap it and see what happens in the meantime.
Thanks for the reply
Last edited by DarkShark; 09-14-2008 at 07:26 AM.
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