Wire it straight to the ecu. Then it shows up in the logs along with all other data. Best way to have it.
Copy over current values into 11P and start logging.
Need any help copying current one over just post away.
Non lock up converter idle issue
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Holden202T
- Posts: 10311
- Joined: Sat Feb 28, 2009 9:05 pm
- Location: Tenambit, NSW
- Contact:
Re: Non lock up converter idle issue
I agree, before you spend too much time on it, grab $11P zip from here http://pcmhacking.net/forums/viewtopic.php?f=27&t=3798
copy over your main changes like idle rpm, ve and spark .... then wire in the wideband analog input from the lm2 into the ecm, its pin D8, theres also instructions in the $11P zip how to mod the ecm for the wideband input.
once you've got wideband readings in the logs you'll be able to easily adjust the fueling where needed.
as for weather you need more fuel or more spark in the lower rpms is going to be a matter of trial and error, but also if you change the open loop AFR table to be something like 14 that will stop it going into closed loop and blms adjusting the fueling then you can make the VE table match the target AFR's, then once its all right try changing the open loop AFR's back to 14.6 and see if it surges, if not then you'll probably be right with it that lean ....
and this is the hard part without a dyno, but once the fuel is right there try and advance the timing till you have the lowest map sensor reading and that is going to be close to what timing it will want in that area, and once the timing is done you might find you can change the open loop AFR's back to 14.7 and it will no longer surge ...
copy over your main changes like idle rpm, ve and spark .... then wire in the wideband analog input from the lm2 into the ecm, its pin D8, theres also instructions in the $11P zip how to mod the ecm for the wideband input.
once you've got wideband readings in the logs you'll be able to easily adjust the fueling where needed.
as for weather you need more fuel or more spark in the lower rpms is going to be a matter of trial and error, but also if you change the open loop AFR table to be something like 14 that will stop it going into closed loop and blms adjusting the fueling then you can make the VE table match the target AFR's, then once its all right try changing the open loop AFR's back to 14.6 and see if it surges, if not then you'll probably be right with it that lean ....
and this is the hard part without a dyno, but once the fuel is right there try and advance the timing till you have the lowest map sensor reading and that is going to be close to what timing it will want in that area, and once the timing is done you might find you can change the open loop AFR's back to 14.7 and it will no longer surge ...
No matter what the question is, the answer is always more horsepower! 
Just starting out? Have a read of the getting started guide
Basic tuning of a delco ECM with $12P thread
Advanced tuning of a delco ECM with $12P thread
Just starting out? Have a read of the getting started guide
Basic tuning of a delco ECM with $12P thread
Advanced tuning of a delco ECM with $12P thread
Re: Non lock up converter idle issue
Thanks for all the info.
I tried the changes and so far so good no hunting at all with
closed loop re enabled.
Ill give 11p a go soon for sure.
Already copied most of it over so should have a good starting point.
Car drives really nice now but want to experiment with some more
timing and different afr's.
Might get a better o2 sensor is after market ntk so not sure how good it is either.
I tried the changes and so far so good no hunting at all with
closed loop re enabled.
Ill give 11p a go soon for sure.
Already copied most of it over so should have a good starting point.
Car drives really nice now but want to experiment with some more
timing and different afr's.
Might get a better o2 sensor is after market ntk so not sure how good it is either.
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Holden202T
- Posts: 10311
- Joined: Sat Feb 28, 2009 9:05 pm
- Location: Tenambit, NSW
- Contact:
Re: Non lock up converter idle issue
what did you do, make it richer or increase the timing to stop it hunting ?
No matter what the question is, the answer is always more horsepower!
Just starting out? Have a read of the getting started guide
Basic tuning of a delco ECM with $12P thread
Advanced tuning of a delco ECM with $12P thread
Just starting out? Have a read of the getting started guide
Basic tuning of a delco ECM with $12P thread
Advanced tuning of a delco ECM with $12P thread
Re: Non lock up converter idle issue
On my own car a 304 manual with a decent size cam I found decreasing the timing in the low rpm smoothed it out.
With afr still at 14.7 (verified with wideband) Each motor is different though.
With afr still at 14.7 (verified with wideband) Each motor is different though.
Re: Non lock up converter idle issue
I did both fixed the timing map and made it richer I think the timing made the biggest difference though.Holden202T wrote:what did you do, make it richer or increase the timing to stop it hunting ?
Fueling just seemed to smooth it out a lil going a touch richer.
I can drive it no problem now ,cruise at low speed and pulling up to lights it behaves great.
Nice to have it right finally was doing my head in
