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Odd AFR lean spike at idle... tune and log attached
Posted: Fri Oct 12, 2012 4:47 pm
by kccampro
I'm getting close with my tune but there are still a few issues. My RPM at idle still hops around a little and I'm getting a odd super-lean spike in my AFR with no corresponding change in my MAP. Take a look at the log around 78 seconds... not sure whats causing it. Also, this is my first time posting a tune or a log so if you see something that looks odd please let me know.
Re: Odd AFR lean spike at idle... tune and log attached
Posted: Sat Oct 13, 2012 3:14 pm
by WASyL
After opening your MSQ i got this message:
1 Warnings:
Warning: MSQ Units Mismatch for fRate! cc/min found in current configuration, g/s found in MSQ, values were not converted to new units.
Are You sure that this one is set correctly
For TPI IAC in Idle menu 100 steps is quite low value, usualy You use 140-160 steps as starting point in Start Value.
In Injection Control i found injectors 30's rather then 24's as your signature states.
You set Trigger Offset at 0? is that also on engine(distributor)
IAT Steps at Other Tuning are way off dorm IAC settings of 100 mentioned earlier
best regards
Re: Odd AFR lean spike at idle... tune and log attached
Posted: Mon Oct 15, 2012 2:21 am
by kccampro
WASyL wrote:After opening your MSQ i got this message:
1 Warnings:
Warning: MSQ Units Mismatch for fRate! cc/min found in current configuration, g/s found in MSQ, values were not converted to new units.
Are You sure that this one is set correctly
For TPI IAC in Idle menu 100 steps is quite low value, usualy You use 140-160 steps as starting point in Start Value.
In Injection Control i found injectors 30's rather then 24's as your signature states.
You set Trigger Offset at 0? is that also on engine(distributor)
IAT Steps at Other Tuning are way off dorm IAC settings of 100 mentioned earlier
best regards
Thanks for the feedback, it's always nice to have someone else look through the tune to catch what I have missed. Starting from the top:
The unit mismatch, is that jus a difference between your settings and how I have my tune configured? I don't recall having cc/min in my tune.
IAC setting is at 100 because those motor (and cam) seems to like a fair amount of air at start up. I have tried higher step values but it starts better with the value set to 100.
I didn't see anything under injection control that stated 30 lbs injectors so I will have to take a look again. You are correct, I am running 24 lbs injectors as my signature states.
Trigger offset set to 0 because I was (before this weekend) running a mechanical distributor with vacuum advance. I have just recently converted to the HEI and my trigger offse is 10 degrees.