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idle map in matrix mode

Old 05-16-17, 01:56 AM
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idle map in matrix mode

Hi guy's am I correct in thinking the idle map table when in matrix mode actually does nothing and all correction I made on the rpm table 1000rpm and up? or does it depend where you car idles? I guess the easy answer might be do the map in the global table view I have seen before but not yet ventured into myself!?
Just for info as much as anything so I don't chase my tale on something that isn't actually doing anything!
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Old 05-17-17, 03:27 AM
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According to the manual idle map should still be the map it uses as long as the TPS is set correctly.
It sounds a little ghetto but my tuner set idle and 1000 map with same values so if the TPS wanders it doesnt cause any problems.
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Old 05-17-17, 07:30 AM
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Hmm.. Interesting. I read a few posting saying TPS does nothing in matrix mode and idle map does not impact on idle? Sure seems that when I play with the 1000rpm and 1500rpm table the idle AFR is adjusted? I can see maybe if idle is below 1000rpm it has an effect?
If you map using the actual matrix global grid which I have not delved into myself yet do I assume you just map by which ever cell is highlighted anyway and that will adjust the relevant table in the 2D graph view? i.e if it I map in full 3D matrix it will be irrelevant whether TPS is working or not as it will be showing me which cell to adjust?
The issue I seem to have when it's warm you can lean out fuel mix but during warm-up there seems to be a point around where water correction zeros off at 82degs that it becomes too lean for a couple of minutes and you need to add fuel back in the idle cells to get it to idle again. Could it be air temp correction or is there something else that can effect warm-up I have not seen? So I just want to be sure what cells I am adjusting for what!
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Old 05-17-17, 02:05 PM
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What microtech are you running? I'm running an LT8s in matrix mode and my idle is at 1k also, and with a smooth idle and no ignition break up and my afr sits right at 12.5, my timing is zeroed out on the ecu and my pulley is set a 5* advanced. My I'm constantly recalibrating my tps and it seems like its a waste of time because nothing changes with the car when I do it.

Keep in mind, anything I say about tuning is from what I have expereinced first hand, and I'm rather new at it, just to give you a heads up. Right now I'm working on getting my timing set because it's too advance in someplaces. I've dialed back from 35* advanced to 20* advanced.

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Old 05-17-17, 03:08 PM
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Thanks for reply.. I am running LTX12 ECU. The leanest I can get it to idle is around 11.9 AFR when it's hot but as soon as you start getting into 12's it leans off a dies. I am finding at that AFR it gets to a point right around where the water correction zero's out and then it goes lean and dies. like something else has switched and made it suddenly go to lean. so I have to try and fire it up and you need to give it gas to keep it running but it pops and farts and shows lean on the AFR. So you add in a couple of clicks of fuel and it's fine but the AFR is like 10.9.. After a while more running it appears you can pull that extra fuel back out and it's okay to idle around 11.9 but I have not had enough time to try stop starts and various scenarios. Really weird. Maybe due to large primary injectors but not sure.. I have 875cc ish siemens. They are better than the 1680 bosch that were there but not a huge difference. I have my timing set to the 5 deg mark with timing check on assume that is what you mean too. I think there is a couple of degrees in the timing at idle at the moment.
I need to try and log everything during warm-up and see if I can see what happens.
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