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Microtech Couple Idle Questions

Old 09-30-10, 11:20 AM
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Couple Idle Questions

I have a few questions that i am just going to ask in one thread. The car is a 2005 rx8 with a newly rebuilt motor (1200 miles) and has an esmeril turbo kit running a microtech unit for engine management.

First question: when i make adjustments to the idle map in matrix mode it makes no changes to the AFR and how the car runs at idle. However, when i switch the map mode to normal and make adjustments to the idle map, all changes can be seen with how the car runs and a differnce in AFR. Why do the changes only occur when the maps are on normal instead of matrix?


Second question: Kinda has to do with question one but when in normal mode for the maps, the car has idle surge. it jumps from 880 RPM to about 1200RPM. does this constantly UNTILL the fans kick on, then it holds a steady idle. IF i am in Matrix mode, the car idles at a constant RPM all the time but is crazy rich right at around 10.3 and has a stumble to it due to being so rich. Why does it idle surge in one mode but not the other.


Third question: The car is sitting idle with the map mode set to normal. It has idle suge with AFR anywhere from 10.9 to 14.00. Fans kick on and it holds a steady idle and AFR at about 10.9. Now if i turn the headlights on, AFR goes to 11.4ish. If i turn the blower fan on inside the car, AFR goes to 12.xx if i turn the fan and air conditioning on AFR goes to 13.9. Why is it that the more electronics i turn on the AFR goes leaner.

Anyway, just a few things i noticed last night when trying to work on how the car idles. Any ideas or imput woudl be helpful. interested to hear some of hte answers. Thanks guys.
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Old 10-02-10, 10:28 AM
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You need to have the TPS set correctly and the engine at around 1000 RPM for the idle MAP in the matrix table to have an effect. Otherwise, you will be tuning the main table bins in the idle area.

If the idle is surging, then it is lean. Make sure that the bins surrounding the idle area of the map are all smooth and don't have massive changes. You probably have one very lean bin where the engine likes to idle and then other bins are much richer.
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Old 10-03-10, 09:39 PM
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you say its idleing lean, but the AFR is reading low to mid 10s when its idleing. If i go any leaner it will stall our and die.
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Old 10-04-10, 06:26 PM
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Does the alternator in the RX-8 need a PWM signal from the ECU to output the proper voltage? Many newer cars are doing this instead of relying on a built in regulator.

Have you set your base timing?

I'm amazed your car idles at 10 AFRs. The thing should be trying to die...But I still suspect the issue is with a very uneven map.
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