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FC Microtech LT12 tuning question

Old 09-03-18, 01:24 PM
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FC Microtech LT12 tuning question

I bought a FC Series 4 Turbo with Microtech LT12 (13BT engine with GT35R single turbo).
ECU is setup in matrix mode, it mostly drives fine but i'm trying to fine tune it abit.
ECU has wideband connected
I have a couple of question regarding this ECU

1. the TPScal function seems to only calibrate when i'm off the throttle, it doesn't interpolate the voltage to full throttle. Monitoring my TPS channel, it's fine when i'm off throttle, but when I get on it it's not very consistent at all, sometimes i'm physically 15% into the thorottle, but the channel would show 90%. Is this normal behavior?
My pump setting are based on MAP reading, so I guess not having full range of TPS input is ok with this ECU?

2. my idle is abit lean, I tried to richen it up by adding fuel to the cell (yellow highlight in matrix fuel table) when the car is idling, but it doesn't seem to do anything. What am I doing wrong?

3. I don't think ecu does crank tooth offset, so in the timing map, let's say the timing map is set to 6000rpm (+26), 10psi (-12), that means it's +14 to my timing at idle?

4. I"m trying to set the redline to 8000rpm. I heard the REVLIM function shouldn't be used for rotary because it only cuts half of the injectors. but I also see the previous tuner set the REVcut to 9000 rpm, which seems he's trying to avoid using REVcut too. So what is the best strategy to set the revlimit to 8000rpm?

Thanks !
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Old 09-04-18, 07:58 PM
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Originally Posted by Alpine View Post
I bought a FC Series 4 Turbo with Microtech LT12 (13BT engine with GT35R single turbo).
ECU is setup in matrix mode, it mostly drives fine but i'm trying to fine tune it abit.
ECU has wideband connected
I have a couple of question regarding this ECU

1. the TPScal function seems to only calibrate when i'm off the throttle, it doesn't interpolate the voltage to full throttle. Monitoring my TPS channel, it's fine when i'm off throttle, but when I get on it it's not very consistent at all, sometimes i'm physically 15% into the thorottle, but the channel would show 90%. Is this normal behavior?
My pump setting are based on MAP reading, so I guess not having full range of TPS input is ok with this ECU?

I have the same issue with my tps, I beleive its because its not a full sweep tps like an S5

2. my idle is abit lean, I tried to richen it up by adding fuel to the cell (yellow highlight in matrix fuel table) when the car is idling, but it doesn't seem to do anything. What am I doing wrong?

Try adjusting the inhg cells before and after on the same screen on your rpms that your idle is set to

3. I don't think ecu does crank tooth offset, so in the timing map, let's say the timing map is set to 6000rpm (+26), 10psi (-12), that means it's +14 to my timing at idle?

If your timing is set at +26 @ 6k and -12 at 10 psi, that means at 6k and 10 psi at that particular point, your timing will be +14

4. I"m trying to set the redline to 8000rpm. I heard the REVLIM function shouldn't be used for rotary because it only cuts half of the injectors. but I also see the previous tuner set the REVcut to 9000 rpm, which seems he's trying to avoid using REVcut too. So what is the best strategy to set the revlimit to 8000rpm?

This is where your ecu and my ecu differentiate, your ecu uses spark cut where as mine uses fuel cut, so for me since I premix, I use revlim so when I hit my redline, only half my injectors shut off so i still get some form of lubrication. If I used revcut, my engine wouldnt last too long due to all of the injectors shutting off at redline.

Thanks !
hope this helps some.
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