ECMlink Its been a minute… MAF setup Log for review

[Justin DuBois]

For you inquisitive type, I’ve got this setup running well, but it needs some tweeks to get dialed in.

Check my vehicle for the specs - only difference here is the Big16G, factory airbox and a 2.5” cat are in place for emissions testing.

For emissions testing I opted to switch back to MAF mode, and started dialing in boost control and maf comp.

Boost control is set manually by the duty cycle table, I am trying to hold 15-16psi to redline. Error correction is off so the target psi table is ignored.

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MAF comp - Its roughed in, too rich mostly. I’m trying to lean things out higher on the hz scale. I’ve never hit these parts of the hz scale before, so the flow from the e3 mods must be helping.

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So, tell me what you see? What moves would you make next?
(log to be added)

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[Stapl3]

Post a log man I'll happily go through it.

First thing I see from your pictures is all the removed airflow. If you're constantly removing that much, in reality your fuel system is miscalibrated rich, therefore you're using the airflow sliders as fuel sliders to remove airflow [ahem, fuel]. ~-20% wew, something is off fuel-wise.

Your TPS is not hitting 5v at WOT. Adjust it.

You are rich, but consistently through the pull, which is good. The ECU is expecting 10.3 but you're at 9.6. You can adjust the global OR simply give the afpr about a half turn counter clockwise.

Keep in mind what I said just above that you are rich AND from my previous post you're pulling ~20% airflow to remove fuel. You're rich dude.

I would make a guess that you could zero out your mafcomp sliders and give your afpr a full turn counter clockwise and be looking very good. I would try this out if I were you, and you can so easily revert back to where youre at if unhappy.

 

[Justin DuBois]

Posted.

The current Global Fuel is set based on my SD setup for 24psi

Yeah, for this boost level, global fuel maybe.

Your TPS is not hitting 5v at WOT. Adjust it.

You are rich, but consistently through the pull, which is good. The ECU is expecting 10.3 but you're at 9.6. You can adjust the global OR simply give the afpr about a half turn counter clockwise.

Yeah, 2G TPS sensor on a 1G TB, has limits - but I'll see if I can compensate with ECMLink TPS adjust.

I don't have an adjustable FPR, I monitor FP on the dash, but it's not in the logs sadly. Stock FPR.

Oh, and don't be too impressed with the consistency of the 9.6 AFR- that's pegged off the scale. I need to lean it out way more at this boost level just to get the needle off the floor.

 

[Stapl3]

When the fuel system is calibrated correctly, it does not matter what boost you run because you're not using ridiculous airflow adjustment to counteract it. Your mafcomp doesn't magically get perfect at 2200hz, you just don't get to the point. If you ran a big turbo at high boost your mafcomp slider would be down all the way across the table.
I can run 15psi or 45psi and it's accurate. If i want a/f to be 9.3 or 12.3 I simply put those number in the DA table and that is what I get. Fuel calibration is so damn important on these cars and everyone skips it because adjusting airflow is ezpz.

My 91 talon has a 16g in upper 20s and I changed 2 cells from stock in the SD table I think half a point. You're 20% off with your airflow and it's still half point rich. It's wrong.

 

[habitatguy187]

If the maf is only for emissions testing, why not just hook it up visually yet still run the car off your sd tune?

 

[Justin DuBois]

If the maf is only for emissions testing, why not just hook it up visually yet still run the car off your sd tune?

I have not tried that yet. The two test points I know of on a 95 AWD are emissions at idle - below 900rpm, with timing ~5deg, and then no load emissions at 2500rpm, plus what ever engine configuration items they want to care about. A stock intake - and the chassis matching CAT part number are the two things that I have had to address in the past. I know they check that the gas cap seals, and technically, I think they are supposed to manually check that the EGR diaphragm is intact with a vacuum pump.

 

[Justin DuBois]

I'm open to trying a reset.
Attached please find a result with MAF comp zero'd out, and the global fuel set to a generic starting point. TPS has been adjusted via TPS adjust in ECM Link. The TPS sensor on the TB is at its adjustable limit.

Not Rich anymore - and the only reason you don't see massive knock issues is because I'm running E25

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[Stapl3]

You're a full point lean, but again it is consistent which is great. Adjust the global OR base fuel to richen it up.

To be clear, what I'm looking at it in the log is when you're WOT, I'm simply comparing afratioest to linwideband. You want these two values to match during the wot, specifically at about 5500rpm. But again, you're very consistent so I don't think you'll need much of mafcomp to dial it in before and after 5500rpm.

 

[Justin DuBois]

1 move later...That's more like it

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[Stapl3]

Heck yeah! So much better. Your fuel system is now calibrated pretty damn close. Also notice how your boostest=actual boost, awesome. The trick is to have afratioest=linwideband at ~5500rpm AND while having your mafcomp slider at that hz be zero, that is the sign of a perfectly calibrated fuel system. If that is the case, and it is, any other slider left or right of that 5500rpm slider you can adjust all you want guilt free to get afratioest=linwideband. You're now using the airflow adjustments to adjust airflow as intended. You will now see that your hp and tq values are accurate, your airflow value is accurate, if you want to target a certain a/f ratio on the DA table it will give you want you want. This is big time, you've got it better than 99/100 logs I've looked at. Excellent work.