RomRaider

What about another areas above idle. New scaling is with low values.

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How about you try it and see. I think you'll find it more accurate across the board.

Hey,

So none of these gave me result that I would qualify of "good". low flow seems far off in the first one and the second isn't great at higher flow.

with adequate fuel map its not that bad, but I still have to change ipw +/-10% discrepancies at higher load and +/- 20% at lower loads.

End of the day no MAF is the same and no build is the same.
I'm using the new scalar with good results on an e46 turbo and continue to fine tune it.

for reference, I swapped one Hitachi maf today that was reading around 1.15v at idle for another that was apparently exactly the same, which now reads around 0.89v at idle.

not all knock off mafs are made the same. at any rate I expect to have a usable scalar defined tomorrow evening for the new maf, bearing in mind that I'm tuning the curve using 60lb Bosch ev14 injectors so YMMV.

Could you please elaborate the process of maf scaling ?

Mine is a genuine hitachi one I believe. I'm down to learn how to make the scaling myself.

v8 updated after several days of testing on my e46 330i turbo.
I'm pretty happy with revisions 2 & 3 as they're proving pretty consistent.

In terms of scaling a maf, pretty simple.

The 10 second explanation is you only need to log a couple of parameters. RPM, MAF V and AFR. Make sure the DME is fixed in Open loop and do lots of logging. Calculate the average difference between stoich and the logged AFR for each MAF V logged and adjust the MAF value in the scalar by the required amount. Make sure to smooth out as required so no increase in MAF V has

This can also be done using STFT instead of AFR.

Download the Maf Scaling 2.4.2 java application and this will really help the process.

Thanks for the explanation. I'll look into this.

For me, the V7 scaling required adjustment of the fuel, but after it the car rides well, does not register knocks, so there is still room for acceleration of ignitions. With the V7 I am happy, I have a Hitachi MAF stock with a factory housing and a 2.2Kohm resistor. Fuel corrections were not cosmic.

So I've turned my head around this, injector pw should come into play also here ?
What do you use for base fuel table during scaling ?

if you haven't changed injectors, it's irrelevant.
if you changed injectors, scale the fuel tables by the % difference in size, and set the deadtimes to match new injectors.
then do the above. once you have a good maf curve, then you can fine tune injection tables.

new injectors indeed and e85.
Cheers

Anyone else tested the 540maf from m62tu? It's also used in 4.8litre v8 engines which have 370hp and uses 3.5" housing as euro s50 maf. BMW part number 13621433567 and Bosch 0280217814

Bit interesting to wire, because it has 5 wires and the fifth one is +5v reference from ecu. But damn according to my logging and calculations it should flow up to 1600kg/h and still seems pretty accurate down low. And those can be bought for dimes as used. And new genuine Bosch is like 150usd.

Has anyone used the integrated IAT sensor on the 350z maf? I assume If they’re the same type of sensor as the stock M52 IAT sensors, it should work with a rescale.

The resuscitation of the IAT sensor in my romraider did not work in ECU MS41.0. I do not remember exactly in which case, but I gave up the subject and to the collector M50b25 I mounted a sensor of Siemens, which had the same values ​​as the one from M52.