Congrats Jordan, and glad you got the MAF/Unichip sorted. Proper tuning pays big ;)
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Unichip and HFM installed and tuned, dyno results.
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Air temp sensor
Very interested in your results.
From the photos of your project it looks like you added the OE temp sensor (from inside the AFM) to the harness for the MAF. Did you salvage this sensor from an AFM or buy it new somewhere? If the latter, may I ask for the P/N and source?
Where did you mount the temp sensor? In the elbow?
Many thanks.
Mike AMike A
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The temp sensor was salvaged from a dead AFM. I do not think you can buy it seperately.
I drilled a 1/2in hole in the intake pipe (before the HFM) and mounted the temp sensor there with a tight fitting gromet.Tenured Automotive Service Professional - Avid BMW Enthusiast
Vapor Honing & E30 ABS Pump Refurbishment Service
https://mtechniqueabs.com/
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Thanks for the very speedy reply, Jordan.
I have 3 working AFM's (M20 and M30) but it seems a shame to waste one. I guess I could shop for a dead one or even get one free somewhere.
Nonetheless I am going to continue contacting some service centers I located and see what I can find.
Mike AMike A
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If the board is out you can't miss the sensor. It goes down through the "floor" where the board mounts, and into the AFM tunnel. Its at the very front of the AFM inlet sticking in the air path.
It is held in with 2 rivits, just drill them out and gentley pry it out with a small flathead.Tenured Automotive Service Professional - Avid BMW Enthusiast
Vapor Honing & E30 ABS Pump Refurbishment Service
https://mtechniqueabs.com/
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If someone uploads a picture, I have one M20 AFM I pulled the electronic board out of, and another I am about to, so I might be able to help you out.
As I understand it, these rarely if ever fail on the Bosch unit so they are likely to be just fine. There are differences in ohms/deg calibration for different models AFMs but it should not be an issue for M20's or even M30's.
Thanks!
Mike AMike A
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This is off be-boarded M20 AFM #1. The 2nd just arrived this week and I haven't cracked it open yet.
I actually would desire your M30 AFM if you could part with it. Whats the PN btw? I could send you the two temp sensors + $ for the M30 AFM.
Let's reply from now on in PMs to not further hijack Jordan's thread. Thanks for your help J.
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Originally posted by JordanThe temp sensor was salvaged from a dead AFM. I do not think you can buy it seperately.
I drilled a 1/2in hole in the intake pipe (before the HFM) and mounted the temp sensor there with a tight fitting gromet.Euro M3'87 NogaroSilver/Euro E34 M5 '93/Porsche 993 TT 97' Euro/Porsche 993 Carrera 95' Euro/Skyline R33 GT-R
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I don't have a MAF, I have a HFM.
And while it does somewhat resemble the function of a temp sensor it isn't usable as one.
The factory temp sensor and wiring must remain intact.Tenured Automotive Service Professional - Avid BMW Enthusiast
Vapor Honing & E30 ABS Pump Refurbishment Service
https://mtechniqueabs.com/
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Originally posted by JordanI don't have a MAF, I have a HFM.
And while it does somewhat resemble the function of a temp sensor it isn't usable as one.
The factory temp sensor and wiring must remain intact.Euro M3'87 NogaroSilver/Euro E34 M5 '93/Porsche 993 TT 97' Euro/Porsche 993 Carrera 95' Euro/Skyline R33 GT-R
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You may need the air temp sensor for the reference value with an MAF. It is part of the calibration. Not all MAFs are alike though and some need a temp signal for reference.
More importantly, when you convert from AFM to MAF or even HFM your DME is still expecting the reference air temperature since it does not know how to read units of "mass." A piggyback system is supplying signals converted to the DME to simulate volume.
If you simply disconnect the air temp sensor, I expect the DME will be very unhappy to receive 0 volts where it expects to see a signal proportional to temperature. A negative temperature coefficient sensor with an output of 0 ohms (or 5 V) would correspond to extremely high temperature (higher temp -- lower resistance). An aftermarket temp sensor could be used but it would have to exactly match the range of the OE or be fed to a piggyback that could map the values correctly.
Diego: I spent a lot of time climbing around the Peruvian Andes. Do you also have an M6 as your username implies? If so that must be an incredibly rare car on HWY 1.Mike A
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