MAP sensor wiring help PLEASE!

[heinzboehmer]

Yeah you can indeed use the MAF portion of the Turner harness to tap into so you don't have to string as many wires into your DME box, if any. Its been a while since I have done this so I dont remember which pins on the unused MAF connector would be used for what.

Pretty sure the female MAF plug on the Turner harness only has three going to it (no need for the two IAT wires if you're relocating it). So you would just need to somehow connect (solder, splice, whatever) those three wires to the three wires on the MAP connector/harness and then move the original MAF wires around in the DME area to their new spots.

[Cubieman]

There's definitely a bunch of ways to slice this pie. heinzboehmer made a good point to me in that with the turner kit with the MAF Plug can chop off the MAF connector from the harness and splice the Kassel MAP harness into there. This gives you the advantage of using the pre ran wires for the MAF (the ones that go from the stock MAF plug to the plastic engine bay harness box right behind the intake) as your wires for the MAP. This makes the harness nice and clean, all wires in one conduit.

So I'm thinking while the Alpha N version doesn't have the extra plug, if you repurpose the plug on the standard IAT Turner kit with the MAF, it can lead to possibly the 'cleanest' variant of the install possible. At least this is what I have gathered so far!!

Yeah you can indeed use the MAF portion of the Turner harness to tap into so you don't have to string as many wires into your DME box, if any. Its been a while since I have done this so I dont remember which pins on the unused MAF connector would be used for what.

[BMWahba]

When you run a CSL airbox you are either running a CSL tune or Alpha N, this harness will work with either. Once you go with a CSL box regardless of CSL or Alpha N tune you are no longer using a MAF sensor so that extra port on the "standard" Turner IAT relocation harness is unused.
I REALLY wish I would have seen this MAFless version of the Turner harness because it would definitely have made my install look a bit cleaner.

To answer your question you can 100% use this product with either the Kassel or COVID-19 MAP sensor kits. Buy this Turner product w/ COVID-19's MAP sensor kit and you are good to go. The standard harness like I bought just requires you to zip tie one more thing out of the way.

There's definitely a bunch of ways to slice this pie. heinzboehmer made a good point to me in that with the turner kit with the MAF Plug can chop off the MAF connector from the harness and splice the Kassel MAP harness into there. This gives you the advantage of using the pre ran wires for the MAF (the ones that go from the stock MAF plug to the plastic engine bay harness box right behind the intake) as your wires for the MAP. This makes the harness nice and clean, all wires in one conduit.

So I'm thinking while the Alpha N version doesn't have the extra plug, if you repurpose the plug on the standard IAT Turner kit with the MAF, it can lead to possibly the 'cleanest' variant of the install possible. At least this is what I have gathered so far!!

[Cubieman]

Hey all, quick bump to this thread, just because I haven't seen this discussed too much.

Has anyone run the Turner "Alpha - N" IAT Wiring harness in conjunction with the Kassel Map or COVID-19 MAP sensor kit? Just curious as I haven't seen this discussed or more commonly mentioned. The Alpha-N variant of the IAT kit comes without the MAF plug, so is it safe to say the install is identical just cleaner since there isn't the extra MAF plug that's unused?

Here's a link to said Alpha-N harness.

https://www.turnermotorsport.com/p-5...elocation-kit/

When you run a CSL airbox you are either running a CSL tune or Alpha N, this harness will work with either. Once you go with a CSL box regardless of CSL or Alpha N tune you are no longer using a MAF sensor so that extra port on the "standard" Turner IAT relocation harness is unused.
I REALLY wish I would have seen this MAFless version of the Turner harness because it would definitely have made my install look a bit cleaner.

To answer your question you can 100% use this product with either the Kassel or COVID-19 MAP sensor kits. Buy this Turner product w/ COVID-19's MAP sensor kit and you are good to go. The standard harness like I bought just requires you to zip tie one more thing out of the way.

[BMWahba]

Hey all, quick bump to this thread, just because I haven't seen this discussed too much.

Has anyone run the Turner "Alpha - N" IAT Wiring harness in conjunction with the Kassel Map or COVID-19 MAP sensor kit? Just curious as I haven't seen this discussed or more commonly mentioned. The Alpha-N variant of the IAT kit comes without the MAF plug, so is it safe to say the install is identical just cleaner since there isn't the extra MAF plug that's unused?

Here's a link to said Alpha-N harness.

https://www.turnermotorsport.com/p-597496-alpha-n-iat-sensor-relocation-kit/

[nextelbuddy]

oscillating map signal or not, it shouldn't have a negative effect like you are thinking. the CSL Tune is still mainly Alpha N from my understanding and only uses the MAP sensor for correction factor of 3%.

Ideally you should have a tuner like Hassan from HTE in here, he tunes these all the time and makes great power and i'm sure he would know for sure.

I ran the TTFS GM 1 bar map sensor on the modified TTFS air rail when i had my airbox setup and though i never used testo to log map sensor like you guys are dong and I too also used pin 16 for my ground instead of piggy backing off pin 17, i never saw a performance issue with my stock CSL tune. just the expectation hesitation since i wasnt running the non CSL vanos cam offsets at the time.

[dl.m3]

Does anybody have the part number for the pin terminals you insert into the X60003 DME harness? Realoem has a bunch which all look the same. Lol

I don't know if my parts guy will understand what Im talking about otherwise

[heinzboehmer]

How do you guys thread the wires through the stock BMW corrugated tubing? I have a heck of a time getting it through.

I used an unbent hanger (and a ton of patience).

[cozmo kraemer]

How do you guys thread the wires through the stock BMW corrugated tubing? I have a heck of a time getting it through.

[Cubieman]

Okay, so, I'm more or less comfortable tapping into the DME wires (pin 7 and 17) for the MAP sensor, and will probably just do that, nbd. But supposing I really didn't want to touch any of the original wiring, and instead wanted to make all of my splices to the Turner IAT harness I would:

1. Tap the map ground wire into the IAT ground wire itself (which goes to pin 17 in the end anyway)
2. Connect the MAP signal wire to the unused pin 18 on the DME itself.
3. Would need to find a wire on the Turner IAT harness that is getting the same +5V power as the pin 7 wire. Is there such a wire on the Turner IAT harness?

There is a power wire on the Turner Harness as it provides power to the IAT, use a multimeter to confirm where it is. What I don't know is if it is OK to use that same wire to power both your IAT and MAP sensors. I can't see why it would be an issue but I don't know.
As far as ground goes you can either use pin 16 (unoccupied) or pin 17. As you have probably read in this thread JBfrancis had problems when using pin 16 as a ground for his IAT. But Terra is using pin 16 for his IAT and I am using pin 16 for my MAP ground with no Ill effects so far.
Pin 18 will need to go to the DME as you stated, no way around that.
I found the rear most grommet going into the DME had a lot of extra space around the wiring bundle for me to pull my wiring through.

[ATB88]

If you use the Turner IAT and use pin 16 for map ground the only wire you will tap into will be pin 7 for MAP power. This assumes you are NOT running the flap which you won't be. So don't sweat it man, use a T-tap or better yet solder it in.

Okay, so, I'm more or less comfortable tapping into the DME wires (pin 7 and 17) for the MAP sensor, and will probably just do that, nbd. But supposing I really didn't want to touch any of the original wiring, and instead wanted to make all of my splices to the Turner IAT harness I would:

1. Tap the map ground wire into the IAT ground wire itself (which goes to pin 17 in the end anyway)
2. Connect the MAP signal wire to the unused pin 18 on the DME itself.
3. Would need to find a wire on the Turner IAT harness that is getting the same +5V power as the pin 7 wire. Is there such a wire on the Turner IAT harness?

[thegenius46m]

Good to know! Confirms my other theory about the sensor based voltage. Thanks guys. Can put this to bed now that I know my wiring was done right all this time haha. Just need to find some nice hose clamps so I can relocate the Map sensor to the abs unit area.

[NZ_M3]

This is off a CSL

[NZ_M3]

Also has anyone confirmed the voltage discrepancy between the ecuworx doc and what others are posting here? I have confirmed my wiring is correct but I only get 4v at ACC where ecuworx claims it should be 5v. My friend's car gets the exact numbers but he has a gm map sensor. Looks like the bosch sensor only outputs 4.xx V from what I saw on m3cutters and another csl guide? My car seems to drive fine but after this thread I want everything 100% lol

the GM sensor has a different voltage scaling hence why it is different to the Bosch one.

what you need to do is ensure that the sensor reads atmospheric when engine is off and the number corresponds with the onboard map sensor in the dme itself - it should be virtually identical.

I’ll post up a reading from the CSL later but I have data logged this sensor despite it showing identical specs as the original and they are the same.

[terra]

Also has anyone confirmed the voltage discrepancy between the ecuworx doc and what others are posting here? I have confirmed my wiring is correct but I only get 4v at ACC where ecuworx claims it should be 5v. My friend's car gets the exact numbers but he has a gm map sensor. Looks like the bosch sensor only outputs 4.xx V from what I saw on m3cutters and another csl guide? My car seems to drive fine but after this thread I want everything 100% lol

The voltage will depend on the sensor. What’s important is that the pressure reading with the engine off is about equal to atmospheric pressure.