MAP sensor wiring help PLEASE!

[terra]

So pretty much the same. I'd check the other two pins on the map sensor are making good contact.

Reading change at all when you give throttle?

[Cubieman]

Swapped pins, this test was with MAP ground to pin 17 and IAT ground to pin 16:

Ignition position 2:
Igniton on (cold start):

[ATB88]

Your reading with the engine off seems fine to me. You can do a sanity check with a barometer app on your phone (and really the barometric reading from the DME is somewhere within testo too). If it's within 50 mbar of atmospheric pressure, I wouldn't sweat it.

Engine on seems is what's weird. My first thought would be a wiring issue, but I do have to wonder if the sensor being mounted basically directly to a throttle body instead of further downstream causes oscillations like that. I haven't seen others complain of that though.

Yeah I've had a curiosity in the back of my mind in the last few months as I prep for a CSL box whether putting the MAP where Kassel does might cause some weirdness in the signal since it's so close to a TB opening. I always assumed no or not appreciably because so many people seem to run it without issue, but, still, very curious.

[terra]

Your reading with the engine off seems fine to me. You can do a sanity check with a barometer app on your phone (and really the barometric reading from the DME is somewhere within testo too). If it's within 50 mbar of atmospheric pressure, I wouldn't sweat it.

Engine on seems is what's weird. My first thought would be a wiring issue, but I do have to wonder if the sensor being mounted basically directly to a throttle body instead of further downstream causes oscillations like that. I haven't seen others complain of that though.

[Cubieman]

Okay, checked my car again. I apparently have the MAP on pin 17, IAT and flap position sensor on pin 16.

Decided to do some quick logs flipping the pins around:

MAP on Pin 16 (the blip you see is me pressing the throttle for a second)



MAP on Pin 17



Both look pretty much the same to me. Engine was completely cold for the first test (pin 16) which should explain the slightly higher resting pressure.

I also checked my with my multimeter, the two pins register as continuous to each other and continuous to ground for me.

Thanks, great info there.
What do you think would be causing my readings to be bounce up and down as much as they are? Also my readings are slightly out of normal range.


I am going to swap pins so IAT would be grounded on 16 and MAP on 17 and see what happens on Testo.

[terra]

Okay, checked my car again. I apparently have the MAP on pin 17, IAT and flap position sensor on pin 16.

Decided to do some quick logs flipping the pins around:

MAP on Pin 16 (the blip you see is me pressing the throttle for a second)



MAP on Pin 17



Both look pretty much the same to me. Engine was completely cold for the first test (pin 16) which should explain the slightly higher resting pressure.

I also checked my with my multimeter, the two pins register as continuous to each other and continuous to ground for me.

[Cubieman]

So after testing my MAP sensor with Testo I think there may be an issue with using pin 16 as a ground after all.
The car seems to run fine and holds idle, smells richer than before I did all this but thay may be from the tune.

Findings:

When ignition is in position 2 the voltage reads 3.9v instead of 4.9-5 and pressure reads 970mbar

When started the voltage swings 0.9-1.4v and pressure swings from about 230-350mbar.

When I look at the voltage line on my read out it consistantly swings up/down much more than the screenshot I see on Ecuworks.com.

Ecuworks.com info for reference:

https://www.ecuworx.co.uk/2016/03/15...g-a-csl-clone/
Maybe I need to tap into pin 17 and see what happens then.

Would it be alright to use pin 17 for both IAT and MAP? Pin 17 provides ground for my IAT via a Turner IAT relocation harness. The Turner harness plugs into where the MAF was and pin 17 provided ground to the MAF.

Pic of the car idling (cold start):

[Cubieman]

Well I ended up using slot 16 for the MAP sensor ground and the Turner relocation harness has the IAT hooked up. Car starts and idles, haven't tested it yet and I couldn't get Testo to work to test the MAP sensor. However when I first started the car it started then immediately died. I had forgotten to plug in the connector to the MAP, after this the car started up. Don't know if that could be an indication the sensor is good to go or not.
Anyways, just about to go for the first drive, wish me luck..

EDIT: Holy s**t does this car pull now, and that sound above 4K is INTENSE. A few things about the tune I might have changed but all in all this is bad F'n ass!!!

[Cubieman]

Looking good! I thought u had a TMS airbox coming?

I do have a Turner box comming, I got impatient and also got a bit worried about the untested Turner box. This is so much work I figured I wanted to use a tried and true product, although it cost me a LOT more.

I also wanted the ability to run a snorkel as I worried about the Turner box sucking too much hot air.

Once my Turner box arrives I'll be selling it at the GB price.

[Cubieman]

Maybe this will help a little?

https://www.youtube.com/watch?v=1VWGQ71_gQk

Awesome, thanks!

[Epsilon]

Maybe this will help a little?

https://www.youtube.com/watch?v=1VWGQ71_gQk

[COVID-19]

Looking good! I thought u had a TMS airbox coming?

[Cubieman]

[Cubieman]

Well its coming together...

[Steve]

So when you say you wired the MAP to the Turner harness did you just open it up and splice in power/ground?

I cut off that connector and wired it to the appropriate places.