IAT sensor in cold fmic pipe

[byohndspeed]

i just relocated the iat sensor to the cold side pipe. seems to have made the car run richer. smoothed out the idle alittle. cant really tell much on the butt dyno, seems to have alittle more bottom end torque. i used a 1 1/8" bolt and nut with a big washer. i used a rubber o-ring under the sensor to seal it from leaking. i checked for leaks and there wasnt.

 

[MazdaSpeedTurbo]

how that working out for ya? looks like you painted it... the iat on coldside.. hmmm i dont know..

 

[Spooled]

That's probably the best place to put it... if you can tune you timing and fuel to take that into account. It will give you the most accurate input since it's right before the throttle body. You just need to compensate for the higher temp readings so that the ECU doesn't pull too much timing or add too much fuel.

Does anyone know the operating range (temp and voltage) of the IAT? Hopefully it doesn't get inaccurate or max out when it reads the higher temps.

 

[byohndspeed]

well, i am keeping the boost down untill i get dsm's afc. then i will get a wideband and take it to the dyno and then tune.

 

[Brian MP5T]

Subscribing

 

[genius]

i just relocated the iat sensor to the cold side pipe. seems to have made the car run richer. smoothed out the idle alittle. cant really tell much on the butt dyno, seems to have alittle more bottom end torque. i used a 1 1/8" bolt and nut with a big washer. i used a rubber o-ring under the sensor to seal it from leaking. i checked for leaks and there wasnt.

That's good work. I never bothered with the idea myself, always afraid of the IAT shooting out of the pipe during boost.

 

[byohndspeed]

it was really easy to do. i cut the bolt with my chopsaw then put it in the drillpress and drilled it out, then welded it to the pipe. as for the top, got a washer that just fit the top of the nut, drilled it out enough for the sensor, then welded that. then cut the washer down so i could tighten it. and thats all. took about an hour or so. the sensor sticks in the pipe anout 3/4 of an inch. now i need to save for the afc and wideband.

 

[byohndspeed]

That's probably the best place to put it... if you can tune you timing and fuel to take that into account. It will give you the most accurate input since it's right before the throttle body. You just need to compensate for the higher temp readings so that the ECU doesn't pull too much timing or add too much fuel.

Does anyone know the operating range (temp and voltage) of the IAT? Hopefully it doesn't get inaccurate or max out when it reads the higher temps.

i cant see it beeing out of its range or even beeing that much hoter than where the factory puts it. i took my car on a trip over the weekend and it was about 2 hrs one way. the coldside pipe was still cool to touch, not warm at all. could never do that with the stock airbox. plus the stock airbox, with the elbow, still drew in air from the engine bay. i know its not as bad as just a cone filter on the end, but it still got its air from inside.

 

[jeffmsp]

sounds like a good idea to get more accurate readings. You should hook up a digital multimeter and see what kind of voltage its putting out to compare to someones in the stock location. IAT sensor relocation definately makes a noticable difference, putting mine in the CAI makes the car quite different then in the hot engine bay.

 

[Spooled]

i cant see it beeing out of its range or even beeing that much hoter than where the factory puts it. i took my car on a trip over the weekend and it was about 2 hrs one way. the coldside pipe was still cool to touch, not warm at all. could never do that with the stock airbox. plus the stock airbox, with the elbow, still drew in air from the engine bay. i know its not as bad as just a cone filter on the end, but it still got its air from inside.

I didn't see that you have the HiBoost FMIC. That probably makes it much more appropriate for the IAT sensor to be there.

 

[Rainman]

Excellent job. I was contemplating how to do this myself. I'll have to do this over my holiday over the next few weeks.

R

 

[byohndspeed]

well its been 2 days now and still running great. this could just be me, but i think my exhaust got quieter at highway speeds..

 

[byohndspeed]

UPDATE: 300 miles and still good. it definately runs smoother..

 

[Spooled]

UPDATE: 300 miles and still good. it definately runs smoother..

Good to hear! Maybe this needs to be an option on IC kits along with a MAF relocation option.

 

[jtmp3]

I have my maf and iat on the cold side of the ic about 12" from the tb, any problem with this???I have a fmic and 3" turbo back exhaust on a mp3 with msp swap including unflashed ecu. any opinions.

 

[2K3 MSP]

I have the DSM a/f controller, but it's still on the base map, and I'm running 11 psi(mods in sig) Will this do me any good to relocate it without tuning the a/f controller?

 

[byohndspeed]

i dont think i would move it without retuneing it.

 

[shane02pro5]

Bringing this back from a while back!

Did you have a wideband to note the difference? I have a wideband and a J&S Timing control and Haltech with my Hiboost Kit, but have always had idle issues. I am always dipping to 10's and lower under WOT. I plan to get some tuning done in the near future but want this done first.

i dont think i would move it without retuneing it.

 

[shane02pro5]

It just occurred to me that since my Haltech uses it's own IAT sensor located on the Cold Pipe and its own MAP sensor my MAF is most likely only there to satisfy the stock ECU and not throw a CEL. So in that case relocation would do nothing for me.

Can anyone confirm this?

 

[shane02pro5]

Bump! Anyone??