map sensor installed on the ipd plenum on mine.

theres a Facebook page that proefi has and theres many dealers and tuners on there. most any question will be answered very quickly if you post up there

 

sorry, that was my error, I meant to say IAT. IAT is fitted in the intake where the maf sensor was right?

 

Yes it can be if your MAF pipe if it is still there. Or if you are running fender intakes...you can put in one side of the turbo intakes. For the IAT, i've seen it both ways, in the plenum or in the intake side pre-turbo. I prefer to put it pre-turbo right after the air-filter because it's more accurate to ambient air temperature. Good luck man!

 

it can be fitted there but its rather useless there. IAT = intake air temp. the ambient air temp can be read off the dash and you have zero control over it. whatever the outside temp is thats the ambient temp. installing it post turbo and post i/c gives you the temp of the intake air going into the t/b. this you can control by bigger i/c or water to air i/c or meth or nitrous. by reading the ambient temp and the post i/c temp you can infer the amount of cooling your cooling mods are doing

 

IAT has influence over fueling, hotter air into the cylinders needs less fuel as it's less dense. IAT belongs post IC but not someplace where it will get heat soaked. On my Supra I had it in the TB right before the blade inside of a piece of Delrin to insulate it from the cast body. VERY accurate medical grade sensor too! The ProEFI uses VE a great deal for fueling, IAT is important and I'd want it as accurate as possible. I'll be running pre and post intercooler sensors just to measure efficiency too.

 

Hmm, I've always installed them pre-turbo in the intake pipe. Never had a problem either. It sounds like Jason from ProEFI advised br996tt it should go in the intake side, pre-turbo as well.

 

That seems a pretty weird place to put it unless heat soak is a big issue? The additional heat going through the turbo isn't going to be linear and how will you ever know when your intercooler is heat soaked or performing poorly? That doesn't sound like where I'd want it.

 

Thanks guys for your advice. I'll speak to my mechanic on Monday and confirm exactly where he now has the map and IAT sensors now. I'll repost after that. Btw I has stock air box and y pipe as these need to be stock for the Tarmac rally regs.

 

What you guys are saying makes 100% sense.... I'll check with my buddies who have the ProEFI setup on their cars to see what method they are using. Maybe I did place my IAT sensors post turbo and just can't remember... it HAS been 10 years since my last stand alone car!! :/

Edit: both my buds here who run ProEFI have the IAT after the intercooler...in a place where it will not get heat soaked.

On another note...why is the factory MAP sensor in the y-pipe? The MAP sensor from ProEFI will need to see vacuum/boost so it will need to have a signal from the plenum. If there's a idle control valve then that means that the factory map sensor did not see full vacuum assuming there's a IAC valve. Or does the TB handle idle control? Anybody know?

 

With an e-throttle there's no IAC I believe. That's a good question about locating the MAP sensor pre-throttle blade though. On the stck ECU I'm not sure what exactly the MAP sensor is used for though since it's running MAF sensed. That DOES explain why people see boost spikes when they let off the gas suddenly though and I'd never realized it! If you see big boost spikes letting off the gas check your DVs guys...