IAT mod

[bmorecam]

Don't take this too seriously but I was sitting here and thinking about the good old days and came up with this idea. I know one of our member scrming came up with the idea of moving the sensor to a cooler location in return getting positive result but what about if we let the car think is always cold like in a middle of 10* winter weather by changing the resistance on the IAT circuit to fool the ecm in thinking is winter 24 hours a day 365 days a year?

What do you guys think of this idea?

[HopeRidesAlone]

Correct me if im wrong but i thought the relocating was to get it away from the heat soak so its actually getting the real temp of the intake air.

[GretchenGotGrowl]

Yeah, don't try to fool it. Scrming's mod was because the stock airbox was hotter than ambient and so he was just allowing it to ge a more accurate reading. If you do what your suggesting the car will think it is getting more air than it really is. It will compensate by dumping in more fuel. You'll be running very rich all the time and will lose both MPG and performance.

Hope that wasn't taking it to seriously, but I don't want someone with less knowledge than you thinking it's a great idea and doing it. We'll never hear the end of the V6 that gets 14 MPG and runs the 1/4th in 16.5 seconds.

[bmorecam]

Originally Posted by GretchenGotGrowl

Yeah, don't try to fool it. Scrming's mod was because the stock airbox was hotter than ambient and so he was just allowing it to ge a more accurate reading. If you do what your suggesting the car will think it is getting more air than it really is. It will compensate by dumping in more fuel. You'll be running very rich all the time and will lose both MPG and performance.

Hope that wasn't taking it to seriously, but I don't want someone with less knowledge than you thinking it's a great idea and doing it. We'll never hear the end of the V6 that gets 14 MPG and runs the 1/4th in 16.5 seconds.

I don't think the car will think its getting more air but instead it will think its getting in denser and colder air since we are tricking the ecm to think the incoming air is just colder. If I am thinking this right the ohms changes as the weather change so for an example, what if our IAT at 32* weather see 30,000 ohms but we just wire in to make it see 30,000 ohms all day? wouldn't our vehicle operate as if we was really driving in that temperature at all times?

check this out..http://www.autospeed.com/cms/A_11035...popularArticle

[BaylorCamaro]

Well I didn't do this. However I did do what scrming did, but on my Injen intake. Before it would be a few degrees above the outside temp not it reads on average 10 degrees cooler than the outside temp. I was out driving tonight, and the outside temp was around 75 or so and my intake temp was reading around 65-68. The car def runs better than when it was in the stock area, but I think the reason behind this is because it was getting heat soaked, not it isn't.

[bmorecam]

Originally Posted by BaylorAirForce

Well I didn't do this. However I did do what scrming did, but on my Injen intake. Before it would be a few degrees above the outside temp not it reads on average 10 degrees cooler than the outside temp. I was out driving tonight, and the outside temp was around 75 or so and my intake temp was reading around 65-68. The car def runs better than when it was in the stock area, but I think the reason behind this is because it was getting heat soaked, not it isn't.

I can def understand where scrming was going with his IAT relocation mod but what if we fool the ecm to think the incoming air is cooler than actually is. The IAT is a thermocouple which increases in resistance as it gets colder and decreases as it get hotter. what if we fool the computer into thinking the IAT is reading whatever ohms our camaro see in a 20* weather and adjust the timing and fuel for a very cold intake air temperature. We all know that our car perform better in a cooler temperature and this is a fact so why wouldn't it work as long as we can get the ecm to see whatever specific base temperature we command?

Am I the only one crazy enough to think of this?

[BaylorCamaro]

I feel like the car likes the cold air because the air is actually cold and thus keeping everything else cooler. Rather than the computer "thinking" everything is cool, when in fact it really isn't. I thought the whole reason why scrming's IAT relocate worked was because the computer was getting a false reading due to heat soak right by the TB. If in fact that IS the reason then obviously it's bad when the computer thinks it's one thing when it really isn't. Hope that made sense... lol. But I don't know, I'm not an expert in these things.

[Beauwulf]

Unfortunately, unless you use an intercooler and actually lower the inlet air temps, you won't see any gains. The reason the relocation worked was that it corrected the losses from the IAT reading a higher temp than what the air actually was. It wasn't really a gain.

[BaylorCamaro]

Originally Posted by Beauwulf

Unfortunately, unless you use an intercooler and actually lower the inlet air temps, you won't see any gains. The reason the relocation worked was that it corrected the losses from the IAT reading a higher temp than what the air actually was. It wasn't really a gain.

That's what I was trying to say. Beauwulf just did a better job in less words.

[bmorecam]

I guess it really won't work come to think of it and this is why I think it won't. I think fooling the ecm to think the temp is 20* for an example will work as far as advancing the timing to a 20* temperature, but advancing the timing and fooling the ecm to think the weather is colder alone is not enough because although the ecm might think the temp is colder but the actual air going in the cylinders is not. Real colder and denser air is what will make the power

but, what if you do a complete opposite to fool the ecm to think IAT is hotter? This will retard the timing. This might work for someone using nitrous and need to retard the timing couple degrees back. One can install a switch to turn the IAT mod on and off to go hotter. It could be a useful mod at the strip.

Correct me if any of this does not make sense lol

[BSR-1]

I'm on board! You try it out and I'll copy you!

I agree with the article, it won't be a night and day difference but a gain is certainly possible.

[OOLIE]

Curious if you floated this idea past Vince and if he had any thoughts.

I figured the sensors are there to try and put the engine at optimal performance under various conditions. I know the sensors don't always work as efficiently as they should, but reading 32 in summer I would believe something has to give. If maybe you could get it to read like 10 degrees cooler than actual all the time then it may be small enough difference to give an edge but not put things too out of whack. IDK just guessing.

[bmorecam]

I tell you guys what.. if someone can find out the specific ohms resistance values for our camaro I will try this out myself and datalog the whole thing and give you my impression. It only take 2 wires and 1 dollar at radio shack and 5 min of my time. If anything don't feel or look right I can go right back to where it was. Not a big deal.

[bmorecam]

Originally Posted by OOLIE

Curious if you floated this idea past Vince and if he had any thoughts.

I figured the sensors are there to try and put the engine at optimal performance under various conditions. I know the sensors don't always work as efficiently as they should, but reading 32 in summer I would believe something has to give. If maybe you could get it to read like 10 degrees cooler than actual all the time then it may be small enough difference to give an edge but not put things too out of whack. IDK just guessing.

I talk to the guy at least once a week but never crossed my mind until today. this mod is actually proven on some cars with dyno numbers to back up believe it or not. its a old school mod, somewhat but only thing is that our car does not like too much timing. 26-28 degrees is the happy spot.