IAT Switch?

Debose · 07-22-2004, 06:37 PM

Hi, thinking about doing IAT mod but don't know to much about it yet, still looking at posting and info on it and just wondering... this looks like a drag strip only mod and I have a 99 GA GT1 witha few mods CAI, ported MAF, ported intake a few others and I use this car for every day driving with a few light to light races so this sounds like not a good mod for me unless...
Would adding a switch so I could just turn it off when I wanted to disable the IAT sensor be possible? I know I would get a SVS light once the switch is flipped but the light should go out when I turn the switch back ..wouldn't it?
basically I would just splice a length of wire into one of the wires to the IAT sensor and add a toggle switch inside the car somewere so I could have control of IAT at flip of a switch..
could this work?

IanGT99 · 07-23-2004, 09:20 AM

I don't believe this could work. With the IAT mod, you don't just simply unhook the wires, which, with a switch, is what you would be doing in essence. You have to put a resistor (about $0.30 at Radio Shack) in the end of the IAT harness itself to trick the computer into thinking the air coming into the manifold is a constant 32 degrees. When that happens, the computer overcompensates by putting more fuel into the engine to make a rich condition. More fuel = more kick. It's not much kick at all, but it is a good little drag trick to do as it helps with low end torque a bit. If you drive around with it all the time, you'll get EXTREMELY bad gas mileage. I did a test a few months ago with this. I drove around normally using one tank of gas first with the IAT mod, then without it. I got 210 miles with it on, and 290 without it on. With gas prices the way they are, I don't think you'd wanna do that. It's not hard and seriously takes 2 minutes to take on and off. Hope that helps...

Craig99SE2 · 07-23-2004, 09:57 AM

All you need is a double-pole, double-throw switch. Take the 2 wires from the harness to the middle terminals. Put the sensor on one end pair of terminals and the desired resistor across the other end. Done.

Anyway, the cost of the parts would not be worth the whole 1 or 2 HP you'll get from it anyway.

IanGT99 · 07-23-2004, 01:18 PM

Ah, this is true. I stand corrected. Like Craig said, though, the cost of the parts and the time it would take to install almost wouldn't be worth it. Just take a few minutes and do it manually when you want to race the car.

Schweppe23 · 07-24-2004, 12:30 AM

kinda similar to a happy knob, right?...allowing you to 'dialing in' more timing (and some minimal fueling) by telling the comp that its cooler via iat.

http://www.zzperformance.com/zzp/pro...t_selector.htm

ian99gt....as for getting much worse fuel economy with this mod i have to disagree, when using this on my custom dhp...my mpg suffered no ill effects.

Debose · 07-24-2004, 02:51 PM

ahh I kinda understand now, thanks guys..
so I do need the little resistor because I thought it was just for keeping the SVS from going off but I understand it's actually needed for this to work..cool
I know it's not going to add much horse power at all but I look at it as.."it's just something to do that will make a tiny difference".... I get bord and these somewhat easy little inexpensive mods are just fun to do while saving pennys for more expensive stuff.
just thought about this because back in my Probe GT days the club guys were always talking about the IAT switch mod and how it made the cars at a flip of a switch go from doing a tiny struggeling cherp to getting a few seconds of nice screetch and setting you back in your seat. from what I remember there was never a resister envolved, just cut n splice in your switch. seems our GA's require a little more to it than that.
thanks for the how too Craig.. does there happen to be a detailed how to in any postings anywere for the IAT with switch setup? i'm not much of an electrician but can follow detailed instructions.
which resistor and wiring it and the sensor to the switch is my bug.

IanGT99 · 07-25-2004, 06:23 PM

Quote:

Originally Posted by Schweppe23

ian99gt....as for getting much worse fuel economy with this mod i have to disagree, when using this on my custom dhp...my mpg suffered no ill effects.

Really? Mine SUCKED with the IAT mod done. Do you think it would have something to do with you having DHP as opposed to me not having DHP? Maybe the reprogram makes up for something like that...

phantom505 · 07-25-2004, 06:31 PM

If I recall it's a 3.3kohm resistor for 32*F, right?

IanGT99 · 07-25-2004, 06:45 PM

Quote:

Originally Posted by phantom505

If I recall it's a 3.3kohm resistor for 32*F, right?

That is correct.

07-22-2004, 06:37 PM	#1
Debose GAGT - Newbie Join Date: May 2004 Location: Kansas Age: 48 Posts: 11 Vehicle: 1999 Grand Am GT1	IAT Switch? Hi, thinking about doing IAT mod but don't know to much about it yet, still looking at posting and info on it and just wondering... this looks like a drag strip only mod and I have a 99 GA GT1 witha few mods CAI, ported MAF, ported intake a few others and I use this car for every day driving with a few light to light races so this sounds like not a good mod for me unless... Would adding a switch so I could just turn it off when I wanted to disable the IAT sensor be possible? I know I would get a SVS light once the switch is flipped but the light should go out when I turn the switch back ..wouldn't it? basically I would just splice a length of wire into one of the wires to the IAT sensor and add a toggle switch inside the car somewere so I could have control of IAT at flip of a switch.. could this work?

07-23-2004, 09:20 AM	#2
IanGT99 GAGT - Senior Member AKA: Ian Join Date: Apr 2003 Location: Moon Township, PA Age: 38 Posts: 1,880 Vehicle: 07 Honda Ridgeline RTL	I don't believe this could work. With the IAT mod, you don't just simply unhook the wires, which, with a switch, is what you would be doing in essence. You have to put a resistor (about $0.30 at Radio Shack) in the end of the IAT harness itself to trick the computer into thinking the air coming into the manifold is a constant 32 degrees. When that happens, the computer overcompensates by putting more fuel into the engine to make a rich condition. More fuel = more kick. It's not much kick at all, but it is a good little drag trick to do as it helps with low end torque a bit. If you drive around with it all the time, you'll get EXTREMELY bad gas mileage. I did a test a few months ago with this. I drove around normally using one tank of gas first with the IAT mod, then without it. I got 210 miles with it on, and 290 without it on. With gas prices the way they are, I don't think you'd wanna do that. It's not hard and seriously takes 2 minutes to take on and off. Hope that helps... __________________ Tire Size Calculator

07-23-2004, 09:57 AM	#3
Craig99SE2 Mr. Know It All AKA: Craig Join Date: Aug 2002 Location: Commerce Twp., MI Age: 48 Posts: 1,349 Vehicle: 1999 Grand Am SE Coupe	All you need is a double-pole, double-throw switch. Take the 2 wires from the harness to the middle terminals. Put the sensor on one end pair of terminals and the desired resistor across the other end. Done. Anyway, the cost of the parts would not be worth the whole 1 or 2 HP you'll get from it anyway. __________________ Project 13-Second NA GASE - 1999 Grand Am SE - RSM Heads,UIM,LIM,62mm TB,AFE Filter,RSM WAI,TOGs,DynoMax Hi-Flo Cat,SLP,DynoMax,ASE Chip,Mobil 1,Accel DIS,Taylor Wires,Denso Iridium,Hyper Ground,FFP Pulley,B&M SuperCooler,RedLine D4 ATF,Poly Drivetrain Mounts - Estimated 250HP ... Dyno Charts Soon!

07-23-2004, 01:18 PM	#4
IanGT99 GAGT - Senior Member AKA: Ian Join Date: Apr 2003 Location: Moon Township, PA Age: 38 Posts: 1,880 Vehicle: 07 Honda Ridgeline RTL	Ah, this is true. I stand corrected. Like Craig said, though, the cost of the parts and the time it would take to install almost wouldn't be worth it. Just take a few minutes and do it manually when you want to race the car. __________________ Tire Size Calculator

07-24-2004, 12:30 AM	#5
Schweppe23 GAGT - Senior Member Join Date: Sep 2002 Location: Ohio Age: 41 Posts: 1,549 Vehicle: Pontiac	kinda similar to a happy knob, right?...allowing you to 'dialing in' more timing (and some minimal fueling) by telling the comp that its cooler via iat. http://www.zzperformance.com/zzp/pro...t_selector.htm ian99gt....as for getting much worse fuel economy with this mod i have to disagree, when using this on my custom dhp...my mpg suffered no ill effects. __________________ First 99+ GAGT to run 14s First E/M (only) GA to run 13s First turbo'D GAGT to run 12s 11's coming soon

07-24-2004, 02:51 PM	#6
Debose GAGT - Newbie Join Date: May 2004 Location: Kansas Age: 48 Posts: 11 Vehicle: 1999 Grand Am GT1	ahh I kinda understand now, thanks guys.. so I do need the little resistor because I thought it was just for keeping the SVS from going off but I understand it's actually needed for this to work..cool I know it's not going to add much horse power at all but I look at it as.."it's just something to do that will make a tiny difference".... I get bord and these somewhat easy little inexpensive mods are just fun to do while saving pennys for more expensive stuff. just thought about this because back in my Probe GT days the club guys were always talking about the IAT switch mod and how it made the cars at a flip of a switch go from doing a tiny struggeling cherp to getting a few seconds of nice screetch and setting you back in your seat. from what I remember there was never a resister envolved, just cut n splice in your switch. seems our GA's require a little more to it than that. thanks for the how too Craig.. does there happen to be a detailed how to in any postings anywere for the IAT with switch setup? i'm not much of an electrician but can follow detailed instructions. which resistor and wiring it and the sensor to the switch is my bug.

07-25-2004, 06:31 PM	#8
phantom505 GAGTurbo Owner Join Date: Nov 2002 Location: Heltonville, IN Age: 41 Posts: 1,576 Vehicle: '02 GAGT	If I recall it's a 3.3kohm resistor for 32*F, right? __________________ It's ugly, and turbocharged! 264 HP and 284 ft/lbs at the wheels(@9psi), power curve like none other! And the transaxle to make it all work!

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