Putting a resistor in the IAT sensor
Thread Starter
Burning Brakes
Joined: Jun 2002
Posts: 1,037
Likes: 31
From: Richmond Texas
Putting a resistor in the IAT sensor
Hey yall. I was reading a list of free mods at installuniversity.com and they were talking about putting a 4.7k 1/2 watt resistor in the connector of the IAT sensor. They said it bumps timing up to 1.5 degrees. Any of yall ever heard of this or done this? Think the extra 1.5 degrees would be worth it? I think I might try this on dad's car just for the fun of it. Thanks yall.
Melting Slicks
Joined: May 1999
Posts: 2,573
Likes: 0
From: Tewksbury MA
Re: Putting a resistor in the IAT sensor (BigBlue)
Yes you can add a resistor to fool the PCM by thinking that the air is colder or hotter. I use it only for N20 to retard the timing while running a 100 shot.
I tried it a few times by advancing the timing on a NA run and didn't see much of a difference. Just monitor your knock retard values if you advance the timing.
I tried it a few times by advancing the timing on a NA run and didn't see much of a difference. Just monitor your knock retard values if you advance the timing.
Racer
Joined: May 2001
Posts: 304
Likes: 0
From: Bryn Mawr PA
Re: Putting a resistor in the IAT sensor (BigBlue)
IMO you are asking for big time detonation if your car is a 1999 or up. I tried this mod on my 99 FRC and had huge detotation at 5600 and up. Went back to the standard set up and it was gone.
Using ATAP, I found max advance is usually around 28.5 or 29 degrees and no more.
Using ATAP, I found max advance is usually around 28.5 or 29 degrees and no more.
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Burning Brakes
Joined: Nov 2000
Posts: 832
Likes: 0
From: Joplin Mo
Re: Putting a resistor in the IAT sensor (C5 YA)
What value would you need to retard the timing around 4 degrees and where do you hook the resister in at? Does it go in series and just piggyback or parallel two of the wires? I had my PCM reprogrammed and has about 4 degrees advanced in the programming. I was told I need to at least take that much back out when running nitrous. I've heard the resister trick will work and save from having to plunk down another $270 for a timing module. :rolleyes: Anymore info on this guys?? :cheers:
Thread Starter
Burning Brakes
Joined: Jun 2002
Posts: 1,037
Likes: 31
From: Richmond Texas
Re: Putting a resistor in the IAT sensor (MikeyD)
All you do is unplug the electrical connector, insert the resistor into the eletrical contacts, and tape it in. That's how you hook it up. As far as resistors go, I guess go and by a bunch and just start playing with them. Make sure you have some kind of software to be able to read the knock retard and stuff like that.
