Another addition to the IAT resistor dispute
#1
Member
Thread Starter
Join Date: Apr 2001
Location: East Windsor, NJ, 08520
Posts: 400
Likes: 0
Received 0 Likes
on
0 Posts
Car: 2002 Harley Nightrain
Engine: twin cam 88ci
Transmission: manual
Another addition to the IAT resistor dispute
I know that the most accurate thing to do is to use my OEM sensor. BUT- my sensor got damaged and I need to put a resistor in it's place. Now, I have already spoken to a few people about the ohm values and their effect on the computer. We all know that it will run lean with a hot resistor, and rich with a cold one. Snflupigus posted a nice table that gives the resistance of the sensor at certain temperatures. According to that,
.185k ohm= 210*
.45k ohm= 158*
1.8k ohm= 104*
3.4k ohm= 68*
5.7k ohm= 53*
7.5k ohm= 32*
13.5k ohm= 14*
I intend on having (2) resistors. One for street/track use. And one for going through inspection every two years. Obviously inspection=lean (maybe a .45k ?), and I assume maybe a 5.7 (+/-.3) would be good for street use. What does everyone think? Thanks -Randy
.185k ohm= 210*
.45k ohm= 158*
1.8k ohm= 104*
3.4k ohm= 68*
5.7k ohm= 53*
7.5k ohm= 32*
13.5k ohm= 14*
I intend on having (2) resistors. One for street/track use. And one for going through inspection every two years. Obviously inspection=lean (maybe a .45k ?), and I assume maybe a 5.7 (+/-.3) would be good for street use. What does everyone think? Thanks -Randy
#2
Supreme Member
iTrader: (1)
Join Date: Jun 2001
Location: 600 yds out
Posts: 1,520
Likes: 0
Received 0 Likes
on
0 Posts
Car: Bee-Bowdy
Engine: blowd tree-fity
Transmission: sebin hunnerd
Axle/Gears: fo-tins
Just as an observation, my friends TPI Trans Am usually has an intake air temp of 110-120 around town in this fall weather. Hope that helps in some way.
#3
Supreme Member
Join Date: Jul 1999
Location: Huntsville, AL
Posts: 1,431
Likes: 0
Received 1 Like
on
1 Post
Car: '00 Chevrolet Corvette
Engine: LS1
Transmission: 4L60E
Axle/Gears: 2.73
My IAT (mounted in my open element air cleaner) usually reads in the 110-120 degree range. I don't know how much of a difference it would really make. If you've got exhaust or some other mods that would require more fuel you might do a little better with a slightly cooler resistor.
-Mark W.
'88 SC Camaro w/ 305 TBI
-Mark W.
'88 SC Camaro w/ 305 TBI
#4
Member
Thread Starter
Join Date: Apr 2001
Location: East Windsor, NJ, 08520
Posts: 400
Likes: 0
Received 0 Likes
on
0 Posts
Car: 2002 Harley Nightrain
Engine: twin cam 88ci
Transmission: manual
Hmm, interesting. That actually was very helpful information. I forgot to ask that question, but I was wondering what the normal temps would be after I wrote the message. Thanks alot! I think you gave me my answer for DMV inspection. My car runs rich as it is now, so according to your temps a 1.5k ohm would be suitable for street driving, and a lower number would help get me past the sniffer test. I had no idea what temp. the incoming air was at, so thanks again guys. -Randy
Thread
Thread Starter
Forum
Replies
Last Post
86White_T/A305
Third Gen Association of Ontario
0
09-21-2015 05:28 PM
WhteRbt
Tech / General Engine
2
09-21-2015 09:48 AM