IAT Sensor... effect on LTFT
#1
Burning Brakes
Thread Starter
IAT Sensor... effect on LTFT
During my recent tuning sessions, I noticed LTFT increasing in the lower MAP/RPM cells. My thought is that this is due to the SUPER slow IAT sensor. I'm guessing this is both the sensor and PCM sample rate.
I take it there's nothing we can do on the sample rate?
How about a faster response / more accurate sensor? Or MAF from a diff year?
Man, since I'm new to ls1 tuning I have a bunch of questions and want to discuss... but everything has been discussed repeatedly on this platform in the past. Instead of asking, need to search more. I'll report back if I find/do anything on this.
I take it there's nothing we can do on the sample rate?
How about a faster response / more accurate sensor? Or MAF from a diff year?
Man, since I'm new to ls1 tuning I have a bunch of questions and want to discuss... but everything has been discussed repeatedly on this platform in the past. Instead of asking, need to search more. I'll report back if I find/do anything on this.
#3
Burning Brakes
Thread Starter
I think what’s happening is since IAT is factored into VE and with a slow/false reading the density is too low so LTFT adjust accordingly. A more accurate IAT reading would help this. Also have to reduce my IAT timing table to not loose power when I get going. Drag racers prob get pretty screwed here waiting in the lane.
Hey, starting reading your blog… great stuff!
#4
Le Mans Master
Member Since: Aug 2005
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St. Jude Donor '13-'14-'15
I am quite sure that the IAT's don't affect the LTFt's as you think--After the car gets warmed up yes the LTFT's can change but it is mostly as a result of the engine getting warmer----To get rid of "false IAT readings most all tuners will tweak the IAT table to compensate for false readings by "0" ing out all the deducts at WOT up to around 160* On a 5.7 engine it's from like .58 grams and higher