93 camaro auto. stock with bolt ons. dragraced mostly but driven to/from the track.

my car is really inconsistent at the track. 1st thing in the morning say 60 degrees it will run 13.50 then 3 oclock in the afternoon 80 degrees it will go 13.80. im looking to trick the pcm via putting in a resister in place of the airtemp sensor to make it a lil more consistent. doesnt matter to me what what my elapsedtime is, as long as the car repeats. what size resister for say 45 degrees? will it work? what would the repercussions be?

currently attempting to figure this out myself but i cant find my usb to adl cable. i remember putting it somewheres i would remember. i wonder if i could use an olm meter. damn wheres my cable. race on saturday. thx.

 

you could have the car tuned to be more consistent. heres the chart at shbox,,, again. lol. 4th Gen LT1 F-Body Tech Aids number 19

 

It is not the air fuel ratio that is slowing the car down. Loss of power is due to higher air temp in the afternoon, as all engines make less power as ambient temperature increases. Giving more fuel when not needed is not going to improve things, most likely will cause the engine to lose power.

 

perfect crab, exactly what i was looking for. thx again.

 

How does the computer "tune" compensate for changes in air temperature, under-hood temperature, engine temperature, barometric pressure, humidity, etc.?
Because those ever-changing factors are what's causing his time variations from early in the day to later in the day.

 

i think unplugging the air temp sensor will do the same thing. should stay in open loop. i would think you would want to lean the mix a tad for higher temp. or ice the intake. if stock the tune should improve both numbers and i would think there would be more consistency.

 

bought a 7000 olm resister, going to try it tomorrow.

i agree about the humidy, b.pressure ect slowing the car down. just not by 3 tenths of a second no matter what the weather. good air to bad air maybe a tenth, on a consistent car. im chasing something peculiar to this car slowing it down and speeding it up. even if i could make it a lil more consistent id be happy.thx.

 

just fyi, resister seemed to help. 13.50, 13.54,13.54 all in good air, all before noon, then i snapped my throttle cable.

 

How can you tell the resistor helped? Those are the same morning times you were getting before. And for a fair comparison, weather conditions would have to be identical from then to now, which it never is.

 

yea ur right, not enough runs to say it helped or not. i was just really happy with back to back same runs, its never done that before.

as for the weather conditions im using a weather station. it tells me the conditions. once i punch enough runs into it and get a data base then as the conditions change through out the day it predicts my et.