Resistor Mod Cleared me of Detonation
Thread Starter
Staging Lane
Joined: Jul 2006
Posts: 65
Likes: 0
Resistor Mod Cleared me of Detonation Prior to doing the mod I was experiencing up to 3.9* of kr at the top end of some of the gears. Put the 4.6k ohm 1/2 watt resistor now the iat thinks its getting 57* air and I only experience extreme small kr at 120mph.
I dont know how that works but if somebody could explain that to me and weather or not it is safe to continue this setup that would be greatlly appreciated.
Mods are
Ported n Polished TB and MAF, K&N kit, magnaflow catback.
I dont know how that works but if somebody could explain that to me and weather or not it is safe to continue this setup that would be greatlly appreciated.
Mods are
Ported n Polished TB and MAF, K&N kit, magnaflow catback.
Originally Posted by bird2002
Prior to doing the mod I was experiencing up to 3.9* of kr at the top end of some of the gears. Put the 4.6k ohm 1/2 watt resistor now the iat thinks its getting 57* air and I only experience extreme small kr at 120mph.
I dont know how that works but if somebody could explain that to me and weather or not it is safe to continue this setup that would be greatlly appreciated.
Mods are
Ported n Polished TB and MAF, K&N kit, magnaflow catback.
I dont know how that works but if somebody could explain that to me and weather or not it is safe to continue this setup that would be greatlly appreciated.
Mods are
Ported n Polished TB and MAF, K&N kit, magnaflow catback.
Originally Posted by brad8266
All you did was a half *** band aid fix and actually reduced your timing anyway right off the bat. There is a table that pulls timing based of IAT and since you tricked the IAT its probably pulling some timing without logging KR.
PCM pulled timing because of resistor - no.
PCM increase fueling because it assumes cooler/denser air - most likely.
The PCM won't pull timing for lower IAT's according to my copy of a stock '02 tune. Only once the IAT's are above 86*F at part throttle and 95*F at WOT will the PCM begin pulling timing.
Thread Starter
Staging Lane
Joined: Jul 2006
Posts: 65
Likes: 0
It seemed to make my car run faster. I was able to hang with my buddies TA. I read an article that showed about a 1.5* timing advance with this mod.
Im assuming the proper way of fixing this problem would be to go get the car tuned to have them add in more fuel to help prevent the KR???
The main thing im concerned about right now is weather or not this a "safe" setup for the rest of the summer?? Am I putting anything at risk??
Im assuming the proper way of fixing this problem would be to go get the car tuned to have them add in more fuel to help prevent the KR???
The main thing im concerned about right now is weather or not this a "safe" setup for the rest of the summer?? Am I putting anything at risk??
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Originally Posted by SSpdDmon
Half-*** band aid fix - yes.
PCM pulled timing because of resistor - no.
PCM increase fueling because it assumes cooler/denser air - most likely.
The PCM won't pull timing for lower IAT's according to my copy of a stock '02 tune. Only once the IAT's are above 86*F at part throttle and 95*F at WOT will the PCM begin pulling timing.
PCM pulled timing because of resistor - no.
PCM increase fueling because it assumes cooler/denser air - most likely.
The PCM won't pull timing for lower IAT's according to my copy of a stock '02 tune. Only once the IAT's are above 86*F at part throttle and 95*F at WOT will the PCM begin pulling timing.
Thanks for clearing that up. Either way its still a bad aid fix.
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Originally Posted by SSpdDmon
PCM increase fueling because it assumes cooler/denser air - most likely.
Originally Posted by 2xLS1
Show me the table in the calibration, any calibration, where it does this.
If it does modify fueling it is a very very small amount.
Originally Posted by joecar
PCM sees colder IAT, so it computes more airmass, so it adds more fuel... running richer may prevent knock.
Originally Posted by ZL1Killa
isn't there a table in efi live that has adding/subtracting fuel based on IAT temps... its a factor i believe
Originally Posted by 2xLS1
Show me the table in the calibration, any calibration, where it does this.
When IAT's are 60's~70's, I idle at mid 14's on the WB. Once the IAT's are over 90*F, I start to see more 15's and some 16's on the WB.
That's in practice.
The part in the tune I'd like to draw your attention to is the dynamic airflow calculation from the VE table. It calculates fueling in part based on charge temperature, which comes from IAT and ECT. I know based on application that the VE does effect not only transitions, but idle as well. That's why you have to lop off 40% or more from the low RPM regions of the VE for a big cam'd car to idle right. If it was a pure MAF measured value providing an airflow measurement to the PCM, this wouldn't be necessary.
Even if it's a MAF only tune (where the dynamic airflow threshold limits are reduced to 1 RPM), I've seen IAT alter AFR. I wish I knew more of the details to answer your question. But, the fact is I only have my personal experience.