flashing mods
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Rookie
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flashing mods
ok. i haven't really modded my motor because ive heard that you have to flash every mod or the computer will "learn it". but my question is what exactly is the pcm doing? because if you are increasing the the bore of a throttle body and porting manifolds, opening exhaust and such shouldn't you you still see gains? the motor is an air pump. i know its not a mass air system but my 90 camaro wasnt mass air either. it was computer controlled with the temp sensor in the intake. and when i opened up my intake and exhaust i added bigger injectors and i saw gains that didnt go away. can someone explain this in depth a little more to me?
Champion
Joined: Nov 2006
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From:
RE: flashing mods
i believe its something called speed density. I dont know about your camaro, but speed density is much more condusive for modding than a MAF system (IMHO). With speed density the computer has real time variables somewhat unlike the MAF system which is set to run with fixed variables but also uses real time variables. both systems assume a certian throttle body cfm and bore and whatnot, but with the maf system it meters the air velosity and uses the computer to compensate. (im not 100% familear with the speed density setup, but ill give you my general understanding of it) The air temp is mesured and computed with the ammount of throttle to get the ammount of air actually going into the intake. temp for the density of air. The TPS computes the throttle angle and throws the number into the equation. The computer is programed to know what cfm is flowing at each throttle angle. thats how the speed density is computed. now maf systems also have an air temp sensor too, but it does not play as big of a part as the tps and maf sensors. so when people say it learns the mods, it really doesnt, but yet does...confusing yea? say you put on a cold air intake. #1 your dropping the air temp, which the comp will pick up and add fuel for the denser air. #2 you will be getting increased airflow from the kit/filter, which the tps will not be able to compensate for. That means more air for an = ammount of fuel which= leaner mixture which = more power. your fine with running leaner, just dont run it too lean to the point where you get detonation. hope my confusing wording helped.
Record Breaker
Joined: Oct 2004
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From: Gaylord, MI
RE: flashing mods
You don't have to reprogram the computer for every mod you do. The PCM will "learn" the diffrence after a while and will stop trying to correct it. It is a good idea to reset the PCM after every mod by unpluging the battery for 10 mins so the PCM "forgets" most of the stuff it knew from before.
You will see still noticable gains when you do mods, especially like intake manifold, heads, ect. You will get a bit more squeezed out of it if you do a custom program, which will also be noticable. But you WILL see a gain even if you don't reprogram the PCM.
You will see still noticable gains when you do mods, especially like intake manifold, heads, ect. You will get a bit more squeezed out of it if you do a custom program, which will also be noticable. But you WILL see a gain even if you don't reprogram the PCM.
Rookie
Joined: Oct 2006
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RE: flashing mods
ORIGINAL: IndyRamMan
i believe its something called speed density. I dont know about your camaro, but speed density is much more condusive for modding than a MAF system (IMHO). With speed density the computer has real time variables somewhat unlike the MAF system which is set to run with fixed variables but also uses real time variables. both systems assume a certian throttle body cfm and bore and whatnot, but with the maf system it meters the air velosity and uses the computer to compensate. (im not 100% familear with the speed density setup, but ill give you my general understanding of it) The air temp is mesured and computed with the ammount of throttle to get the ammount of air actually going into the intake. temp for the density of air. The TPS computes the throttle angle and throws the number into the equation. The computer is programed to know what cfm is flowing at each throttle angle. thats how the speed density is computed. now maf systems also have an air temp sensor too, but it does not play as big of a part as the tps and maf sensors. so when people say it learns the mods, it really doesnt, but yet does...confusing yea? say you put on a cold air intake. #1 your dropping the air temp, which the comp will pick up and add fuel for the denser air. #2 you will be getting increased airflow from the kit/filter, which the tps will not be able to compensate for. That means more air for an = ammount of fuel which= leaner mixture which = more power. your fine with running leaner, just dont run it too lean to the point where you get detonation. hope my confusing wording helped.
i believe its something called speed density. I dont know about your camaro, but speed density is much more condusive for modding than a MAF system (IMHO). With speed density the computer has real time variables somewhat unlike the MAF system which is set to run with fixed variables but also uses real time variables. both systems assume a certian throttle body cfm and bore and whatnot, but with the maf system it meters the air velosity and uses the computer to compensate. (im not 100% familear with the speed density setup, but ill give you my general understanding of it) The air temp is mesured and computed with the ammount of throttle to get the ammount of air actually going into the intake. temp for the density of air. The TPS computes the throttle angle and throws the number into the equation. The computer is programed to know what cfm is flowing at each throttle angle. thats how the speed density is computed. now maf systems also have an air temp sensor too, but it does not play as big of a part as the tps and maf sensors. so when people say it learns the mods, it really doesnt, but yet does...confusing yea? say you put on a cold air intake. #1 your dropping the air temp, which the comp will pick up and add fuel for the denser air. #2 you will be getting increased airflow from the kit/filter, which the tps will not be able to compensate for. That means more air for an = ammount of fuel which= leaner mixture which = more power. your fine with running leaner, just dont run it too lean to the point where you get detonation. hope my confusing wording helped.
Out of the box, speed density out performs a MAF system, but unlike a SD system an MAf system can be modded further without "custom" tuning.
I went through this with my 306 mustang and eventually converted it to MAF to smooth out idle and tune problems
Champion
Joined: Nov 2006
Posts: 2,902
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From:
RE: flashing mods
ORIGINAL: JD770
Out of the box, speed density out performs a MAF system, but unlike a SD system an MAf system can be modded further without "custom" tuning.
I went through this with my 306 mustang and eventually converted it to MAF to smooth out idle and tune problems
ORIGINAL: IndyRamMan
i believe its something called speed density. I dont know about your camaro, but speed density is much more condusive for modding than a MAF system (IMHO). With speed density the computer has real time variables somewhat unlike the MAF system which is set to run with fixed variables but also uses real time variables. both systems assume a certian throttle body cfm and bore and whatnot, but with the maf system it meters the air velosity and uses the computer to compensate. (im not 100% familear with the speed density setup, but ill give you my general understanding of it) The air temp is mesured and computed with the ammount of throttle to get the ammount of air actually going into the intake. temp for the density of air. The TPS computes the throttle angle and throws the number into the equation. The computer is programed to know what cfm is flowing at each throttle angle. thats how the speed density is computed. now maf systems also have an air temp sensor too, but it does not play as big of a part as the tps and maf sensors. so when people say it learns the mods, it really doesnt, but yet does...confusing yea? say you put on a cold air intake. #1 your dropping the air temp, which the comp will pick up and add fuel for the denser air. #2 you will be getting increased airflow from the kit/filter, which the tps will not be able to compensate for. That means more air for an = ammount of fuel which= leaner mixture which = more power. your fine with running leaner, just dont run it too lean to the point where you get detonation. hope my confusing wording helped.
i believe its something called speed density. I dont know about your camaro, but speed density is much more condusive for modding than a MAF system (IMHO). With speed density the computer has real time variables somewhat unlike the MAF system which is set to run with fixed variables but also uses real time variables. both systems assume a certian throttle body cfm and bore and whatnot, but with the maf system it meters the air velosity and uses the computer to compensate. (im not 100% familear with the speed density setup, but ill give you my general understanding of it) The air temp is mesured and computed with the ammount of throttle to get the ammount of air actually going into the intake. temp for the density of air. The TPS computes the throttle angle and throws the number into the equation. The computer is programed to know what cfm is flowing at each throttle angle. thats how the speed density is computed. now maf systems also have an air temp sensor too, but it does not play as big of a part as the tps and maf sensors. so when people say it learns the mods, it really doesnt, but yet does...confusing yea? say you put on a cold air intake. #1 your dropping the air temp, which the comp will pick up and add fuel for the denser air. #2 you will be getting increased airflow from the kit/filter, which the tps will not be able to compensate for. That means more air for an = ammount of fuel which= leaner mixture which = more power. your fine with running leaner, just dont run it too lean to the point where you get detonation. hope my confusing wording helped.
Out of the box, speed density out performs a MAF system, but unlike a SD system an MAf system can be modded further without "custom" tuning.
I went through this with my 306 mustang and eventually converted it to MAF to smooth out idle and tune problems
Grand Champion
Joined: Nov 2004
Posts: 6,099
Likes: 6
From: Colorado
RE: flashing mods
ORIGINAL: IndyRamMan
i believe its something called speed density. I dont know about your camaro, but speed density is much more condusive for modding than a MAF system (IMHO). With speed density the computer has real time variables somewhat unlike the MAF system which is set to run with fixed variables but also uses real time variables. both systems assume a certian throttle body cfm and bore and whatnot, but with the maf system it meters the air velosity and uses the computer to compensate. (im not 100% familear with the speed density setup, but ill give you my general understanding of it) The air temp is mesured and computed with the ammount of throttle to get the ammount of air actually going into the intake. temp for the density of air. The TPS computes the throttle angle and throws the number into the equation. The computer is programed to know what cfm is flowing at each throttle angle. thats how the speed density is computed. now maf systems also have an air temp sensor too, but it does not play as big of a part as the tps and maf sensors. so when people say it learns the mods, it really doesnt, but yet does...confusing yea? say you put on a cold air intake. #1 your dropping the air temp, which the comp will pick up and add fuel for the denser air. #2 you will be getting increased airflow from the kit/filter, which the tps will not be able to compensate for. That means more air for an = ammount of fuel which= leaner mixture which = more power. your fine with running leaner, just dont run it too lean to the point where you get detonation. hope my confusing wording helped.
i believe its something called speed density. I dont know about your camaro, but speed density is much more condusive for modding than a MAF system (IMHO). With speed density the computer has real time variables somewhat unlike the MAF system which is set to run with fixed variables but also uses real time variables. both systems assume a certian throttle body cfm and bore and whatnot, but with the maf system it meters the air velosity and uses the computer to compensate. (im not 100% familear with the speed density setup, but ill give you my general understanding of it) The air temp is mesured and computed with the ammount of throttle to get the ammount of air actually going into the intake. temp for the density of air. The TPS computes the throttle angle and throws the number into the equation. The computer is programed to know what cfm is flowing at each throttle angle. thats how the speed density is computed. now maf systems also have an air temp sensor too, but it does not play as big of a part as the tps and maf sensors. so when people say it learns the mods, it really doesnt, but yet does...confusing yea? say you put on a cold air intake. #1 your dropping the air temp, which the comp will pick up and add fuel for the denser air. #2 you will be getting increased airflow from the kit/filter, which the tps will not be able to compensate for. That means more air for an = ammount of fuel which= leaner mixture which = more power. your fine with running leaner, just dont run it too lean to the point where you get detonation. hope my confusing wording helped.
So, you can increase the air flow through things like TB mods, CAI, and intake mods. The PCM will use that increased air to the best of its abilities, but you will reach a point where the PCM just can compensate any further for that amount of air. That is the point when you will want a flash to tell the PCM how to use that extra amount of air if it determines through the sensor inputs that it is available.
Thread Starter
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Rookie
Joined: Sep 2006
Posts: 62
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RE: flashing mods
ORIGINAL: IndyRamMan
i believe its something called speed density. I dont know about your camaro, but speed density is much more condusive for modding than a MAF system (IMHO). With speed density the computer has real time variables somewhat unlike the MAF system which is set to run with fixed variables but also uses real time variables. both systems assume a certian throttle body cfm and bore and whatnot, but with the maf system it meters the air velosity and uses the computer to compensate. (im not 100% familear with the speed density setup, but ill give you my general understanding of it) The air temp is mesured and computed with the ammount of throttle to get the ammount of air actually going into the intake. temp for the density of air. The TPS computes the throttle angle and throws the number into the equation. The computer is programed to know what cfm is flowing at each throttle angle. thats how the speed density is computed. now maf systems also have an air temp sensor too, but it does not play as big of a part as the tps and maf sensors. so when people say it learns the mods, it really doesnt, but yet does...confusing yea? say you put on a cold air intake. #1 your dropping the air temp, which the comp will pick up and add fuel for the denser air. #2 you will be getting increased airflow from the kit/filter, which the tps will not be able to compensate for. That means more air for an = ammount of fuel which= leaner mixture which = more power. your fine with running leaner, just dont run it too lean to the point where you get detonation. hope my confusing wording helped.
i believe its something called speed density. I dont know about your camaro, but speed density is much more condusive for modding than a MAF system (IMHO). With speed density the computer has real time variables somewhat unlike the MAF system which is set to run with fixed variables but also uses real time variables. both systems assume a certian throttle body cfm and bore and whatnot, but with the maf system it meters the air velosity and uses the computer to compensate. (im not 100% familear with the speed density setup, but ill give you my general understanding of it) The air temp is mesured and computed with the ammount of throttle to get the ammount of air actually going into the intake. temp for the density of air. The TPS computes the throttle angle and throws the number into the equation. The computer is programed to know what cfm is flowing at each throttle angle. thats how the speed density is computed. now maf systems also have an air temp sensor too, but it does not play as big of a part as the tps and maf sensors. so when people say it learns the mods, it really doesnt, but yet does...confusing yea? say you put on a cold air intake. #1 your dropping the air temp, which the comp will pick up and add fuel for the denser air. #2 you will be getting increased airflow from the kit/filter, which the tps will not be able to compensate for. That means more air for an = ammount of fuel which= leaner mixture which = more power. your fine with running leaner, just dont run it too lean to the point where you get detonation. hope my confusing wording helped.