97-98 ECM and 85mm MAF
12-29-2010, 11:12 AM
#1
97-98 ECM and 85mm MAF Will the Z06 MAF work on a 97 Corvette? I have the 5 to 3 wire pigtail. When I plug it up the car dies. I was about to get another 85mm MAF but read a post about how the 98 Fbody wont accept this MAF because the frequencies are too high.
I havent tried it on my 98 Camaro yet. Here is a clip from the post I read:
"As I put in the subject line, I have a Z06 85mm MAF for sale. I bought it 2 or 3 years ago and never used it, as I have a 1998 Camaro and since it's the bastard child of the LS1 PCM's, it won't accept the high airflow rates of the Z06 MAF (the Z06 MAF is capable of sending out a signal more than 12000Hz which the 98's can't handle). I didn't know this when I bought the item from another member here at LS1Tech. If you have a 99+ PCM you should be alright, however.
This MAF also has the 5-pin to 3- and 2-pin harness so is ready to be dropped into an F-body LS1 setup (except 1998). The screen is in near-flawless condition; I haven't removed it or anything. I honestly can't attest to how much it was used before me, but I haven't used it in the last 2-3 years (and up to this point have been too lazy to try and sell it)."
I also found this on ls1howto:
"Optional - Requires LS1Edit software
If you did not buy the LS1 calibrated MAF, then now is the time to break out LS1EDIT and change over your MAF tables. The tables below show you the 2 tables you can use, depending on if you are using a de-screened maf or a screened maf.
You'll need to grab your stock program and open it up to the maf flow tables. You'll notice the table starts at 1,500hz, and goes up to 12,000hz on '99 and '00 cars, or 1,500 to 11,250hz on '97-'98 cars. Now, the actual tables used in 2001+ cars that come with these larger MAFs range from 750 to 12,000hz, so what do we do? Well, 750-1500hz is really low flow so we'll just ignore that whole section of the data since our computer will never understand it. If you have a 97-98 year car, that leaves you with the 11,250-12,000 range that will be unconvertible since no entries can exist for that range. What this means is with the new maf table, once you hit the 11,250hz your maf will flatline. Now, you may say that your car ran fine before with that limit so it also will with the new maf, but that is not the case. Read on...
The 97-2000 maf says that 11,250hz is 428.52 gms/sec of airflow. Well, the new 2001+ maf will say that 11,250hz is 359.16, which means that on a 97 or 98 year model car, your maximum measured airflow will drop by over 68gms/sec (from 428 to 359). This is why for '97 and '98 year models you should buy the recalibrated maf, or do not do this mod at all! 1999 and 2000 model cars will have the extended maf table up to 12,000hz and their ceiling will remain within the same threshold as it was stock, which is what we want.
I havent tried it on my 98 Camaro yet. Here is a clip from the post I read:
"As I put in the subject line, I have a Z06 85mm MAF for sale. I bought it 2 or 3 years ago and never used it, as I have a 1998 Camaro and since it's the bastard child of the LS1 PCM's, it won't accept the high airflow rates of the Z06 MAF (the Z06 MAF is capable of sending out a signal more than 12000Hz which the 98's can't handle). I didn't know this when I bought the item from another member here at LS1Tech. If you have a 99+ PCM you should be alright, however.
This MAF also has the 5-pin to 3- and 2-pin harness so is ready to be dropped into an F-body LS1 setup (except 1998). The screen is in near-flawless condition; I haven't removed it or anything. I honestly can't attest to how much it was used before me, but I haven't used it in the last 2-3 years (and up to this point have been too lazy to try and sell it)."
I also found this on ls1howto:
"Optional - Requires LS1Edit software
If you did not buy the LS1 calibrated MAF, then now is the time to break out LS1EDIT and change over your MAF tables. The tables below show you the 2 tables you can use, depending on if you are using a de-screened maf or a screened maf.
You'll need to grab your stock program and open it up to the maf flow tables. You'll notice the table starts at 1,500hz, and goes up to 12,000hz on '99 and '00 cars, or 1,500 to 11,250hz on '97-'98 cars. Now, the actual tables used in 2001+ cars that come with these larger MAFs range from 750 to 12,000hz, so what do we do? Well, 750-1500hz is really low flow so we'll just ignore that whole section of the data since our computer will never understand it. If you have a 97-98 year car, that leaves you with the 11,250-12,000 range that will be unconvertible since no entries can exist for that range. What this means is with the new maf table, once you hit the 11,250hz your maf will flatline. Now, you may say that your car ran fine before with that limit so it also will with the new maf, but that is not the case. Read on...
The 97-2000 maf says that 11,250hz is 428.52 gms/sec of airflow. Well, the new 2001+ maf will say that 11,250hz is 359.16, which means that on a 97 or 98 year model car, your maximum measured airflow will drop by over 68gms/sec (from 428 to 359). This is why for '97 and '98 year models you should buy the recalibrated maf, or do not do this mod at all! 1999 and 2000 model cars will have the extended maf table up to 12,000hz and their ceiling will remain within the same threshold as it was stock, which is what we want.
