Started taking the L98 out. I started with the air intake. Between the hose that goes to the TB and the one that goes to the filter there was a black cylinder. Had a screen in it and something inside. I'm hoping this is really a SD system and I didn't get a MAF system...I'll post a pic of the "MAF" later. Maybe someone can click on the link in my sig (Trans Am), look at the engine pic and tell me? Thanks

-Corey

NOTE: I just bought a set of LS1 rear brakes!

 

Nope, SD does not have a MAF. If you're talking the L98 out of the '90 GTA you've got, that's still MAF. Only '91-'92 cars are SD.

 

The whole point of speed density was to eliminate the MAF.

 

Speed Density use a MAP sensor instead of a MAF

 

What's it take to switch over? Or should I even consider it? I won't be doing my own tuning. Staying MAF, will this make the swap harder?

 

Not sure what kind of swap you are doing but I if it is engine mods, your car should better deal with it than a sd car would until it was tuned.

MAF cars use a map sensor as well. Sd cars use rpm, throttle position sensor and map to determine airflow. The maf uses all of these plus a meter. That is why if I unplug my MAF, my car still runs.

 

Geuss I should have been clearer, the L98 swap into my LO3 RS. I geuss I'll stay with MAF, as long as it will still be a relatively simple swap.

-Corey

 

Even the MAF cars can use a little help from a modded EPROM.

 

I was just reading through thirdgen.org's f-body database, and they're saying that 90 camaros and firebirds were both using SD instead of MAF. So either their database was messed up or you have an older motor than you though, unless that's the stock motor. IF those engines are actually MAF, then i'm gonna be saved a ton o work swappin a 90 Formula L98 into my 88 Iroc.

 

I don't know. What does the vin say? MAF was in 89. 90 and up used SD. This is according to the wiring diagram in Chilton. in the 10th digit of the vin, J is 88, K is 89, L is 90 M is 91 and N is 92.

Maybe you have a late 89 that they badged as a 90.

 

If the black cylinder has a four wire connector, it's a MAF. SD uses a MAP sensor, and it isn't mounted in, or around the black cylinder.

pre 90 cars used MAF programming 90 & 92 used SD programming, post 92 cars use MAF programming and SD as backup if MAF fails (limp home mode.)

I assume you wanted SD because MAF is an air restriction.

 

But look at the pic tho. If that doesn't look like a MAF to you, please let me know.

 

Problem solved:
Ran the VIN at TGO. Model Year: 1989
So it's an '89. Should have checked the VIN first....

-Corey

 

Cheer up buddy. It was still a great buy. MAF is actually more efficient than SD because it actually measures the precise amount of air entering the intake. SD calculates it from a set of preexisting settings. Although MAF is an air restriction and a little more costly.

 

Just convert to SD.
Costs about $100 or so.
Just need an extra ECM connector, Knock Sensor, ECM and Prom, and a MAP sensor (can't remember if there is a MAP sensor on the MAF cars or not).

I had Jonh Millican re-pin my harness for me since I wasn't too familiar with pulling the wires out of the ecm connectors.