MAF table for LS7 MAF in a 5" housing?

[fcar1999ta]

I made a 5" CAI with 5" MAF housing going into a Mamo ported NW 102mm throttle body.

Does anyone happen to have MAF table for an LS7 MAF in a 5" housing?

02 F body OS 411 PCM

[blindsquirrel]

Wideband. Log error data. Apply error data to tune file. Write tune file to PCM. Repeat until satisfied.

[fcar1999ta]

I had a 4" MAF housing before, so does it make sense to bump my MAF table airflow up by a multiple of 1.250198949 (Difference in area between 4" and 5" circles) to start with?

[Ben Charles]

1.25 be close...

[fcar1999ta]

Lol. I just cut and pasted...i am lazy

[SultanHassanMasTuning]

SD that PCM

[fcar1999ta]

Looks like it worked. AFR on startup is now 12-13 and 14-15 after closed loop.

Before, it started at 16, went up to 21, can came back down as it entered closed loop.

[fcar1999ta]

We will see how it drives tomorrow.

[5FDP]

Obviously closed loop will always come back to stoich, that is what it is suppose to do.

See what fueling is like with your wideband under load in open loop, that is where you need it to be correct.

[fcar1999ta]

I don't have the Pro Link connected to the wideband yet, so I will have to eyeball it as much as I safely can.

[fcar1999ta]

Cold startup AFR is 12-13. Immediately started driving, and AFR flashed an 11, but was 12-13 99% of the time for a minute or so. On the highway, pretty constant 75mph, AFR was 15s probably 80% of the time. Hit 16s and 13s a few times

[fcar1999ta]

Since AZ has variable amounts of ethanol in the gas, I am going to set the wideband to read Lambda. I read somewhere that idle Lambda should be .70 and WOT Lambda should be .85. Is that accurate?

[5FDP]

Well, the lambda value depends on what you set the tune to do.

Don't go into this just thinking you can slap that 5in intake on there and do not much else.

You need to look at your tune and see what it's commanding and see if that matches what your wideband is saying.

Some engines will not like it being so rich when it's cold. Some might like .80-.85 lambda at start up and then have it reach 1.00 at 130-140+ degree coolant temp.

Some engines prefer .80 lambda at full throttle and other might like .85 or leaner for best power while still being safe.

If you are commanding .85 at full throttle in power enrichment, your wideband better be saying roughly .85 as well.

[alid62484]

Cold startup AFR is 12-13. Immediately started driving, and AFR flashed an 11, but was 12-13 99% of the time for a minute or so. On the highway, pretty constant 75mph, AFR was 15s probably 80% of the time. Hit 16s and 13s a few times

I think you are right I read more about this at dashing travis scott hoodie We will see how it drives tomorrow.

[Ben Charles]

Shoot for 1.0 lambda at idle and driving... whoever said .70 don’t listen to them

[fcar1999ta]

Well, the lambda value depends on what you set the tune to do.

Don't go into this just thinking you can slap that 5in intake on there and do not much else.

You need to look at your tune and see what it's commanding and see if that matches what your wideband is saying.

Some engines will not like it being so rich when it's cold. Some might like .80-.85 lambda at start up and then have it reach 1.00 at 130-140+ degree coolant temp.

Some engines prefer .80 lambda at full throttle and other might like .85 or leaner for best power while still being safe.

If you are commanding .85 at full throttle in power enrichment, your wideband better be saying roughly .85 as well.

At idle, the commanded it glued at 1.00. The sensor is bounces between 1.02 and 1.05. It jumps to 1.09 a few times, but I didn't see anything below 1.02. Had a couple of beers while tinkering with HPTuners, so logs while driving will have to wait until tomorrow.