Tuned in SD now want to go back to running maf.

[madvapist]

So as the title states ive tuned my car in sd and id like to go back to running the maf, however everytime i plug in the maf the car runs 18:1 afr no matter what changes I make to the maf cal or VE table. Ive searched around and couldnt find much help. I dont know if its something i could be doing wrong within the tune or what. Car is a 04 corvette and its got full exhaust and a BTR Stage 3 cam. The car runs great minus slight bucking while part throttle cruising. Ive attached my tune in hopes its something small i messed up and that i can fix with the help of the forum.

[5FDP]

Your MAF feq fail is still set to zero if that's the tune you are running with the MAF enabled.

[madvapist]

That is what im running right now but thats because we put it back to sd after it wouldn't read right, but when i plugged the maf back in i set it to 13500 hz and still ran lean. Even tried adjusting the maf and still with everything i did it ran at 18:1.

[BRANDON.RYAN]

That is what im running right now but thats because we put it back to sd after it wouldn't read right, but when i plugged the maf back in i set it to 13500 hz and still ran lean. Even tried adjusting the maf and still with everything i did it ran at 18:1.

you reenabled closed loop too correct? I had a similar issue with my truck. after dialing in maf and reenabling closed loop It would run 15:1 or higher. well I altered my 02 voltages. (stock was 451mv I changed them to run 751mv and it got me down to the correct afr. I believe its an issue with my long tubes but haven't installed a new sensor to confirm its the long tubes or a 02 sensor issue. but in my case its working just have to play with it to get your afr right.

[madvapist]

I didnt reenable closed loop but i will try that tonight.

[madvapist]

Does anyone else have any input on what my issue might be?

[Z06-Hammer]

Did you put these tables back to stock value?

Closed Loop Enable> ECT vs IAT
LTFT Enable> Min ECT & Max ECT

[madvapist]

i did not i will try that and report back.

[mbray01]

so when you say you plugged the maf back in, have you been running it sd with it unplugged.
is it a 5 wire sensor, or do you have a 3 wire maf installed with a seperate iat

if you have a 5 wire and have been running it unplugged, then your iat has been reading -40 at all times, which will throw all of your fueling off.
looking at your ve, it looks like really small numbers for a btr stage 3, which makes sense, as it thinks it is getting more air than it actually is.

what is happening is it sees everything way to cold, then plug the maf in and now you are way lean.
also your ve is turned off at 4000 rpms on a sd tune

if you have the 5 wire, you have to have it plugged in, and failed in the tune, or you will never get fueling correct

[Z06-Hammer]

so when you say you plugged the maf back in, have you been running it sd with it unplugged.
is it a 5 wire sensor, or do you have a 3 wire maf installed with a seperate iat

if you have a 5 wire and have been running it unplugged, then your iat has been reading -40 at all times, which will throw all of your fueling off.
looking at your ve, it looks like really small numbers for a btr stage 3, which makes sense, as it thinks it is getting more air than it actually is.

what is happening is it sees everything way to cold, then plug the maf in and now you are way lean.
also your ve is turned off at 4000 rpms on a sd tune

if you have the 5 wire, you have to have it plugged in, and failed in the tune, or you will never get fueling correct

Yes, his VE table is way low. He will need to copy in his stock table and re-tune.

[mbray01]

also noticed that timing is at 35*, and if iat is unplugged its trying to add another 8*
so its trying to get 43* total timing, must be some really good fuel for that
what, even at the maximum knock retard that you have set at 10*, its still going to get 33* total timing.

[Z06-Hammer]

also noticed that timing is at 35*, and if iat is unplugged its trying to add another 8*
so its trying to get 43* total timing, must be some really good fuel for that
what, even at the maximum knock retard that you have set at 10*, its still going to get 33* total timing.

Holy crap! Didn't even look at his timing tables!

[madvapist]

I see where I flawed myself on the tune by unplugging the maf and im getting 0 knock, but ill plug it back in and re tune the ve table up to 4k rpm and let you guys know how its going. thank you all.

[madvapist]

Yes, his VE table is way low. He will need to copy in his stock table and re-tune.

What stock table are you referring to? Ive got svo red tops and the car runs good just need to plug it in and retune it now.

[madvapist]

So i spent the last few hours re doing my ve table from 0-4000 rpm and its running better than it was before. Ill continue to keep refining it but i was looking at my timing and yeah i decided to pull 2 degrees and now im getting knock. Anyone have any idea why that might be?

[matty b]

yeah i decided to pull 2 degrees and now im getting knock. Anyone have any idea why that might be?

Because its still too advanced for your octane level

[madvapist]

If i leave it alone at 36* at wot its fine but if i pull timing i get knock. Does it mean its just way to high to begin with?