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My other car has wings
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Discussion Starter #1
Just to make sure before I do something really stupid....

I am going to attempt non-WOT VE table tuning tomorrow or this weekend.
Seems like from my research that the only way to disable the MAF in my 2006 is to set all ZERO's in the Hz table, turn off P101,102 and 103 codes and raise the PE limit enough to keep it out of the way while I do some low-mid power logging of both LTFT's and STFT's.

Is there anything I'm missing?

I just realized that since I have the IAT breakout harness maybe I can just unplug the MAF connection?
 

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Just to make sure before I do something really stupid....

I am going to attempt non-WOT VE table tuning tomorrow or this weekend.
Seems like from my research that the only way to disable the MAF in my 2006 is to set all ZERO's in the Hz table, turn off P101,102 and 103 codes and raise the PE limit enough to keep it out of the way while I do some low-mid power logging of both LTFT's and STFT's.

Is there anything I'm missing?

I just realized that since I have the IAT breakout harness maybe I can just unplug the MAF connection?
You do not want to turn off those codes you want them to report on first error. Since I run speed density is set them to report on first error but not turn the sel on for those codes.

Didn't you just pay for a dyno tune? They most likely used a wide band so your fueling should be good.
 

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My other car has wings
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Discussion Starter #3
Thanks!
Yes, I just got the dyno tune, but as seems to be the norm not much time gets spent on driveability. WOT tuning was the lions share of the tuners work. I realize that setting up the VE table doesn't do much for closed loop operation but it should make for smoother throttle transients if I understand how the PCM works? Besides that its a fun exercise and if I ever go to SD I'll be ahead of the game.
 

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To disable the MAF, you need to go to Engine Diag -> Airflow and set "MAF Frequency Fail High" to 0. After that, you change the DTCs for P0101-P0103 to "MIL on First Error" and uncheck the SES Enable box (or leave it on so that the SES light reminds you to set it back to normal).

The above is for an 04, but the 05-06 should be similar.
 

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My other car has wings
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Discussion Starter #5
Perfect, how about DFCO anything need to be done to that for the VE logging?
 

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Rambler is stuck in 2nd gear
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Turn off DFCO, COT and Engine--Airflow--Dynamic--Dynamic airflow, Make high 8000 rpm, low 7900rpm. If you are not using a wideband, turn off the LTFT's and use STFT's to tune with. In your scanner, in channels, remove the Maf channel that you are logging. You don't need to zero out the hz tables for maf. Drive smoothly and hit as many cells as you can.
 

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My other car has wings
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Discussion Starter #7 (Edited)
Thanks Lakegoat.
In setting up the VE logging tune I see that my tuner had turned off Dynamic Airflow? Basically just using filtered MAF airflow above 200RPM instead of blending with VE. Is this a common practice with just a mild cam? Or just a shortcut to avoid updating the VE table.
 

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Rambler is stuck in 2nd gear
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I'm not sure what you are asking. Normally these cars have Hi Rpm disable at 3600rpm and reenable at 3500rpm. The 8000rpm is so it doesn't try to reference the maf while you are ve tuning.
 

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My other car has wings
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Discussion Starter #9 (Edited)
I'm not sure what you are asking. Normally these cars have Hi Rpm disable at 3600rpm and reenable at 3500rpm. The 8000rpm is so it doesn't try to reference the maf while you are ve tuning.
I probably wasn't typing clearly LOL....The final tune from my tuner had those values set at 200 and 100 respectively. I think that effectively eliminates the dynamic blended MAF/VE airflow calculations that are usually done by the PCM from idle up to 3600 RPM as you noted. I just don't know why he turned that function off?

P.S. My first VE mapping STFT's were from 5-10% off. This was in the 800-2400 RPM range. I'll be doing another logging session later today to get the STFT's from 2400 to 4000.
 

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all your tuning adjustments make me worry about taking mine somewhere, ha. ive been watching my stfts jump all around since adding the xair intake
 

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My other car has wings
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Discussion Starter #11
The first thing I'll say is that if you want to see STFT's bouncing around you should watch a Vararam. That thing had my MAF doing a nostop dance! It made life a little challenging on my tuners and it ended up with a very non-smooth MAF/frequency/flow curves. I put the XAir on and so far it has been smoothing out all those strange kinks in the MAF curves. I will still have to go back to the dyno to do the WOT adjustments due to the XAir. Unless I take the plunge and buy a Wideband O2 and do it myself. Either way I bet it will be a piece of cake compared to the Vararam.

In fairness to the 2 different tuners I've used in the last 2 month they do a great job tuning WOT and idle and one of them actually had me drive him around in the car while he logged something, presumably he was just working cruise fuel trims. SInce I purchased HP Tuners I downloaded their 2 final tunes and have been comparing them to each other and to the stock tune. Some things they have done are well published on the HP tuner forums, but some things have me scratching my head. What I have been doing over the last couple of weeks is working driveability issues and filling in all the areas of the tune that professional tuners just don't have the time to do. I'll admit I'm somewhat anal about this stuff and I really want to make sure I'm taking full advantage of all the useful powerful features in the PCM.
 

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The first thing I'll say is that if you want to see STFT's bouncing around you should watch a Vararam. That thing had my MAF doing a nostop dance! It made life a little challenging on my tuners and it ended up with a very non-smooth MAF/frequency/flow curves. I put the XAir on and so far it has been smoothing out all those strange kinks in the MAF curves. I will still have to go back to the dyno to do the WOT adjustments due to the XAir. Unless I take the plunge and buy a Wideband O2 and do it myself. Either way I bet it will be a piece of cake compared to the Vararam.

In fairness to the 2 different tuners I've used in the last 2 month they do a great job tuning WOT and idle and one of them actually had me drive him around in the car while he logged something, presumably he was just working cruise fuel trims. SInce I purchased HP Tuners I downloaded their 2 final tunes and have been comparing them to each other and to the stock tune. Some things they have done are well published on the HP tuner forums, but some things have me scratching my head. What I have been doing over the last couple of weeks is working driveability issues and filling in all the areas of the tune that professional tuners just don't have the time to do. I'll admit I'm somewhat anal about this stuff and I really want to make sure I'm taking full advantage of all the useful powerful features in the PCM.
since mine doesnt have a cam its probably not as big of a deal on the driveability at least. just wouldnt mind getting it a little more dialed in on the fueling
 

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Rambler is stuck in 2nd gear
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I probably wasn't typing clearly LOL....The final tune from my tuner had those values set at 200 and 100 respectively. I think that effectively eliminates the dynamic blended MAF/VE airflow calculations that are usually done by the PCM from idle up to 3600 RPM as you noted. I just don't know why he turned that function off?

P.S. My first VE mapping STFT's were from 5-10% off. This was in the 800-2400 RPM range. I'll be doing another logging session later today to get the STFT's from 2400 to 4000.
He had it set up as a maf only tune instead of a blended tune. The 3600 number means it is in blended mode (maf and ve) until 3600 rpm and then it switches to maf only after 3600. If you want to tune your ve so it runs correctly on maf or ve table, use the 8000 number so it never goes to maf while you are tuning the ve table. Then you can go back to blended after you finish tuning the ve. 5% variance in the ve table is not bad. Make sure when you write calibration and start the scanner that you turn the key on, open scanner, special functions and clear fuel trims. Otherwise you will be chasing your tail on fueling. After a tune change drive around a few minutes to make sure everything is cleared before you start logging. Drive smooth.
 

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My other car has wings
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Discussion Starter #14
Lakegoat, basically followed what you said except I've been in the habit of pulling the negative battery cable to clear everything and I've been logging with LTFT's off anyway. Finished up the 2400-4000 VE logging late yesterday and had a few cells over 10% lean. Really tough to get logging Hits above 75kPa. The car just accelerates thru those cells way too fast. I need to find some long steep hills...LOL
 

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Rambler is stuck in 2nd gear
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hold it in 2nd gear and ride the brake to hit the cells. Are you mashing the gas to the floor? Supposed to be smooth slow acceleration. If you don't shut off the scanner before you let off the gas, you will get some lean spikes. Just smooth them out with the hand smooth function.
 

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My other car has wings
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Discussion Starter #16
No, not mashing to the floor, trying to be very slow and deliberate with the throttle and glancing at the hit histogram while logging. Been doing only accel runs to hit the cells and holding the throttle at the manifold pressure I'm targeting. Basically I start at an RPM say 1200, then depress the pedal to hit a manifold pressure, 60kPa for example and then let it take data while accelerating at a constant throttle setting. Doesn't take long for the car to accelerate thru the cell so I just hold the throttle and let it take data at the next highest RPM too and so on up the scale. Thought about using the brakes......
 

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Bumping your thread, since i just loaded up hptuners on my car to find out it has been tuned. The comment section says its a speed density tune.

My dynamic airflow is set to 100 and 0. So its always in MAF? Doesnt that counter the description of the tune? Lol.

LTFTs are disabled with 284ect temp setting.

Power enrichment is set to 0, so always looking in the eq ratio table?


Anyone have recommendations on dual widebands? I would prefer a single display gauge.
 

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Are you using HP Tuners? Wideband or LTFT's? I have a couple pointers as I dyno tune my own car.

Using a wideband will yield the best results, look around for shops that rent dyno time. I rented 2 hours for $150 and got the bottom end dialled in first and worried about WOT later but was able to do all of it in two hours. The higher the gear the more MAP you'll be able to achieve under load, I can send the set up for the AFR Err VE/SD table if you like. Just PM me
 

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Are you using HP Tuners? Wideband or LTFT's? I have a couple pointers as I dyno tune my own car.

Using a wideband will yield the best results, look around for shops that rent dyno time. I rented 2 hours for $150 and got the bottom end dialled in first and worried about WOT later but was able to do all of it in two hours. The higher the gear the more MAP you'll be able to achieve under load, I can send the set up for the AFR Err VE/SD table if you like. Just PM me
Yes hptuners. I uploaded the tune from the ecu. It was not the stock tune.

I dont have a wideband yet, thinking aem x series and get two since my midpipes have cats and ill need to place them in front of those.

LTFTs are disabled in my current tune. No idea who tuned it previously.
 
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