MAF Scaling - Open/Closed Loop Fueling info

[Kodename47]

I just wanted to add here, as I couldn't see it in the OP at a quick scan.

When MAF scaling, ensure you remove any data when the coolant temp is below 70C (160F) as fueling compensations are active and will skew data. If you don't log coolant temp, then don't log until at least 5 minutes of actual driving. Hint: Log coolant temp

[steve99]

Originally Posted by Kodename47

I just wanted to add here, as I couldn't see it in the OP at a quick scan.

When MAF scaling, ensure you remove any data when the coolant temp is below 70C (160F) as fueling compensations are active and will skew data. If you don't log coolant temp, then don't log until at least 5 minutes of actual driving. Hint: Log coolant temp

Thanks
added that info to first post

[Wayno]

Originally Posted by Wayno

Thought I'd share this here.

So far I've seen the MAF sensor having one of only THREE behaviors in OL on Australian cars with stock intake.

If you wish to ignore CL and use the OTS 2.0 Stg2 petrol MAF scale, then maximizing power in the shortest time possible should simply be a matter of plugging in the correct adjusted MAF scale.

(I say shortest time possible, but this is 6 months worth of going in circles).

TYPE 1
The lucky few who have near perfect AFR's on OTS tune.
No correction required except smoothed MAF scale slightly - 1% leaner at 3.2V, 3.9V and 4.0V.

TYPE 2
Starts going rich after 4.0V MAFV or 6400-6800rpm, right before peak power so it hurts your dyno number.
Corrected with "v77.NT1" MAF scale - 1% leaner at 3.2V, 1% leaner at 3.9V, 3% leaner at 4.0V, 5% leaner after 4.2V.

TYPE 3
Farkin rich all over but extremely rich at 3.2V and after 3.8V MAFV.
Usually accompanied by engine load above 1.3g/rev resulting in a fake lean lump around 6000-6800rpm where it's hitting the load limit. It still makes decent power at 6800, purely by accident and sucks everywhere else.
Corrected with "v76.AT1/v77.AT1" MAF scale - 6% leaner at 3.2V, 4% leaner at 3.9V and 4.0V, 5% leaner at 4.3V.

TYPE 1 Examples:
(MT) 1:
http://datazap.me/u/toy-sooby/3rd-ge...2-3&zoom=0-107
(MT) 2:
http://datazap.me/u/deanveljkovic/86...2749&mark=2713
(MT) 3:
http://datazap.me/u/deanveljkovic/ky...zoom=4149-4280

TYPE 2 Examples:
(MT) 4:
http://datazap.me/u/lipton54321/log-...1060&mark=1022
(MT) 5:
http://datazap.me/u/notrq/custom-ww-...0-462&mark=423

TYPE 3 Examples:
(AT) 6:
http://datazap.me/u/praneetn7/stg-2-...zoom=5263-5359
(AT) 7:
http://datazap.me/u/wayne/206-stg2-u...&zoom=893-1084
(MT) 8:
http://datazap.me/u/ethsgreygts/wayn...&zoom=907-1082
(MT) 9:
http://datazap.me/u/supernom/e85-pul...63&mark=68-112

OTS scales are quite lumpier than stock.




I smoothed the OTS scales for MT, richening up where they're lean on Stg1 and leaning up where they're rich on Stg2.




AT (lumpy again) vs MT (smooth) for petrol.




Smoothed scale vs NT1 for E85 and AT1 for E85.

[steve99]

might add that to first post thanks @Wayno

[efactor84]

So if I cannot get my MAF Voltage to read data off my OpenFlash Tablet, I'm pretty screwed until Shiv updates their software, correct? My current file is D00D

[steve99]

Originally Posted by efactor84

So if I cannot get my MAF Voltage to read data off my OpenFlash Tablet, I'm pretty screwed until Shiv updates their software, correct? My current file is D00D

correct your snookered untill you can log maf volts

you could probably do the open loop ie higher end of scale manually using afr and commanded afr

[efactor84]

Originally Posted by steve99

correct your snookered untill you can log maf volts

you could probably do the open loop ie higher end of scale manually using afr and commanded afr

I'm still waiting after updating my tablet from Openflash with the new logs, but no luck with MAF Voltage or IAM. Hopefully Shiv is on this issue. I did some logs, but I cannot do anything right now. My LTFT is sitting between +3-5% with Stage 2 UEL, which is kind of frustrating. I was thinking about using my stock scale and paste it on the Stage 2, sinced the MAF voltage and the Engine g/s are different to see if it would change based off Mishimoto claiming no tune required. Here is a comparison. The temperature for my IAT was reading between 93-96F. My main goal is to get the LTFT to sit -2/2+. Otherwise I'll have to wait for Vishnu Performance to come up with the update for CAL ID ZAJ1D00D to get the MAF Volt and IAM readings.

[steve99]

Originally Posted by efactor84

I'm still waiting after updating my tablet from Openflash with the new logs, but no luck with MAF Voltage or IAM. Hopefully Shiv is on this issue. I did some logs, but I cannot do anything right now. My LTFT is sitting between +3-5% with Stage 2 UEL, which is kind of frustrating. I was thinking about using my stock scale and paste it on the Stage 2, sinced the MAF voltage and the Engine g/s are different to see if it would change based off Mishimoto claiming no tune required. Here is a comparison. The temperature for my IAT was reading between 93-96F. My main goal is to get the LTFT to sit -2/2+. Otherwise I'll have to wait for Vishnu Performance to come up with the update for CAL ID ZAJ1D00D to get the MAF Volt and IAM readings.

no need to mess with that maf temp compensation table.

if your fuel trims on stage 1 tune maf scaling are only +3% to +5% throught the rpm range that good also log commamded afr and afr and see if they match throughout a full throttle run. if they do then thats good as well.

I looked at a guy with mishimto intake and it was pretty close to stock scaling maf wise, for his maf sensor anyway, you might be close as well.

if your fuel trims are max 5% and afr and commanded afr follow each other pretty well you could try copying the stage1 maf scaling into the stage2 map. This will make the stage 2 map run LEANER than intended but oft tunes tend to run on the rich side. If your on good 93 fuel you may be able to do this. again check for knock and check the fuel trims and that commanded afr and actual afr are following each other on wot runs.

if that looks ok then fine, if the afr and commanded afr dont follow you can still ise the vgi tool to do the open loop maf scaling to correct that as it just needs ltft commanded and actual afr and your ol fuel table.

then if its all still ok try the mishimoto intake if its same type as the guy i did they are prety close to stock maf scaling wise, you might have to tough up the ol maf scale again.

it wont be ideal without doing the closed loop scaling but if trims are only 5% that probably good enough untill you get the extra logging

[efactor84]

Originally Posted by steve99

no need to mess with that maf temp compensation table.

if your fuel trims on stage 1 tune maf scaling are only +3% to +5% throught the rpm range that good also log commamded afr and afr and see if they match throughout a full throttle run. if they do then thats good as well.

I looked at a guy with mishimto intake and it was pretty close to stock scaling maf wise, for his maf sensor anyway, you might be close as well.

if your fuel trims are max 5% and afr and commanded afr follow each other pretty well you could try copying the stage1 maf scaling into the stage2 map. This will make the stage 2 map run LEANER than intended but oft tunes tend to run on the rich side. If your on good 93 fuel you may be able to do this. again check for knock and check the fuel trims and that commanded afr and actual afr are following each other on wot runs.

if that looks ok then fine, if the afr and commanded afr dont follow you can still ise the vgi tool to do the open loop maf scaling to correct that as it just needs ltft commanded and actual afr and your ol fuel table.

then if its all still ok try the mishimoto intake if its same type as the guy i did they are prety close to stock maf scaling wise, you might have to tough up the ol maf scale again.

it wont be ideal without doing the closed loop scaling but if trims are only 5% that probably good enough untill you get the extra logging

I'm on the Mishimoto Full CAI with the tube intake which is similar to Perrin CAI setup. So just to understand, I don't need to make changes to Stage 2 UEL and copying my stock IAT and and MAF Scaling over to Stage 2 tables, correct? Here is a screen shot of the data I capture today crusing on the highway running on Shell OCT 93. If you want a copy of this data, I can email it to you.

[steve99]

Originally Posted by efactor84

I'm on the Mishimoto Full CAI with the tube intake which is similar to Perrin CAI setup. So just to understand, I don't need to make changes to Stage 2 UEL and copying my stock IAT and and MAF Scaling over to Stage 2 tables, correct? Here is a screen shot of the data I capture today crusing on the highway running on Shell OCT 93. If you want a copy of this data, I can email it to you.

Just do three wot runs and put the data into the vgi utility anddo the open loop maf scaling, it look like your on the rich side

[efactor84]

Originally Posted by steve99

Just do three wot runs and put the data into the vgi utility anddo the open loop maf scaling, it look like your on the rich side

Gotcha. So I need to hit three WOT for openloop first instead of closeloop, which should get me the MAF scale I need without the MAF Voltage working, right? What's the best way to get three good WOT?

[steve99]

Originally Posted by efactor84

Gotcha. So I need to hit three WOT for openloop first instead of closeloop, which should get me the MAF scale I need without the MAF Voltage working, right? What's the best way to get three good WOT?

flat straigh road
3 by 3rd gear runs from 2000 to redline can all be in same log vgi utility will sort it see the help in the utility.

this will only correct the open loop section of maf scale above about 3.2 volts

see the maf scaling links in my signiture

[MGPAX]

Can someone point me in the direction of a MAF scaling utility that will work with RR and my .csv files from OFT?
The one your link goes to Steve99 won't take my .csv files.
I'm consistantly running under 12 AFR from 4K to redline.
My logs look exactly like Wayno's "Type 3" MAF sensor examples.


http://datazap.me/u/mgpaxman/runup-m...8-213&mark=184

[steve99]

Originally Posted by MGPAX

Can someone point me in the direction of a MAF scaling utility that will work with RR and my .csv files from OFT?
The one your link goes to Steve99 won't take my .csv files.
I'm consistantly running under 12 AFR from 4K to redline.
My logs look exactly like Wayno's "Type 3" MAF sensor examples.


http://datazap.me/u/mgpaxman/runup-m...8-213&mark=184

it does you just have to remove the top 3 lines from OFT log files
the bit that says proceed log, ie all lines above column headers

leave just the headers ie the rpm,load,maf v ect and data and it work fine