MAF Transfer Function
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
MAF Transfer Function
Is there anyway to change the default MAF transfer function? TunerStudio doesn't do it and I have looked through the setting files for megatune. I thought it could be changed with programming, but I can not find it.
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FixItAgainTony
- Helpful Squirter
- Posts: 82
- Joined: Thu Feb 03, 2005 1:09 pm
Re: MAF Transfer Function
The current software set does not have a setting to update it, although it is just another table similar to CLT and IAT tables.
- Charles.
- Charles.
Fiat - A great car for those who like to walk.
Re: MAF Transfer Function
Yea I know how to adjust that table. I got my car started and idling the other day. Just I have increased the correction % from 130 to 170. I know the transfer function for my MAF sensor so I wanted to program that in so the flows would be closer.
Also, when using MAF only does it matter what the fueling algorithm is set to or should it be changed to alpha n mode?
Also, when using MAF only does it matter what the fueling algorithm is set to or should it be changed to alpha n mode?
-
FixItAgainTony
- Helpful Squirter
- Posts: 82
- Joined: Thu Feb 03, 2005 1:09 pm
Re: MAF Transfer Function
Just leave the fuel settings for speed density
Fuel Settings > Injector Control > Speed density
but change the signal source to MAF in the settings.
Fuel Settings > MAP vrs MAF usuage
MAF uses the speed density algorithm, but forces Ve = 100 because there is no longer a need to a have a Ve table to estimate the % filling of the cylinders; the actual air flow into the engine is known. If you use the RPM settings for blended operation of MAP / MAF, the switch can be seen in the logs - Ve = 100 when running MAF. The RPM > X settings seem reversed to me - I had to play with it for a bit to get things to work out the way I expected.
My car runs much better with this set up - much smoother through acceleration / deceleration transitions.
- Charles.
Fuel Settings > Injector Control > Speed density
but change the signal source to MAF in the settings.
Fuel Settings > MAP vrs MAF usuage
MAF uses the speed density algorithm, but forces Ve = 100 because there is no longer a need to a have a Ve table to estimate the % filling of the cylinders; the actual air flow into the engine is known. If you use the RPM settings for blended operation of MAP / MAF, the switch can be seen in the logs - Ve = 100 when running MAF. The RPM > X settings seem reversed to me - I had to play with it for a bit to get things to work out the way I expected.
My car runs much better with this set up - much smoother through acceleration / deceleration transitions.
- Charles.
Fiat - A great car for those who like to walk.
Re: MAF Transfer Function
What about the spark table and A/F ratio table. It says it uses MAP so it must estimate a value. Do you know how MS does this? I know in the ford EEC its a ratio of air in to how much air can fit in the engine or cylinder (not sure which one yet)
Re: MAF Transfer Function
Yes MS estimates the pressure the same way. It is standard to use the ideal gas law to convert MAF to MAP and vice versa.