Tuning Knowledge = Power

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RRT
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Re: Tuning Knowledge = Power

Post by RRT » Sat Dec 29, 2007 8:10 pm

Hey DYNOWOG, whats your approach on building transfer functions for the maf. I have been taught a few ways and seen many a ways done. If you dont wanna reveal this over the internet no worries just kinda curious. Thanks
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PMAS
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Re: Tuning Knowledge = Power

Post by PMAS » Sat Dec 29, 2007 8:15 pm

Hey that is a very good subject how do we aproach building transfer functions

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Re: Tuning Knowledge = Power

Post by DYNOWOG » Sat Dec 29, 2007 10:59 pm

RRT wrote:Hey DYNOWOG, whats your approach on building transfer functions for the maf. I have been taught a few ways and seen many a ways done. If you dont wanna reveal this over the internet no worries just kinda curious. Thanks
i wish i could help with this one but the only maf reflash experiance i have is with nissans as our fords are speed density / map based

i usually remap nissans with unusual or modified mafs by using injector scaling that i know works as with all or as many constants as posible

then i will load the engine to scale the maf at all relevent points

simple but efective

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Re: Tuning Knowledge = Power

Post by Mattr66 » Sun Dec 30, 2007 12:38 am

PMAS wrote:Hey that is a very good subject how do we aproach building transfer functions
Well..... I would think you would know the most about stuff like this being intimate with MAF meters and all......lol

My guess is that you have to start with the stock curve to get the trend of the electronics and scale linearly with the ratio of the old sampling area over the new sampling area. Is that pretty close for the meter designs that have the probes dangling in the center of flow area?

I'm sure the ones that get sampling tube changes mapped is more complicated, but I guess as long as the increase in calibration is due to the tube diameter and not shape i guess that is linear as well.

Then you can change the electronic curve I guess so then that is a can of worms as well. I guess this is the best way of doing a meter to allow a big airflow number up top but still allowing a nice resolution down low on the curve for nice idle and part throttle characteristics.

Just Guesses,
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Re: Tuning Knowledge = Power

Post by PMAS » Sun Dec 30, 2007 11:20 am

How would you biuld a transfer function in the ecm without the data (or no data from meter)
1. do you shut adaptives off first
2. do you shut the feed back from o2,s so no fuel correction is done by the ecm
3. then you go in the transfer fuction and start moving the data in the kgh colum to match what meter your using and what the ecm wants too see too run
4. then turn your adaptives,o2's so you could see if the curve you made will keep fuel trims
to factory spec

Just seeing what everyone is doing :mrgreen:

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RRT
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Re: Tuning Knowledge = Power

Post by RRT » Sun Dec 30, 2007 3:00 pm

PMAS wrote:How would you biuld a transfer function in the ecm without the data (or no data from meter)
1. do you shut adaptives off first
2. do you shut the feed back from o2,s so no fuel correction is done by the ecm
3. then you go in the transfer fuction and start moving the data in the kgh colum to match what meter your using and what the ecm wants too see too run
4. then turn your adaptives,o2's so you could see if the curve you made will keep fuel trims
to factory spec

Just seeing what everyone is doing :mrgreen:
PMAS worded it better which what my question was, the best approach to building maf transfer functions with out any data. I usually just start with the stock function and build a linear scale from that until my stabilized open loop fuel table matches what the actual af is. Then of course the rescaling of injectors slopes for the bigger mafs. Seems to work good but is there any other know better ways?
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Re: Tuning Knowledge = Power

Post by Mattr66 » Sun Dec 30, 2007 4:16 pm

If I have a wideband I do just like PMAS says and shut off all 02 feeback and tune via the open loop table. The long term fuel trims work well for scaling injectors and the MAF if you have a known good MAF transfer.

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Re: Tuning Knowledge = Power

Post by HMS » Tue Jan 01, 2008 3:11 pm

Good info! Thanks for posting this.

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Re: Tuning Knowledge = Power

Post by geoffav » Tue Jan 08, 2008 2:38 pm

sniperpat469 wrote:in about 2-3 months I will have a tuning manual that should explain in detail
most of the ppc and eec ford computers.

Patrick
How close are we, I'm ready for some new reading material. Whatever you do, leave room for notes. :mrgreen:
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Re: Tuning Knowledge = Power

Post by Juggalo_X » Tue Jan 08, 2008 3:11 pm

geoffav wrote:
sniperpat469 wrote:in about 2-3 months I will have a tuning manual that should explain in detail
most of the ppc and eec ford computers.

Patrick
How close are we, I'm ready for some new reading material. Whatever you do, leave room for notes. :mrgreen:
+1 :)
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Re: Tuning Knowledge = Power

Post by bgrd351 » Thu Jan 10, 2008 3:07 pm

geoffav wrote:How close are we, I'm ready for some new reading material. Whatever you do, leave room for notes. :mrgreen:
me too!!

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