MAF value changing on own

Used only on the 03/04 Marauder but can be used on any 03/04 ecu with code changes. Uses newer style SCP array so will not control cluster correctly on 2004 and older fords that use the older style SCP array such as mustangs.
p4ndiamond
Posts: 40
Joined: 2021 May 09, 14:12
Location: Ruston Louisiana
Vehicle Information: 2004 Mercury Marauder DTR
1997 Mustang Cobra
1998 Mustang Cobra
2021 Mustang Eco Boost
1989 foxbody hatch

MAF value changing on own

Unread post by p4ndiamond »

Have an issue in the tune.

Preparing to run a VMP HPX maf .

In the tune file im on RZASA 190312

It will not accept Kg/hr numbers larger than what its forcing a value of 1745.4 Why is this and what can i do to eliminate this problem in the file to properly match the MAF sensor being used ? I can type the values in , save them , but revisiting it changes those values and pegs them at that.
Screenshot 2021-09-16 010551.png
decipha
Posts: 5024
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: MAF value changing on own

Unread post by decipha »

your xdf is 2 years old.

download the latest it uses the k constant so no worries.
p4ndiamond
Posts: 40
Joined: 2021 May 09, 14:12
Location: Ruston Louisiana
Vehicle Information: 2004 Mercury Marauder DTR
1997 Mustang Cobra
1998 Mustang Cobra
2021 Mustang Eco Boost
1989 foxbody hatch

Re: MAF value changing on own

Unread post by p4ndiamond »

Will do. I think i tried that one before and ran into the same issue which is why i reverted originally. Does the K constant allow me to place the true values from the maf table ?
decipha
Posts: 5024
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: MAF value changing on own

Unread post by decipha »

You were clipping the max limit in the maf. If you have larger injectors that value will be higher with the k constant.

Read the fuel write up.
p4ndiamond
Posts: 40
Joined: 2021 May 09, 14:12
Location: Ruston Louisiana
Vehicle Information: 2004 Mercury Marauder DTR
1997 Mustang Cobra
1998 Mustang Cobra
2021 Mustang Eco Boost
1989 foxbody hatch

Re: MAF value changing on own

Unread post by p4ndiamond »

Thanks i just saw that it was updated.

I am running 52lb ford racing injectors @60psi

So i updated the XDF and changed the K constant to 30 .

I edited MAF data , sar, high and low slopes.

The maf is the only one that seems to scale down with a max and the scale percentage is around 1.9%

so from there I can dial in the tune or is there another step i must take ?
decipha
Posts: 5024
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: MAF value changing on own

Unread post by decipha »

you have to do the injector data first

maf will be acrual values now, there is no visible scaling with the k constant

nah thats it

you did update all the sp** parameters correct
p4ndiamond
Posts: 40
Joined: 2021 May 09, 14:12
Location: Ruston Louisiana
Vehicle Information: 2004 Mercury Marauder DTR
1997 Mustang Cobra
1998 Mustang Cobra
2021 Mustang Eco Boost
1989 foxbody hatch

Re: MAF value changing on own

Unread post by p4ndiamond »

All SP parameters appear to be updated. for maf-t does the sp** maf-t and the non SP need to be updated ? i only updated the non SP for that
p4ndiamond
Posts: 40
Joined: 2021 May 09, 14:12
Location: Ruston Louisiana
Vehicle Information: 2004 Mercury Marauder DTR
1997 Mustang Cobra
1998 Mustang Cobra
2021 Mustang Eco Boost
1989 foxbody hatch

Re: MAF value changing on own

Unread post by p4ndiamond »

The kg/hr table clips maf value at a max of 3320.2 now.
All values lower appear to properly reflect the table from this default transfer.

https://drive.google.com/file/d/1Kksy4U ... pDYAT/view
decipha
Posts: 5024
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: MAF value changing on own

Unread post by decipha »

the sp** maf transfer is what you need. The comments should tell you that.

that limit sounds correct for your injectors.
p4ndiamond
Posts: 40
Joined: 2021 May 09, 14:12
Location: Ruston Louisiana
Vehicle Information: 2004 Mercury Marauder DTR
1997 Mustang Cobra
1998 Mustang Cobra
2021 Mustang Eco Boost
1989 foxbody hatch

Re: MAF value changing on own

Unread post by p4ndiamond »

cool deal. I've updated that one also now.
When dialing in fuel i should update SP** maf transfer only or both ?
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