Proper Use of MAF Transfer Table - RE VMP 5000 - Sanity Check

[Weedwaka]

Hello,

I am setting up a 2002 Mustang GT with a VMP 5000 slot style maf in a 2.8" blow through before the throttle body and VMP has kindly provided data in the form of their transfer function tool to set this up.

The issue I am having is the g/s numbers are too large for the HPT software to accept above 733 counts. Its maxed out and reverts to a default number on all cells above this. This has me thinking I am using this incorrectly.

This is the table from VMP I am using which allows you to adjust the points in yellow (Maf housing size and voltage).

https://drive.google.com/file/d/1Kks...ew?usp=sharing


Can anybody give me a shove in the right direction.


Thanks in advance.

[Tom @ Overdrive]

https://www.efidynotuning.com/scaling.htm

Read through this.

I just did a VMP5000 in a 3.75" tube with id1050 injectors. You'll need to dig around but most of the mentioned tables exist in HPT.

[Weedwaka]

Thanks Tom.

Did you find the VMP transfer function to be accurate or is it best to use one of the PMAS transfer functions ?

[mstang_man]

that PMAS table lbs/min needs to cut in half, you have 63lb limit on the 02-04 mustangs i would actual multiply it by.4 then start tuning from there.. unless your scaling your injectors, manifold volume, and engine displacement..

[Weedwaka]

Thank you for the feedback on this.

I scaled the MAF transfer table from VMP , injector tables, CID Displacement and manifold size as well as the MAF Failure Load table and the Airmass TPS Failed table using a multiplier of .425 and the write up from Toms link above.

I *think* I got all of these correct. The names are not the same but the functions seem to be.

[mstang_man]

i i didnt see your injector sizes, but 02 mustangs are lbs per min airflow. i would only scale the MAF and leave everything else alone, it makes tuning a little more time consuming, but in the long run less chance of peaking out. i attached your VMP file with scaled LBS/MIN and graphs of the curves I would use the 2.75 curve to start. it just depends on how much tuning you like to do. i find it easier not to scale unless absolutely necessary..

[Weedwaka]

We have the Injector Dynamics ID725's in this car. Can you please try the attachment again. (Edit I see it). I will review this thanks for taking the time to post that.

[mstang_man]

I have the ID's in SCT Values, if you use the chart from there website you should be good.

[Weedwaka]

OK . I used ID725 data from their PNP files - Returnless - and multiplied these by .425 to match the other tables and settings.