How to get proper MAF transfer function?

[xtreme_exploder]

I decided to get into tuning my car myself and I have a 123mm MAF housing with a 05+ Ford slot sensor (Whipple crusher setup). How do I get an accurate transfer function that I can plug into my tune? If someone has this, obviously that would be sweet. But just having the factory MAF function from a GT500 or something and doing the math for my setup should work. These guys PMAS have awesome transfer worksheets right on there website, and they look like Ford sensors. Can I use that info, or is it way different than the OEM Ford? I guess I could ask them directly. Also, could I send my meter somewhere to get it flowed with a transfer sheet?

 

[01yellercobra]

What MAF are you switching from? Are you just going to a larger pipe? If so you can scale the MAF transfer by the percentage difference. You'll still have to tweak the tune to get things dialed in perfectly.

 

[Don 95Vert]

The best way to do it is just do it from scratch. I have tuned hundreds just like that and no two are exactly the same - some are really far out. It may seem tougher, but it isn't - you'll probably spend less time doing it yourself and doing it right rather than correcting someone else's MTF.

Don

 

[Uglywolf]

The best way to do it is just do it from scratch. I have tuned hundreds just like that and no two are exactly the same - some are really far out. It may seem tougher, but it isn't - you'll probably spend less time doing it yourself and doing it right rather than correcting someone else's MTF.

Don

Good topic. When using the '05+ slot style would you start with the base GT transfer function and scale up from there? If so, about how much for his 123mm tube?

Thanks!

 

[Eric@HPTuners]

Since you are using the stock sensor, take the stock transfer function and correct it by the difference in inside diameter.

so 123mm/original size will give you a correction factor to multiply by. Should get you close. I don't recall what stock is on those.

 

[xtreme_exploder]

Haha I should have specified that this is on an 03 Cobra, so it's not the stock sensor. I don't know what the stock transfer function is for a newer slot-style sensor car.

 

[Eric@HPTuners]

Here you go.

 

[xtreme_exploder]

Awesome! And what meter is this through? 05 GT, GT500, etc?

 

[Eric@HPTuners]

2005 Mustang GT

The GT500 electronics are the same

 

[xtreme_exploder]

Cool, I was just making sure of the size of the meter. This helps me a lot! Also, what are the airflow units posted (lb/min, etc.)?

 

[Eric@HPTuners]

Cool, I was just making sure of the size of the meter. This helps me a lot! Also, what are the airflow units posted (lb/min, etc.)?

Yeah, lbm/min

 

[Blakonblak94]

I have a slot Maf spreadsheet that gives voltage and flow values based around a stock sensor and varying tube sizes, for future reference for anyone needing it.

 

[Eric@HPTuners]

I have a slot Maf spreadsheet that gives voltage and flow values based around a stock sensor and varying tube sizes, for future reference for anyone needing it.

For which sensor?

 

[Blakonblak94]

Ford 3L3A-12B579-BA I do believe.

 

[Uglywolf]

I have a slot Maf spreadsheet that gives voltage and flow values based around a stock sensor and varying tube sizes, for future reference for anyone needing it.

I'd be interested, should I PM my E-mail address?

 

[xtreme_exploder]

Me too!

 

[Blakonblak94]

Anyone who would like it just shoot me a PM with email. I work all day so I can email it later. I don't 100% remember who actually calculated the spreadsheet, but it tracks within 1% or so and works beautifully. So its not my doing buy I believe the original copy of it has disappeared. Just shoot me a PM.