This is a discussion on maf hack questions? within the Tuning: Electronic Engine Management forums, part of the Tech & Modifying & General Repairs category; hi guys so last night i was monitoring my car just gone for a drive the car was pulling like ...
hi guys so last night i was monitoring my car just gone for a drive the car was pulling like never before reason being that i finally got everything on the tune right eg no knock, iam is stable, good afrs etc etc
so i did a wot in 3rd for ****s and gigs and geuss what my maf maxed out cel came on maf sensor to high and it hit the 300 g/s 4.72v limit and when it did my afrs got suddnly droped after 6000 from 10.9 - 9.9 at 20psi so now i have to do the maf hack but theres not much info about thisn and yes i have read the thread on the maf hack but i still got a few qeustions
- would i benifit on this hack with a aps 65mm intake or do i need a bigger maf housing? (btw the whole maf has been rescaled)
- what excatly do i multiply my values by 0.5
injector scailing and latency
i know theres more but can someone point em out?
- do i need too raise/change the voltage on the maf scaling? i know the max is 5v but mine is set at 4.72v
- when halving the maf values is there quicer way of doing it? or do i have too half each cell individually?
"As you can see, at 4.96V we're only at 176g/sec. We could effectively increase this to 300g/sec if a bigger MAF housing is fitted. And since we've cut all values by half, this would actually correspond to 600g/sec true value."
If you don't understand exactly whats happening then I don't suggest doing this. You need to slow down and actually absorb the info instead of just briefly skimming it. You half the G/S not the voltage,in the MAF scaling. Any table that has a load reference you need to change. Obviously the timing tables. There are also several tables that have yet to be defined in Romraider/Ecuflash that probably reference load. So this "hack" isn't 100%.
NASIOC - View Single Post - 300g/s workaround - 'hacked' MAF up to 600g/sec or 1200g/sec
Also I remember from somewhere there are a few JDM 2.0L 16bit ECU STI's whose MAF scaler is hard coded to 400 g/s instead of the 300 g/s. The G/S are set at 300 g/s in the ROM's just like the 32 bit ECU's but the ROM will allow you to change the value to 400 g/s. Or you can just us the Groupe-N ROM (Carberry) and just run speed density and ditch the MAF altogether. No massive value change needed.
Last edited by Donkey; 10-11-2012 at 06:40 AM.
you can't just half maf alone, you gotta half the scalars in your timing tables and afr tables and injector scalar and you would still have the same issue (if you are maxing out to 5v), you need a bigger maf housing.
Last edited by Donkey; 10-15-2012 at 05:01 AM.