haked MAF for ka24de(t)

Post by **slipsr20** » Tue Aug 05, 2003 7:54 am

I guess I can't wait any longer! just got a nice T3 turbo and will be getting my log style mani from jgs shortly! but on with the subject; was wounding, HOW DO YOU MAKE THE HAKED MAF????I remember that someone writting up on it a while ago but can't find it!:( Also would this be ok for a re-tune ecu?(jwt)How much retarding on the timing?would I be benifitting anything from this?I would have 550cc w/ walbro 255lph, nimo fuel pressure regulator, Fm intercooler.No fmu or Super afc! because I am getting a re-tune ecu!!!!

I'm out

:help

Post by **Nathan** » Tue Aug 05, 2003 7:54 am

Run a search here, but esecially on http://www.freshalloy.com there are several threads about it thtere

Post by **TomsMR2** » Tue Aug 05, 2003 7:54 am

the hacked maf is a replacement for the jwt ecu..

Post by **Nathan** » Tue Aug 05, 2003 7:54 am

Kinda...its a poor replacement in the fact that it does nothing to alter timing, it ONLY adjusts for the larger injectors but keeps stock maps for everything. It's not bad for a lower boost (under 300hp) setup IMO.

Post by **:: orion ::** » Tue Aug 05, 2003 7:54 am

The "Hacked MAF" is a replacement for the S-AFC, if anything.

The best way to approximate a hacked MAF for 550s will be to use 2 identical MAFs and 2 filters, with a Y-pipe. Plug one MAF in, leave the other untouched. So you have injectors twice the size, and the ECU reads half the air...almost a perfect compensation, in theory.

Personally, I wouldn't use it for more than ~250rwhp (or with anything more than 370s), or about 9psi from you T3. I was running lean with 8psi from a T3/T4 with a hacked MAF and 370s...

And with the turbo ECU my spool is noticeably better, off boost driveability improved, and the car is smoother across the board...you can't replace proper timing and fuel control.

Later - Brian

Post by **FrEaK** » Tue Aug 05, 2003 7:54 am

Hack MAF,s if anything like chipping a honda ecu requires the reprogramming of the PROM chip, which reqquires fooling with hex values.. if you know what your doing, or someone who knows what their doing then it can work excellent for a low cost alternative...

Post by **huguetpj** » Tue Aug 05, 2003 7:54 am

FrEaK wrote:Hack MAF,s if anything like chipping a honda ecu requires the reprogramming of the PROM chip, which reqquires fooling with hex values.. if you know what your doing, or someone who knows what their doing then it can work excellent for a low cost alternative...

Nope. Burning the ROM chip would be what JWT does. No need for that with the hacked MAF.

Post by **Red Lightning** » Tue Aug 05, 2003 7:54 am

This link is the hacked s14 maf thread on FA

Post by **AceInhole** » Tue Aug 05, 2003 7:54 am

:: orion :: wrote:And with the turbo ECU my spool is noticeably better, off boost driveability improved, and the car is smoother across the board...you can't replace proper timing and fuel control.

Well, you can come close to replacing proper timing and fuel control.... which is the point of the hacked MAF. I wouldn't run it with much larger than 370's though.

Timing becomes the problem going past like 10psi or so..... and there's gotta be a cheap way around it that no one has thought of, yet :p

Post by **WDRacing** » Tue Aug 05, 2003 7:54 am

MSD boost/timing retard...Thats the cheapest way I know reducing timing under boost.

WD

Post by **bruinbear714** » Tue Aug 05, 2003 7:54 am

[quote=" :: orion :: The "Hacked MAF" is a replacement for the S-AFC, if anything.

The best way to approximate a hacked MAF for 550s will be to use 2 identical MAFs and 2 filters, with a Y-pipe. Plug one MAF in, leave the other untouched. So you have injectors twice the size, and the ECU reads half the air...almost a perfect compensation, in theory.

Personally, I wouldn't use it for more than ~250rwhp (or with anything more than 370s), or about 9psi from you T3. I was running lean with 8psi from a T3/T4 with a hacked MAF and 370s...

And with the turbo ECU my spool is noticeably better, off boost driveability improved, and the car is smoother across the board...you can't replace proper timing and fuel control.

Later - Brian[/quote]

We have a winner!!!! Except for one thing....

Suppose you have the stock setup, 1 MAF, 270cc injectors. For simplicity, let's say your injector duty cycle is 50% for a MAF reading of 1V, and duty cycle is 100% for MAF reading of 2V.

Now, if you have a Y-pipe with only 1 MAF plugged in, you will get half the reading. So instead of reading 1V, you now read 0.5V and that will drop the duty cycle to 25%. Doubling the injector size from 270 to 540cc (550cc is what's available) will correct the amount of fuel entering the cylinders.

Now this sounds like a perfect solution, but the fault here is that it assumes the system's behavior to be LINEAR. However, the MAF's response may be linear up to a certain air flow rate. Using a Y-pipe with 1 MAF connected may allow the system to operate in that linear region and never reach the non-linear region, in which case it would work perfectly.

Post by **PMan_S13** » Tue Aug 05, 2003 7:54 am

does anyone know if the s14 MAF can be put onto an S13?

Cause I was thinking putting 370cc injectors on my car but I don't want to go broke on tuning it..

..and in case everyone doesn't know the s13 maf looks like a royal pain to hack.

Post by **DriFt3r** » Tue Aug 05, 2003 7:54 am

will the same thing work with 72/hr injectors?

Post by **:: orion ::** » Tue Aug 05, 2003 7:54 am

I strongly urge all of you to use this with no bigger than 370cc injectors...

Any more fuel opens the door to much higher HP from more boost, and for that you need timing control. And with the proper size MAF inner diameter, you'll max the airflow reading at less than 10psi anyway...way less than the max of 555s or 72lb'ers.

And you can't have a much larger hack...there's already enough innacuracy introduced that any bigger then 3" IMO will drive for s***.

ALSO: On the dyno I found that the theoretical ID needed to run 370s is too big - It should be 2.8711" ID to be perfect, but mine at 2.875" was quite lean, as in 15:1 or so under boost.

2.75" is still a little on the lean side, although not too bad - And that only a 26% increase in cross sectional area, not the 37% that 'should' be used...

Just some words of caution...this is good solution to get a KA-T on the road cheaply, and seemingly safely. But if you want big power, you gotta "pay to play".

Later - Brian

Post by **cosmo** » Tue Aug 05, 2003 7:54 am

would a Greddy E-Manage with the injector controller be a better solution to the hacked MAF?

Post by **PMan_S13** » Tue Aug 05, 2003 7:54 am

Let me try that again.. I think I got skipped over..

Can the s14 maf be put on an s13?

Post by **:: orion ::** » Tue Aug 05, 2003 7:54 am

One guy has tried it, and it seemed to work...but it's still speculative. He's running rich, and his idle sucked before the new MAF, so it's a bad case study.

They do have the same in-out on the AFC...hhhmmmmmmm.

- Brian

Post by **PMan_S13** » Tue Aug 05, 2003 7:54 am

I guess I could swap with my buddies wrecked s14's maf for a day and test it.. see how it turns out..

hey btw, I think I have a way to measure the s13 maf but I am still worried about actually being able to cut it apart since it is made of metal. Is that another obstical or am I just imagining it? Cause it sure seems like getting to the sensor it self would be more trouble that it's worth.. but I'll see what you guys think

Post by **redamnavit** » Tue Aug 05, 2003 7:54 am

Has anyone tried the S14 MAF on an S13 KA since this question was asked?

Post by **:: orion ::** » Tue Aug 05, 2003 7:54 am

Yes, and it's not a direct swap.

Idles sucks, and driveability is horrible. I'd bet the voltage curves are way to different for it to work...

- Brian

Post by **Redline240** » Tue Aug 05, 2003 7:54 am

At what point will a hacked MAF be maxed out? Forget about tunning and size of injectors, i have a safc and just want to use a hacked maf so that my stock one doesn't bottle neck everything...whats the estimated max hp for it?

Redline

haked MAF for ka24de(t)

haked MAF for ka24de(t)

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