jimbo1111

Wouldn't a maf meter sized to the same specs as a afm work ?

snappy

Two Quick Questions:
Who in the top 10 RWHP numbers on this list is running an AFM instead of the MAF?
If not, who is running AFM with numbers close to the 10'th place?
tia..

ehall

OOHH! I know this one! NONE OF THEM! I've yet to see an AFM dyno over 260. I'd like to see one, but i haven't.

snappy

hmm , now was i asking a question or did i make a statement

I should go on a holy quest to be the first in the top ten running a AFM and not a MAF.
now where did I put that ACME turbo 10000?

ehall

now where did I put that ACME turbo 10000?

I don't know.

Ofcourse if you end a sentence with a question mark, it's possible someone might answer the question.

UK952

I still run an AFM and I am putting out over 260 - do I win a prize?
Tony

jimbo1111

The problem with the afm is that you can't install larger injectors using it. With a k26/8 and stock injectors some might be able to get 290 or so rwhp.

UK952

Yes you can i run 55lbs and I run a K27/8 a friend of mine runs 55lbs on a K26/8 and makes lots of torque - both running guru chips, with the standard turbo( for an S) his fuel curve is spot on.
My fuelling isn't quite right but its not that far out. Admitedly with a MAF you should get better response and you can fine tune if there is a controller.
Tony

Tomas L

I have used Siemens #72 injectors with the stock AFM, no problems.

ehall

yes. You get 3 of these
and one of these V

UK952

Ouch! They dont look very cool.
Actually I am just over 300RWHP but my last Dyno was just under. Davids car with the standard K26/8 and AFM made a flywheel figure of 370ft/lbs, and it was just after the dyno was calibrated. Dyno is Dynodynamics load dyno rated to 1750BHP, now also used by EVO magazine. It is a tough dyno to get high numbers out of, standard cars almost always produce less than the factory figures there.

As a comparison on another (less acurate) dyno the year before my car made over 300RWHP with fewer mods and lower boost - (though a standard boxster S made 250BHP on the same day). It was tough for some losing over 35BHP no mods just different dyno for the shoot out, but we are happy that we now have a decent accurate repeatable reference.

So you can get power with the AFM but my next mod is likely to be a MAF - will be interesting to see the difference.

Tony

jimbo1111

Very interesting. Did you scale back the injector duty cycle? If you did than it's just like running stock injectors. The Afm has a limit as to how much hp it can produce. Once the afm is maxed out thats it. Maf has the ability to spread out load with every injector change. Allowing you to run larger injectors correctly. The problem is that the maf's that are typically used are not sized exactly the same as a afm. If they were. One would not have to tune a thing because the late afm used in our cars has a linear air flow pattern just like a maf. If someone had the resources to build a maf meter from scratch and size it exactly like the afm we wouldn't need a piggyback or chips to make the swap. All one would do is swap out what ever injector you want to install up to 72lb and the maf would correct the load and look up for each one.

ehall

Ouch! They dont look very cool.


lol

Tomas L

What can I say, we have had this discussion before and I have no hope on convincing you this time on how way off you really are so I won't even try. I don't know if Fast951 or TT has any patience left so they might give it a try once again.
For the record though, the only correct statement you make is this
And just for clarity it should be added that exactly the same holds true for a MAF and every other flow metering device.

theedge

The best MAF is no MAF at all! Then of course im not using anything of the stock Motronic. I could use a MAF, but why bother.

That reminds me, I gotta get around to ordering that $40USD MAP sensor so I can go over 21PSI at some point....