mass air conversion

[Nutmeg911]

Anybody running a mass air conversion on their 3.2, like a gekkatec or other mass air conversion?

[wildcat077]

There's a good article in a British magazine about the Gekkatec conversion on a 3.2 Carrera,
supposed to be good for an extra 10 HP,proven on a dyno ...
I have the magazine at home but i don't remember the name off hand,maybe somebody could chime in here.

Cheers !
Phil

[Porsche84]

I ran an Autothoriety MAF on my 3.2. No difference in power as far as I could see. I sold it and put the stock unit back on.

[JeremyD]

A bunch of trouble for 10hp? Just lose a few lbs.

[onboost]

Originally Posted by Nutmeg911

Anybody running a mass air conversion on their 3.2, like a gekkatec or other mass air conversion?

Good question Nutmeg.. I'd like some input too...

Have a car here now that is 3.2 punched to 3.4, twinplug etc.. running a Split second ARC2-A MAF in place of the standard Air Flow Meter.. also appears to have eliminated the Idle control valve.

Thus far I'm not all that impressed. Have yet to get some dyno time with it.. but by ear and seat of the pants I can't seem to pick-up on any changes or improvement when setting are adjusted. Maybe old unit that needs update or piggy-back.

Anyone falmiliar with or use this unit? MAF Kits

[ths911]

I too am running the Split Second ARC2-A that was put in by the PO. There seems to be a quicker throttle response than my buddies 3.2 but that is subjective. It is very interesting on how sensitive the adjustments are and how it affects performance. I have spent quite a bit of time on the street adjusting it to run smooth at all RPMs. The nice part is the adjustment is done from the 4 knob calibrator panel you have at arms reach.

[Brando]

I was looking at the Steve Wong MAF conversion kit, but it appears the next production run will be out about the same time Duke Nukem Forever comes out.

At this time there's 2 good options:
1) Gekkatec: Works great with the stock chip, better with an aftermarket chip. It's a non-adjustable MAF replacement and mimic's the stock AFS's voltage output across the range. I believe the most you can do is add an Intake Air Temp sensor.

2) Split Second MAF: The best option as it has the 3-knobby adjuster version or the fully programmable version.

Either way, it's recommended to put a different chip in. I believe if you already have a SW chip and then switch to a MAF system you can get a new chip for your "setup" at a fraction of the price of a new one from him. Don't quote me on that, though.

[onboost]

Originally Posted by ths911

I too am running the Split Second ARC2-A that was put in by the PO. There seems to be a quicker throttle response than my buddies 3.2 but that is subjective. It is very interesting on how sensitive the adjustments are and how it affects performance. I have spent quite a bit of time on the street adjusting it to run smooth at all RPMs. The nice part is the adjustment is done from the 4 knob calibrator panel you have at arms reach.

Nice to know someone else is using one of these as well. I'm thinking of one also for a heavily breathed on M30 BMW application as well. Just need to ensure that it's worth it.

Originally Posted by Brando

2) Split Second MAF: The best option as it has the 3-knobby adjuster version or the fully programmable version.

Either way, it's recommended to put a different chip in. I believe if you already have a SW chip and then switch to a MAF system you can get a new chip for your "setup" at a fraction of the price of a new one from him. Don't quote me on that, though.

Good info.. oh, and that's a 4 "knobby adjuster" on this thing..

Low, Mid, High, and Accel.. This particular has a chip that was burned based on its mods and dyno runs when built. Not sure who's chip.. but just sorting through.

May actually be at it's best setting although it seems to have a "just off idle" flat spot when moving from a complete stop.

[Nutmeg911]

Thanks for all responses, my main interest is in replaceing the aging flapper door MAF ,but I realize the potential of a modern hot wire MAF, having a 5.0 Mustang and all.

[stlrj]

Even if you did install a MAF, you would still have to learn how to tune it to your engine to make it work right. The reason MAFs work so well on OEM cars that were designed to have them is because of their adaptive learning strategies and on board diagnostics that are built into modern electronic control units. Tuning is is part of the adaptive learning electronics and there are no external adjustments for mixture or spark advance.

The only way I would install a MAF system would be to retrofit a complete OEM injection system that was designed around the MAF ( complete with OBD ), instead of trying to splice or band aid a MAF on a AFM system that would not support the MAF electronics which would explain why these add on devices are so difficult to retrofit.

I would suggest your time best spent learning to tune your existing AFM unit to your individual engine to optimize performance instead of trying to learn to tune an incomplete MAF system. Considering how much time it would take to install and tune your engine to a new MAF system, you would likely have more success devoting that time on your neglected AFM by either replacing it or learning how to make adjustments to it.


Cheers,

Joe

[scottbombedout]

Originally Posted by wildcat077

There's a good article in a British magazine about the Gekkatec conversion on a 3.2 Carrera,
supposed to be good for an extra 10 HP,proven on a dyno ...
I have the magazine at home but i don't remember the name off hand,maybe somebody could chime in here.

Cheers !
Phil

The magazine was 911 and Porsche World. 911 and Porsche World Magazine Visit AmD.

Seems to be a good upgrade but expensive for what it is.

[twistoffat]

Originally Posted by scottbombedout

The magazine was 911 and Porsche World. 911 and Porsche World Magazine Visit AmD.

Seems to be a good upgrade but expensive for what it is.

it was issue Nr 188 November 2009 in case you need it. Someone else here has a thread where they installed it and had some issues which needed the help of the Guys who produced it....you may want to search the name GEKKATEC

[stlrj]

Originally Posted by wildcat077

There's a good article in a British magazine about the Gekkatec conversion on a 3.2 Carrera,
supposed to be good for an extra 10 HP,proven on a dyno ...
I have the magazine at home but i don't remember the name off hand,maybe somebody could chime in here.

Cheers !
Phil

10 HP! Whooopee!

Now how about low end torque and driveabilty? I seriously spend very little time, if ever, at redline where I would even see that elusive 10 HP.

[scottbombedout]

Originally Posted by twistoffat

it was issue Nr 188 November 2009 in case you need it.

Wow you are good

[cgarr]

With those little gains it does not seem to be the real bottle neck area? Just go with carbs and be done with it,,

[don911]

I'm using the autothority MAF with a custom chip from Steve Wong. I posted some dyno sheets from my car in various configurations from stock to current.

More kudos for Steve W and dyno sheets

[911st]

I suspect a lot of the gain from a MAF conversion is on the ignition side of the chip, some on getting the AFR's right, and a little from better breathing.

I might call that a tunning effect.

Some where here SW notes that with a full race exhaust, chip, on race gas a 3.2 with AFM can get to 270chp.

It that point I am not sure even a set of carbs would add 10 more HP.

I could very well be wrong.

[tcar]

Here's a thread about a guy that was here (mountains) earlier this year from the 'flatlands'.

Actually the first time I'd heard of Gekatec.

He got it fixed before it was time to go back home and before his wife disowned him for working on the car during vacation.

Altitude problem in the Rockies

[Sunriseinla]

I'm considering doing an AFM to MAF conversion? I don't like the idea of running "blind" at a very crucial area on the rpm/load map (WOT > 5200rpm).

I have a HFM5 from a 250HP VW R32 (Part No. 07D906461). This should be the perfect size and the IAT seems to have the same transfer function as the stock IAT. I still need to verify this.

Now comes the tricky part... changing the code in the motronic...
Has anyone done this and succeeded? The obvious stuff (AFM transfer function, basic inj/ign maps, accln enrichment...) I think I can handle. The problem comes when the density of the air changes i.e. changes in IAT and changes in altitude. The motronic is expecting volume flow but is getting mass flow... Is this negligible?

[joeblow]

3.2 carreras like MAFs. The 10HP hohum comments are funny because that is the difference in many autocross wins etc... but besides that the real gains on the 3.2 are in the mid range. The more you have done to the car the more you will see from the MAF as well. Throttle response is night and day if tuned right.

I never liked the chip based MAF kits and having had the ARC2 and other adjustable piggy back units on cars before I found I could get more than my competitors with fixed chip systems.

My favorite 3.2 bolt-on setup was headers, sport muffler, BOSCH MAF with piggy back of choice, Biggest cone filter you can fit, 3.5 BAR fuel pressure regulator (BMW) or adjustable, slightly advanced cams, aluminum flywheel and pressure plate with a 5 puck sprung disc. This was enough to take out many 3.6ltr cars.