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Old 03-13-2002, 08:14 PM   #1
Rich L
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Location: near Atco(NJ) 13.566@100.64-
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1999 RS-Tw/ CobraMAF
Custom Rallispec kit/IC#1

Question Smart ppl: I need new theory on any type of MAF swap for a MY99rs-t

Im still searching for any solution for a maf swap.

**note: I am not refering to a stand alone ecu upgrade or map conversion**

I was told that the split second controller offers a possible solution, allowing you to upgrade to a compatable maf.
but the big question is which darn MAF is "compatable" !?

Mustang SVO? or Cobra? Any ideas?

Here's a abstract though...
I know the 98's hot wire maf is better but doesnt bolt on to the 99's format.

Is it possible to just swap out the hot film filament ?? (for something more durable... like a wire or stronger film from a different car's MAF)

Did Cobb tuning ever make an upgrade?
Tuners! What are the latest developements?!
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Old 03-13-2002, 08:41 PM   #2
skywalker
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Well I have had no problems with my MAF yet, knock on all kinds of wood! I also have about 12000 miles on my Turbo setup with the MAF. I just left in the stock airbox and that seems to be fine.

I also heard at one point there was a bad batch of MAF's early on in the year of the 99RS. So maybe getting a new one would fix any problems?

Just my $0.02
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Old 03-14-2002, 01:40 PM   #3
RallyNavvie
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Meanwhile on the other end of the spectrum my first MAF lasted 18k miles with the turbo, the second about 3000 miles, the 3rd about 300 miles, and the 4th about 30 miles. See where this is going?

The latest thing is the new Greddy computer. I think it's the E-Manage or something? It supposed to allow you to swap MAFs with almost any other one. Whoever is playing with it from this board is using a 93 MAF (which I think is a more durable hot-film type sensor). You may want to look up info on that system since it's priced pretty well, but still in the test phases.

~Garrett
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Old 03-14-2002, 03:23 PM   #4
Rich L
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Location: near Atco(NJ) 13.566@100.64-
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1999 RS-Tw/ CobraMAF
Custom Rallispec kit/IC#1

Default MY99 MAF... life's biggest mystery.

Me personally....
Im on my 5th maf.

Just as with RallyNavvie, they seem to last for shorter duration...
and I know I blew 2 mafs bouncing off the rev limiter in first gear.
(no witty comments please)
-and the other 2 mafs blew under strong 4th gear accelleration.

but I do have the "safer" intake setup. (retaining the first stock box, my IC replaced the second box) plus my airfilter is dry as can be... So am baffled.

You would have though someone would have made a successfull swap by now. (Cobb tuning help!)

I lean toward the turbulence theory... and wonder if one's turbo setup could effect the maf's lifespan.
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Old 03-14-2002, 09:39 PM   #5
Revision
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Old 03-14-2002, 10:37 PM   #6
ColinL
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huh, this is very interesting. if I switched to anything, a good first choice might be a 2.5L DOHC MAF from a '98 RS or '99 Legacy GT.

unless of course it really works with a wide array of stuff, then you might pick up a mustang or fbody unit for cheap...
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Old 03-15-2002, 05:49 AM   #7
HOK
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this is so strange i have never blown a MAF...30000 kms turboed..
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Old 03-17-2002, 11:44 AM   #8
wac
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Okay, I was finally able to locate several wiring diagrams (thanks in part to John Banks and Brian Batty) to get to the bottom of this, at least theoretically.

This is the pinout of a pre-MY99 MAF:
1. Ignition +12V
2. (No connection)
3. MAF ground
4. MAF signal
5. (No connection)

And this is the pinout of a MY99+ MAF:
1. (No connection?)
2. Ignition +12V
3. MAF ground
4. +5V from TPS
5. MAF signal
This pinout is consistent for 1.8L, 2.0L (turbo and non-turbo), and 2.5L engines. I don't have the exact wiring diagrams for the North American MY98 and MY99 models, but if someone with service manuals can show me the corresponding pages similar to this one, then we'll know for sure (MY97 2.2L page shown):
http://wac.addr.com/auto/obs/maf.pdf

In theory, one can use an MY97-98 MAF in an MY99 simply by splicing up the corresponding wires. The "+5V from TPS" connection can be left off since the MY97-98 MAF doesn't use it.

I don't know any MY99 owners in the New England area, so I cannot verify this theory. Hope this helps,

-WaC
Wayne
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Old 03-17-2002, 04:47 PM   #9
Rich L
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Custom Rallispec kit/IC#1

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Thanks Wayne for the info...

It really is an interesting theory which seems to make sense.
Unfortunately, wiring schematics and electronics are not my forte'
So I can only give my ignorant oppinion.

Any electronic guys care to comment on this??

I live in NJ, and am willing to use my car as a experiment to try to splice a 98 maf to my ride. Anyone up for the challange?

Its for a good cause.:monkey:
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Old 03-17-2002, 11:19 PM   #10
wac
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Champagne Gold Opal

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Quote:
I live in NJ, and am willing to use my car as a experiment to try to splice a 98 maf to my ride. Anyone up for the challange?
Options:
1. Drive up to NH and we can try my MAF on your car. It's 5-6 hours drive each way.
2. Persuade SteveS to let you try his MY98 MAF on your car, after he installs the TEC-II. I'm sure he'll thank me for suggesting this...

-WaC
Wayne
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Old 03-18-2002, 01:41 AM   #11
LVSUBARU
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I think it would be cheaper and easier to just convert to a MAP system. I've never heard anybody say their MAP went out!!!!
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Old 03-18-2002, 03:54 AM   #12
subachad
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I forget who it is, but it's my MAF that he's using. I got one with my new motor and since My old one is still fine after 171,000 miles I didn't really need two. You can get a 93 MAF (if it works with the greddy thing) for about $75 or so from a wrecking yard.

Hopefully, by the end of summer, I won't need it since I'll be using a 3 bar MAP and Haltech.

Chad
93 1.8T
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Old 03-18-2002, 05:57 PM   #13
wac
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Quote:
I think it would be cheaper and easier to just convert to a MAP system.
Not with used ECU's costing over $500, and programmable engine management systems (Link, Haltech, Wolf3D, etc.) costing over $900 (not including MAP sensor). Do you know of a MAF-to-MAP conversion kit for less than a $300 MAF plus a few wire spices?
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Old 03-18-2002, 10:04 PM   #14
LVSUBARU
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I know they mke stand alone MAF to MAP systems. Stillen makes one. They have to be cheaper than $300!!!
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Old 03-19-2002, 08:19 AM   #15
wac
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Champagne Gold Opal

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Quote:
I know they mke stand alone MAF to MAP systems. Stillen makes one. They have to be cheaper than $300!!!
Please share the wisdom. The only one I know of is the HKS VPC, which is over $1000.
http://www.hksusa.com/products/?id=858

-WaC
Wayne
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Old 03-19-2002, 09:42 PM   #16
LVSUBARU
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Stillen sent me a catologe awhile ago. I saw a set up in there. I gave the catologe to a friend and never got it back. I've seen them elsewhre also. I'll look around and get back to you guys!
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Old 03-20-2002, 03:15 PM   #17
Rich L
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Custom Rallispec kit/IC#1

Thumbs down

maf to map conversion?

I wasnt sure if that could be done while retaining the stock ecu.

There has to be a simpler solution.

Cobb Tuning emailed me saying they quit searching for a solution because maf companies aren't interested in the project because there arent enough RS's to justify the R & D.

How much could it possibly cost to develope a better maf?!

I would think it would be relatively cheap.

This world is so cruel.
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