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Old 04-23-2002, 05:08 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

Lightbulb Big News! Finally a cheaper and awesome solution for MY99 RS-T MAF problems!

Well... believe it or not there is finally a new option for those RS guys that keep blowing MAFs (I popped 4). As I write (still in awe of this accomplishment, and Rallispec's professional installation) its hard to believe that I now have a transplanted Ford SVO Cobra MAF operating under my hood!

Whats the secret? A Split Second fuel controller, a big tough high flowing Mustang MAF and a bit of Rallispec wiring magic.

It actually works great! My car has never felt so strong.

More to come over time. My car still needs some more tuning and repair. But so far.... this reviewer gives the mod rating a 10 out of 10.

Go Rallispec! Yeah!

Oh yeah... and a thanks to Billy (SUVTWO) for the parts and idea.
We must all drive up to the Bronx and buy donuts from his restaurant! Billy u da mang!
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Last edited by Rich L; 04-23-2002 at 05:22 PM.
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Old 04-23-2002, 06:22 PM   #2
mastervic27
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Thumbs up

I've been hearing the MAF failures for years now and finally I'm getting a turbo installed in my car. It would be interesting to see if I come across the same problem. If I do I'll have to refer to Rallispec. Those guys are great! Thanks!
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Old 04-23-2002, 06:41 PM   #3
ColinL
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uh... cheaper? only if we can duplicate what rallispec did or they sell it as a kit for a reasonable sum.

don't get me wrong, I'm quite excited about this! what's the split second fuel controller cost? how about the mustang MAF?
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Old 04-23-2002, 09:45 PM   #4
Rich L
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Labor was like 3hrs or less.

The fuel controller has a nice feature that it operates off of load, not rpm.

heres the link:
http://www.splitsec.com/products/arc2/arc2ds.htm

At $500 I know its a bit pricey, but it is a significant developement! The install isnt very complcated and the maf pretty much bolts right up to the controller. I will be upgrading to bigger injectors shortly... so lets see what happens.

Im not sure of the maf price but hell... it is a one time fee, and after 4 $300 stock mafs.... its worth it. Its way bigger and flows alot of air. It bolted right up.

Im not saying it is more refined than stand alone aftermarket ECUs, but it offers good bang for the buck!

Free at last! Free at last!
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Old 04-23-2002, 10:03 PM   #5
Accurit
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Ford who would ve have known it could help Subaru's haha


Rich instead of racing for pink slips go for their MAFs


haha
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Old 04-23-2002, 11:59 PM   #6
RalliSpec
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It was an interesting approach to solving the problem. It was something that Rich brought to us and not the other way around. We just made it work.

It has a lot of potential because the adjustability allows for all types of changes to the car including larger injectors. Unfortunately the unit doesn't have quite enough adjustability for me to be completely satisfied. The dials have like 9 or 10 detents across the full range (with one dial for low, mid, and high portions of the MAF output curve). Each detent represents a rather coarse change to the MAF voltage so its really hard to dial in exactly.

Another possible solution lies with a product from Link called the AFMLink. It basically converts the mass air system to a speed density system by replacing the MAF with a MAP sensor and allowing adjustability of the voltage output for optimisation. Its programmable via the same hand control unit the plug-in Link ECU's can be controlled by. As far as I can tell its fully mappable via an RPM vs. MAP lookup table. We have yet to get one of these in to the shop but I am really interested in trying it out. Might be a slightly less expensive option since the MAP sensors are a lot cheaper then a MAF, even from Ford. For some reason I can't find the pricing on it now, but if memory serves me right it was on the same level as the Split Second unit.

--Dave
RalliSpec
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Old 04-24-2002, 12:20 AM   #7
froggert
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wow, rich l with a mustang part under his hood. never thought i'd see the day.

glad to hear your car is up and running.

roger
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Old 04-24-2002, 12:25 PM   #8
RallyNavvie
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What about the Greddy EManage or whatever that thing is that allows you to swap MAFs from several different types of cars? That was about $300 if I remember and you could use an older Subaru MAF with it.

I mean if you're going to pay $500 for one more component why not just NOT buy those components and get a new ECU. My system un-MAFed my car and it was the best thing I ever did. Keep in mind a Haltech is only $1300 and I was able to do it without the aid of a performance shop, just a knowledgeable Subaru mechanic who did it in his free time.

RalliSpec: you guys should be testing that Greddy computer instead. It seems like an easier and cheaper method rather that what you have laid out. I believe the eManage also manages fuel and timing based on load. The one person I know of that's playing with it says a lot of it.

~Garrett
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Old 04-24-2002, 12:30 PM   #9
HndaTch627
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FWIW alot of tuners use the Cobra MAF sensors....i know for a fact that Jim Wolf does when working the ECU beyond the stock MAF.

jeremy
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Old 04-24-2002, 01:23 PM   #10
RageHardIntoTheBendies
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I'm very interested in the EManage IF the tuning software is going to madfe avalible to the public.

According to Split second the ARC1 will also allow you to convert to a new MAF, it is far cheaper but also even less tunable.

If we have the wiring figured out could you not just use a couple of Pot's to trim the MAF voltage?
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Old 04-24-2002, 01:26 PM   #11
8Complex

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Quote:
Originally posted by RageHardIntoTheBendies
If we have the wiring figured out could you not just use a couple of Pot's to trim the MAF voltage?
Yeah... I'm 95% sure that airflow metering devices of the same type are linear outputs, so a pot. would work just fine. That is what I was planning on testing out to see if I could get my 440's working in my car NA before going full management (which would be pre-turbo still... leave myself time to tune).
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Old 04-24-2002, 01:33 PM   #12
RageHardIntoTheBendies
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Cool I have been pondering this for some time, I was going to make somthing similar to this
http://www.autospeed.com/image.html?...0008_12&REZ=mg
But as my car is my ONLY daily driver I'm scared to be the first

Sombody tested several Subaru MAF's and found the outputs to be allmost identical
EDIT here is the link http://wac.addr.com/auto/obs/safc/safc.html
/Edit
, so to make the HotWire maf from a 98 work should be very simple.

Last edited by RageHardIntoTheBendies; 04-24-2002 at 01:41 PM.
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Old 04-24-2002, 01:51 PM   #13
8Complex

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Correct me if I'm wrong, but with a pot. don't you just need signal in, signal out, and ground? After all, the signal is always positive, even at rest/idle.
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Old 04-24-2002, 01:52 PM   #14
STiTuner
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MAF swap are actually common place amoungst other cars. for example...

Nissan 240sx's will often switch MAFs with a Maximas because they are bigger and flow better.

Brad
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Old 04-24-2002, 01:57 PM   #15
RageHardIntoTheBendies
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8Complex: yes your right, the circuit I posted uses 2, the 1st one is for corse adjustment and the 2nd for fine tuning.
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Old 04-24-2002, 02:33 PM   #16
8Complex

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RHITB: Ahhhh ok... probably a good call, actually. I might have to borrow that circuit diagram and utilize it.
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Old 04-24-2002, 02:36 PM   #17
RageHardIntoTheBendies
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Here is the whole article that I pirated the Diagram from, you may find it usefull.
http://www.autospeed.com/A_0008/P_1/article.html

Let me know how you make out.
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Old 04-24-2002, 02:43 PM   #18
8Complex

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RHITB - Dude... that is so perfect to what I'm looking to do! Thanks.
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Old 04-24-2002, 03:36 PM   #19
Rich L
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wow... 2 years ago everyone was scratching their heads about maf swapping/upgrading issue. At least now there are some options.

Im just so happy it worked out. Like HndaTch627 said... the fact that the Ford maf is so tough (and huge) is a big deal for me.
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Old 04-24-2002, 04:02 PM   #20
RageHardIntoTheBendies
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Rich: most of the knowlage is just theoretical, yours is only the 2nd car I know of running a different MAF.
Do you know the PN for the Mustang MAF? mustang parts are much easyer to come by than scooby ones up here.
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Old 04-24-2002, 05:41 PM   #21
Kevin Thomas
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Default Great News!

Quote:
Originally posted by Rich L
wow... 2 years ago everyone was scratching their heads about maf swapping/upgrading issue. At least now there are some options.

Im just so happy it worked out. Like HndaTch627 said... the fact that the Ford maf is so tough (and huge) is a big deal for me.
Congrats RichL! I'm glad to hear/read that everything is going ok for you. I remember you telling me about your Maf problems in the past.


Will you be enlarging your throttle body and getting a larger diameter intake to match the diameter of the Ford MAF? I'm assuming the diameter is larger in the Ford MAF sensor. If you said the MAF diameter size already, I must've overlooked it. I'm at work right now and in a hurry. Good News though! Congrats again.
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Old 04-24-2002, 06:02 PM   #22
XT6Wagon
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Rallispec, have you looked into making a cheap "translation" box, as I have heard these can be made for $30 or so?

For the others, Fod makes a huge variety of MAFs, including the 90mm on the latest Lightning SVT's.

The only two I know the dimentions for is the 55mm SHO MAF, and the 70mm Cobra MAF. These use a 3" machined surface you hose clamp a rubber 3" hose to. They use a 3.5" surface on the filter side, and there is a good many K&N filters that you can get for this.

The 80mm MAF's that I've seen from Ford seem to use a larger than 3" connector (no idea on real size), and a 4 bolt flange on the filter size. MAF adaptors are cheap and common.

Try doing a search on the aftermarket MAF's for the Mustangs. I've seen that some come with a translation box std, so you can use the MAF as a "AFC" and correct for modifications as you do them. No idea if they have enough range to translate to the signal the Subaru's need.
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Old 04-24-2002, 08:06 PM   #23
Rich L
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Thumbs up

Rage... the part number directly on the maf is as follows:
F6SF-12B579-AAAFH70-02C1006

Dont forget my MAF setup came with an adaptor that bolted the Ford MAF directly to the Split second computer. The harder part is splicing the wires from the fuel controller to the ECU. (Rallispec correct me if I am wrong on this).

I believe it is the same 70mm Cobra maf that XT6Wagon mentioned. It attaches to a 3.5" K&N cone filter that Rallispec slapped on. (very nicely I might add)

Kev T: the TB enlargment is down the road .... for now... bigger injectors and more boost is what Im looking for.

FWIW: my car feels stronger than ever!
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Old 04-24-2002, 10:58 PM   #24
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Rich - how long ago was it that we spoke and we discussed this as beign an option...gla it worked out for you

Dave - ditch the AFMLink...having used it personally, I can say its one of those products that looks better on paper than it perform,s in execution.....

adam
Z-1 Performance
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Old 04-25-2002, 12:39 AM   #25
TMR Impreza
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I was running this setup over 2 years ago, but no one ever listens to me.

www.tmrmzine.com
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