85 replies to this topic

[Boosted_One]

Here is the install for the 1G MAS. Chad did an excellent job at explaining it. Thanks Chad!

Make SURE you get a 1G TURBO MAS and not the NA MAS because you will be downgrading! Your target cars are 1990-1994 TURBO Eclipse, Talon and Laser.You will also need the connector off the wire loom from the donor 1G turbo DSM.

The non turbo DSM MAS connector will not work for the swap

Take your time, solder your wires, tape it up nice and all should work out well. Just make certain you follow these instructions and make sure your wiring is correct.


After this install on my 20G set-up this gave me more fuel, less restrictions and pushed the fuel cut to some ungodly number like 30 psi or something. I never hit any fuel cut on the 1G MAS with 23PSI.

ENJOY!  ;D

Mike K
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the wiring may be easier viewed this way:

>> Print this out if you want to do the mod <<

87/89 stock harness, looking at the wire side of the connector. " = " is the clip at the top of the connector.

=
1 2 3
4 5 6

1-G DSM:

=
7 1 2 3
x 4 5 6

match up 1 to 1, 2 to 2, 3 to 3, etc, leaving 7 unconnected, x is a slot with no wire in the DSM connector.

Here are the colors for those who get lost or need further assistance. It also helps verify you have the propper orientation when looking at the conenctor. the 87/89 connector:

1 - white/black
2 - large red
3 - green/red #1
4 - black/white #1
5 - black/white #2
6 - gren/red #2

the DSM connector:

1 - green/blue
2 - large red
3 - green/red
4 - green/black
5 - green/yellow
6 - green/orange
7 - green/white < un-used

In therory this will work on an 86 as well, I had an 88 on my 86 for a few weeks so I know they are compatable. I can post that color code as well, the colors are all different, and 1 wire needs to be added from a +12V switched source (IGN). If an 88 will work, so then will a 1-G DSM.

So how does it work? Awesome !! I noticed a substantial improvement in top end, and lost the stumble at about 3000-3500 I was having with the 88 MAS and my oversided injectors (flooding). I now run an oversized primary on an 88 ECU with this MAS. I hacked the bypass tube like Mike did and got a perfect mixture from idle to WOT at 6000 RPM. At the very least, this allows you to slightly raise the fuel pressure and not flood out in mid-throttle. Keep in mind my car has a butt load of mods, a less modded car probably won't notice as much difference. Stock cars may not want to hack the bypass tubes at first.

This is a viable solution to those with bad or flakey MAS's, these units are 1/3 the cost (~$40-$60) and 10 times more plentiful.

More hacking may even allow for running a secondary in the place of a primary, but then you get hard cold starts, I can eleborate on this in another post if any one is interested.

Chad

[DeeDub]

Will this mod pass smog? Thanks

[Boosted_One]

currently CARB E.O. number D-40-29 is pending certification on the 1G MAS swap.  :D


To be honest I don't know if it will pass emissions.

I haven't seen anyone posting failed smog test after the swap to flag a concern.

Mike K

[conquest89]

Is there any way to diagnois if you wire it wrong?  Also,  I took the cardboard out of my 1g (like I did on the stock) is going to cause problems?

[PiercedJD]

Is there any way to diagnois if you wire it wrong?  Also,  I took the cardboard out of my 1g (like I did on the stock) is going to cause problems?

took the cardboard out? that's where it actually reads the airflow. In order to modify the dsm mas, you can remove the lower honeycomb, and back out the set screw so they center opening is free and unobstructed, and if you are really crafty you can part of the lower/unmetered section off to allow more unmetered airflow.

removing the cardboard will make it read inacurately, and is highly recomended against. as well as removing the upper honeycomb. The upper honeycomb produces small vortices , these vortices are read later in the cardboard section, this is karman vortice metering. if you tamper with that you have effectively killed your mas.

on another note, why wouldn't a 2G mas work with the starion then, since the 1G dsm'ers use it as an upgrade. Flows about 20% more air than the 1G mas.

[Boosted_One]

on another note, why wouldn't a 2G mas work with the starion then, since the 1G dsm'ers use it as an upgrade. Flows about 20% more air than the 1G mas.

The 2G MAS flows a lot and ends up throwing our Starion ECU fuel maps way out of their tables. You could however use an Apexi SAFC and use the 2G MAS.

Although the SAFC could also be used with a really hacked up Starion MAS with good results.

The 2G MAS on a DSM can have the injectors swapped out for larger ones which compensates for the larger 2GMAS. Due to the restrictions with the FI on a Starion injector selections are extremeky limited compared to the FI used on the DSMs

The 1G MAS is a quite a leap compared to the stock MAS.A 1G MAS is cheap, available, simple install and runs well with the Starion ECU, almost like a factory upgrade part in a sense.

[PiercedJD]

on the dsm's you can sometimes get away with using 550 injectors in conjunction with the 2G mas, since they both flow about 20% more, but  Safc is generally required to dial it in, but if you already have a safc, it's a viable option for a mas replacement, since it will flow more air, send fuel cut to some crazy unreachable number hz wise, and has more options available for mounting location etc due to the way the filter attaches. You can make a nice cold air intake as long as you have the space to route the piping.  But then I was able to do this on my car with the 1G mas, sat it in front of the radiator. Just takes a little ingenuity.

[Fuze]

Mike this is a nice surprise. I often wondered but never took it to the next level. Now it looks like I'll be hitting the yards this weekend...

What do you mean by "hacking the bypass tube", r u talking about the rubber hose that connects to the intake boot from the filter can lid? Damn, I plugged that long ago, lol. (I've got a 3" PVC pipe there now ) If this is what you mean, a little baby K&N filter there would be a trick solution.

[Boosted_One]

Hacking the bypass tubes would be opening up the unmetered section of the MAS itself. You can remove the honeycomb on the bypass but do not remove the honeycomb from the metered section.

What I did was cut right down the center making the once 2 circles one large oval. I had that MAS dialed in and flowing a heck of a lot than the stock MAS.

It drops in really nicely. More importantely it functions much better to the heartbeat of the car IMHO.

[PiercedJD]

http://www.geocities.com/piercedjd/newradiatorpic.jpg

you can see the cold air intake I mentioned in the previous post in this picture

http://www.geocities.com/piercedjd/newengine.jpg

different angle on it.

[conquest89]

IF either or both the two black's and two green/reds, what would happen? Any idea what wire goes where?

[Ratmtattat]

Just a point of curiosity, has anybody sucessfully installed a 1G MAS (or any other MAS) on an '86?  I've tried disconnecting my MAS and well, I have one of the '86s that doesn't respond well to that, so I'm thinking the 1G MAS would be a good idea.

Jason

[REDRIDER]

Will a 1g help bring be a good chice for an 1987 bstck motor...if not,,,,,,,,,why and will this boost my horse power at all?

[Heron]

Hello guys; could someone that has the 1G AFS installed take a look at their part number and check if it's E 5 T 02071 ?
It seems that I finally found one but need to confirm.
Regards,
Heron

[ESIrType?]

Some of you guys were asking about swapping a 1g mas. I found something I had printed out from along time ago on doing the swap. I wish I could give credit to whoever published it, but I don't know who it was.
Keep in mind this is for a 87/89 ecu, but it should still work. The only diffrence that I can see is that the 87/89 mas and ecu have a barometric sensor on them. On the 87/89 mas connector the last two wires (#5 b/w & #6 g/r) are for that.

Someone please correct if I am wrong.
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[glow=blue,2,300]86 AFS/MAS                           1G AFS/MAS[/glow]

Green/Red------------------Green/Orange
Red-------------------------Green/Red
Black-----------------------Green/Black
White/Black----------------Green/Blue
New > A 16----------------Green/Yellow
New > +12v Switched-----Red
N/C-------------------------Green/White

Note

1."N/C" means "no connect"
2. A 16, A is the connect on the ecu (the lage 24 pin one) & 16 is the pin number on that connector.
3.Keep in mind that A 16 is only on a 87/89 ecu and this is for the barometric sensor I believe.
4.On a 86 you DO NOT connect the A 16 to 1g's Green/Yellow

Hope this helps....let me know if this works.
I have an 87esi-r so I haven't tried it.

[Heron]

:-/  I've just installed my 1G AFS. Iddling and driving is quite the same but when I gas it all the way to 6K RPM my fuel pressure has a sudden drop to 38 psi or even less. Before, with the stock AFS fuel pressure went all the way to 52 psi and kept there.
I was looking at the manual, electrical section, one of the gren and red wires goes to the tps and the other one to the computer. This 1G AFS has an extra wire that we are not using. Could it be to "exite" the fuel pump? With the swap I CAN'T hear my fuel pump anymore.
Does anyone have a friend that has the electrical scheme for the 1G AFS? I'm going to ask a local Mitsubishi mechanic that has a 90 talon turbo. He swaped his 1G AFS to the 2G and he seems to understand on electrical problems.
Regards,
Heron

[zactek]

For those of you who haven't put on the 1G MAS, there's a way to connect the stock wiring harness to the new MAS without cutting, soldering, taping, etc. I found that the pins that are inside the connectors are exactly the same. Using a flat screwdriver (the kind that's used for eyeglasses) or a thin nail, there's a way to push small plastic clips out of the way inside the connector and push the wires out of the stock connector. Then you can transplant them onto the 1G connector. Comes out much cleaner and faster. It's a little annoying at first but once you push one of the pins out, you'll get the hang of it.

[conquestpa]

This is a great upgrade...