MAF Conversion

ffemt1121 · Jul 8, 2009

I dont have MAF on my 88 gt. Its just a straight air inlet pipe into the t/b. Any ideas ?

TenorPlayinGuy · Jul 8, 2009

If you want to do a Mass-Air conversion, Then I highly recommend getting a kit from Interactive Systems & Technologies Mass Air Home Page

Halfway down the page. Its a harness for the meter, as well as the 3-4 wires you need for splicing into your fuel pump relay, and Vss signals. You'll also need a MAF computer from any 89-93 Fox mustang. A9L is the fav, but there are many others.

Also if you don't have Cruise Control in your mustang, you'll need to upgrade that as well.

Your post is not specific, from what you say, yeah you don't have a MAF Car.

ffemt1121 · Jul 8, 2009

Will it make a difference ?

If i dont have MAF will it make a difference in power when I put everything together. I have a TFS stage 1 cam, gt 40 heads and a holley u/l intake setup with 24lb injectors.

TenorPlayinGuy · Jul 8, 2009

Yeah, the stock Speed Density computer might not have enough tolerance in it, for even that much of a different setup.

Especially the larger injectors.

It's always a good thing to do, if your going to modify the car in any way.

ffemt1121 · Jul 8, 2009

then where should i go from here

Mustang5L5 · Jul 9, 2009

ffemt1121 said:
If i dont have MAF will it make a difference in power when I put everything together. I have a TFS stage 1 cam, gt 40 heads and a holley u/l intake setup with 24lb injectors.

Yes, you should have converted to MAF before putting these mods in...esp the injectors and cam.

You'll need to swap to MAF and then adjust for the 24# injectors either with a calibrated MAF or a chip/tune

rbonella · Jul 9, 2009

from here you go to Interactive Systems & Technologies Mass Air Home Page like TPG said and order a mass air conversion. FMS used to sell a nice one, but I think that is long gone. I had an 88 lx coupe highway patrol car that was speed density back in the early 90's, I think I modified a speed density car about as far as possible, maybe even too much. I ran a 65tb, tubular gt40 upper/lower (which made no difference with that computer) and a e303 cam. It idled like crap, loaded up constantly, bucked, stalled. Best it would run was a 13.5 @ 102 with 4:10 gears. I'm surprised your car knows what to do with those 24lb injectors and heads. After I converted the 88lx to mass air, it wasn't much faster, but it ran much smoother

JohnnyGMachine · Jul 9, 2009

I just completed the MAF Conversion on my 1988 Mustang GT a couple months ago. While doing the conversion I also upgraded to a 70mm Throttle Body from Accufab, 73mm C&L MAF meter, and 24lb. injectors since I'm doing heads intake and cam very soon. I used the MAF Conversion kit from Page 1

Here's the kit I bought including the TPS Calibration tool for $20.

The base kit sells for $375 and includes everything you need including the computer you will need (specify auto or manual). Here's the kit....

70mm MAF (19lb) $375.00
(1) OEM A9L (manual) or A9P (automatic) Engine Control Computer.
(1) OEM 70mm MAF Housing (19lb)
(1) OEM MAF Sensor
(1) NEW Wiring Harness
(1) NEW Short-Ram Air Intake

I not only installed the kit but I also documented the install with a complete intuitive write up with full photo documentation step by step for an upcoming tech article.

Any questions let me know if I can help.

John
midniteoctane@gmail.com

stykthyn · Jul 9, 2009

thats actually a pretty good price since it comes with a computer, I wish I had known that was around before scrounging up all my parts...

ffemt1121 · Jul 9, 2009

Well

thansk for all yalls help but i asked the guy that had the car before me and said that had a performance chip in it when he bought it so he didnt go to maf conversion

jrichker · Jul 9, 2009

With speed density and a custom chip, you may have to have the chip reloaded if you add additional parts to increase performance.

Most Mass Air engines accommodate additional high performance parts without any additional tuning or custom chip. The main exception to this is when you increase the injector size. That requires an aftermarket MAF calibrated for the injectors or a custom dyno tune and chip.

ffemt1121 · Jul 9, 2009

well then

if Its gonan be cheaper to just have it tuned then il ldo that rather than mess with a maf conversion setup and all. I appreciate all of yalls help.

lincoln+ford · Jul 9, 2009

what happens if you use a 5spd ecu on a auto mass air ofcourse.

f8tlfiveo · Jul 10, 2009

I know it works using a a9p in a 5 Spd car. I just did my mass air conversion last weekend. Make sure you do the vss sensor and the fuel relay. I used the writeup from Stangnet and followed the instructions..took about 3 hours..make sure you solder all connections..butt connectors are unreliable and will most likely cause problems down the road

lincoln+ford · Jul 10, 2009

jeepguy00 said:
I know it works using a a9p in a 5 Spd car. I just did my mass air conversion last weekend. Make sure you do the vss sensor and the fuel relay. I used the writeup from Stangnet and followed the instructions..took about 3 hours..make sure you solder all connections..butt connectors are unreliable and will most likely cause problems down the road

just cuz im lazy but whats the link?and i got a question for you guys does this look the same as a stang this is the write up for a mark VII.
http://www.lincolnsonline.com/tech/00077.html

since im throwing the TFS1 cam in my car im not sure if the wirring is the same and i suck.Luckly its not my daily driver.But yeah any help thanks srry didnt mean to hi jack but hey its about mass air stuff lol.

2FAS4U · Jul 16, 2009

I did my mass-air conversion a while back, but didn't install the VSS. I bought a VSS and speedo cable from IST, but it didn't come with any wiring for the VSS.

My car doesn't have cruise control. My understanding is that Pin 3 and 6 carry the VSS signal. Would my 60-pin connector have the wiring for Pin 3 & 6 or do I totally need to add the wiring from the VSS to the 60-pin connector?

Mustang5L5 · Jul 16, 2009

2FAS4U said:
I did my mass-air conversion a while back, but didn't install the VSS. I bought a VSS and speedo cable from IST, but it didn't come with any wiring for the VSS.

My car doesn't have cruise control. My understanding is that Pin 3 and 6 carry the VSS signal. Would my 60-pin connector have the wiring for Pin 3 & 6 or do I totally need to add the wiring from the VSS to the 60-pin connector?

The wiring should be present under the car. I was in the same boat. '88 SD, no cruise control. I bought the VSS and speedo cable and installed it. The VSS wiring harness was clipped to the crossmember. I unclipped it, removed the end cap and it plugged nto the factory harness.

When you install the IST harness, you tap into the factory VSS harness wires.

2FAS4U · Jul 16, 2009

Are you referring to the tranny crossmember? My car definently doesn't have any wiring underneath connected to the crossmember that is capped and available for us. This must be something that was done with newer SD cars.

jrichker · Jul 16, 2009

The SD cars with cruse control had a Vechicle Speed Sensor (VSS).

The SD cars without cruse control did not have a VSS,

All Mass Air cars have a VSS.

James_G · Jul 17, 2009

I'd do the mass air conversion. My car came with the stuff to do it from the previous owner include the ford motorsports computer adapter which is really hard to find. The throttle response is 10x better. It doesnt even feel like the same car. Some people say you'll loose power, but even using the stock 55mm meter cars seems to run so much better than it did. Gonna try to souce a 70mm from a junkyard hear soon.

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