mas air to speed density?

Florida Stang · 05-28-2002, 01:45 PM

Just wondering what all is to be done to go from maf to speed density and make it work? What all parts would have to be switched? Just trying to learn more about all the EFI systems.

gtsr515 · 05-28-2002, 02:22 PM

You know thats a good question.....but a bad idea in my opinion, I believe all you would have to do is remove the mass air sensor, and install the SD computer, you would need the SD inlet tube also.

With your package as listed, if you went backward and changed to SD, you would have driveability problems without a custom chip, PMS, or the like.

No flames, but why do you want to go to SD?

fiveohpatrol · 05-28-2002, 02:34 PM

it wouldnt be worth the money for the small amount of gain, if any

but if you insist on swapping over, I still have my SD computer if you wanna buy it

Unit 5302 · 05-28-2002, 06:01 PM

The harness would obviously change a little, the computer, getting rid of the MAF sensor, inlet tube. I don't know about the sensors.

Personally, I'm a speed density fan, but I wouldn't advise a retro-grade.

gtsr515 · 05-28-2002, 06:43 PM

Yes the harness would change too, forgot that, also MAF cars use a VSS (Vehicle Speed Sensor) located on the trans end of the speedo cable. (This sensor tells the puter the car is moving), I don't know if you would have to remove it or what, I think SD cars of 88 got it but 87 didn't, not sure.

Florida Stang · 05-28-2002, 10:25 PM

I'm not switching over to SD I'm just learning more about the setup . A buddy bought a "89 stang V-8 and the MAF setup was all gone even the computer . He was asking me about it and if it would work . Thanks for the input.

Mach 1 · 05-28-2002, 11:12 PM

speed density uses a MAP sensor, and MAF uses a BAP sensor. Similar, one goes in the manifold(speed density), the other measure atmosheric pressure(MAF).

Florida Stang · 05-29-2002, 11:56 AM

Where is the map sensor on the manifold of the SD cars? I have no idea.

Mach 1 · 05-29-2002, 12:56 PM

The senser is on the firewall in both cases. On speed density cars, the sensor has a vacuum hose going to the upper intake manifold (usually to the bottom of the upper, close to the vacuum tree on the factory manifold) and a connector with a couple wires going to it. MAP = manifold absolute pressure

The Mass Air cars can use the same sensor, except the vacuum hose is removed and the vacuum port plugged on the manifold, and the vacuum port on the sensor where the vacuum hose used to go, now goes to outside air and the sensor just reads ambient or atmospheric pressure. BAP = barometric air pressure

05-28-2002, 01:45 PM	#1
Florida Stang Registered Member Join Date: Feb 2002 Location: Apalachicola, FL. Posts: 30	mas air to speed density? Just wondering what all is to be done to go from maf to speed density and make it work? What all parts would have to be switched? Just trying to learn more about all the EFI systems. __________________ 306cid,BBk headers,24# racing inj.,75mm bullet,E-303 cam,keith black 10.5-1 pistons,holly ajust. fuel reg.,msd 6AL,msd billet distributor, trick flow intake with bbk 65mm Tb & EGR, world class HD trans. 4.10 gears and dynomax race mags.

05-28-2002, 02:22 PM	#2
gtsr515 Registered Member Join Date: Nov 2001 Location: Sunny, Hot, Sebring, Florida Posts: 725	You know thats a good question.....but a bad idea in my opinion, I believe all you would have to do is remove the mass air sensor, and install the SD computer, you would need the SD inlet tube also. With your package as listed, if you went backward and changed to SD, you would have driveability problems without a custom chip, PMS, or the like. No flames, but why do you want to go to SD? __________________ Remember...2nd place is 1st place for losers!

05-28-2002, 02:34 PM	#3
fiveohpatrol I'd rather be basketweaving Join Date: Feb 2000 Location: Indianapolis Posts: 2,551	it wouldnt be worth the money for the small amount of gain, if any but if you insist on swapping over, I still have my SD computer if you wanna buy it __________________ NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft

05-28-2002, 06:43 PM	#5
gtsr515 Registered Member Join Date: Nov 2001 Location: Sunny, Hot, Sebring, Florida Posts: 725	Yes the harness would change too, forgot that, also MAF cars use a VSS (Vehicle Speed Sensor) located on the trans end of the speedo cable. (This sensor tells the puter the car is moving), I don't know if you would have to remove it or what, I think SD cars of 88 got it but 87 didn't, not sure. __________________ Remember...2nd place is 1st place for losers!

05-28-2002, 10:25 PM	#6
Florida Stang Registered Member Join Date: Feb 2002 Location: Apalachicola, FL. Posts: 30	I'm not switching over to SD I'm just learning more about the setup . A buddy bought a "89 stang V-8 and the MAF setup was all gone even the computer . He was asking me about it and if it would work . Thanks for the input. __________________ 306cid,BBk headers,24# racing inj.,75mm bullet,E-303 cam,keith black 10.5-1 pistons,holly ajust. fuel reg.,msd 6AL,msd billet distributor, trick flow intake with bbk 65mm Tb & EGR, world class HD trans. 4.10 gears and dynomax race mags.

05-28-2002, 06:01 PM	#4
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	The harness would obviously change a little, the computer, getting rid of the MAF sensor, inlet tube. I don't know about the sensors. Personally, I'm a speed density fan, but I wouldn't advise a retro-grade.

05-28-2002, 11:12 PM	#7
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	speed density uses a MAP sensor, and MAF uses a BAP sensor. Similar, one goes in the manifold(speed density), the other measure atmosheric pressure(MAF). __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

05-29-2002, 11:56 AM	#8
Florida Stang Registered Member Join Date: Feb 2002 Location: Apalachicola, FL. Posts: 30	Where is the map sensor on the manifold of the SD cars? I have no idea. __________________ 306cid,BBk headers,24# racing inj.,75mm bullet,E-303 cam,keith black 10.5-1 pistons,holly ajust. fuel reg.,msd 6AL,msd billet distributor, trick flow intake with bbk 65mm Tb & EGR, world class HD trans. 4.10 gears and dynomax race mags.

05-29-2002, 12:56 PM	#9
Mach 1 Registered Member Join Date: May 1999 Location: Georgia Posts: 3,866	The senser is on the firewall in both cases. On speed density cars, the sensor has a vacuum hose going to the upper intake manifold (usually to the bottom of the upper, close to the vacuum tree on the factory manifold) and a connector with a couple wires going to it. MAP = manifold absolute pressure The Mass Air cars can use the same sensor, except the vacuum hose is removed and the vacuum port plugged on the manifold, and the vacuum port on the sensor where the vacuum hose used to go, now goes to outside air and the sensor just reads ambient or atmospheric pressure. BAP = barometric air pressure __________________ 2002 GT 1993 GT (SOLD) '93 Mustang GT RHC member #142

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
First ticket. Sucks, sucks bad.	zepherman	Blue Oval Lounge	46	12-16-2001 07:24 PM
EFI conversion with Speed Density and a 351w?	PSI GUY	Windsor Power	2	12-02-2001 11:13 PM
12 second speed density	Yan88gt	Windsor Power	9	09-13-2001 09:13 PM
wan't to go faster with N/A speed density	Yan88gt	Windsor Power	4	06-13-2001 11:10 PM
speed density question..	bobtodd	Blue Oval Lounge	2	04-15-2001 02:03 AM