GT-40 install help

budbudford · 05-30-2006, 09:44 PM

I recently picked up a GT-40 upper and lower manifold second hand, but I am puzzled. All that I have is the upper and lower intake plus a vacuum tree.

When I am looking at the underside of the upper intake, there are 4 threaded holes, two on the middle underside of the tubular section. It's obivious that the vacuum tree goes there on one side, but what goes on the other? Do I plus the other one?

On the upper section, one of the holes has a threaded plug in place, and the other is open. Do I plug the open one too?

Does anyone have any install experience with this intake? Any help is appreciated.

Dark_5.0 · 06-01-2006, 10:11 AM

Very simple there isnt exactly set rules on how to route your vacuum lines. Just plug the holes you dont use.

~The Jester~ · 06-02-2006, 06:42 AM

Doesn't the MAP sensor go in one of those?

Dark_5.0 · 06-02-2006, 09:11 AM

I posted a how to article with pics a couple of years ago here in windsor power.

Do a search and you might find it.

~The Jester~ · 06-02-2006, 02:12 PM

No, seriously! I'm a "carb" guy, and trying to learn about this new fangled (20 years now! LOL) fuel injection. Is the MAP sensor supposed to go in there, or is that a Speed Density thing?

Just curious!!

Coupe50h · 06-02-2006, 10:23 PM

I only know of the act sensor in the lower, your swap should be pretty straight forward.

Hethj7 · 06-05-2006, 11:56 AM

It's been years now since I installed my GT-40 intake, and although I can't remember all the details, I do remember plugging one of the ports there.

HoodStrype · 06-13-2006, 10:42 AM

You can tap the upper to put the AIT sensor there but it's easier to just use the air inlet tube. As for the vacuum lines, just like was said before. Reroute them anyway you please but you may end up having to install an Adjustable FPR and a Fuel Pressure guage. If you get more or less vacuum than stock to the FPR it will up or lower your pressure... take it from experience just go ahead and do it- good luck~

Hozer 88GTConv · 06-15-2006, 08:17 PM

The big vacuum port on the rear goes to the brake booster
one goes to the pcv (i also use a small filter b/c it will suck oil) and one goes to my AFPR. One is plugged.
If you have a BAP sensor (I don't know what year you have) leave it open to the atmosphere.
Let me know if you need a pic...
cheers

05-30-2006, 09:44 PM	#1
budbudford Registered Member Join Date: May 2005 Posts: 16	GT-40 install help I recently picked up a GT-40 upper and lower manifold second hand, but I am puzzled. All that I have is the upper and lower intake plus a vacuum tree. When I am looking at the underside of the upper intake, there are 4 threaded holes, two on the middle underside of the tubular section. It's obivious that the vacuum tree goes there on one side, but what goes on the other? Do I plus the other one? On the upper section, one of the holes has a threaded plug in place, and the other is open. Do I plug the open one too? Does anyone have any install experience with this intake? Any help is appreciated.

06-01-2006, 10:11 AM	#2
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: GT-40 install help Very simple there isnt exactly set rules on how to route your vacuum lines. Just plug the holes you dont use. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

06-02-2006, 06:42 AM	#3
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	Re: GT-40 install help Doesn't the MAP sensor go in one of those? __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....

06-02-2006, 09:11 AM	#4
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: GT-40 install help I posted a how to article with pics a couple of years ago here in windsor power. Do a search and you might find it. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

06-02-2006, 02:12 PM	#5
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	Re: GT-40 install help No, seriously! I'm a "carb" guy, and trying to learn about this new fangled (20 years now! LOL) fuel injection. Is the MAP sensor supposed to go in there, or is that a Speed Density thing? Just curious!! __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....

06-02-2006, 10:23 PM	#6
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	Re: GT-40 install help I only know of the act sensor in the lower, your swap should be pretty straight forward. __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

06-05-2006, 11:56 AM	#7
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	Re: GT-40 install help It's been years now since I installed my GT-40 intake, and although I can't remember all the details, I do remember plugging one of the ports there. __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

06-13-2006, 10:42 AM	#8
HoodStrype Rearview Mirror Haze Join Date: May 1999 Location: Huntsville, Alabama...a.k.a. "HuntsVegas" Posts: 387	Re: GT-40 install help You can tap the upper to put the AIT sensor there but it's easier to just use the air inlet tube. As for the vacuum lines, just like was said before. Reroute them anyway you please but you may end up having to install an Adjustable FPR and a Fuel Pressure guage. If you get more or less vacuum than stock to the FPR it will up or lower your pressure... take it from experience just go ahead and do it- good luck~ __________________ 93 lx Notch 01 GT ...the epitome of Murphy's Law

06-15-2006, 08:17 PM	#9
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: GT-40 install help The big vacuum port on the rear goes to the brake booster one goes to the pcv (i also use a small filter b/c it will suck oil) and one goes to my AFPR. One is plugged. If you have a BAP sensor (I don't know what year you have) leave it open to the atmosphere. Let me know if you need a pic... cheers __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

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