MAC 70mm throttle body.

qhkajlog · 05-01-2002, 10:06 PM

I am new to this site, enjoyed it so far. I installed a 70mm throttle body on a 1990 GT. Runs fine, took it for a test drive and it seems to take longer to idle down. Are there any adjustments I need to make, did not see anything in my manuals. Any help would be appreciated. Thanks.

cyberstang5.0 · 05-02-2002, 07:59 AM

You might want to check out your TPS (throttle posistion sensor). That tells the computer how far open your butterfly is open/closed. Did it come with a new one? If it did, try putting the stock one on the new TB.

84LX89GT · 05-02-2002, 07:16 PM

I have an edelbrock/BBK 70mm throttle body (two names on one throttle body....go figure!), anyways, until i come to a complete stop it has always idled at 1100-1200 and then drops down to 800 as soon as i stop moving. I also adjusted my TP sensor. It idles at 800 only when i'm sitting still, and i've heard of a lot of other people with the same thing going on....just something to think about.

cyberstang5.0 · 05-02-2002, 07:28 PM

Quote:

Originally posted by 84LX89GT
I have an edelbrock/BBK 70mm throttle body (two names on one throttle body....go figure!), anyways, until i come to a complete stop it has always idled at 1100-1200 and then drops down to 800 as soon as i stop moving. I also adjusted my TP sensor. It idles at 800 only when i'm sitting still, and i've heard of a lot of other people with the same thing going on....just something to think about.

Yeah, that's what I have and it does the same thing

qhkajlog · 05-02-2002, 08:08 PM

So you guys have had no problems. I adjusted the sensor (what adjustment there is) and it idles a little lower so I guess it will be fine. Thanks for the info, anything helps. I am just getting started fixing up my Mustang. It has been easy stuff so far. Maybe this weekend I will install some mac equal length headers I picked up. From what I have heard they can be tricky. Thanks again.

cyberstang5.0 · 05-02-2002, 09:10 PM

We mod our cars so we can go faster and make the rush better, but you might want to keep this in mind... ANYTHING, and I mean ANYTHING you do to your car WILL make it run "different" then it was before. You might like the way the new setup runs or not, the trick is how to "retune" your car after you add or remove a mod.

A little advice about your equ shorties... you might have to raise your motor a little bit to cram them in. Make sure you put a large block of wood between the jack and the block.

If you need help, we are here to help

05-01-2002, 10:06 PM	#1
qhkajlog Registered Member Join Date: May 2002 Location: San Diego Posts: 10	MAC 70mm throttle body. I am new to this site, enjoyed it so far. I installed a 70mm throttle body on a 1990 GT. Runs fine, took it for a test drive and it seems to take longer to idle down. Are there any adjustments I need to make, did not see anything in my manuals. Any help would be appreciated. Thanks.

05-02-2002, 07:16 PM	#3
84LX89GT Mustangs Join Date: Jul 2000 Posts: 1,938	I have an edelbrock/BBK 70mm throttle body (two names on one throttle body....go figure!), anyways, until i come to a complete stop it has always idled at 1100-1200 and then drops down to 800 as soon as i stop moving. I also adjusted my TP sensor. It idles at 800 only when i'm sitting still, and i've heard of a lot of other people with the same thing going on....just something to think about. __________________ 2005 Suzuki Hayabusa GSX1300-R 1980 Ford Thunderbird - 255 V8 ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain hi-po Mack Truck hood emblem 1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc. Sold 02/06/04 1989 Mustang GT ET: 13.304@102.29 mph (5-24-03) Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
70mm Throttle body	StangGT02	Modular Madness	6	07-11-2002 09:24 AM
70mm throttle body big enough for my supercharged GT?	Skid	Modular Madness	4	05-08-2002 02:19 PM
99-01 Gt Throttle Body 70mm Stock?	steedamustang01	Modular Madness	5	04-17-2002 11:54 PM
who makes the best 70mm throttle body	Mustangboy89	Windsor Power	12	02-16-2001 07:02 AM
70mm Throttle Body	Dino	Modular Madness	1	09-30-2000 08:57 AM

05-02-2002, 07:59 AM	#2
cyberstang5.0 347ci of HORSE POWER!!! Join Date: Jul 2001 Location: Houston, TX Posts: 1,416	You might want to check out your TPS (throttle posistion sensor). That tells the computer how far open your butterfly is open/closed. Did it come with a new one? If it did, try putting the stock one on the new TB.

05-02-2002, 08:08 PM	#5
qhkajlog Registered Member Join Date: May 2002 Location: San Diego Posts: 10	So you guys have had no problems. I adjusted the sensor (what adjustment there is) and it idles a little lower so I guess it will be fine. Thanks for the info, anything helps. I am just getting started fixing up my Mustang. It has been easy stuff so far. Maybe this weekend I will install some mac equal length headers I picked up. From what I have heard they can be tricky. Thanks again.

05-02-2002, 09:10 PM	#6
cyberstang5.0 347ci of HORSE POWER!!! Join Date: Jul 2001 Location: Houston, TX Posts: 1,416	We mod our cars so we can go faster and make the rush better, but you might want to keep this in mind... ANYTHING, and I mean ANYTHING you do to your car WILL make it run "different" then it was before. You might like the way the new setup runs or not, the trick is how to "retune" your car after you add or remove a mod. A little advice about your equ shorties... you might have to raise your motor a little bit to cram them in. Make sure you put a large block of wood between the jack and the block. If you need help, we are here to help