Aftermarket TB's Suck! Beware

kkdoughboy · Aug 20, 2007

Just wanted to voice my opinion on these aftermarket TB's. First I purchased an MMR TB for around $400. Tried to install it and the car was f'ed. Check engine light, wrench indicator and wouldnt rev. Reinstalled the stock TB and all was fine. Sent the aftermarket TB back to MMR. They looked at it and said they adjusted it and it would definately work. Well what do you know- it didnt work. The same damn thing happened when I installed it. Called MMR again and they basically told me I'm stuck with the damn thing. What a great company that is. Then I decided to ditch the MMR TB and take a loss. I go out and buy a Granatelli TB for around $450. Well wouldnt you know this damn thing doesnt work either. I am an expert at installing these TB's now! I have installed then removed and so on and so on about 10 times now with no luck. To make a long story short dont waste your time buying these piece of s things. It's not worth the 2-6 hp you might get. Later fellas.

ranger04 · Aug 21, 2007

I'm telling you this new drive by wire is going to make TB swaps touch and go.

lightblade · Aug 21, 2007

I've had the bbk 62mm tb for about 500 miles now, with zero problems. And I personaly will never buy gms. 02 cents.

Radman · Aug 21, 2007

Lemme know when you put 'em on ebay!

Stang457 · Aug 23, 2007

I installed a bbk and it sucked. any time i drove it for more then 45min is would get stuck on. i ended up putting the stock one back in.

lightblade said:
I've had the bbk 62mm tb for about 500 miles now, with zero problems. And I personaly will never buy gms. 02 cents.

lightblade · Aug 23, 2007

Stang457 said:
I installed a bbk and it sucked. any time i drove it for more then 45min is would get stuck on. i ended up putting the stock one back in.

when i first installed it i pushed the throttle open with my finger and it got stuck or stayed open, i tooked it back a part and found that i clocked the spring wrong, pulled her off fixed the spring tested it by pushing it with my finger( should spring closed after you open it, and slapped it on there and havent had a problem with it yet.

RBonite · Aug 24, 2007

I've had the BBK TB for some time now and never had an issue. Power was not much (no dyno #s, just pedal feel) but I figure with future internal engine mods, it couldn't hurt to have it. Brenspeed got 7 rwhp with their modded S197. I'm glad I didn't spend the extra money for the GMS model.

Stang457 · Aug 24, 2007

Yea, the first time I had problems it was because it was not wound up enough. After that I fixed that problem and things kept happening. If it actually got 10hp I might mess with it more. 3 times on the side of the hwy in my suit winding a spring was enough for me.

lightblade said:
when i first installed it i pushed the throttle open with my finger and it got stuck or stayed open, i tooked it back a part and found that i clocked the spring wrong, pulled her off fixed the spring tested it by pushing it with my finger( should spring closed after you open it, and slapped it on there and havent had a problem with it yet.

Fourth Horseman · Aug 24, 2007

I haven't changed out my Mustang's throttle body, but I know that when I put the dual 60mm Accufab throttle body on my Marauder that I had to adjust the throttle position sensor and use a volt meter to get the idle voltage just right. It wasn't hard to do, but was necessary so that the computer didn't freak out. Perhaps that's something that needs to be done on our Mustangs' TBs as well? Typically you can just loosen the two TPS screws and rotate the sensor ever so slightly one way or the other for adjustment.

MikeysOTP · Aug 24, 2007

I have a Dodge Dakota with the 4.7 in it and it is also drive by wire. The first thing I did to it when I got it was to follow a procedure posted on a message board like this one to adjust the TPS sensor to .07 volts. It made a huge difference in throttle response, apparently the factory does not have tight quality control over this setting. Is it possible that the problems people are having with these TB swaps are just adjustment issues with the TPS?

Mighty Mineral · Aug 24, 2007

I run the MMR throttle body and have never had a problem with it sticking or causing error codes to trip the check engine lights. I did have the car tuned on a dyno immediately after installation. It is wierd to see so many problems with AM throttle bodies.

Stang457 · Aug 24, 2007

What kind of hp are you running with those mods? Are your happy with your cams?

Mighty Mineral said:
I run the MMR throttle body and have never had a problem with it sticking or causing error codes to trip the check engine lights. I did have the car tuned on a dyno immediately after installation. It is wierd to see so many problems with AM throttle bodies.

Mighty Mineral · Aug 24, 2007

Stang457 said:
What kind of hp are you running with those mods? Are your happy with your cams?

Well I dont want to get flamed too badly so I will just post the dyno charts and spec sheets listing all the variables this weekend. I will only say it was low 4's to the rear wheels on a 91 tune. I had an appointment Thursday but the shop could not follow through..double booking. This next pull I am going to go aggressive on the tuning to see how much she will put to the wheels as I know she has got a lot more in there.

The cams were a challenge as they are more friendly to force fed motors. After the tuning was worked out they made this motor really rev and expanded my power range. I did the cams and heads at the same time which is why the tuning may have been a bit of a prob. The car idles nice and rumbly, they are kind of a give away though as it does not sound OE.

Aftermarket TB's Suck! Beware

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