RE: TECH: replacing the stock throttle body
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RE: TECH: replacing the stock throttle body - 10/10/2006 2:44:34 PM
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viza
Posts: 72
Joined: 9/22/2006
Status: offline
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quote:
ORIGINAL: Longhaul89
Okay, am I the only one that hates his motoblue?
Installed it, with the batt. disconnected,etc. set the trottle spring one click.
Fired up car, let it run ten minutes like they said. Then after turning it off, started it and drove it. Horrible. Rough, can't maintain a decent steady rpm. Also triggered the failsafe mode on the engine. Will not idle even, hunts and seeks. Car ran great before this change. Have C&L intake, Diablo tuner (with the 91 octane tune) and slightly better exhaust (bassalini x pipe&magnaflow cat back).
I tried again tonight driving it, after disconnecting the battery again for more than 12 hours. Same thing.Failsafe again. I tried to carfeully put some highway miles on it to maybe let it learn and settle in(after hitting reset), but to no avail. Tried adding a click to throttle spring, no change so I moved it back. Real slow to come down from revs,too. Makes shifting fun...I don't know what to change on the tuner, this is out of my scope of things.
Anyone else have simular problems and if so , how did you cure them? If at all.
Appreciate the help as the car is virtually undrivable right now. 
Don't you need to re-tune if you change your setup?
I'd do some research before I turned the ignition on again... I'd betcha some c-notes that you are running way too lean.
-Viz
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RE: TECH: replacing the stock throttle body - 10/11/2006 5:52:33 PM
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chp2150
Posts: 93
Joined: 9/14/2006
From: Boise, Idaho
Status: offline
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emBOSSed,
quote:
Now back to my question: why does 2x55 = 77 and not 110?
I'll see if I can help you out.
The basic area of a circle fromula is A = radius squared x pi (3.14). So knowing this, Area =(27.5 x 27.5) x 3.14. This equals 2374.6 square mm. Double that for both throttle holes and you have 4749.25 sq mm. Now working backwards for a single hole. Take 4749.25 and divide by 3.14, you get 1512.5. Now take the square root of that and you get 38.89 for the radius, x2 for the diameter and you end up with an equivalent hole size of 77.78 mm diameter.
If you remove the throttle body and measure the intake holes for the plastic intake, it's 62mm. That works out to about 88 mm equivalent diameter for a single hole. The Granatelli CAI is 90 mm and so are some of the others. Why Ford is using a smaller TB size is puzzling. If you calculate the size of the dual exhaust, it comes up to about the same as the 88mm diameter. So, if you use an aftermarket intake, a 62 mm throttle body and 2 1/2 inch (stock) exhaust, it is a constant diameter air flow system. Obviously, my electronics knowledge is not applicable to air flow physics!
The difference between the 55 mm diameter TB and the aftermarket TB of 62 mm is about 11% increase in diameter. javascript:void(opener.AddText('[sm/=wakeup.gif]'));self.focus();self.location.href='smiley.asp'
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RE: TECH: replacing the stock throttle body - 11/8/2006 4:37:51 PM
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emBOSSed
Posts: 27
Joined: 7/28/2006
Status: offline
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Thanks CHP2150. That makes sense of it. Do you think the Granatelli one is the way to go? I know some brands have been failing.
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RE: TECH: replacing the stock throttle body - 12/9/2006 10:45:38 PM
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My05GT
Posts: 77
Joined: 7/29/2005
Status: offline
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Well...I finally attempted the install of my GMS TB today. I've had it sitting in the garage for some time now. Just never got around to it. The install seemed to go fine, no real issues - I did snap a couple of the screws when removing the gear cover. So I reassembled the new TB got eveything buttoned up, started it up - failsafe mode. ****! I figured it was the spring inside there. Took it all apart, reset it - FailSafe Mode. Damn!. Long story short, I can't get it adjusted right. Everytime I think I have it, I get FAILSAFE MODE! I'm a bit disgusted. What should have been about an hour job, took 4hrs and I didn't even get it working! I just decided to pack it up for the night.
So...any suggestions? I could disassemble it again and try setting the tension. I tried to follow the notes posted here on TB replacement. They were well done. Question: What position does the gear have to be in when putting it back together? Up close to that stop screw? or down in the other direction?
I lined up the tangs with the appropriate holes, put the gear cover on, took that little lid off, turned the spring tensioner 3/4 counter-clockwise. The tangs obviously didn't match up, but it did hold there. Still....got the failsafe mode. I'm ready to rip it all off (CAI too). But I'm afraid it I can't get the spring tension adjusted right on this one, I probably can't get it done on the stock TB :(
Any help? Anyone have a good exploded-view diagram of the TB? How about snapping a pic of the TB with the little lid off, so I can see where the tangs are in relation to everything when installed.
Dave
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RE: TECH: replacing the stock throttle body - 12/9/2006 11:31:54 PM
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rex7010
Posts: 670
Joined: 3/25/2006
Status: offline
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My05GT
Your car ran fine before this right...??? so put your stock one back on and take one on the chin..
I am not slamming on you ( so please don't take that this the wrong way )
but if my car ran fine.. and I am only going to get just a few more HP out of something that is driving me nuts..
then I would throw the thing away .. or put it up on flebay... not every mod is a good mod.. and this one seems to fall into that....
JMO and only that.. but .. maybe somebody else can help you out..??? but to me.. it just doesn't seem like it is worth all the trouble for just a few more HP...
best of luck in whatever you decide on this..
R
_____________________________
06 GT Auto, Redfire Metallic, With ALL the toys.. C&L w/ SCT & custom tune. FRPP 3.73's.
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