62mm throttlebody idle problems

theRedStorm

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I picked up a 62mm throttlebody. Installed it and used my sct x4 set to 62mm throttlebody. Idle jumps to 1300 and slowly comes down. Car. Shakes vigorously when the idle is below 1000 rpm. I reinstalled stock one for now. What causes this issue?
 

07 Boss

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Don't you have to match some kind of voltage reading on the TB's so it is calibrated properly?
 

Dino Dino Bambino

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The TPS voltage needs to be set to factory spec and yes, rule out a vacuum leak.
If it isn't a Ford Racing 62mm TΒ, the butterfly actuator mechanism probably has cheap plastic gears that are prone to stick or jam.
 

theRedStorm

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20190623_005908.jpg 20190623_005927.jpg 20190623_005915.jpg here's the throttlebody I have. It came pre-assembled. Do I open the side to adjust the voltage?
 

Dino Dino Bambino

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The TPS voltage is adjusted with the TB mounted on the engine and wiring harnesses connected.
Here's a Youtube video about how to adjust the TPS:

 

07gts197

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Is that a gt500 throttle body? If so thats the issue, it needs an adaptor plate or it will not sit in the correct position causing vacuum leaks. If not, then disregard.


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Badd GT

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quick google search of the G273n casting on the throttlebody looks like its a gt500 60mm throttlebody and wont fit right on your intake. Im not aware of a 62mm throttlebody made by ford for a 3v. Ford racing makes one but it is shiny chrome and thats obviously not what you have
 

JeremyH

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That's a gt500 60mm tb. Unless tps voltage is exact no canned tune setting will even remotely work. What is your setup that warrants it? Unless its max effort na or boosted with custom tuning dont bother, put your stock tb back on and leave it alone.

.
 

07gts197

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I got one for next to nothing so I bought an adaptor and ran it. But mine didnt have the holes bored out for the adaptor screws so I had to use zip ties to center the bolts (dont ask) and already had free tunes for life so I was in it for the adaptor plate and whatever I paid for the tb, which wasnt much. If I hadnt gotten it for what I did and didnt have free tunes for life I would have passed.


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Pentalab

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I picked up a 62mm throttlebody. Installed it and used my sct x4 set to 62mm throttlebody. Idle jumps to 1300 and slowly comes down. Car. Shakes vigorously when the idle is below 1000 rpm. I reinstalled stock one for now. What causes this issue?

If you are NA, a twin 60 mm (with adaptor)... or twin 62mm...is a total wasted effort. Oem tb is twin 55 mm.

Twin 60mm is 19% more surface area vs oem twin 55mm. Twin 62mm is 27% more surface area vs oem twin 55mm.

FRPP twin 62mm works good..if you have a blower.....AND a real CAI if the car is a 05-09.
 

eighty6gt

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try a bama tune I heard they can fix this sort of thing right up!!
 

Pentalab

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The TPS voltage is adjusted with the TB mounted on the engine and wiring harnesses connected.
Here's a Youtube video about how to adjust the TPS:


Agreed. If he wants to use a TB other than OEM, the oem twin 55 mm TB tps voltage has to 1st be measured using a DVM. New / bigger tb then tweaked...to the same oem voltage measurement.

The only exception would be if a FRPP twin 62mm TB was installed. The oem tb..and the FRPP twin 62mm tb are both made by acufab.
 

Granatelli

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that looks like the regular factory 3v throttlebody

35.jpg


This is not meant to be an advert. I am merely trying to help the consumer
 

Granatelli

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^^ That and check and make sure you don't have a vacuum leak.


Agreed 1000% If you have a vacuum Leak its lights out


If it isn't a Ford Racing 62mm TΒ, the butterfly actuator mechanism probably has cheap plastic gears that are prone to stick or jam.


Most all of them are plastic gears. We offered an all billet 3v throttle body years ago with brass gears but plastic is pretty much the standard


If you are NA, a twin 60 mm (with adaptor)... or twin 62mm...is a total wasted effort. OEM TB is twin 55 mm.


Twin 60mm is 19% more surface area vs oem twin 55mm. Twin 62mm is 27% more surface area vs OEM twin 55mm.


FRPP twin 62mm works good..if you have a blower.....AND a real CAI if the car is a 05-09.


There is no such thing as a wasted effort when it comes to increasing airflow into the engine. A larger throttle body factually will help. You are only as strong as your weakest link. If you install an aftermarket CAI for max flow and then the air is crowded when going through the blades of the t-body it hurts performance. Draw through superchargers like Roush, VMP, Magnuson, Ford Racing etc WILL ALWAYS work better with a larger throttle body because they are doing their best to suck air and compress it. If you are running a turbo or centrifugal blower like Paxton, Vortech or Procharger then the throttle body is not as important because they are “pushing” the air before the throttle body. Although what I am telling you is true based on physics and although the turbo or centrifugal style is not as dependent on a larger throttle body…it still helps a little. Basically bigger is better especially when there is a mass airflow sensor in the mix to measure the air flow.


More direct as it relates to the question - yes check the TPS voltage setting with the key on engine off and make sure it mimic the stock setting of your 55mm twins. Bama, VMP whoever can help you as well with a tune. Either way they need to know they are starting out with a stock adjust TPS setting.
 

Granatelli

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Fuck you, without a stock throttlebody next to it for comparison, that looks exactly like a 3v throttle body
:flamethr: Why the hostile approach

The stock part is directly stacked on the bigger unit. Center to Center. It crystal clear how much larger the bottom is over the stock top. Either way, it was already calculated to be an increase of 19%. Using Pentalabs math in post 15 that would be an available increase in airflow of well over 100 CFM.

Rodney King - "why cant we just all get along"
 

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