How To: Modify a 4.0L OHV Throttle Body..

[boggs1227]

ok. mines all stock ...anyone else want to comment ?

 

[fordnut71]

1 thing tho put a lil bit of thread locker on the pivot bolt for the blade. i had mine fall out last week on my way home while i was driving on the highway no less. tho it was almost a year ago iv done this, i had to find a bolt that would fit the t/b housing. but its a great free mod.

 

[NEWDUCK]

Im having a really hard time believing this works. Is anyone else on the same boat? Not trying to dis or bash on anyone that is a great believer in the power gains but i really dont see it happening.

 

[robmurt04]

If it didn't work why would there be all of us saying it did? There's no harm done by this modification if you do it right. The reason why my check engine light came on is actually my own fault because the spring load on the TPS sensor got screwed up. Not anything from the modification just me playing with it broke it.

 

[fordnut71]

if it didnt really work ,then y does ford have this done with throttlebody on the sohc motor. thinking about it now ford has done this with most of the new motors.

 

[robmurt04]

That and spdrcr has been pushing about 160HP and 240TRQ to the wheels if I'm not mistakened with this type of set up & other DIY modifications. I'm sure he knows what he's doing & that it works.

 

[Spdrcer34]

Last dyno was 169/271, that was with an underdrive pulley, no 2nd cat, no muffler. A few months later, I blew another transmission....

Yes, it works. Works very well. I won't go on to say that it worked BETTER than the BBK I had on there before, as the BBK had a better transition from the smooth bore of the throttle blade, to the front of the body. But I did NOT notice a difference when I went from my BBK to the modified TB.

Ryan

 

[jd4242]

i know this is an old thread,why hasnt anyone tried to do this to the bbk or can it not be done?
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[geoph1986]

i know this is an old thread,why hasnt anyone tried to do this to the bbk or can it not be done?
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Probably hasn't been done because the BBK already flows more air, and is expensive.

 

[jd4242]

well if i can get my bbk to flow even more for free why not.
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[geoph1986]

Don't forget, that unless you have a way to exhaust all the extra air coming in, your X won't be at it's full potential.

 

[jd4242]

dude my motor is NO where near stock

 

[geoph1986]

dude my motor is NO where near stock

I gathered that from your signature. I was just mentioning exhaust, because that is one thing that is so overlooked. Let us know how the BBK mod works out.

 

[jd4242]

yea it prob shouldnt be done to the bbk on a stock motor,just wish someone had done it before
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[Currency]

It sounds like it's worth a shot. If everyone does it right I don't see any harm being done. Maybe a slight gain. I may try this later or have the engine shop do it when they rebuild and bore out my motor.

 

[Spdrcer34]

The BBK's throttle shaft has been flattened around the blade. Unlike the Stock TB's shaft that was left round from end to end.

Ryan

 

[jd4242]

yea when i went to do it i noticed that and all ready decided not to do it

 

[twoll86]

i dont understnad thi smod can some one inlighten me

 

[Spdrcer34]

By shaving the shaft, you are smoothing out the airflow as it goes across the front/top (depending on the position) of the throttle blade.

You are also allowing a little more air into the engine....it's been dyno proven time and time again.

Ryan

 

[twoll86]

By shaving the shaft, you are smoothing out the airflow as it goes across the front/top (depending on the position) of the throttle blade.

You are also allowing a little more air into the engine....it's been dyno proven time and time again.

Ryan

so if i understand this correctly you are milling down the cross shaft to make the butterfly sit flush?