Big Jim M
New Member
- Joined
- Apr 18, 2008
- Messages
- 2,728
- Reaction score
- 30
- Points
- 0
- Age
- 86
- Location
- Austin
- Vehicle Year
- 2002
- Make / Model
- Ford
- Engine Size
- 4.0
- Transmission
- Manual
Howdy James
HOWEVER the engine cannot get up there as it is built without grenading! So in order to USE a bigger TB you must first BUILD the engine to run at 8,000 and above. WITHOUT such a build the bigger TB will only be a henderance when used at lower rpm.
AS BUILT the TB supplies all the air the engine can injest. With the bigger one on there the engine will FALL ON IT"S FACE off the line!
The intake system DEPENDS on a certain VELOCITY of the intake air. This velocity is what helps FILL the cylinders. Without that velocity the engine won't preform at lower rpm.
Don't think for one minute the engineers at Ford didn't take EVERYTHING into consideration when designing the TB on your engine.
Big JIm
What you ned to get grip on is this>>> With the bigger throttle body the engine will be able to suck in enough air to go beyond the 5500/6000 rpm it now has enough air to accomplish.I guess i just can't wrap my head around the fact that a comparable sized motor ( duratec 2.5's in contours, 3.0 duratec's in taurus's, the 3.3 in a dodge intrepid) all have such noticeably bigger throttle bodies and such if the cylinder is only a given size. I understand the principle of what you're saying, but i think that the throttle is a fair bit smaller than it ought to be. Of course I haven't cracked mine off to see how thick the casting for the upper is, but im sure a TB could be a bit bigger before its pointless.
Best illustration I can find is this link:
http://www.cardomain.com/ride/333436/1995-ford-ranger-regular-cab-tacoma-wa-us?p=4
The tricky part is that rangers have the IAC on the TB instead of the intake, and many sites that extoll the virtues of such a swap walk thru how to do it with a composite intake, which has the IAC on the upper intake. So either I'm sorta venturing into unknow territiry (I have the stock 1999 intake) or I'd have to swap to a composite which I've heard pros and cons about as well, so I'm sorta reaching out to see what others have done. The more I think about it, the more I think a 3.8 might work even though the throttle linkage and TPS are flipped but the pull is the same direction....
HOWEVER the engine cannot get up there as it is built without grenading! So in order to USE a bigger TB you must first BUILD the engine to run at 8,000 and above. WITHOUT such a build the bigger TB will only be a henderance when used at lower rpm.
AS BUILT the TB supplies all the air the engine can injest. With the bigger one on there the engine will FALL ON IT"S FACE off the line!
The intake system DEPENDS on a certain VELOCITY of the intake air. This velocity is what helps FILL the cylinders. Without that velocity the engine won't preform at lower rpm.
Don't think for one minute the engineers at Ford didn't take EVERYTHING into consideration when designing the TB on your engine.
Big JIm