ok well ive been thinking and talking with weazel about this, it started by me wanting to bore out the main hole that the TB goes because i have a bbk tb and this would make it so the tb actuall makes a difference, then we talked about gasket matching the manifold, then all that led to removing the cmc plates, what do you guys think? possible? worth the work?

and obviously a new tune will be needed, and i plan to do this along with some pacesetter long tubes and single 3" straight pipe and with my jlt intake

discuss

 

Worth the work? What's the goal?

 

I know the Pacesetters and 3" single will give you more power and torque. The 3" single will improve your torque down low.

 

more air in, then tune for the more air so you have more fuel which will mean more power

 

Look at it this way. You might pick up enough flow from port matching the throttle body on a N/A engine to pick up *MAYBE* 1 Hp at 5500 RPM. That's not worth it.


The CMC plates... Don't know if that's even possible. I dont remember what the intake manifold looks like.. but it seems like the "butterflies" were built into the manifold.. You could have to cut them off if thats the case.

If you got the spare time and spare dyno money.. go for it. But don't expect much. Tell us mall about it if you do it.

 

So why did you buy a new TB if the stock one already could out flow the engine?

IMRCs are a very good thing for low end TQ at low TP pos.

The throttle body blade only is at 82* at 100% TP. (NOT FULL OPEN, 90*) FYI

 

well i got the tb basically because at the time i had the extra money for it and no one else on the forums had tried it because it had been advertised as a 75mm when it was reallly 80mm so i was the one to try it out and then relized the manifold was still restricting it so ever since i put it on i had planned on opening it up and after thinking about it i thought why not port the whole thing and do the cmc plate delete while im at it

 

I think you would gain more by porting the heads and adding a good exhaust than messing with the TB/intake.

But thats a guess. I've never tried.

 

OK...

This is for the 5.4l 3v, if anyone wants calcs on the 4.6 just let me know.

The engine will consume 525.4877553CFM at 5500RPM. But we still need to make room for some fuel. A 12.6:1 AFR will reduce the ammount of air at that RPM by 41.7053774CFM. So we come out with 483.7823779CFM that actually flows into the TB. The stock TB is good for ~800CFM. The intake valves can out flow the engine at low lift, low lift on the exhaust side @ .100 is the only area that the heads don't outflow the engine. A lot of engineering went into the intake manifold. The only changes i would make is add another 2" for more low end TQ. And modify and open the IMRC butterflies slightly larger. The IMRC work awesome when they are closed. You can call it pulse tuning. When they are closed the intake valves open, then close causing 0 flow. The pressure bounces off the IMRC plates and charges the air back past the valve.

 

is it similar to what i did on mine? i didn't take a lot of material out though.

 

The 5.4L 3v TB sits on top of the intake manifold which is made of a composit. There is no 90* plenum if thats what you are talking about. Because the ETC only opens the TB to 82* i could possibly see machining the TB butteryfly edge to more of a knife edge. I got an extra 4* out of it because of my tune. If the angle exceeds 86* say hello to your new friend P0126.

 

azmidget91 so how much did you pay for that TB?

 

$319

 

Ok. I checked out my TB while cleaning it and adjusting my TPS

80mm at TB inlet

75mm at TB outlet

75mm at intake manifold inlet

 

Ok. I checked out my TB while cleaning it and adjusting my TPS

80mm at TB inlet

75mm at TB outlet

75mm at intake manifold inlet