Tony71502

What is the bore on the stock throttle body, egr spacer, and upper intake plenum? 63mm? 65mm?

If I removed the EGR spacer where's a good location to re-attach the throttle cable bracket?

luckythirteen13

i believe its 60mm. and there is no hp benefit to removing the egr spacer so you might as well just leave it

w8less

i thought it was 58mm on the foxes and 60m on the sn cars

FivePointOhh

pretty sure its 55mm on stock foxes. maybe thats the maf. i dunno.

leave the EGR and block off the holes.

dv3

lol..so its either 55, 58, 60, 63, or 65mm
sorry i have no real input

Tony71502

I know it won't benefit me performance wise... but it's an eye sore. No coolant lines or EGR running to at anymore. I was considering a spacer with the bracket and no EGR hole, but the smallest bore is 60mm.

Liquid_02

it's 59mm.

Then you lose your throttle cable bracketry. Sure you can always fab something up, but that will be even more of an eye sore. Or you could just get a plate like I did.

FivePointOhh

go get a throttle body off an exploder. its a 65mm (i think, maybe 60mm)and just get a 65mm(or 60mm) spacer. then you just need to massage out the intake opening of your plenum to accept the bigger size

Tony71502

Well the egr spacer I wanted to get from RJM Injection tech actually has the throttle cable bracket on it. Boring the upper intake out is no problem, but Idk if I want a bigger throttle body yet. It may flow too much air for a stock block.

A 1mm larger EGR spacer shouldn't be a problem if stock is 59mm.

FivePointOhh

it disrupts the gradual tunneling of air.

imagine a tornado. in the clouds its as large as it can be.(this is your filter) ....as you get closer to the ground it is, generally speaking, significantly more narrow(intake runner) disrupting this gradual step down of the air causes turbulance. turbulance slows air speed at specific points cause excessive noise and lower velocity.

there is more to air flow as well, its not neccesarily the amount of air you can flow its the shape in which it arrives.
example of this being. imagine a fire drill and everyone freaks out and you have a mass stampede trying to leave out one door. you have this huge cluster ****, people get hurt and it take a long time to get everyone out. now you take that same volume of people in the same situation, file them up and have them run out the door 1-2 at a time. you just you just flowed the same volume of people down the same runner size in half the amount of time.



ahving mis matched intake sizes and not match ports means your intake or heads are not flowing at what they are capable of and for sure not the speeds that could plausibly do. lost performance. you have to make sure everything is matched. even a poorly placed gasket will cause this turbulance and possibly disrupt airflow into your cylinders. its not about size in this case, its efficiency.