legacycentral bbs

a few weeks ago i bought a throtle from our good friend and owner of the ghetto garage, Matt monson.

about 2 days ago i ported and polished it taking about 3mm off the entire thing as far down to the butterfly plate on both sides i could go. i even gave it a knife edge at the entrance. i also had more material to go if i wanted to but i didnt want to push it too much

after a few days of driving there is a noticeable inprovement in throtle response and high boost kicks more ass than ever before.

i gave my brother a ride last night, he has a 350z and its a fun car no doubt but when he was riding with me i rolled off the line in 1 slowly ,because there was a cop going the other direction, and flored it. all he could say was "wooooohhhhhhhhhhhhhhhh" adn ive given him rides at the same boost before.

hopefully ill have pics as soon as my friend sends them to me which will probaly be never but ill get them somehow eventualy.

i cant remember where i put it right now but if i get some time and find my stock one id be glad to sell it to someone to try this mod or mod it for them and sell. its great to have an extra too becasue theres no rush to do it and you can take your time with the port.

for tools i use my neighbors air tools and a carbide bit die grinder, sand rolls and a dremmel powered polishing kit.

edit,

after almost a year ive gotten pic

thats cool.

paul eklund extrude honed his intake manifold on his EJ22t and bored the throttle body. said they were the two biggest improvements he made to the engine.

Any idea how much the extrude hone cost? I talked to those guys at a machining conference a few years ago and checked out the equipment, cool stuff.

not sure how much extrude hone costs but it looks like some time w/a dremel and a spare TB make for a good return on your investment.

do you have any pics?

pics comming soon. my friend is really lazy

I've got a spare throttle body that I need to shave down, I might as well do this also. No reason not to.

Did you unbolt the butterfly from the throttle body to knife edge it?

no. i clamped it open. i knife edged the entrance of the tb not the butterfly plate itself. you need a really steady hand to do the plate on or off the throtle body and imo its not worth the chance of screwing up.

I think I am gonna unbolt it and give it a shot on my grinder and just go real slow. That's what spare throttle bodies are for

good luck. oh and when you do it let us know how you got it off. i did try to unbolt it in the begining but its not as easy as it looks.

that and just an idea but you could take the plate down to a cutlery shop and have them sharpen it. im sure they'd be really good

This may sound silly but I've never taken off the throttle body and intake and really looked at them... I had always thought that these things had to be really to spec and circular. I'm sure you guys are taking it slow and are good but what kind of tolerances are you guys doing, .001, .005, .01? Do you all have any before and after pics? This sounds interesting and easy to do, just time consuming.

it depends what bits your using for time. i used pure carbide bits that took off alot of material at a time. i was also using air tools. if you use a dremmel and stones youll need alot of lube and time.

when you do it you just go down to where your comfortable. i want to do it again and port it down further getting it thinner than i have it now but you can see how far your going. the metal changes color as you go down so you can see where you missed a spot.

in reality the material is not thick enough for you to get in out of spec circular wise.

It's not gonna do much for us na folk.

Sounds easy enough to do, I'll have to keep that in mind later down the road when I get another enginer. I'm inclined to agree with Scott that it won't do my NA much but someday I'll have a worthy engine.

I checked on the extrude hone of an intake manifold..
PnP headjob is around $1k, the extrude hone on an intake manifold would be ~$1350..

bump for pic finaly