If i wanted to bore out a throttle body how would i go about this.
Lce wants way to much for a new oversized throttle body. my dads a machinist and i think he could pull this off. and i dont know if i'll need a new butterfly of what

 

Why would you want to bore it out? Yeah, if you make a hole bigger the butterfly will obviously be smaller...its common sense.

I guess you could use a die grinder and grind it down. Then make a new butterfly. But sounds pretty risky.

 

Uhh, Trevor you do realize thats basically what lce sells, a bored out intake...honestly if you dont have exhaust mods, I dont think this will make a huge noticable difference. If your gonna have your dad do it..are you just gonna do the front top where the butterfly is..? I think you should do the ports too...

 

I wonder how much you'd be able to take off before you accidentally cut into the idle air bypass. One of the Supra TBs is larger than the LCE TB apparently.

 

Good point matt, thats something the OP would need to find out...

 

Yeah I know, but he wanted to do it himself (thats what I gathered out of the post) and I dont think he realizes how hard that would be.

 

Umm, I really dont think it would be that terrible of a job...

 

maybe get a spare from a junkyard to practice on. if you can get one cheap.

 

It's not that hard, I did it to mine when I was at a machine shop (actually had it done to mine, I did not perform the work..) The guy charged me $80 to bore it out 3mm and make a new throttle plate 3mm bigger (I don't think the throttle plate is a perfect circle, so make it accordingly). It wasn't a big deal at all and the aluminum Toyota uses is really high quality and machined nicely.
Did it do anything? Does anything on the 3.0 do anything? I don't know, I was doing headers and fixing an exhaust valve at the same time. This is probably a good mod to do in conjunction with the supra afm mod (which I never did), by itself I doubt it does much.

 

First, lay down the crack pipe.

Next install that Tornado you've been dreaming about, may as well upgrade to a K&N filter while you're at it.

The VAFM metering restricts the airflow WAY more than anything else in the stream. If you're not going to do anything about that, you're just wasting your time. After that, the exhaust manifold is probably more of an issue than the intake path and headers would be money better spent - they made a bit of a difference on my 22R. THEN maybe you would get some benefit to upgrading the intake side.

 

on that note, TC, would it be plausible to bore out your VFAM? and make a new "flapper"?

 

why would you want to do that?
the 22RTE uses the same VAFM as the 22RE and makes more power so it would seem the VAFM is not a significant restricion.
... and don't use the turbo as an excuse- the air still goes through the VAFM to be measured and the 22RTE does not have a MAP sensor.

 

I agree with tc, the afm would need changing before you see any benefit from this. However if your dad wants to do it and it won't cost anything, I say do it, it's not that hard. Mine was on a V6 though and I don't know how undersized the TB is on a 22re. This way if you do the other things later you should see more of a benefit from them.

 

x3 The Vafm intake is TINY. Way smaller then the TB inlet. Work your way through it, Vafm first, intake then TB. Then compliment it with some exhaust work. Then throw in a cam!!!

 

Why not get a 5mge or 7mge throttle body? From what I heard they are a bigger bore 55mm 5m or 60mm 7m from what I have heard. The celica guys have been doing this to their 22re's for a while from what I gather..

 

abe, i meant for the 3.0... since it is one of the biggest restrictions on our motors, would it be plausible?

 

where can i get a bigger bore tb for my 22re? i know lce has one, but does neone sell a bigger one?

 

If the throttle body is capable of flowing more air than the engine is capable of drawing, there's little to no benefit with a larger throttle body, and may actually work to the detriment of engine performance (not enough air velocity to pack the cylinders) at wider throttle openings, and reduce mileage at part throttle openings due to small changes in throttle plate angle making large changes in air flow.
A progressive two-stage (one small port, one larger port linked to start opening at 1/4-1/3 opening of the smaller port), or even a two-port (two ports / butterflies smaller than stock but with total cross-section larger than the stock throttle body) would be a better solution than a single port large throttle body.

 

I had a spare 22re TB to practice on, I used a dremel to smooth out all the machining then took the shaft and cut half it off still retaining the threaded side (also profiled this down as well)- I ordered ss machine screws and lock tighted them in and ground off the protruding ends. Not on the truck yet and I don't have a flow bench...but it was an interesting excercise and cost me a box of screws. Toyota made these so ridiculously heavy duty that my mods cost nothing in reliability. I paid bucks for this on my TPI.