This guy quoted me $200 with a 1 week turnaround (including shipping both ways).

Maxbore.com throttle body boring service and repair


I'm gonna do it, just haven't gotten around to it.

Gotcha. Well all i want to say is their porting is rough because they said really smoothing it did nothing power wise but cost went up. I think we can port smooth so it looks quality and price is lower. Power wise I bet they are even. I mean let's be real, we are only removing a mm or two from the part. One company can't out do another on that point.

i mean these are always a sexy little option lol

More Engine Development – 414whp with Kels *Video* : OnPoint Dyno

There may be a knowledge issue, but that can be gotten around with enough trial and error.

I suspect that Z1 probably ruined a fair number of these plenums before they found the results they wanted. Your guy gets one shot at it, if it works it works, if not it doesn't.

Like I said, I hope it works, can't wait to see results.

Yeah if you can go to HR heads, get big cams, hella expensive ITBs etc.

Good stuff..

Not a bad price with shipping. Actual labor cost then seems on par with IPS. He told me most TB's (they are a GM mostly company) like the huge corvette TB's are at like $65-70 each. So $140 plus shipping for us I'd guess.

Exactly, because it's two of them.. twice the work and twice the materials (includes new butterflies and stuff).

still kinda sexy and 414whp N/A is impressive lol

Wait so $140 for IPS with knife edge and PnP, his are $179 PnP but its PnP'd all the way through with a new BF. That's a good cost. Will $39 equal more power, hmmm?

Not bad for 200$
I strongly suggest to do more than just boring those TB ;)

he has another option for those TB which is TB Shaft machining. $35 each.
since you can have quite a bit more flow doing this.

its kind of odd he doesn't have a knife edged butterfly plate though...


This is what I used for the pass few years :)
http://www.the370z.com/members/megan...ure42412-a.jpg

True. Z1's made mistakes too. They've sent out manis with holes in them filled with resin to patch it up.

In your opinion, as you have experience with bored throttle bodies, will I have any tuning/idle problems if I go this way?

you will need to adjust the idle screw which look to be locktighted very strongly btw.

then if you know what you are doing with the tune. you wont have any problem



again,
I prefer to mention it often, you need a different intake setup other than OEM because you MUST have a bigger intake tube especialy the MAF tube. if you arent doing it right , boring a TB to his maximun as I did , you wont get much of any gain
this is boring 2.5mm out , cut the shaft in half , flush screws , arrow edged butterfly plate.

edit again ,,, if you dont have a very good flowing exhaust ... forget about this mod ! ,,

Can you run without a tune?
No, I don't want max power. Just will it run ok without having weird idle issues and such?

if you still have the stock airbox, yes you could run without a tune, but I dont recommand it at all !

but any bored out TB , you will probably have to adjust that idle screw.
I had in my case, it didnt let the engine run lower than 1200rpm