any good write-ups out there to do this myself? You think I will see any gain in doing this?

 

if you're lucky...2hp

not all that effective of a mod, have yet to see any track or dyno proof of gains.

 

So you guys agree don't bother with this?

 

if yo have time to kill and want to do something it can't hurt.

all you do is take a dremel or die grinder and smooth out the little lip just in front of the throttle blade.

 

i did it, you will be suprised how much material is blocking off the throttle body bore, it has to help, along with the egr tube mod, and airbox mod

 

how does everyone get that nice polished look out of the throttle bodies? What do they use? I have a type of dremel. It is an air tool. What can I get sanding stone or what? to smooth it out? Thanks.

 

I sent mine out and got it ported & powdercoated for $130. Don't know if it helps? but I'll bet it didn't hurt

 

use your dremel or die grinder then use sand paper by hand-start with 80 grit and work your way up to 400

 

ok jay I'm sorry I'm a moron. Let me say that in advance. That is why I was asking for install instructions. What should I grind exactly, and you say start with 80 grit sand paper and work my way to 400 does that mean to scrub with 80 grit for a bit then 85 then 90 then 100 or what? Again sorry for being dumb.

 

sandpaper usually goes in bigger increments.

i say start with 80, then move to 100, then 200, then 400, and them maybe 1000 or some polishing compound if you really want a shine.

seems like i've heard of guys grinding, then using a bore hone, or whatever it is called that goes in a drill and hones the inside of cylinders.

 

ok teke I'm beginning to understand now, but do you know of a writeup anywhere for how to polish anything? For example I go out get some kind of die grinder for my dremel. Grind away the inside until it is smooth, nicely rounded. Then, I use sandpaper and sand around with the 80 first by hand then sand with the 100 then 200 then 400. Then take a polishing compound like I use on my rims, and polish it up for the finishing touch? Is that close to correct?

 

IMHO do not do so called porting of TB or MAF.
Engine does not need it and in most cases will cause ill with the PCM calibration and the adaptive strategy operating software.
This can cause surging, unmetered airflow and high lean conditions when lifting off the gas pedal and PCM still has fuel learn on.

In every case where I had a customer who "ported" the results were negative and when stock MAF or TB put back on the problems went away.

Porting those to parts does NOT increase the intake runners or cylinder volume when the stock parts already support from 750 to 850 CFM of air when your engine never really uses more then about 630 CFM.

 

the polishing compound isn't even really neccessary....it was more of a tongue in cheak comment.

it will get pretty smooth and shiny with just the high grit sandpaper

if i were you i would figure out the diameter of the area you want to port, then the amount of material to remove and make a tool of some kind to measure which parts need more grinding...kindda like a template. this way you can see the high spots. granted it isn't anything that needs to be PERFECT, but it's always nice to be damn close.

as for the problems with porting...i can see problems with the maf (kindda) since it's a calibrated sensor. but i don't see how less restrictive airflow through the TB could cause problems.

 

here is a pic of a professionally ported tb done by MASC (supporting vendor).

you can see how the inside of the tb is smooth all the way up to the blade, no lip.

granted this was probably done with a mill or lathe which is why it is so perfectly round, but you get the idea

 

I got 7 rwhp and 11 rwtq from a ported tb but no no gains. comeone at least no what yoru talking about before telling someone not to do something. Mike I would have someone that has done it before do it but if you really want to all you do is port it all flat and smooth get rid of the edges but do not go right up to the blade the blade needs to keep contact with the edge or it will leak and run rough.