Hi guys i decided i would stick to my stock throttle body just b/c i will not be doing any major mods besides the ones in my sig. Does anyone know how to port a stock throttle body or anyone who does it? If yes, is there any detailed procedure in how to do it or how much it costs to have it shipped and done.

 

what kinda gains should i expect?

 

would you consider this mod to do?

 

Yes i would do it if I were you. I ported mine myself and it had a great seat of hte pants feel at lower RPMs. It REALLY increases throttle response. I wouldnt pay to get it done though, only took me 3 hours start to finish. i found a guide somewhere... lost it though.

 

Here's a crash-course guide:

After removal, take off the TPS, and IAC and remove the throttle blade/srping thing.

What you'll have now is just a TB casting, all aluminum, one piece.

You remove the most material from where the blade closes/opens.

Alot of people remove the top bar from the TB blade shaft thing, and grind down the 2 screws.

heres pics of mine. (sorry its huge and unfocused, but you get the idea)

 

You can buy A&B epoxy from summit to fill in that hole. Its 24 bucks from summit. I've used the moroso brand and it is the ****. 1 pound will probably do about 20 TBs.

Jon

 

Double that....($150)

I wouldn't recommend doing this. That hole is how your car's idle is maintained. You can cause problems by filling it in.

 

yes you are... lol shut up and get your hands on one already!

But ya dont hill in the iac ports, It doesnt negatively effect HP anyway. Most people who do fill it have to drill it out anyway.

 

thanks for the help guys!

 

What's holding you back?

 

i think budget and availibility.

 

if you port your throttle body its gonna throw the maf off.
the maf will think its running less air than it really is and will make the engine lean.
You have to recalibrate the MAF using a wideband sensor.
On a stock LS1 this will only give like 5-8hp anyways.

 

Wow, where to begin dispelling all the flase information...

1. EGR will not stop the TB blade from opening 90%. Some TB's require simple filing of the bump stop on the TB it's self to open more.
http://installuniversity.com/install...sity/index.htm
Plus a simple look in ls1650's sig shows he has an LS6 intake and thus, no stock EGR if he even has one.

2. If you fill in the ports it will mess it up, BUT you can fill it with a couple tube place in for air flow or drill holes in the epoxy for airflow.
http://www.s2performance.net/
Here is a little how to:
http://www.ls1howto.com/content/infopics/tbport.jpg
You can also use JB weld. Cost is much less than the other epoxy mentioned. There are other brands available at most hardware stores.
The people who have to drilled them out did it wrong. I would imagine the one in the how to would have airflow probs.

3. Porting the TB WILL NOT throw the MAF off. You WILL NOT have to recalibrate it. The MAF is upstream from the TB. This is like saying you have to recalibrate after an LS6 intake install. Don't play with the MAF, let a tune take care of your A/F ratio.

4. At your stage of mods, you'll most likely just feel an increase in throttle response by doing this.

There are also other things that can be done like knifing the edge of the blade, smoothing the screw heads that hold the blade etc.

 

Actually, two of those are right.

Anything that obstructs the flow of air to the IAC valve (whether tubes are there or not) will affect the cars ability to control airflow in off-throttle situations. The PCM refers to a table that converts "steps" into surface area (square mm of air). Steps are fixed points (0-310 I believe) the IAC will open to and that table converts those steps into airflow. Change the opening and you change the surface area open for each step. See pic from my copy of EFI Live...



Also, any aftermarket modification that alters the airflow characteristics of the motor (catback, LS6 intake, lid, cam, heads, etc.) will alter the settings for the MAF. With my mods (in sig), I've had to increase my MAF sensor by 10% in the WOT areas to compensate for the additional airflow. Until you understand the workings of the PCM when it comes to things like fuel trims, volumetric efficiency tables and MAF recalibration, you shouldn't state what you think is true and false. It just adds more confusion to those who don't know and are here for solid advice.

 

i think i should rather ship it out and have it ported by a professional who knows what they are doing.