Ported throttle body

[Vlad0691]

How hard would it be to port your own throttle body? Like if you use a Dremel tool and do it?

[Whiplash Performance]

How hard would it be to port your own throttle body? Like if you use a Dremel tool and do it?

Yeah you can port with just a rotatory tool.
Just word of advice:
Just bring down the lip and blend it into the rest of the mouth of the throttle body.

Don't touch anything around the throttle blade, you'll screw up your idle. So don't increase the diameter of the throttle body.


Just make sure you take off a little at a time and make as smooth as possible (evenly taking away metal)

[Vlad0691]

So when I port ONLY grind down that lip on the side to make it a perfect straight-through pipe?

[Bio248]

yes. take out the MAF hump and smooth everything out. do not grind down near the throttle plate because it wont seal anymore.

[Vlad0691]

Okay, thanks. What exactly is the MAF hump there for anyway? Just another random GM genius? haha.

And what else will it do performance-wise other than increase throttle response.

[blueguy]

Hey guys...car in avatar...is his car. Your TB is drive by wire...only thing I would do is smooth it out with some different grits of sandpaper if you must...there are no gains to be had from a '04+ TB...plus, your no where near the mod level to be needing that done. Get the HV3 mang...if you want to port something...port the lower intake manifold runners and gasket match them to the intake gaskets.

[Vlad0691]

So porting out my '04 won't increase throttle response?

And the HV3 insert or headers I'm ordering this weekend. Don't know which yet.

[Bio248]

oof, im dumb. my bad, dude. yeah, no gains to be had with any throttle body work. leave it alone.

[Vlad0691]

Well okay then, thanks. And I'm ordering headers tomorrow. Chicka chicka yeahhhh

[Kejross]

Isn't there some kind of electronic mod to increase the throttle respone on that DBW BS? Your really limited by the PCM opening it slowly to manage torque... At least thats how it is on my gramps new silverado from what I remember reading. When I borrowed his truck I could punch it to the floor going up a hill and no change. My 98 gmc v6 feels like it has more power than his 5.3 with over 100HP more.

[blueguy]

Probably a tune would fix it...my Cobalt is DBW, and I smoothed the intake runners on the manifold and polished both inlet and outlet of the throttle body with some different grit sandpaper...and considering the car is pretty underpowered...I DID notice a little better throttle response...not sure how it would work on your car though.

[Bio248]

i had to play with my DBW tables on my subbie to get the car to be more driveable. it helped out a lot for how it drives.

[blueguy]

I bet I would care about them a TON more if my balt was a 5-spd...but its not. Lame.

[Bio248]

i actually had to REDUCE the throttle response because it was commandling like 30% throttle almost immediately when i touched the pedal. made it very hard to take off from a stop without revving the crap out of the motor. now that i backed it off and made the throttle mapping more linear its a dream in comparison to how i bought it.

[TheOtherNick]

hptuners cant adjust the dbw tables, looked for them on my bosses truck.

[rmcardle3]

I am preparing for the L67 (Gen3) to Gen 5 swap. I just recieved my Gen 5 M90. I am trying to make sure I have everything I need for a smooth swap.

Can someone please remind me why I am worried about using my 2000 L67 Throttle Body/TPS/MAF.

(Besides the fact that I want to port my TB, LIM and M90).

There has got to be a reason it won't just bolt and go, right?

[TheOtherNick]

You need an adapter.

[rmcardle3]

Yes, thank you!

Gen 5 to L67: = It's like $75.00 @ ZZP right?
(But this is the lame alternative, because it uses the lame stock TB, right?)

Gen5 to LS1/LQ4: = This is the reason I can't get my parts list together.
(It's like a kazillion dollars for this one because of the Adapter/ TB /MAF, right? + Import the LQ4 MAF Table right?)


Sorry for the drama, just trying to keep it straight in my head.

[Ricky21]

Sorry to thread jack and bring an oldie back but I am looking to upgrade my tb this spring and probly just going to bring mine to a machine shop while my car is torn apart for porting my blower. So is getting rid of that maf hump the best way to go i take it? is it worth doing even?

[blueguy]

You can...but you will need a MAF tune to fully benefit from porting the stocker.