porting 3.4 throttle body?

[ChronoGN]

Hmm.. Then I need a 99+ sensor..
Does 99+ GTP have the same sensor? It looks the same.

[ChronoGN]

<blockquote>quote:</font><hr>Originally posted by ChronoGN:
Hmm.. Then I need a 99+ sensor. Does it need fabrication to fit or will it just bolt right in?
Does 99+ GTP have the same sensor? My friend has a 2000 GTP and the MAF sensor and the throttle body looks the same as the one on my car.<hr></blockquote>

[Coriya71]

I think it is. I check out numbers on GMpartsdirect one time. You can always check to make sure.

[StudlyCamaro]

<blockquote>quote:</font><hr>Originally posted by CamaroL32:
StudlyCamaro - When you said that you removed the front bar from your throttle body, what did you mean? I have spare one here that I might try to port on just needing some extra details. Thanks<hr></blockquote>

you have to take a dremel to the bar that holds the screws into the blade. and then after you completly remove the bar then you can put the blade back in. when its done it should look like this http://members.aol.com/_ht_a/atl2001...camaro/tb2.jpg

or if ya wanna buy one already done i have sone sitting right here

[98v6]

can you expect any gains just from getting the 99+ sensor? and does it fit our TBs witout modification, is computer tuning required, and will this solve all the problems associated with porting the TB?

[Magnus]

the 99+ sensor requires severe modification. the gains aren't from switchign sensors, its from porting the TB and removing all that middle stuff.

In reality, you can't port the pre 99 TB without using a 99+ MAF sensor.

[StudlyCamaro]

hey keith, can you split topics ? if so could you make one for the 3.4L TB posts (what this thread was about originally) and one for the 3.8L

[Magnus]

I cannot sorry.

DOH, i'm the one that threw this one off-base.. Sorry.

For those of you with 3.8 TB porting questions you need to start a thread for the 3.8.

[black34v6]

<blockquote>quote:</font><hr>Originally posted by Jerriko:
What were you planning on doing to increase the amount of fuel with this possible increase in air. Honestly, I think this is a waste of time of you. This is the weakest link in the chain effect. Have you done anything to the heads? Does it have an aftermarket cam? I know a lot of people will disagree with me but think about it. There is a certain point that you will reach before you have to start tearing into the block to get everything to work better. By porting the throttle body, you will increase the amount of air going in (in theory since your heads and plenum are still restricted). But the car still thinks that X amount of air is entering while maybe you increased X +2. Now you have a lean condition. I suppose you could bump up fuel pressure and lose some fuel mileage. Save your money for the head work and/or a cam.<hr></blockquote>


from someone who has a 3.4 and has ported his stock TB - this guy is right. you can port the TB all you want. and for those of you that will scream MAF problems, the 3.4 is speed density and gets its air reading from inside the intake manifold, so yes porting the TB will tell the comp to add more fuel.

but heres the tricky part, the air will not flow in at a rate that will be inductive to performance. cause the runners are tuned for a certain size, you increase the amount of air that gets forced into the runners, well..you will get a slight bump, but you wont get the full force of porting the TB - in addition to that, if you port it too big (like i did on my first one) you'll end up with air leaks and a high idle (i had 3000 rpm!).

if you port it enough you'll have to machine a new valve to sit in the bore..adn thats a pita. go with the removal of the front bar (aids in some hp...everything we are talkin about here tho is minimal, 1-3 hp maybe) and then worry about porting and polishing your heads and gasketmatching everything. once youve done that, then look into getting a larger TB. yes you can adapt the Y plenum to fit a LT1 TB - tiago has done it and so has matt - you can also get a larger single bore tb, up to 60mm from a company i believe is called FLP. (i could be wrong)

anyway..hope this helps.

-R

[LTNone]

Originally posted by Russell:
anyway..hope this helps.

I know this is old advice but it helps me a ton! I was wondering where the weak point in the induction system was. From this I believe it is the intake side of the heads.

[94TeaL]

I've done away with my plate too.. I got the idea from (aaron) studly..

[Brett Garret]

I'm runnin one of Aaron's p&p tbs. I didn't really notice a difference. I'm sure it helps at higher rpms or something, but I say whatever it is: it couldn't hurt. My gas milage hasn't changed and everything has run tip top. Hope this helps. -B

[whiteThunder]

how much did ya want for that throttle body?

[whiteThunder]

can someone explain how to cut that bar off, with a dremel, any special things i should be concerned with?

[Leviathan1994]

yeah, someone should post a how-to with some pics [img]smile.gif[/img]