GenVibe - Community for Pontiac Vibe Enthusiasts

What size is the stock TB? My gf has a 04 vibe non-gt and non-supercharged. Also, do the GT's or the Supercharged vibes have a bigger TB? If, so ... is it a direct swap (assuming that all of the sensors will hook up)dan

Ohh, also I forgot to add. Im not looking for a 90+mm TB ... beacuse that would just be a waste of time/money since there are no plans for boost ... yet dan

Never mind ... I found the info. And I had NO idea that the Vibes had such a huge bored ... DAMN! Base vibe is 79mm bore and the GT is 82mm bore. Now, will the GT TB be a direct hook up to the Base model?dan

where did you find that about the TB? I found a guy to port/bore the stock one from 54mm to 60mm.

what kind of benefit does a larger TB have unless the intake manifold is ported to take advantage of it? I would imagine that restriction is restriction, regardless of whether or not it's before or after the butterfly valve.Am I wrong?

A ported TB will allot more air flow into the intake through out the entire rpm range. You'll notice slight gains with just TB ported but if you do the intake as well then it would be even more. I was going to get both ported but im going SC so i decided not to get my intake manifold done and save the money for the SC

Well, if you're going to forced induction, I can wholly understand bypassing the boring of the intake manifold, but if you're keeping the car NA, I would imagine that it is a great way to increase performance.I still don't understand, though, how having a big TB sitting right over the restrictive manifold opening is going to help. That means there is still a restriction of about the same size diameter as the piece that was just bored.Think about it this way:You have a garden hose at 1 inch diameter with a funnel on the end. You modify the funnel so that it spills into a 5 inch pipe. But, 5 feet away, an adapter takes it right back down to a 1 inch hose. Would there be a better flow of water out the far end of the 1 inch hose, or would that flow be the same? If I understand hydrodynamics in the least, I imagine that there would be no change in the flow of water out of the far end of the hose.I don't think there is much of a benefit. BUT, if the 1 inch hose is replaced with 5 inch pipe from stem to stern, the increase in flow would be dramatically improved.So I will argue that a bored TB is not going to amount to much without a bored intake manifold, and even then, won't be maximised without a ported head.

yea im not wanting to stay NA i need the force!i see what your saying, but do we really know how big the intake manifold hole is? thats the question. I think the TB is smaller than the intake manifold anyway BUT the guy from maxbore.com that does the TB boring will also bore the intake on the manifold to match your TB if you would like. But having the IM fully ported is where all the power will lie. I agree if i was staying NA id do both.

Also depends on the shape of the TB. If there are a ton of rough castings and they are removed it can help to smooth things out. I doubt you will feel any increase and when I did this before to another car I did pick up a little but not enough to feel. Obviously this is just porting out one not going to a whole new size.

oh snaps i just realized yea the inside middle of the TB is smaller than the outer diameter, so boring is sweetness. here i can get a thread but its from 9thgencorolla.com and you might need to be a member. From people that have done it, you can feel a slight increase, which is why i got a extra TB to get bored out, i need powa!EDIT: here ya gohttp://www.9thgencorolla.com/f...+body

http://www.internetautoguide.c....htmlI could be wrong, but then again ... I have known to be wrong. I was kinda thinking the same thing with the cavalier engine (in ragards to the similar equasion) But, then again ... I highly doubt that it is 70+mm since it is a 4banger. The reason why I am looking for a bigger TB is because if you increase air flow, you will get a little bit better performance and possibly increase in the gas mileage. I do know that on the cavalier's (not too sure about the vibes) but if you are going over 60+mm TB you are pretty much setting up yourself up for boost. Going over the stock mm (probably 4 over) you will get a bit more torque, which will lead up to your engine reving up faster.So, will the GT TB be a direct swap. I can only assume that it is bigger, since it more of the "performance" end of the vibes.dan