I am wanting to get the biggest TB I can. I will be getting a OBX intake manifold soon(accepts up to a 66mm). Where can I bet something that would even be close to that?

Modern Performance sells 60mm.

http://www.modernperformance.com/dcx/eclipse_60mm_mpxtb.shtml

It's shiney too so it'll match that OBX intake mani perfectly. :rolleyes

Nice Thankz.

Would that throttle body fit a stock intake manifold?

Originally posted by Urban_S
Nice Thankz. Would that throttle body fit a stock intake manifold?

You do realize of course that the "bigger is better" methodology is not the best route to take with these cars and, unless you're running a turbo, anything larger than a 57mm TB is actually going to lower your power output, right? You want to get as much air into your engine as possible, so you want that air to be going into the manifold as fast as possible, right? Well, if you blow as hard as you can into a soda straw, and then a length of garden hose, which one has the faster air coming out the other side? Exactly.

You can run the 60mm MP unit on the stock manifold, but you can't bore the stock mani out to 60mm without having to add material to the neck there or you will break through on the sides.

You can do whatever you want though. I bet the difference between a properly tuned throttle body and the biggest one you can find and cram on there is maybe no more than 3hp flywheel on your typical bpu'd 2GNT.

Welcome to the board.

Ding ding ding. Expert chimes in. I was hoping someone was going to mention that. :)

But it would be fine on the OBX right? I was just wondering.

Originally posted by Urban_S
But it would be fine on the OBX right? I was just wondering.

Do an Advanced Search and search for 'OBX' in thread titles only in the Performance and General forums. Enjoy.

Theres the Jeep TB too - thats a 60mm. Check my sig for a writeup.

You have plenty of options to go with on this. You could bore the stock TB out from 49 to make it 52mm(maybe 51). There are some aftermarket 55, 57, and 60mm TBs.

But I'll agree with these guys. Do some research on it before you jump in. There are alot of posts about experiences with various TB sizes on this board.

Good luck and welcome aboard.


95 Eclipse RS : 5 speed
15.7 @ 87.9mph
Jeep TB writeup - http://www.dimensia.com:81/jimbo/JeepTBfor2gnt.html

Originally posted by Urban_S
I am wanting to get the biggest TB I can. I will be getting a OBX intake manifold soon(accepts up to a 66mm). Where can I bet something that would even be close to that?

i'm selling a 60mm MP throttle body if you are interested

i thought that obx manifold only accepeted stock tb's? There was a thread on this & the guy who bought it said he had to port his tb outlet when he got a bigger tb b/c it accepted stock size.

Doesn't matter what size TB any manifold will accept. The simple fact is that, unless you have something like a turbo to ram massive amounts of air through the two bolt-ons, your air velocity is going to get progressively lower as the intake gets bigger and bigger. The engine can only suck so much air. It's just like when people install a 3" exhaust on a non-turbo or make their own custom CAIs and use piping too big. The velocity of the incoming air is lowered and power suffers as a result.

So I should probly be looking at getting a bored stock?

If I were you, yes. It all depends on your mods and plans for the near future man. You going turbo this fall? Then get the 60mm. If a turbo is still pretty much a dream at this time, then I wouldn't go more than 57mm and I'd do it as cheap as I could.

As for the manifold, pretty much everyone here thinks that intake manifold is more for show than go. Consider this:

You were thinking about a MP 60mm ($300) and OBX manifold ($250?). That's $550 imo.

Send your entire intake mani and TB (or buy a spare set and send them) to www.fierroracing.com He can bore out your stock TB to 55-57mm, match the intake mani to it, then port out the lower intake runners for a totally trick intake system (aside from CAI/shortRam). I'm not 100% sure on the prices right now, but I'm thinking he quoted me $75 to do the manifold and another $75 for the TB. So that's $150 for some serious mods that will yield gains whether your turbo or not. Then you check the sale wanted forum here or the DSMtrader and find yourself a GST rear section for $100 (to keep the math simple). Replace your cat with a cherry bomb style glass pack, and replace the straight piping on the rest of the system with some 2.5" pipe you buy in bulk, and now you've got everything except your CAI and header taken care of and you've spent $450 or less. Out of the money you would've spent on just a hogged out TB and manifold, you will have nearly built a complete NA intake/exhaust system and see some nice gains (nothing big, but noticeable nonetheless and certainly a smart step towards making the most of any engine mods like cams and timing).

If you can't tell, I'm all about pinching pennies here bro. I'm trying to have one of the most wicked all motor setups in the country (well, at least the most wicked one that runs reliably ;) cream420a ;) ). There are plenty of ways to throw money at your car. Wouldn't you rather get the most for your money? Especially when we're only talking maybe 10-15chp?

Take it easy.

EDIT:
The 2GNT head and intake manifold on Eddy's site are mine FYI. I practice what I preach imo.

fast fabricatiosn is working on a mass produced header that'll replace the cat 2.5" . 100 to be produced in about a month or two. I might get one and post dyno results maybe who knows..

I am glad I found this forum. I would love turbo but I just dont have the cash flow to get it(for now). So a cherry glasspack for my cat, a GST back cat, p&p TB and manifold. Sounds good.

Originally posted by Urban_S
I am glad I found this forum.

I say the same thing every day. This place is more like a family than a message board. Some very cool people here.

Originally posted by Urban_S
I would love turbo but I just dont have the cash flow to get it(for now).

Same boat. You will find you're not alone in this regard. Getting into turbo is kind of cost prohibitive to many of us. Of course, you might say you're unable to afford to install the turbo and wake up one day to realize you've put close to 5 grand into your engine and still don't have a snail under the hood. :P

Originally posted by Urban_S
So a cherry glasspack for my cat, a GST back cat, p&p TB and manifold. Sounds good.

Yup. Stretch that dollar bro. Stretch it. :P And like I said, these mods will make the most of anything you should do to the engine. Headwork will like it particularly imo. Stick around and have some fun.