1G TB WTF?

[jiul]

So I am trying to get info about swaping the TB to the 1G one for it is written that that is the way to better performance.
I find this tutorial on it and the guy is getting all into it with his Dremel and his Ohmeter.
Now I haven't seen any of this mentioned on these boards is it something that we have to do or is it optional just to kill an afternoon?

http://www.roadraceengineering.com/2gtbswap.htm

[grasshopper]

You have to port the intake manifold opening to match the TB in order for the swap to be worthwhile. Whether the 7G mani actually needs to be ported at all, someone else should know better than me, 'cos mine came with a 60mm TB. 8)

The 1G TPS is a three wire with an external closed throttle switch, the 2G and 7G use a 4pin TPS with the switch integrated, so that needs to be swapped. And, whenever (re)moving the TPS you have to calibrate it thus the need for the ohmeter.

[bradley1997]

I know a while back a few people did this. Rob was one that wrote a tutorial a while ago but I haven't seen him on here in ages. It seemed like way more work than it was worth to me. I would rather just port the existing tb, I think they can get it to like 57mm.

[jiul]

I know a while back a few people did this. Rob was one that wrote a tutorial a while ago but I haven't seen him on here in ages. It seemed like way more work than it was worth to me. I would rather just port the existing tb, I think they can get it to like 57mm.

Really that would be something to look into? So who are this "they" and how much do "they" charge?

[seth98esT]

They = anyone with a dremel.

[jiul]

They = anyone with a dremel.

LOL I got a Rotozip can can I join in? So how do I know how much to shave off?

[DOHCstunr]

you just buy a 1g n/a thottle body gasket. hang it in place with the throtle bolts. use a felt tipped pen or sharpie top trace the inner diameter of the gasket.

then you stuff a sock in the intake manifold. while holding a shop vac close to where you are grinding, you just remove the material until the hole is matched to the gasket. and you are done.

60mm 1g throttlebody. cheaper. better than a 57mm.

[jiul]

you just buy a 1g n/a thottle body gasket. hang it in place with the throtle bolts. use a felt tipped pen or sharpie top trace the inner diameter of the gasket.

then you stuff a sock in the intake manifold. while holding a shop vac close to where you are grinding, you just remove the material until the hole is matched to the gasket. and you are done.

60mm 1g throttlebody. cheaper. better than a 57mm.

1g from a 1.8 or 2.0 ?( I think there are two right?)
How is buying one chaper than grinding the one you have?
What about the Ohmmeter trick?

[seth98esT]

Its a bit harder to port your existing TB then to port a few mm on the intake manifold. You would have to port both the manifold and the tb if you were to stay stock.

I used a 1g N/A throttle body and had no problems. Just had to block off a section on the underside of the tb so coolant wouldnt flow in. Either that or just bypass the tb of coolant.

[DOHCstunr]

if you port the throttle body you have, you have to make sure the bore is a perfect circle. then, you have to make a new throttle plate that is oversized. again. perfectly circular.
it is NOT somthing you can do yourself w/o the proper machines

you are looking to pay at least 150 bucks for a ported 56mm throttle body w/ your core.
now if you put the ported throttle body on, you would still have to port match your manifold.


:arrow: you can snag a 1g non turbo throttlebody for under 50 bucks and be done.

and if you wanted to. you could sent it off to get bored out to 63mm

what about a ohm's?

you use the ohm meter setting on a multimeter to set the thottle position sensor to spec when you move your tps to the new throttle body

[98ACR]

<div class='quotetop'>QUOTE(DOHCSTUNR)</div><div class='quotemain'>if you port the throttle body you have, you have to make sure the bore is a perfect circle. Â*then, you have to make a new throttle plate that is oversized. Â*again. Â*perfectly circular.
</div>

actually...no. The throttle plate is not a circle, it is ever so slightly ovoid. This is done by the factory to keep the throttle plate from getting jammed shut if it's let to snap closed. Most places that bore TBs don't reprodcue this ovoid curve and as a result bored throttle bodies tend to stick when you let them snap shut. Just a little factoid.

The 60mm TB you need is off a 1g 2.0L (use one off a turbo car if you have or plan on going turbo, use a N/T one if you have a N/A car. The N/A one bolts up perfectly, the turbo one requires custom piping) Just be sure you get a '91+ (not completely sure on the year, but I know '91+ is safe) Two-piece TB, the very early ones are one piece and will not work. You than block off half of the coolant passage with RTV, bolt up the Galant IAC unit, and it's good to go.

And yes, there is a substantial difference in the inlet size between the 4g64 intake manifold and the 4g63 intake manifold. THe difference between the two TBs sizes to be exact...8mm (it's more than you might think, and a world of difference if you have modifications to make use of the extra airflow)

I have two of them ready to go right now if someone wants one but is scared to cobble it together themselves. PM me if intrested.

[DOHCstunr]

as i am not in the practive of machining throtle bodies i wan't trying to make a flawless statement. just trying to emphasise that a dremel or sandpaper will not yield desirable results, thus the need to have it proffessionally done. given that, it was my intention to highlight the ease of which a 91-94 n/a throttle body could be obtained and installed; and that it was the better choice between the 2. which was the original point of my reply.

[Blue Ice]

ok, i trook my throttle body off my jdm 6bolt 63t, is it possible that it coule be 63 mm already? I also had a question about the injectors... blue top = 450cc?, What cc are the yellow top?

[DOHCstunr]

lets see a pic of your throttle body. most likely its going to be a 90 style throttle body and you won't be abnle to use it. it won't be 63mm but its definatly going to be 60mm.

hopefully you got the right tps and iac on it.

if the tps has a connectors thats on a length of wire, then you will need to get a different tb. you can get cheap 1g 91-94 tb's for under 50 bux on ebay.

[seth98esT]

ok, i trook my throttle body off my jdm 6bolt 63t, is it possible that it coule be 63 mm already? I also had a question about the injectors... blue top = 450cc?, What cc are the yellow top?

510cc = Yellow.

[Blue Ice]

My cyclone throttle body

[ChikagoGTZ]

Dude, when I'm in Kansas I have to see your car!

[DOHCstunr]

ah looks like you didn't get a 90 model motor.
thats a 91-94 style throttle body.
your iac and tps are setup the good way, so no need for throttle body mods.

can you take a pic of your oil filter housing? gimme the view from the timing belt side of the motor. i need to see something.

also, lets see the pic of your turbo compressor wheel. cause since you have yellowtop injectors, and a cyclone manni that says eci multi, instead of cyclone, i think you have a big 16g turbo, or at least a small 16g.

[Blue Ice]

No man , i got blue top injectors, and the intake does say cyclone turbo intercooler on it,and i looked it up when i forst got it, but i'm sure it's a 14b, but i'll take the pics any way for you.

[DOHCstunr]

No man , i got blue top injectors, and the intake does say cyclone turbo intercooler on it,and i looked it up when i forst got it, but i'm sure it's a 14b, but i'll take the pics any way for you.

yeah blue top and cyclone is a 14b.

just snap me a pic of the filter housing. i gotta see something