Which throttle body to use? possible?

[tmota503]

Just wondering if i can switch these throttle bodies? will they be able to be plug and play or custom wiring?

oh yeah the reason i would like the throttle body on the right. is because it has a bigger inlet? for more air flow. right?

the one on the left is from a 1990 Mitsubishi Eclipse Gs-t.

not sure what car the other intake manifold came off of. its a 4g63 head though.

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[Speed_RacerGSX]

I don't recognize the one on the right, I don't see any reason it wouldn't work. The elbow looks like 1g though, and that should go away. More flow only makes a difference if its more everywhere, so intercooler piping needs to be the same or larger than the TB.

 

[tmota503]

I don't recognize the one on the right, I don't see any reason it wouldn't work. The elbow looks like 1g though, and that should go away. More flow only makes a difference if its more everywhere, so intercooler piping needs to be the same or larger than the TB.

but it has the cables on the side and more vacum lines?

 

[Absit]

The one on the left is not from a GST, it's from a non-turbo. If the one on the right has a larger inlet then it wasn't on a DSM.

 

[9!'clipseDOHC]

the one on the left is from a 1990 Mitsubishi Eclipse Gs-t.

not sure what car the other intake manifold came off of. its a 4g63 head though.

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You've got that backwards.

The one on the right is from a 1990 turbo like this one:

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1990 Eclipse

The one on the left is a 1g N/T like this one:

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1G Non Turbo Throttle Body

I would stick with the N/T TB.

 

[snowborder714]

And you don't want to use the '90 throttle body.

 

[tmota503]

snowborder714 may I ask why not to use that tb?

I probably will end up using the n/t tb, But how will I end up connecting the other plugs nd wires?
Would there be any soldering? will I need my old n/t harness?

 

[genONErider]

Hey before you buy the 90 GST throttle body, you're going to need to rewire a couple of those cables to fit in your 1Gb engine. From what I've heared the ISC motor is completely different on the 90-91 dsm.

I don't know if yours is broken or not. If you need to fix/mod but I dont suggest switching it. They're not compatible to N/A as far as I know.

 

[9!'clipseDOHC]

I probably will end up using the n/t tb, But how will I end up connecting the other plugs nd wires?
Would there be any soldering? will I need my old n/t harness?

Your profile says you have a '94 NT, is that not the case? A 91-94 turbo and non-turbo throttle body are interchangeable. You would need shorter bolts and a coupling (because there is no elbow) swapping from a turbo throttle body to a non-turbo throttle body.

 

[snowborder714]

The '90 throttle body is just a pain the butt. It's a one piece unit, where the '91-'94 units are two (FIAV and throttle body come apart). If you need to replace the shaft seals in the '90, they are two different sizes. It uses a proprietary ISC motor. And you need to use a '90 fuel rail with that throttle body, otherwise the rail will hit your '91-'94 piece.

 

[tmota503]

Oh i see. sorry for not updating my profile.
But I'm working on a swap.

my fifth gear cover got cracked. so all oil spilled and transmission went bad.

I found a 90 gs-t for 300. Everything is there just that the oil pump got a pen tip hole and oil got drained too.
Head, valves, springs and retainers are all ok.
as well as the pistions.

So i found a oil pump near by and added the shaft elimination kit. just needs everything to bolt back on. Don't have that much of the knowledge to do it myself. But for know I'm wondering what other small things i can do meanwhile everything is apart.
As the 90 Gs-t throttle body i would be replacing it with a 94 4G63 N/a throttle body.
What would i need to pull this off? Much better is it worth swapping it?

 

[LiquidX]

Out of the 2, as Nate said, the NT TB is the one you want. You may be needin to install some new seals I'd you want to hold boost on it though. I personally used a total of 4 #6 o rings (2 on Each end greased up).

 

[tmota503]

Alright cool. there doesn't have to be a sticky about this is there?

i know now from LiQuiDx that i need 4 #6 O rings. Other then that what i need or do for the extra cables that it has?

 

[LiquidX]

Alright cool. there doesn't have to be a sticky about this is there?

i know now from LiQuiDx that i need 4 #6 O rings. Other then that what i need or do for the extra cables that it has?

That's the amount "I" used. I'm sure just 2 will be fine, I wanted extra assurance as I couldn't find proper shaft seals (recommended) at the time.

What extra cables? You'll just change out your current TPS with the one in the TB.

 

[tmota503]

sorry no extra cables i guess its just plugs for the n/a harness?

Also I'm not familiar with some of these abbreviations. Is there somewhere on this site that i can look them up so when i don't know i look it up instead of asking.

 

[LiquidX]

The NT (non turbo) TB (throttle body) has 2 sensors. The ISC/ICS (Idle speed control) which is a 6 prong plug that attaches to the engine bay harness. It helps contol idle and all years have the same plug and same motor.

The other is the TPS (throttle position sensor) which is on the motor side of the TB shaft. It tells the ECU the percentage of throttle plate travel from 0-100%. You want to use year specific due to a difference in wiring. That also attaches to the engine bay harness. Any wires hanging off either are just cut pig tails.

The '90 TB however has a TPS sensor with an attached pig tail.

 

[9!'clipseDOHC]

There is also the IPS (Idle Position Switch) which tells the ECU when to idle. It has a single prong and is mounted above the ISC.

Here is a Tech Article on how so swap from a 1990 throttle body to a 1991-1994 throttle body: http://www.dsmtuners.com/forums/articles-intake-exhaust/301466-1990-swap-91-94-throttle-body.html and here are a few on how to change the 1991 to 1994 shaft seals: http://www.dsmtuners.com/forums/articles-intake-exhaust/245124-91-94-throttle-body-shaft-seal-replacement.html and Throttle Body O-Ring and TB Shaft Seals VFAQ.

Like Liquidx mentioned, it is recommended to use the seals over the o-rings. You can get the seals from JNZ, Extreme PSI or STM.

Throttle Body Shaft Seal Kit: 91-99 DSM & EVO 8/9 : JNZ Tuning
STM: MIL.SPEC THROTTLE BODY SHAFT SEALS | EVO VIII-IX | 91-99 DSM | 91-99 3000GT
EXTREME PSI : Your #1 Source for In Stock Performance Parts

Hope this helps!

 

[genONErider]

If it's true that you just need to get a different size bolts why not just replace the whole throttle body and cut/rewire the ISC sensor. Everything else should be a straight bolt on.

 

[NeMiZiS]

Is the a diagram showing how to wire the ISC?
Reading on this tech article, all it says is "Wire in the 91-94 connector for the TPS"
http://www.dsmtuners.com/forums/articles-intake-exhaust/301466-1990-swap-91-94-throttle-body.html