1990 HG Galant throttle body questions.

Hey everyone, longtime reader, first time poster. I have been extraordinarily lucky in my vehicular endeavors recently. I managed to aquire basically my dream car for only $2500. It's a 1985 Mitsubishi Cordia GSR, 1G 4G63 DOHC 2L turbo swap from a HG Galant, front-mount cooler, Microtech LTX-8 ECU, retrimmed interior, Ford Blood Orange, its beautiful. But...it also makes 45hp, at the wheels.

That's not a typo. The guy who put it on the dyno said it's running way too rich and the timing is so far out it's hilarious. But before i can get a tune done, i need to replace the throttle body i broke. I over-tightened the idle control switch and broke the thread off the side of the TB. Finding one of these TB, especially off the 1990 HG Galant with the built-in unremoveable FIAV, is basically impossible. I've searched online and every wreckers i can find within 300km, and after speaking with the guy up at a local performance shop who himself loves and specializes in the 4G63, he recommended getting an aftermarket replacement.

After some research i stumbled accross the S90 Pro TB: https://www.ebay.com.au/itm/S90-Racin...L/222035326280

Now given my engine is the Cyclone intake with the 60mm TB, should this one bolt straight on? I can't take the FIAV off my current one so i've been told getting a deletion plate to remove it completely is ideal. It wasn't plugged in anyway thanks likely to the aftermarket ECU. Does this sound right? And if so, where can i get one of these plates to suit that S90 TB?

My current idle adjusting screw thingy (serious WTF is it called) that no longer screws into the side of the throttle body had a little tag on the end for a wire that went back into the firewall. I assume this was some sort of closed-throttle sensor for the ECU. This new one i'm looking to get doesn't have that is that ok?

There was some sort of vacuum hose connected to the top of the old TB, but i can't see that same connection for the new one. Is that an issue?

With this new TB installed, does the ECU need a retune or should it work well as a simple bolt-on replacement?

Prepare for incoming car porn pics. Some of these you may want to hide your children or those sensitive to awful power curves and glowing headers. Enjoy!

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what is " the built-in unremoveable FIAV,"

i have a spare TN 2.6 efi T/B

or you might be chasing one off a TR

Quote:

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Originally Posted by magna buff

what is " the built-in unremoveable FIAV,"

i have a spare TN 2.6 efi T/B

or you might be chasing one off a TR

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Fixed Idle Air Valve?

So the bit that can't be mounted is MD166235 Throttle body idle switch which would tell the ECU the throttle is in the idle position. ANy marking s of stamps on the TB casing like AC60-xxx? WHat is this from again? HG Galant VR4 aust delivered or import? Is there a picture if the FIAV in one of your photos?

Quote:

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Originally Posted by TW2005

Fixed Idle Air Valve?

So the bit that can't be mounted is MD166235 Throttle body idle switch which would tell the ECU the throttle is in the idle position. ANy marking s of stamps on the TB casing like AC60-xxx? WHat is this from again? HG Galant VR4 aust delivered or import? Is there a picture if the FIAV in one of your photos?

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LOL. Fast Idle Air Valve. The wax pellet assembly at the base of the TB. Image is an example off a lancer
https://thumbs.ebaystatic.com/images/...lqE/s-l225.jpg

on that pocket rocket looks like any thing but metal might melt

yep toss the wax pallet :io:

A lot of this is beyond my experience but example of the blanking plates.

https://www.meek.com.au/galant-vr4-4g...alant-vr4.html

https://www.galantvr4.org/ubbthreads/...page=0&fpart=1

https://www.galantvr4.org/ubbthreads/...2&Main=1201593

My understanding of the FIAV is it's a temp controlled fast idle for cold starts.

Eclipse Turbo ?

https://www.throttlebodys.com/1990.htm

https://www.throttlebodys.com/1G%20Turbo%20TBs.htm

OK - You can use a TR/TS throttle body as it is the same diameter and bolts on but also allows for a much larger diameter hose and pipe to be attached as opposed to the VR-4 which has a fixed elbow which is smaller. As for the idle switch, swapping over a four pin TPS from a TR/TS Magna and running a jumper wire from the extra pin on the TPS to the throttle closed switch will do the same job. The CC GSR/Evo/TR onwards Magna TPS have four pins with an inbuilt throttle closed switch while the VR-4 has a separate switch which also acts like a throttle stop which is vital that it is adjusted properly.

If you get stuck and want a VR-4 throttle body I have one in bits but it's in NZ and I wont be going there until early March.