2G 1g swap in 2g

[Bubbadsm]

Hi there I’m in the middle of doing. 1g swap into a 2g. My question i need answer is do I have to switch to a 1g water pipe? And does the thermostat hook up to the water pipe?

 

[19Eclipse90]

The water pipe must match the thermostat housing you use.

If it’s a full 1G swap (i.e., including a 1G head), a 2G thermostat housing will not bolt up so it practically necessitates the use of a 1G water pipe.

Of course, it’s always possible to fab something up to make it work. But the most straightforward solution is the approach mentioned first.

 

[Bubbadsm]

The water pipe must match the thermostat housing you use.

If it’s a full 1G swap (i.e., including a 1G head), a 2G thermostat housing will not bolt up so it practically necessitates the use of a 1G water pipe.

Of course, it’s always possible to fab something up to make it work. But the most straightforward solution is the approach mentioned first.

So I would need a 1g water pipe? Does the water pipe or the radiator hose suppose to go it. I’m having troubles finding a diagram for it

 

[19Eclipse90]

1G Coolant Diagrams

N/T and 1991-1994 Turbo Diagrams

1990 Turbo Diagram

1G water pipe with a 1G thermostat housing. The pipe inlet attaches to the lower radiator hose.

 

[Bubbadsm]

Ok so I take it the thermostat goes here

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[19Eclipse90]

The thermostat housing, yes. The thermostat is in the lower half of the assembly.

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[Bubbadsm]

Thank you that helps a lot

 

[Justin DuBois]

Use your 2G sensors in the 1G T-Stat housing.

 

[Bubbadsm]

Use the sensors front the 2gen housing?

 

[Justin DuBois]

Use the sensors front the 2gen housing?

Yes! - You want the sensors in your car to match the ECU. 2G ECU = 2G sensors

 

[Bubbadsm]

I notice the flywheel has to be 6bolt does the clutch from my 99 have to changed out or no?

 

[19Eclipse90]

No. All factory turbo DSMs used the same clutch and pressure plate.

 

[Bubbadsm]

Does anyone know bout the 1g cas wiring or plug in play cas? I’m confused on how the wiring should be set up

 

[Justin DuBois]

RRE Instructions

What CAS sensor and ECU do you have?

 

[curt-s]

Yes! - You want the sensors in your car to match the ECU. 2G ECU = 2G sensors

Sort of. In the case of the coolant temp sender, it's matching the harness plug. I continued to use the same 1g sender in my '91 when I went to a 1995 ecu and it worked fine, which is kind of the opposite of a 6-bolt swap. I didn't have to switch it for a 2g style. They have the same voltage-temp ramp rate it seems.
When you're swapping a complete 6-bolt in, yeah, just get the 2g sensor so that you're not swapping harness plugs to use the old style.

 

[Bubbadsm]

Has anyone ran into the upper radiator hose leaking after doing the swap?

 

[jdxnc]

Has anyone ran into the upper radiator hose leaking after doing the swap?

Stock radiator? Leaking where exactly?

 

[curt-s]

If it's leaking at the rad, many people overtighten the clamp and crack the plastic.
If it's leaking at the upper tstat housing, your clamp is too loose or you have a hairline cut in the hose.
Your hose might also have a puncture/crack if it's got some age and has seen a thing or too.

 

[Justin DuBois]

Nothing swap related about a leak

 

[Bubbadsm]

Stock radiator? Leaking where exactly?

Upper radiator hoes

 

[Bubbadsm]

If it's leaking at the rad, many people overtighten the clamp and crack the plastic.
If it's leaking at the upper tstat housing, your clamp is too loose or you have a hairline cut in the hose.
Your hose might also have a puncture/crack if it's got some age and has seen a thing or too.

Tired new clamps and hoes. Just confused why it’s leaking at the housing

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[curt-s]

Is that the lowest point on the hose? It's not wet anywhere else under that hose except right where it slips over the upper housing neck?

Sometimes the leak can be a bit higher or further towards the rad and it travels down the underside of the hose until it starts dripping there

If you tried a different hose then I figure a hose leak isn't your problem (unless they both had a hole). It must be the clamp on the upper just isn't providing enough pressure. What type of clamp are you using?

 

[Bubbadsm]

That’s the only spot where the leak happens. Use screw claps and oem claps

 

[curt-s]

If the housing neck isn't cracked and the hose is dry underneath all the way to the rad, the only thing I can think of is switch to a t-bolt clamp and clean the neck of any debris/buildup.

 

[jdxnc]

The water necks are also very prone to pitting/corrosion, you can fill them in with some JB weld and put a new hose and new clamp on it.