Sunbird GT turbo on an Optra/Reno/Forenza?`

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ChiPPy
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Sunbird GT turbo on an Optra/Reno/Forenza?`

Post by ChiPPy »

Has anyone been successful in using the turbo from a Sunbird GT, on one of the new 2.0l engines found in the Optra, Reno, and Forenza? I figured that seeing as the engines are from the same family, it should be something that could be done quite easily.
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PrecisionBoost
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Post by PrecisionBoost »

The Sunbird GT Turbo is an 8V head where as the Optra/Forenza/Reno/Optra5 are a 16V head.

As such the Sunbird 8V turbo manifold won't fit the 16V head.... I have both a C20GET (8V turbo) a T22SED (2.2L 16V) and a U20SED (2.0L 16V) so I've been comparing all the internal parts.

I have a 16V cast iron turbo manifold that will fit my Optra 5 on the way.... hopefully it will arrive in the next day or two (cross my fingers)

I got this through 360 Dynamics.... it's not exactly cheap but it should be an exact fit since it was designed specifically for this engine.

It has a T3 flange.... unlike the T25 on the Sunbird 8V turbo manifold.

I had my heart set on a GT28RS but since I'm going to be a "stage 1" test car I will be using low boost and won't be changing any internal parts.

If I ever change out the internals and fix up the engine I will probably design a tubular turbo manifold to fit a GT28RS.... but I have a feeling I will be happy with the "stage1" setup for a while..... especially if I build up the T22SED into a high powered engine.
kinkyllama
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Post by kinkyllama »

What PSI and how much HP are you hoping to get?
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04' Dropped Foreno
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ChiPPy
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Post by ChiPPy »

Once again, thanks for the info Erfinder.
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PrecisionBoost
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Post by PrecisionBoost »

kinkyllama wrote:What PSI and how much HP are you hoping to get?
If your talking about my Optra 5...... I was kicking around the idea of running about 4psi to start as I only have 7000km on the engine.... and then cranking it up to 7psi later on once I get a couple thousand more miles on the car.

A few very knowledgeable friends have told me I won't be happy with 4psi and that I should just go right to 7psi with stock internals.

I guess we will see.... I'm just going to throw on a used T3 on there to see how things fit and overcome any issues with the ECU being unhappy.
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