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| RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections. |
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| RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections. |
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05-15-2012, 07:47 AM
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#1 |
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Rotary & Boost Addict
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Question for the Gurus
I have what seems to be a turbo mani off of a Jspec S4 engine. I got it from my friend who thought it was a USDM as it is going on my S4 turbo USDM engine. Noticed some differences and wanted to know if it can still be used on my engine. Differences I have noticed between the 2...mine has a small port while the other does not. No bolt holes for mounting the exhaust valve actuator in stock location (as mine) on new manifold. Exhaust valve door rod in manifold clocked in diff positions on both manifolds. All help is appreciated....
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 '05 Copper 6s, '87 TII RX7...248whp & 224wtq @ 12lbs |
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05-18-2012, 03:08 AM
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RCC Addict
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Yes, the J-spec S4 twin scroll is backwards versus the US-spec system.
This is due to the RHD steering column snaking it's way next to the turbo on that side of the engine bay. We usually yank the twin-scroll and plug the actuator hole with an NPT plug. The twin-scroll gets in the way, and the turbo flows better with it removed. -Ted
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reted_2000@yahoo.com Technical Advisor FC3S Pro http://fc3spro.com/ Quote:
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