2nd Generation Specific 1986-1992 Discussion

Viusal Differnses

Old 02-15-2005, 10:45 AM
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what are the visual differntis between s4 and s5 turbo motors ??? and what are the turbo numbers i have a ht18 is that s4 or s5 ?
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Old 02-15-2005, 11:11 AM
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both fc turbos are ht-18. the if you look at the manifold to turbo flange the s5 is square, and the s4 is all wierd.
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Old 02-15-2005, 02:30 PM
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waterpump is a good place to start, rad cap on the neck = s4, no rad cap on neck = s5.



unless pumps were switched.



kevin.
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Old 02-15-2005, 03:06 PM
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wires goint to your OMP pump s5 metal rod s4, 10blade clutch fa s5 i thin the other is 8 i think on the s4
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Old 02-15-2005, 04:13 PM
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AFM are clear giveaways between the 2 series of engines.



s4 uses an aluminium unit. the s5 uses that rubber-ish one.
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Old 02-15-2005, 05:38 PM
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the AFMs are rarely still attached
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Old 02-15-2005, 07:02 PM
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s4 has a smaller diamter TID. S5 has square plug injector clip things. s4 has aluminum thermostat housing, while s5 has plastic. s5 has plastic pipe that the stock bypass valve goes into while the s4 one is aluminum.
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Old 02-16-2005, 09:59 AM
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hummm ok well the neck has the rad cap on it but the flange to the manifold is rectanlge so what do i have a s4/s5
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Old 02-20-2005, 06:01 AM
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Old 02-21-2005, 03:41 PM
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check the tps.
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