2nd Generation Specific 1986-1992 Discussion

ECU question...

Old 10-27-2006, 12:09 PM
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right now i have a 91 coupe with JDM Turbo II. but it still has the NA ECU.

can the NA ecu's read boost? how bad is it for my car? oh, and can i use a S4 TII ecu? i cant find a S5 TII ecu yet.

thanks in advance
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Old 10-27-2006, 01:03 PM
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na ecu might read 2-3psi, not really no it doesnt see boost.

the turbo only see's boost to fuel cut, ~8.5-9psi

timing maps are different though, na is a little aggesssive for a turbo
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Old 10-27-2006, 03:13 PM
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i found a few s4 TII ecu's on ebay. how much of a difference does it make? i know the s4 TII had 8.5 CR and the s5 are 9.0, should i just baby my car until i find the s5 tII ecu?
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Old 10-27-2006, 04:13 PM
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The connectors are different , you won't be able to plug it unless you redo your harness, which is a pain... don't go there.
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