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Here is what I found when I did my RB swap into my S13 (RIP). There is a wire thats suppose to go to ecu for the cold start signal. I'm sure it's the same on the SR20 too. Without the cold start signal the takes a little longer to turn over vs just turning right over right away.
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95 240sx RB20 415whp
91 Nx2000 VVL yo
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