tommyboy Posted September 12, 2007 Share Posted September 12, 2007 I have a 1981 N/A 280ZX and I am putting a 60mm 240SX throttle body on my stock intake. Well, I'm trying to adjust the throttle valve switch on it, but am unsure as to how I'm supposed to do it. Is it just like on the stock TPS, or what? Any help you could gimme would really help! Quote Link to comment Share on other sites More sharing options...
GrayZee Posted September 12, 2007 Share Posted September 12, 2007 Use a ohm-meter to test for continuity when the throttle is opened. Basically it should read 0 or (out of limits) at idle, and give a reading when the throttle is like... 100rpm above idle. Quote Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted September 12, 2007 Administrators Share Posted September 12, 2007 The stock 280 ZX TPS is a 2 position switch, (indicates closed throttle and WOT at approx ¾ throttle opening). I am pretty sure the 240-SX TPS is the rheostat style and as such would be incompatible with the OE 280-ZX ECU. You can verify this by using an OHM meter on the 240-SX TPS. If the resistance across the center pin and either of the other two pins changes resistance relatively linearly with throttle opening, it will not work with the OE 280-ZX ECU. If this is the case, you will need to adapt your 280-ZX TPS to your throttle valve. FWIW, the OE 280-ZX TPS should have continuity, (zero resistance), across the center pin and one of the other pins. Then as the throttle is cracked open, those two pins should immediately go to infinite resistance, (i.e. open circuit) and remain infinite at all other throttle positions. Then when the throttle is approx ¾ open through WOT, the center pin should have continuity with the other pin, (zero resistance). As the throttle is closed less than "¾ open", then these two pins should read infinite ohms, (open circuit). If you are using an aftermarket EFI system, the rheostat style TPS is what you need and all you need to do is follow the calibration instructions for that EFI system. Hope that helps, Paul Quote Link to comment Share on other sites More sharing options...
slownrusty Posted September 12, 2007 Share Posted September 12, 2007 The stock 280 ZX TPS is a 2 position switch, (indicates closed throttle and WOT at approx ¾ throttle opening). I am pretty sure the 240-SX TPS is the rheostat style and as such would be incompatible with the OE 280-ZX ECU. You can verify .... Thats the beauty of this swap...the KA TPS is 100% compatible with the stock L28E L28ET ECU, on other words both TPS' are 2 position switch designs. Yasin Quote Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted September 12, 2007 Administrators Share Posted September 12, 2007 Ah.. Thank you Yasin for clarifying that. Quote Link to comment Share on other sites More sharing options...
ktm Posted September 13, 2007 Share Posted September 13, 2007 Actually, the automatic KA TPS has both the rheostat and the 2 switch functions. Quote Link to comment Share on other sites More sharing options...
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