Chi-Town Posted November 6, 2023 Report Share Posted November 6, 2023 Searched all over the place and the information I've found is mostly for the PFC. I don't want to deal with an external device for attessa. Because the link runs speed density the mafs don't matter and I can add the IAT so the wiring shouldn't be that bad. Has anyone done it? Does anyone make a jumper harness to make it simple? Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 6, 2023 Report Share Posted November 6, 2023 @Vaughan will probably give better specifics than me, but in the meantime since it is not immediately clear to me from your post, can you clarify: Are you putting an RB26 engine in a non-GTR chassis such as a GTS-4 or stagea, or do you have a GTR chassis but no engine loom? Quote Link to comment Share on other sites More sharing options...
Chi-Town Posted November 6, 2023 Author Report Share Posted November 6, 2023 Sorry for forgetting the details, Rb26 in a original S1 RB25det Stagea Quote Link to comment Share on other sites More sharing options...
Vaughan Posted November 6, 2023 Report Share Posted November 6, 2023 As far as I'm aware the only thing the engine needs to tell the attesa computer is the throttle position and the Link GTR plugin has a buffer for this inside it. A buffer circuit is required as the attessa computer pulls on the analog signal a lot and so will affect the reading if connected to it directly. If you aren't using the GTR plugin you will either require an external buffer or you will need to setup the ECU to transmit the TPS signal with a PWM aux output (which is what I did on my Stagea with a Grey plug pnp). If you are using a different throttle position sensor from factory with a different TPS voltage range (RB26 one is probably fine) then you need to use the PWM output style. I did find with mine that I needed a low pass filter on my PWM output and if I was to do it again I would use a spare Injector output which doesn't have any built in pullups and then add my own pullup to 5v. I would also consider putting a buffer on the PWM output. Then again next time I would probably just bypass the Attessa computer completely and control the 4wd pressure with a PDM directly. Quote Link to comment Share on other sites More sharing options...
Chi-Town Posted November 9, 2023 Author Report Share Posted November 9, 2023 @Vaughan yep that's why I want to run the blue plug link over the gray plug version. Question is what changes to the rb25det harness will I need besides IAT wiring for the blue plug unit. Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 10, 2023 Report Share Posted November 10, 2023 Vaughan has taken a couple of days off so he may not reply here until next week. I think he stuck with the grey plug loom in his stagea probably as that's just what it had. He knows the platform well though so I suspect he should be able to give a bit more info on how easy or difficult it is to fit a blue plug loom into one of those cars. Chi-Town 1 Quote Link to comment Share on other sites More sharing options...
Vaughan Posted November 19, 2023 Report Share Posted November 19, 2023 I've never looked into using a blue plug loom in the Stagea but theoretically it should just be a case of making sure that any connections between the blue plug loom and the body loom have the appropriate plugs and pinout. Quote Link to comment Share on other sites More sharing options...
Chi-Town Posted November 22, 2023 Author Report Share Posted November 22, 2023 @Vaughan I have a couple of 260RS (blue plug) engine/ECU looms but the connections to the car are extremely different than the standard RS-Four. I think I'll talk with wiring specialties to see if a patch cable is possible? Quote Link to comment Share on other sites More sharing options...
Vaughan Posted November 22, 2023 Report Share Posted November 22, 2023 The wires between EC and body loom in the plugs near the ECU according to my notes are: 111 orange/black aux5 -? big pin at end of clip in connector - fpcm? 119 purple/red na na small pin clip in connector, power light? 5 blue/white aux3 Tacho small pin clip connector 13 black/pink aux2 FP Relay small pin clip connector 17 red/white aux8 CE Light small pin clip connector 18 orange/black na na small pin clip connector 20 grey/red DI2 Start small pin clip connector 21 pink DI3 A/C Request small pin clip connector 22 black/white na DataLink Check small pin clip connector 27 white/red na na small pin clip connector and diode near ecu 28 LGreen na na small pin clip connector 29 yellow/green DI4 Vehicle Speed small pin clip connector 34 blue na 1 position signal small pin clip connector (auto) 35 pink/black na 2 position signal big pin clip connector (auto) 37 purple/white na throttle opening signal TPS OUT 1:1, needs buffer, non clip connector 38 LGreen/red na D position signal big pin clip connector (auto) 39 green/orange na Neutral signal small pin clip connector (auto) 40 red na R position signal big pin clip connector (auto) 58 white/blue na ouput shaft rotation speed small pin clip connector, sheathed wire (auto) 61 red/black na na non clip connector 64 brown/red na na small pin clip connector, power? 68 green/red na na small pin clip connector, OD light 69 LBlue na na small pin clip connector 70 green na na small pin clip connector, snow? 75 brown/yellow na datalink rx big pin clip connector 76 yellow na datalink tx big pin clip connector I also have some notes for the white and black plugs behind the coolant overflow in the engine bay: 106 LGreen/black aux1 na blackplug behind coolant overflow 113 pink na na pale plug behind coolant overflow 115 pink/blue na na black plug behind coolant overflow 120 yellow/green na na black plug behind coolant overflow 121 blue/red na na black plug behind coolant overflow 122 brown/yellow na na black plug behind coolant overflow 14 brown/white aux inj7 AC Clutch pale plug behind coolant overflow, responds to DI3 (AC request), turns off over 5000rpm and back on under 4200 24 green fan flyback?? ign sw??? pale plug behind coolant overflow 26 grey DI1 PS Switch pale plug behind coolant overflow 31 green main relay in ignition relay pale plug behind coolant overflow This was all from a S1 25X Four (RB25de Auto 4wd) before I proceeded to remove a bunch of the loom and fit a 30det. Important things would be: blue/white aux3 Tacho small pin clip connector 13 black/pink aux2 FP Relay small pin clip connector 17 red/white aux8 CE Light small pin clip connector grey/red DI2 Start small pin clip connector 21 pink DI3 A/C Request small pin clip connector 29 yellow/green DI4 Vehicle Speed small pin clip connector 37 purple/white na throttle opening signal TPS OUT 1:1, needs buffer, non clip connector 14 brown/white aux inj7 AC Clutch pale plug behind coolant overflow, responds to DI3 (AC request), turns off over 5000rpm and back on under 4200 26 grey DI1 PS Switch pale plug behind coolant overflow 31 green main relay in ignition relay pale plug behind coolant overflow Chi-Town 1 Quote Link to comment Share on other sites More sharing options...
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