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SAFC - Gray wire to boost sensor - 60% throttle?

Old 11-07-07, 11:53 AM
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SAFC - Gray wire to boost sensor - 60% throttle?

6port turbo SAFC problems...

okay so i had my SAFC hooked up with the SAFC Gray (Throttle%) wire going to Boost sensor - pin 2B (brown/red on ecu) and with the key turned on, it read 58-60%.. when i started the car - it would rev to 4k then want to die, and if it gave it any gas to keep it alive, it would shoot to 5k and continue to rev higher and higher, until id shut it off.

i switched the SAFC Gray (Throttle%) wire over to the TPS signal - pin 2G (green/red on ecu). so now it starts, wants to die, but i can keep it running its just super rough. and if u press the gas pedal the past 1/4 throttle it goes to 100% throttle on SAFC.

i want to hook it up to the boost sensor, but i dont know why it wont work right.
is there anything else i have to change when i do that?
can i hook the Blue wire up at the same point as the gray wire to monitor boost pressure voltage? ive read that - 15psi = 0v and +15psi = 5v

also
i have an FCD plugged into the Pressure Sensor (MAP sensor) on the passenger shock tower. would that be the problem?

also what HI / LO settings should i use for either of the two?

car barely runs and its super sputtery and rough.
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Old 11-13-07, 10:32 PM
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okay so i had my SAFC hooked up with the SAFC Gray (Throttle%) wire going to Boost sensor - pin 2B (brown/red on ecu) and with the key turned on, it read 58-60%
The SAFC measures a pre-determinded volt range which is from 0-5v. The "arrow" that you set is to tell the SAFC what the high voltage means, either hi throttle or low throttle.

If the boost sensor is putting out a voltage near 2.5v-3v, im going to guess the SAFC will calculate the percentage around 50-60%. Hook a volt meter up to the boost sensor wire and find out what the voltage is at.

Make sure you have the SAFC hooked up to the boost sensor BEFORE the FCD.

I don't know what the HI and LO settings should be when using load. I have heard a few people use the boost/pressure sensor with success, I just don't know what other changes to the settings they made.

i switched the SAFC Gray (Throttle%) wire over to the TPS signal - pin 2G (green/red on ecu). so now it starts, wants to die, but i can keep it running its just super rough. and if u press the gas pedal the past 1/4 throttle it goes to 100% throttle on SAFC.
You have all other settings correct right? The throttle percentage is correct if you have a S4. Its how mada designed the throttle sensing system. LO: 98, HI: 99

can i hook the Blue wire up at the same point as the gray wire to monitor boost pressure voltage? ive read that - 15psi = 0v and +15psi = 5v
You can monitor the voltage of the boost sensor in "sensor chk" if you have the gray wire hooked up to it. It will be under "throttle". I think the abbriviaion is THRTL or something.

You can hook the blue wire up to the the boost sensor and you will get the same voltage under "IN-2" in "sensor chk". There is no reason to do this unless you ahve the gray wire hooked up to the TPS.
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Old 11-13-07, 11:08 PM
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I had my SAFC reading boost very accuratly running it to the wire BEFOR my FCD. It would read a max of .86 bar which converts to 12.5 PSI just what my aftermarket gauge read. I never tried to hook it up to work off of the boost (blue) wire. But it should work if you get the AFC to read it right.
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Old 11-15-07, 11:02 AM
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boost (blue) wire
The blue wire is for a seporate AFM. Not for boost.

How where you monitoring the boost? Were you calculating the volts? Im glad you stepped in. Maybe you could clear a few things up on this area.
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Old 11-19-07, 06:08 PM
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No I was not calculating the volts. The reading on the AFC would read in vacuume and bar (kilapascles?) I really like it that way as it made a great boost gauge. Like i said I never made it adjust fuel by this but i think it can be done.
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Old 11-19-07, 06:14 PM
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Old 11-19-07, 07:26 PM
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What screen are you monitoring this in?

Since Throttle is monitored as a percentage and the sensor chk is in volts for the thorttle in IN-2.
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Old 11-24-07, 02:27 AM
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I just monitored it under the pressure section. the AFC just read the presure coming out of the sensor without any calibration.

As far as tuning I think I still used the throttle. 97 low 99 high

Sorry I cant be more helpful its been a while since I used my AFC. Rtek is much better.
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