Can someone give me some info on this mod? Right now I've got it hooked to throttle and that obviously isn't gonna work.

 

Not exactly sure But i think you are refereing to hooking up the TPS singal wire to the boost sensor instead of the throttle since S4's have a narow range that reads 100 at around 1/2.

 

I'm confused as to why you'd hook up the blue wire to the TPS. It's there for skylines that use 2 MAF's. You can wire it into the stock o2 sensor and through the sensor check screen see the voltage your narrowband is putting out.

 

just did the fd UIM swap on my s5 and im sure i hooked uo the 4 wires to the tps correctly and my s-afc reads 100 at half throttle(before worked fine), so how excactly do i go about fixing this?

thanx

 

You're prob right. It's been a couple weeks since I hooked it up and I'm probably mixing my colors up. Tomorrow I'll pull up the carpet and check again. But yeah, I noticed that the throttle maxes to 100% when I only have the pedal like 15% down. I heard that the 'blue wire fix' is a way around it-or maybe it's hooking the TPS wire to the boost sensor like you said. Yeah, that makes more sense. I was hoping someone could give me some more info on that as I plan on getting this thing tuned pretty soon.

 

Look through the SAFC section, it's one of the very first posts ever created in that part of the forum.

 

Thanks.

 

you can still have it tuned with the tps the way it is. Chances are while your cruising and under little or no boost your fuel maps aren't off much from stock anyway it under boost and hard acceleration that you need the tunign for just set your low throttle setting at 98% and 99% for high. I seem to be able to maintain aout 90% throttel reading on the safc with s4 tps and cruise at 65 in 5th gear soo the low thottle fuel map would still be used for cruising and any time you hit 100% or about 1/2 or 1/3 on the s4 then the fuel map should become more aggressive (after tuning of course)

 

I thought the blue wire was an unused wire of the SAFC that you could splice into the O2 sensor wire of the ecu for an air/fuel reading.

 

That is correct. The blue wire is used on skylines which have 2 MAF's. With the blue wire tied into your stock o2 sensor you will be able to see the voltages it sends to the ecu.

 

Makes sense. I'll give that a shot.