safc question

[sl2racer]

what are some possiable causes for a safc1 to only read a 97-98% wide open throttle. what i mean is when you are at 100% throttle it is only reading 98% and that is if i mash the throttle down.

for shits and giggles i turned the car on but no engine and went to the engine bay and used my hand to open the throttle up. just wanted to make sure it was actually going full throttle and it wasn't a worn throttle cable issue. non the less had the same effect.

also does it truly make a difference if it isn't reading those last 2 percent of wide open throttle since i can tell the throttle is actually 100 percent open?

[sc2grndsp]

well its just reading off of the tps signal..... so if anything its the tps that has the problem, not the safc?

[The Shaolin]

Mine did it a few times, but now reads properly? I dunno.

There's a "sensor check" option in the SAFC. It should show the voltages from the TPS. See what it's putting out.

[sl2racer]

i dunno what it is right this sec but i believe it is the correct voltage



have another question.

under slow to moderate increase of throttle i am showing vacum from the map. sometimes as much as -700

well if i am at idel and just mash the throttle it will actually read +60 to +100 mmhg.

can someone explain what is actually going on in the intake that is allowing for it reading pressure at that time rather than a vacum?

[S.Bretz]

That pressure reading is not accurate on our cars. Ignore it.

The TPS should be set to .5volts when the throttle is closed. Go to the sensor check window and see what is says. If its off by a little, then that could be why is reads off at WOT...but I wouldn't worry about it...as long as it goes over your high throttle trigger point to go into the high throttle map, your are fine.

[sl2racer]

at idel it reads0.4

at full throttle it is reading 4.1 so i guess it isn't getting a good signal or something

[JazzyJeff]

On the Teg my buddy just sold, the VAFC always maxxed out at 98% Throttle. The day before he sold i, I replaced the throttle cable on it b/c the other one snapped and it started reading 100%. It was just stretch in the original cable...

[sl2racer]

Re: safc question

what are some possiable causes for a safc1 to only read a 97-98% wide open throttle. what i mean is when you are at 100% throttle it is only reading 98% and that is if i mash the throttle down.

for shits and giggles i turned the car on but no engine and went to the engine bay and used my hand to open the throttle up. just wanted to make sure it was actually going full throttle and it wasn't a worn throttle cable issue. non the less had the same effect.

also does it truly make a difference if it isn't reading those last 2 percent of wide open throttle since i can tell the throttle is actually 100 percent open?

that is why i did it by hand to rule that out jeff.

[JazzyJeff]

Re: safc question

what are some possiable causes for a safc1 to only read a 97-98% wide open throttle. what i mean is when you are at 100% throttle it is only reading 98% and that is if i mash the throttle down.

for shits and giggles i turned the car on but no engine and went to the engine bay and used my hand to open the throttle up. just wanted to make sure it was actually going full throttle and it wasn't a worn throttle cable issue. non the less had the same effect.

also does it truly make a difference if it isn't reading those last 2 percent of wide open throttle since i can tell the throttle is actually 100 percent open?

that is why i did it by hand to rule that out jeff.

my bad. Didnt catch that. Honestly though, I wouldnt think youre losing much if it's at 98%.

[sl2racer]

i am not. like sam said it goes over the 50% throttle activation and it modifies my fuel curve as i see fit.

[S.Bretz]

should be around 4.8-5 volts at WOT. Readjust the tps and it should be the more better.

[sl2racer]

how do i do that?

[S.Bretz]

Back out both screws a few turns and then you can wiggle the TPS a little bit. When you get to .5 volts, tighten the screws back down.

Its alot easier to do this with the tbody off the intake. Those damned tps screws are a pita while the tb is attached.

[sl2racer]

will it make that much of a difference if i just leave it be. that is a pain in my ass. hahaha

[sl2racer]

well the n2o cleared up my throttle problem. i am guessing i must have still had some crap in where the tps sits. n2o cleaned it out and now it is reading 100%