So I installed TII intakes on my NA block and I don't want to bother buying a TII TPS if all it'll affect is drivability and gas mileage. I've driven the car with no TPS and it drives fine, I can deal with the poor drivability. My only concern is that one of the plungers is an input to the ECU for OMP operation. When the TPS is disconnected, does it go into a fail-safe mode or what? Is it safe to run it hard this way?

 

My car seemed to drive fine without a TPS. Getting one will make a night and day difference.

do expect it to run super lean and super rich, afterburn like crazy, and with the lean-ness you may damage the engine if you're driving hard.

It's worth buying one, or finding one on the forsale section. they usually aren't so expensive(<50).

 

We know that the full range TPS is used to determine OMP delivery. Here is some information about the FD TPS and its failure modes:



full signal is around 4.2-4.5 volts from the full range TPS, 0 volts is 0% throttle reading. you need to make the decision whether you are comfortable in fail-safe mode given your setup.

 

That just reissues my message!
don't skimp
a 50 dollar part
is better than a 1500 dollar rebuild.

 

I'd also suggest buying one, or simply adapting your NA TPS. The only difference between an NA & TII TPS is the mounting bracket.

 

His car's a S5, so he's got the dual plunger set up like mine, don't the turbo ones only have a single?

 

S5s all use a double plunger setup w/ narrow and full range.

S4s just use one plunger.

 

roger roger, thanks for the enlightenment!

 

LOL Are you kidding me? A bad TPS is NEVER going to cause an engine to blow. I have a wideband and I've ran with and without the TPS plugged in (NA-T setup) and saw NO difference in WOT AFRs. And its not a $50 part, I don't want to buy a used one that is crap. Also a rebuild does not cost $1500, not even close. Please only reply if you have knowledge of how the ECU actually works, nothing personal.

ANYWAY, assuming I understand the FD setup correctly, fail safe mode = 5% idle and 25% anything else which is fine with me. And the plungers on the TII TPS are angled (from the advance auto pictures) so there is no way I can use the NA one. I guess I could cut it and bend it...I'll have to consider that, thanks for the help.

 

Ive come to understand that on non speed-density systems the TPS is mostly used for quick a quick rich when you stomp it, and quick lean when you go into decel. Sure your WOT A/F should be fine, but will you lose out on throttle response?