Use spare tps for fuel trim?

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molecular bob
Posts: 35
Joined: Wed Feb 22, 2012 3:50 am
ECU Model: No ECU
Firmware Version: 31

Use spare tps for fuel trim?

Post by molecular bob »

As I have a spare tps, could i use this as a quick and dirty fuel trim control, wired via an analogue in? I want to dial in a fuel map for different sized injectors and fuel pressure? I have calculated a % change due to these changes, but was thinking of giving myself +/- 5% to play with to get the afr back to where it needs to be if the maths is wrong.

If the logic is sound, can you define the cells you trim in the software or is it global. I know i could do this in mapping, but a single rotary i can adjust on the fly would be useful to avoid having the laptop in the car.
Alex DTA
Posts: 1622
Joined: Fri Feb 28, 2014 1:03 pm
ECU Model: S40 Pro
Distributor: DTA
Firmware Version: 79

Re: Use spare tps for fuel trim?

Post by Alex DTA »

You can't use TPS2 for that.

You an use any of the analogues though. Pick one (TPS2 is on analogue 2 just to confuse things), fit a pot to it, then set the fuel adjustment you want for the range.
This is applied globally, so will do what you want to.
molecular bob
Posts: 35
Joined: Wed Feb 22, 2012 3:50 am
ECU Model: No ECU
Firmware Version: 31

Re: Use spare tps for fuel trim?

Post by molecular bob »

Cheers Alex,

should have looked at the wiring diagram before posting.
Rob Stevens
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Joined: Thu Jul 28, 2011 4:10 am
ECU Model: S100 Pro
Distributor: None-Coil On Plug :)

Re: Use spare tps for fuel trim?

Post by Rob Stevens »

Or better still build your self a knobs box. But you'd have to have the computer with you I guess.
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