Thread: TPS sensor issues, fed up - Can i run without it? Options??

Essentially all you have to do to set ignition timing properly is to turn the CAS while using a timing light to make sure the crank reads the same timing the ECU is trying to give. So if you're idling and you know absolutely for sure the ECU is sending 15 degrees BTDC then you can turn the CAS until the crank pulley shows 15 and you're golden. Similarly if the ECU is sending 20 degrees BTDC then you turn the CAS so the crank pulley shows 20. This works at ANY number. If there were marks on the pulley for 50 degrees, you could set timing there and you'd be fine.

The only thing you need to do is make sure that the ECU is actually sending out what you think it is. Some sort of timing lock mode is best for this, but if you're sure that the ECU is not trimming the timing in some way (idle control will do it unless you turn it off as you mentioned, the ignition table will bounce around unless you set a whole swath of it to one number temporarily).

I need the tps voltage to rise rapidly with very little throttle movement and then taper off to the normal TPS scale. This would fix any issues.

let me try and give you an example :

stock TPS sensor
idle =0.45 volts
1/4 throttle=1.00 volts
1/2 throttle=2.00 volts
3/4 " =3.00 volts
WOT =4.00 volts

What I need the TPS to do now
idle =0.45 volts
1/4 =2.50 volts
1/2 =3.50 volts
3/4 =3.75 volts
WOT =4.00 volts

This is just a rough idea. I hope you get my problem now, caused my the massive throttle body

Sent from my iPhone using Tapatalk

I am seriously considering the new nemu2 but I'm still not seeing much of anything to help with my TPS issue. There are a bunch more TPS settings than the old tunercode but I'm not seeing anything that will help.

My issue is not max TPS voltage its the low side voltage. The only thing I seen was a fix for low reading TPS WOT voltage.

Even with a working TPS I don't see much of any TPS/accel enrichment because of the low TPS reading while taking off unless I go WOT.
I get enough/proper enrichment from the tune itself WITH THE TPS UNPLUGGED lol... thus better driveabilty.

If you can tune the tip-in enrichment tables, that is probably the proper solution...

I suggest getting the NEMU, i have zero driveability issues with my Q45 TB & TPS. Even when cruising I am at a very low TPS%, and it is so much easier to tune than a basic.

Is there any special tuning that you did in relation to the TPS? Q45 is 80mm and mine is 90mm. So you will be reading a bit more TPS% then me but not much. My main issue was to raise the overrun fuel cut as high as I could 5-6K from around 2K.


I understand the NEMU is realtime but ARE THERE ACTUALLY ANY GAINS with using the software for this issue over a BASIC tunercode setup

Can you back this up? I'm not finding much of anything in the DEMO beside the setting for a low reading WOT tps/%. Which is not really my issue. Its a low reading TPS at low/med load.

I think your drivability issue is because of all the other tuning parameters affected by throttle opening %, such as synchronous and asynchronous accel and decel parameters. The TPS parameters you may need to tune are "VOLTAGE PERCENT SCALAR", "OPEN TO CLOSED DELTA", and "CLOSED TO OPEN DELTA". NismotronicSA has all of these parameters, which where not included in TunerCode. Someone who has actually tuned with a large throttle body may be able to help you more than I.

Have you checked for vac leaks? I know it took a little while to get the car to idle and initial throttle opening correct but after that the car runs great. I doubt the difference between 84mm of the Q45 and your 90mm TB would make much of a difference. I would be more than willing to send you my tcd file if you get the nemu for you to inspect or try out different settings that I am using. I know I did play with the OPEN TO CLOSED DETLA and CLOSED TO OPEN DELTA, not sure about the VOLTAGE PERCENT SCALAR.

Ok thanks for the input! I'll hit you up if I get the realtime.

Did you have the same issue as mine? (hitting fuel cut/overrun fuel cut)

and what do you mean idle/throttle opening exactly?