TPS or tuning problem

[Icaruz]

ITR DC5, PRB kpro, kmanager 3.2.4. S2 70mm TB, K-Tuned V1 TPS, RDX 410cc injectors.

The problem is the 0-3% TPS area. It seems to be "missing". Driving in traffic with very light throttle is a real pain.

I'm trying to figure out if this could be a tuning problem or if it's a TPS / TB problem.

I made a quick datalog of the problem. The car is stationary, idle set to 950rpm. I can press the loud pedal to raise the RPM to 1500rpm and kpro still reads TPS 0%. Is this normal? Is the kpro datalog too inaccurate to show values below 1% and thus showing them as "0%"? Althought, raising the RPM to 1500rpm felt more like at least 2% TPS.

At WOT TPS shows 103%

The TPS is calibrated properly in kpro and otherwise the car works fine. Idle is fine also. I even got a new IAVC but that didn't change anything.

Help please! :)

[Hondata]

The ECU only has 1% resolution with the TPS, but it is possible that your TPS is non linear at low openings. Reset the calibration and see if it changes, otherwise the next step is to try another TPS.

[Icaruz]

The ECU only has 1% resolution with the TPS, but it is possible that your TPS is non linear at low openings. Reset the calibration and see if it changes, otherwise the next step is to try another TPS.

I did read the Min / Max TPS values several times before doing the datalog and the Min value only jumps around from 11.4% to 11.6% (if I remember correctly). But that's probably from the vibrations?
Anyway, I don't think I know what a non linear TPS is, but I will for sure try another TPS in the future, just trying to rule out kpro from the equation.

[Hondata]

A minimum of 11.4% indicates that the TPS is not aligned correctly. The wiper is probably near the end of the resistive track and the reading not consistent.

[Icaruz]

A minimum of 11.4% indicates that the TPS is not aligned correctly. The wiper is probably near the end of the resistive track and the reading not consistent.

Well that means that either the k-tuned TPS or the skunk2 TB is badly designed or the combination of the two isn't compatible. Neither is adjustable, so there is no way to change the minimum TPS as far as I know.

[Ahofnar]

I think you have the same problem that i had. Does your car go into a sort of seizure when trying to maintain the slightest bit of pedal pressure? Most notably, in traffic or in gears lower than 3rd? I have the BLOX 70mm TB, and what i noticed was that the butterfly wasnt perfectly formed. It was actually getting stuck when i let the pedal go, so it was jumping when i pressed the pedal lightly. The jerking came from the constant stuck-jumping motion. What i did was plugged the center hole inside the TB and set the screw so the butterfly was open slightly (not touching the housing). I went this route, because i didnt want to take the chance and sand too much off the butterfly valve. No problems since! Only one thing to note: those aftermarket TB's are so tight that 1% throttle is tough to maintain, so dont confuse a sticking valve with a super sensitive pedal. Hope this helps!

[Icaruz]

Today I modified the k-tuned V1 tps to have some manual adjustment. Basically I just drilled the fastening holes as much as I could. I got the minimum TPS down from 11.4% to 9.1% but it didn't seem to make any difference.

I think you have the same problem that i had. Does your car go into a sort of seizure when trying to maintain the slightest bit of pedal pressure? Most notably, in traffic or in gears lower than 3rd? I have the BLOX 70mm TB, and what i noticed was that the butterfly wasnt perfectly formed. It was actually getting stuck when i let the pedal go, so it was jumping when i pressed the pedal lightly. The jerking came from the constant stuck-jumping motion. What i did was plugged the center hole inside the TB and set the screw so the butterfly was open slightly (not touching the housing). I went this route, because i didnt want to take the chance and sand too much off the butterfly valve. No problems since! Only one thing to note: those aftermarket TB's are so tight that 1% throttle is tough to maintain, so dont confuse a sticking valve with a super sensitive pedal. Hope this helps!

This has crossed my mind for sure. My next step is to install my stock TB to see if that helps.

[viggen]

did you fix this problem?

[viggen]

yep i found my throttle cable slack to...when datalogging and looking at tps sensor.i tightened cable up to show 1% and then slackened it off a very small amount..been perfect ever since