LS240_sx

I have a LS1 from a 2000 Pontiac trans am swapped into my Nissan and I am having an issue with the TPS voltage range.

Completely closed idle voltage ~.503
WOT (fully opened by hand) 4.343
input voltage 5.03 volts

I have a drive by cable 95mm Holley efi throttle body and it will not physically open any more. I have read that my voltage for WOT should be somewhere around 4.65, how do I get my WOT voltage up another .3 volts? Is this something that can be done with tuning?

LS240_sx

Anyone?

G Atsma

If you are discussing operating voltages you have DRIVE BY WIRE.
Drive by cable means it is operated by a cable pulling it open, therefore there should be no issue getting full throttle since a cable is yanking it open.

LS240_sx

the cable pulls the blade open, the blade moves the TPS and the tps voltage is sent to the computer.

G Atsma

So you should be able to get WOT then. But TPS doesn't know about it....

LS240_sx

physically yes the TB reaches WOT, but electronically the TPS does not do the full voltage swing from .5 to 4.65

the_merv

iTrader: (88)

Reset the TPS or adjust the threshold in the tune for WOT.

Is the Throttle Body opening all the way where the mechanical stop hits?

LS240_sx

yes the TB is mechanically stopping. So the TPS can be adjusted in the tuning although it’s cable driven? I do not know much about tuning

NicD

iTrader: (7)

I guess I'm not seeing the issue here.

LS240_sx

The issue is I am not receiving a full WOT voltage reading on the tps. Wouldnt this be an issue even though the blade is opening fully?

G Atsma

I get the impression that the TPS is not calibrated correctly, to put it in a nutshell...

NicD

iTrader: (7)

Well you need to actually look at a scanner to see if it's reading 100% or not but those voltages you are seeing look normal to me.

LS240_sx

Would the PCM be able to read 100% if the TPS doesn’t send a voltage back within the WOT range?

LS240_sx

As far as I know it is calibrated correctly (mechanically that is). My readings show correct input and idle voltages but when I open the blade fully it will not reach what GM says is the WOT voltage.

minytrker

iTrader: (13)

If you have this TB https://www.holley.com/products/fuel.../parts/112-585 you can move the TPS on the side with 2 screws and get the voltage in any range you want pretty much. If your scanner is showing 0 tps at idle and 100% tps WOT then not sure what the issue is.

NicD

iTrader: (7)

You keep quoting a WOT range that I don't believe is accurate so you need to verify with a scan tool.

LS240_sx

ok I will check with a scanner when I get home