Throttle Position Sensor

Hi Guys,

First post here, hoping that I can get some pointers in the right direction. I am coming to the end of my build, a VH45 swapped S13. For now I will just be running the Stock ECU with a Nistune chip, which I think is best suited for my budget and application.

The engine has a custom intake manifold made and uses an LS Throttle body. I am using this intake manifold over the factory one as it allows me to close the bonnet without any bonnet raisers.

Anyway my question is will the Nissan ECU read a standard GM TPS. From my research the Nissan TPS is 0.40-0.50 v at full closed and 4.2 v at WOT and the GM TPS is 0.5 V full closed and 4.5V at WOT.

1.) Can anyone verify these numbers sound correct?

2.) Can I bench test the TPS with a 5VDC Power supply or will this cook the TPS?

3.) Is it possible to add a small resistor to the TPS circuit to make the GM TPS read less than 0.5V at full closed? I believe the VH ECU is looking for 0.45 Volts for full closed position.

Hope someone can point me in the right direction.

Thanks in advance,

Brent

You can bench test with a 5 volt power supply. Make sure you have all the pin outs correct for both TPS's. Honestly I don't think it will make a huge difference if the voltage ranges are slightly off but I could be wrong. Before you go putting in a resistor and all that I would just drop it in and see how your throttle percentages look as you read the ECU.

Normally the biggest issue is that the ECU sees the correct voltage at closed throttle. Often this is used as part of the idle strategy. Fuel and ignition in VH45 is primarily derived from MAF, not the TPS so the TPS is mainly there for idle and transient enrichment.

I'm having difficulties finding the appropriate (aftermarket - sensor only) throttle position sensor that is the equivalent signal to the Stock LS (Corvette style top mount throttle pedal - Example equivalent part numbers : AC Delco 25835421, General Motors 12569599, General Motors 15864594, General Motors 25835421). I tired Haltech (US) technical support, Dorman technical support and Summit racing technical support. All seemed to hit dead ends or I simply had bad luck with the wrong people.. Here is my combination.

New GM LS3 (Gen4) crate engine. The ECU will be the (planned) Haltech Nexus R3 (and Haltech LS Harness). I have a stock GM corvette style throttle pedal (as described above) but I'm switching to the Tilton 600 series pedals (floor mount) which have the 8mm (D-shaped) throttle sensor bracket. The GM connector is the 6-pin Drive-by-wire.

If I were running the GM pedal, GM Harness and the GM computer, everything would plug and play. I get advice like - changing the throttle body? and adapters? I can't find anything that clearly states the signal standard for the rotating throttle position sensor that screws onto the Tilton throttle?? The Haltech support guy mentioned making sure that I have APP1 and APP2 signals. This seems to be what the 6-wire plugs are meant for.?

I seems like everyone using Wilwood or Tilton (style) racing pedals and an LS3 engine would have the same exact issue and this seems to be some sort of poorly documented mystery. I simply want what other's use and actually works.

Can anyone offer part numbers on position sensors that they have actually used? Thanks

I worked on a Ford Mustang (SCCA T2/AS) that had installed the Tilton pedals, but had to run the stock ECU -- which required the stock pedal. I just modified the pedal (cut it off), and bolted a plate to the stub of a pedal arm that was left. I then made a linkage with correctly sized belcranks from the Tilton throttle pedal to the Ford OEM pedal assembly. Was easy to adjust, and works fine.

Normally the Tilton pedal would be used with a stand-alone ECU with the flexibility to accomodate whatever pedal sensor you used. I have done that with a Tilton pedals, Penny & Giles pot that works with the Tilton pedals. The ECU was a MoTeC M150, and the engine was a GM crate engine (LS3 6.2L Hot Cam I think). Ran the stock GM throttle body.

Here is a sensor that works with the Tilton Pedals, and should be able to configure your Haltech ECU to work with:

https://johnreedracing.com/products/penny-and-giles-tps280dp-position-sensor