TPS Mod on Ebay??

[Mr Nice Guy]

I just saw this and was curious if these work? If so how much do they really help? My guess is not that much but I haven't really seen one of these before. Anyone know? Any info is greatly apreciated......Thanks .......Later

[mmcgehee9989]

What kind of mod TPS exactly. Just a different sensor or what?

[Mr Nice Guy]

Opps forgot the link here ya go http://cgi.ebay.com/ebaymotors/ws/eB...tem=2470948569

[mmcgehee9989]

It seems to trick the ecm by staying ahead of the throttle so you get better throttle response, but how this produces power is beyond me.

[Mr Nice Guy]

Yeah I can't figure it out either.......Maybe someone else knows or maybe he's just selling snake oil.

[mmcgehee9989]

Doesnt the TPS just tell the ECM what position the throttle is in, hence the "throttle position sensor". Or does it do something besides this. Maybe wolfman or the other members know. I notice they make alot post and seem to know what they are talking about.

[TruckMuddr]

I gotta call BS, and this is why"

"A stock 1998 Camaro Z28 when tested WITHOUT this device, at 50% throttle, produced 50 FTLBS of torque @ 2500 RPM. When tested on same vehicle WITH our TPS Enhancement Module, at 50% throttle, produced 250 FTLBS of torque @ 2500 RPM. THAT'S A 200 FTLBS OF TORQUE INCREASE OVER STOCK @ 2500 RPM!!!*

*Results based on stock 1998 Chevrolet Camaro Z28. Your results may vary. Please note that the condition of your vehicle will greatly influence the performance increase seen when using our TPS Enhancement Module
"

Now I can't see that doing that!!!!

Maybe I'm wrong

[Injuneer]

In general, this is useless. The throttle position input is critical to the PCM repsonding to throttle movement, and in the way it selects the enriched A/F ratio for "power enrichment" (PE) mode. In effect, the PCM monitors the TPS signal for movement, AND rate of movement. If it is opening rapidly, it quickly increase the "target" air/fuel ratio to anticipate the rapid increase in air flowing into the engine. This is the exact same function that was served by the "accelerator pump" on a carburetor.

When the PCM sees very rapid movement, it richens the target A/F ratio. Whether this helps you depends on how well the factory programmed the "PE" mode. In the 3rd Gen TPI engines, they were generally programmed on the "lean" side, so anything that might richen the mixture a little would help.... as would be the case for the "TPS enhancer" or whatever they chose to call it.

On an LT1, the PE mode target A/F ratio in the stock programming is already way too rich, so the last thing you would want to do on an LT1 would be to use on of these gizmos. It would only make it run even richer for a brief period, and that is the last thing you want.

With the LS1's, GM seemed to get the PE programming correct... not too rich, not too lean. The "test data" they gave makes little sense at all. In effect, they appear to be comparing the engine torque produced at "cruise" where there is very little throttle movement, and very little need for engine torque, with a case where the throttle was moving, and that movement was "enhanced" by the device to make it appeat the engine was under load..... this is sort of like takeing a dyno result with the engine at steady state (low torque production) and another with the throttle on the floor (high torque output).... and the two cases are in no way related to each other. You could have achieved the exact same effect by putting the throttle on the floor. Let's face it, how long does it take to move the throttle from full closed to full open?

My reocmmendation would be to save the $65 for something that works.

[Joe 1320]

Originally posted by Injuneer
My reocmmendation would be to save the $65 for something that works.

I second that. They cause nothing but problems on our cars. The only benefit appears to be for turbo applications.