Just curious what the advantage to having the TPS setting higher? I know stock is .54, and currently I have .55. I had it as high as .61 but threw a code, don't remember what one actually I think there were three. But what does this do for me. Thanks.

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87 GTA 350 L98
K&N filter, beefed up TH-700r4, Accel Manifold, Superram, Fuel Press. Regulator 49.5psi, air foil, modified MAF, SLP cold air box, Accel 24lb Injectors, Hypertech Thermomaster chip w/160 thermostat, MSD 6AL and Blaster 3, B&M shift kit & megashifter, Moser Ford 9in Rear with Richmond 3.50 and locker, Edlebrock TES headers and Cat Back,Gutted cat, removed emissions, Hotchkis setup in rear, Poly suspension and Koni in the front, relocated MAT, bypassed TB coolant

 

Nothing. People are under the misconception that they won't get the "full benefit" of WOT if their TPS max voltage is less than 4.5 volts. This is NOT TRUE. Anything over 4.0 volts will do it. Now that people are into buring their own eproms and have analyzed the code, we now know that "altering" the TPS to give a higher voltage does not really do anything (if the ecm is already sensing WOT).

And, in reality, your WOT is actually called PE (Power Enrichment) inside the eprom and you have COMPLETE control of when PE is invoked by altering the %TPS setting to invoke PE mode. If you set the %TPS in the eprom to invoke PE mode at 50%, then once the ecm senses 50% or more, the ecm will invoke PE mode...which IS what most people consider WOT.

Once PE Mode is invoked, the ecm addes extra spark advance and fuel over the other settings, and it ceases to use the O2 sensor to maintain 14.7:1. And the fact you have 3.8, 4.0 or 4.5 volts will not add a single HP more over and beyond what PE mode adds.

In fact, too much voltage @ WOT can trip a trouble code.

Now, making sure that your blades are fully open can make a difference in the amount of air flowing into the engine...but few ever check that.

 

I am one of those heading toward .6 or so for my TPS...I'm not going for any gains at WOT or anything...I have 'heard' that by going higher on the TPS eliminates the throttle lag that I have right now when I do a 'tip in' on the gas...it just flat out hesitates...did it from day one when I bought the car...and still does it...but not as bad. I do agree though that there is no WOT gains to doing this...

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GregF
87 IROC

 

GSF, what you are encountering is the need for a better eprom. Before DIY PROM burning became known, we TPI guys tried a lot of tricks, but it was mostly a "work around the ecm". The real solution was to get inside the ecm/eprom; we can do that now.

FYI, I run .56 at idle and 4.29 @ WOT. It's been like this since day one and I have never had to play with it. Now the eprom....that's a different story. I did a comparison of my current eprom to my original eprom and I have over 600 bytes of differences between them. I don't think there is a table that I haven't at least modified something.

 

The only thing I can see happening, is a quicker transition to WOT to get into the PE mode that Glenn mentioned above.

Can it benefit you? Maybe, depends on how fast you can press the accelerator pedal in the first place