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Old 12-24-2004, 11:21 AM   #1
damn_4eat
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Default Fooling the TPS

Hey Guys,

The ZEX N2O kit likes to arm itself @ 90% throttle (this is not verified)
as some of you may know that the control unit for the ZEX kit wires directly to the TPS.

I'd like to launch my car on N2O so the question is that is there a way to "fool" the unit into thinking that the car is @ 90% throttle when the reality is that it may be @ 50%?

Sorry for the stupid question but this boggles my mind....

Thanks in advance...
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Old 12-24-2004, 02:40 PM   #2
ride5000
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why don't you just floor it once the clutch is let out and the car is launching?

i wonder why you need nitrous flowing while the car is stopped...
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Old 12-24-2004, 02:44 PM   #3
DDMan
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Not a good idea. Unless the car is at WOT, you wont be getting the correct fuel map. I'm pretty sure the ZEX kit is a wet kit (not sure how it does it), but I DO know that you should NOT fire (set off) nitrous unless you are at WOT (its a safety issue). You can run the car lean and kiss the engine goodbye (of course, not a common occurance, but its possible).

With AWD, we can get a good, hard launch. Although we do have extra traction to spare, I would not suggest using it on a launch. Arm the system when you are staging, then launch, and once you are at WOT, the nitrous will kick in automatically. It will also turn off automatically when you back off the throttle at the end.
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Old 12-24-2004, 04:51 PM   #4
damn_4eat
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Quote:
Originally Posted by ride5000
why don't you just floor it once the clutch is let out and the car is launching?

i wonder why you need nitrous flowing while the car is stopped...

oh, sorry i forgot to mention, I have an auto trans with a highstall t/c.
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Old 12-28-2004, 10:04 PM   #5
xFactor
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It's easy. Reprogram the tps set-up. Instead of WOT, go half-way, or wherever you want. While in programming mode, the unit looks for the highest recorded voltage. Most tps's max out voltage slightly before they hit the mechanical stop. That's the reason for the 90% activation on some cars, they all have different tolerances.

If the ecu sees 55ish% tps, then it flips to open-loop. I would highly suggest being there (open-loop) when programming your activation point. You can verify all of this with an OBDII scan tool, it's invaluable.

Anyway, here are the programming steps:

ignition on, engine OFF, bottle OFF
arm system, Led on
press program button, Led flashes
actuate throttle (normally to wot, but in your case 60% would be cool), Led solid
press program button, Led changes color
verify if it's where you want by slowly actuating the throttle and listening for the zex to click (rinse and repeat if necessary )
done, and good luck

Later, x
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Old 12-29-2004, 09:42 AM   #6
cdvma
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^^^ do exactly that but if you have an OBD scanner or something like Delta Dash, plug it in to monitor TPS while you are doing this.
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Old 01-02-2005, 03:41 AM   #7
Equilibrium Tuning
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Quote:
Originally Posted by xFactor
It's easy. Reprogram the tps set-up. Instead of WOT, go half-way, or wherever you want. While in programming mode, the unit looks for the highest recorded voltage. Most tps's max out voltage slightly before they hit the mechanical stop. That's the reason for the 90% activation on some cars, they all have different tolerances.

If the ecu sees 55ish% tps, then it flips to open-loop. I would highly suggest being there (open-loop) when programming your activation point. You can verify all of this with an OBDII scan tool, it's invaluable.

Anyway, here are the programming steps:

ignition on, engine OFF, bottle OFF
arm system, Led on
press program button, Led flashes
actuate throttle (normally to wot, but in your case 60% would be cool), Led solid
press program button, Led changes color
verify if it's where you want by slowly actuating the throttle and listening for the zex to click (rinse and repeat if necessary )
done, and good luck

Later, x
Good advice except that the OL/CL switchover is closer to 70% TPS (atleast on a stock 02-03 ECU).

-- Ed
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