If the only TEC control option is to switch modes at 2.5v then I'd suggest adding a resistor in series with one of the TPS wires so that the 2.5v point occurs at the butterfly angle where you want the change-over to occur. For example, if you want 2.5v to occur at 90% throttle, then add the resistor in series with the +5v power source to the TPS. Or if you want it to occur at 20% throttle then add the resistor in series with the ground lead to the TPS. The resistor value can be calculated based on the TPS resistance values measured (wiper to each of the other two leads) at the desired changeover throttle position.
----- Original Message ----- From: "Gerry Noble" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Sunday, November 02, 2008 8:01 AM Subject: FW: Re: FW: Re: TPS signal and TPS-based boost This is as we believe the best thing to do. ----- Original Message ----- Subject: Re: FW: Re: TPS signal and TPS-based boost Date: Sat, 1 Nov 2008 17:24:52 From: CHris Noble <[EMAIL PROTECTED]> To: Gerry Noble <[EMAIL PROTECTED]> Any Honda, Ford, GM TPS will work the major issue is getting it to work on a 99 Throttle body. I would use a GM TPS its cheap and then modifiy the throttle body to work. Other option is use a Ford or GM aftermarket throttle body that has the TPS on it and mak and adaptor flange to fit the 99 mainifold. --- On Sat, 11/1/08, Gerry Noble <[EMAIL PROTECTED]> wrote: From: Gerry Noble <[EMAIL PROTECTED]> Subject: FW: Re: TPS signal and TPS-based boost To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> Date: Saturday, November 1, 2008, 6:45 AM Maybe you can under stand this one. I think they need to use a Honda TPS which will give them a 0-5v. What do you think. ----- Original Message ----- Subject: Re: TPS signal and TPS-based boost Date: Fri, 31 Oct 2008 22:51:45 From: Ray Ayala <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>, <[email protected]>,Martin Eby <[EMAIL PROTECTED]> I can't speak to the TEC issues but the description of the OEM stuff is correct except that three of the four '94-'97 TPS wires should be the same as the '99 3-wire TPS (the 4th wire is simply an additional idle switch). ----- Original Message ----- From: "Martin Eby" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; <[email protected]> Sent: Friday, October 31, 2008 2:02 PM Subject: TPS signal and TPS-based boost > This is mostly directed at JasonC, but any and all responses are welcome. > My car is currently about 800 miles from where I am. They guy > working on it is, at my request, trying to implement TPS-based boost > (Less throttle = lower boost target. More throttle = higher boost > target.) on a TEC ECU (TEC-GT if it matters.) > > Here's what he's reporting: > > "I am trying to get the TPS-based boost working nicely. Initial > problem was that the TPS read a minimum of .52V closed and 3.55V > open. The way it works is to hook the TPS up to a GPI channel on the > TEC (already done) and then use that channel to trim the boost duty > cycle map. The way the trim works, however, is that anything from > 0-2.5V will reduce our duty cycle by up to 50%, anything from 2.5-5V > will increase it by up to 50%... so I need to get the TPS to read > closer to 5V at WOT. > > The 99+ cars have a three wire non-adjustable TPS, so from the > factory, where it is is where it is. I have explored a couple of > different options. An adjustable 94-97 will not work because it is a > four wire." > > and > > "One solution would be to physically rotate the TPS to where it will > read higher voltage per throttle input, and drill and tap the > throttle body for the new base setting. This is not a perfect > scenario; once screw would solidly mount to the throttle body, the > other would be used with a little fabricated bracket to make sure the > TPS physically stays on the throttle body. However it would result in > the numbers we are looking for with no electrical gizmo action (WOT > reads 4.88V)" > > and > > "The GPO trim function is set up in the firmware, there is no way to > change how it responds to the voltage... so anything below 2.5v will > decrease duty cycle, and anything above increases. You can't change > the negative/positive value set point, 2.5 is the magic number." > > The car is a '99. My question are these: > 1) Does this sound right to you? > 1a) The stock TPS doesn't read 0-5V? > 1b) The TEC doesn't support "mapping" or even "offset and scale" an > input voltage? > 1c) None of the TEC's input/output map function coudld be used to > accomplish this? > > 2) How did you implement TPS-boost on your car? > 2a) Is the boost signal taken from before or after the throttle > plate? (I would prefer to take it separate from from before the > throttle plate in order to minimize backpressure and inefficiency at > smaller throttle openings..) > 2b) Any problems with reliability or resolution? > > Thanks in advance, > > M. > > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
