[Diy_efi] TPS Specs / PN's

Sat Dec 30 02:27:13 UTC 2006

Thanks, Scot,
That's next on my list of projects over the long weekend (if I get my
Daytona put back together, that is).  I've got TunerProRT that I've been
using to diagnose the basics of what was going on during the no-start
debacle (TPS wired wrong so ECM saw 100% throttle at startup, i.e., clear
flood...), and now that it's running, I can sort out the IAC issue I think I
have.  I can easily check the %throttle then.  I am sure that the blades are
fully open, and I was checking the TPS while mounted/wired.

Best case, this can be solved with software; worst case, something that I
have to put together on a steep learning curve...

Clair

----- Original Message ----- 
From: "Scot Sealander" <ssealander at Stny.rr.com>
To: <diy_efi at diy-efi.org>
Sent: Friday, December 29, 2006 4:43 PM
Subject: RE: [Diy_efi] TPS Specs / PN's

>
> You don't have to use an op-amp to do what you want to do!
>
> First, are you sure that the throttle blade is fully opening?  If it is,
and
> the 3.8 is all the volts it gets, that is OK.  Just change the gain factor
> inside the ECM code to reflect that 3.8V is the max value.  If it is set
to
> 0.5 volts at idle, and the max is 3.8V, then you need to change the gain
> factor to the value X, where (3.8V - 0.5V)X = 5.0 volts. 5.0/3.3 = 1.5, so
> the gain value is 1.5
>
> The stock gain value is 1.65, so it looks like the stock code considers
your
> 3.8 volts WOT no problem.
>
> If you have a scan tool, look at the scaled TPS value, and see if it
reaches
> 100% TPS, I suspect that it already does.
>
> Scot
>
> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
> Behalf Of Clair Davis
> Sent: Friday, December 29, 2006 2:54 PM
> To: diy_efi at diy-efi.org
> Subject: Re: [Diy_efi] TPS Specs / PN's
>
> I guess at some point, I'd do myself a favor if I learned something about
op
> amps and other little electronic widgets I could make myself, but I know
> squat about them at the moment.  I still have my "Principles &
Applications
> of Electrical Engineering" text, but only because it was so full of errata
> that the bookstore wouldn't buy it back after that semester...
>
> I'd really prefer to have a PN/application that I could ask for at any
given
> parts store should the thing fail out in BFE.
>
> Clair
>
>
> ----- Original Message ----- 
> From: "Mike" <niche at iinet.net.au>
> To: <diy_efi at diy-efi.org>
> Sent: Thursday, December 28, 2006 12:55 AM
> Subject: Re: [Diy_efi] TPS Specs / PN's
>
>
> > an LM 324 op amp would do it, few app notes on that around the
> > web, its a 14 PIN ic with 4 x opamps, select resistors for multiply
> > by 5/3.8 and use one as buffer amp at front end for 1:1, that and a
> > zener regulator would be all you need... cheers
> >
> > mike
> >
> > At 12:50 PM 12/28/06, you wrote:
> > >I've run in to an issue with my TPS that may become a problem in the
near
> > >future.  I'm using a Mopar Performance billet 4V 1000cfm throttle body
> that
> > >came with Mopar-type sensors (MAP, IAC, TPS) as it is the "off-road"
> > >replacement for the Magnum V8 throttle body.  Although the MAP and IAC
> seem
> > >to be pretty straight forward, the TPS is both non-adjustable, and
> doesn't
> > >seem to reach full voltage at WOT.  By relocating the mounting holes, I
> was
> > >able to achieve 0.5V at idle, but I can now only get about 3.8V at WOT.
> I'm
> > >not sure how the Magnum trucks dealt with this issue, but I don't think
> my
> > >'7730 is going to be happy as-is.
> > >
> > >I suspect that I may be able to program around the WOT voltage limit,
but
> > >I'd prefer not to if at all possible.  This now brings me to my
> question...
> > >is there a resource out there that discusses the various options for
> TPS's?
> > >I'd like to see if there is something out there that will give +/- 5.0V
> at
> > >WOT and still give 0.5V at idle, AND be correctly "handed" for my
> > >application.  I would estimate that the throttle shafts turn about
80-85%
> of
> > >the GM TB I have in the garage when at WOT.  I've got a catalog on TPS
> units
> > >made by Tomco.com, but it doesn't get in to the guts of the specs, just
> PN's
> > >and ID photos.
> > >
> > >Any help greatly appreciated, especially now that the critter is
running.
> > >Idles OK (needs IAC tweaking), throttle response is nice (not moving
> yet),
> > >but I want to make sure it KNOWS that it's at WOT when it is.
> > >
> > >Clair
> > >69 Valiant 340/'7730
> > >FTWTX
> > >
> > >
> > >_______________________________________________
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>
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