modifiying standard injection

[Adrian R]

thanks Bill

I will have a read of everthing I can get My eyes on

The only problem I can see (We have the gm computers you speak of here in 
australia too and i have seen many applications of them) is that I want and 
sort of need to retain the toyota computer, for a number of reasons, but 
mainly cost. This means I will only be able to modify the inputs the 
computer sees or modify the outputs AFTER the computer has done its work, 
based on boost pressure etc.

Cost is a MAJOR issue for Me. Even the GM computers here in Australia will 
set Me back (on average) $400 to $500 without software which is around $200 
(Don't forget the exchange rate and our GST before you berate Me about the 
costs). Add to that the $80 dollars an hour required for dyno time and it 
all gets a bit out of hand. For about that price I can buy a brand name 
piggyback computer or for $100 more, the first of the Microtech range of 
ECU's and have a LOT more tuneability and installation flexability. 
Therefore changing to another computer is not an option.

I know it makes life difficult, but retaining the factory computer has to be 
the basis of this project. I already intend building and modifify one of the 
projects I have seen on the list to build a data logging system for TPS, MAP 
and RPM. This should give Me a good starting point.

The motor is not intended to be a super horsepower machine. Mild boost is 
being considered (6-7psi), espically taking into account the factory 9.0:1 
compression ratio and factory clutch, gearbox and driveshafts. It is more 
intended to make the car more comfortable on the open road.

Has anyone ever built their own micro fueller or something similar, using it 
to fire and control extra injectors dependant on boost ec?

thanks again
Adrian
ajrgsr at hotmail.com

>From: "William Shurvinton" <shurvinton at orange.net>
>To: <ajrgsr at hotmail.com>
>Subject: Re: modifiying standard injection
>Date: Wed, 16 Jan 2002 23:38:33 -0000
>
>Hi Adrian,
>
>Best place to start is www.diy-efi.org Go to the GM_ECM pages and read
>everything there. There are some well sorted GM ECMs for turbo cars that 
>can
>be got cheaply and programmers for them. Also the guys on the list are very
>knowledgable.
>
>Rgds
>
>Bill
>----- Original Message -----
>From: Adrian R <ajrgsr at hotmail.com>
>To: <DIY_EFI at lists.diy-efi.org>
>Sent: Wednesday, January 16, 2002 2:42 AM
>Subject: modifiying standard injection
>
>
> > hello there... I'm new to the list, but it seems excellent
> >
> > I have a question and it may seem strange, but My finances are not what 
>I
> > would like and I have everything I need to turbocharge My 1994 Toyota
> > Corolla Sprinter EXCEPT a computer. Aftermarket computers are becoming
> > prohibitivly expensive (which is strange seeing as MOST aftermarket
>systems
> > are developed here)
> >
> > I understand basic electronics and computers... I probably understand 
>more
> > advanced ones too as long as I take the time to read it properly.
> >
> > I was wondering how far the inputs on a factory computer can be modified
>and
> > by what means. I have seen simple variable pots do amazing things to
>factory
> > computers but I am not sure of the processes or how well factory 
>computers
> > learn. I read an artical of a similar fit to what I want to do (on a
> > different car). The writer wrote about "re-learning" the computer by
> > disconnecting the O2 sensor and driving around (removing the computer's
> > ability to close loop) manually adjusting fuel mixtures to keep them
> > relativly correct using a simple circuit of pots to adjsut map sensor
> > inputs. The artical continues to say that after only a few days of 
>normal
> > and hard driving, he was able to re-coonect the O2 sensor and the 
>computer
> > continued to run the car as if it was its normal prgramming.
> >
> > I have even considered building My own micro-fueller, running 1 or 2
> > injectors idependantly. I have a few ideas on how to do this but am 
>still
> > investigating
> >
> > any ideas, comments or suggestions would be greatly appreciated. Please
> > contact Me directly at ajrgsr at hotmail.com as I can not garruntee getting
>to
> > the lists
> >
> > thankyou
> >
> > Adrian
> >
> >
> >
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