[Diy_efi] fast-ish 6 channel data logger

[niche at iinet.net.au]

Ah interesting,

What i'd suggest as a tangential stab in the dark, is

Measure temp sensor resistance (NTC type ?) when
hot and when really really cold, then substitue a fixed
resistor of the same value as when hot (or warm) when
you start the whole setup when its cold and see how it performs.

other thing is check voltage at injectors when cranking cold
as the bosch ecu for the RB30 motor has a fair compensation
for low battery volts, it surprised me a couple of times how
it managed to crank with really low battery volts...

Although this is not a solution to a datalogging issue, it
might point to a temp sensor issue, I recall all sorts
of grief with my cars production efi some years ago
which was *both* a bad sensor *and* corroded connections,
heck of a thing to fix at the time having a combinatorial
fault like that. ie  A direct substitution didnt fix prob...

The other thing that comes to mind is, as its a homegrown
efi, do you have a timer range issue, ie Enough range on the
timer when cranking really slow so the timer doesnt wrap around...
depending of course how you worked out the dynamic range requirement
for the firmware etc,

Rgds

mike



At 05:04 PM 20/04/05, you wrote:
>Adam
>
>that was my initial thought, but then i have decided i wanna see exactly what happens when cranking to injection durations and sparks for both cyls, in relation to the phase sensors. so a data logger, or maybe even a logic analyzer seems to be the best (and cheap) solution. for a scope, i'd need a digital storage one with a few channels, or invent something to see the different events on only 2 channels. at the koment anyway i dont know where to borrow one. 
>
>
>moreover, i wanna see what the IAW does when cranking. so far, the IAW has been unbeatable at starting the engine even at subzero C temperatures. below 5C, we have huge starting problems. and we have tried a bit of everything. so at this stage i suspect soemthing might be wrong in the starting strategy. 
>
>perhaps reaching the TDC the voltage so low and the injectors so sluggish the durations are all wrong, or anyway variable, or sparks are just in the wrong place
>
>gm
>
>
>
>
>> -----Original Message-----
>> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
>> Sent: Dienstag, 19. April 2005 22:00
>> To: diy_efi at diy-efi.org
>> Subject: Re: [Diy_efi] fast-ish 6 channel data logger
>> 
>> 
>> --- "Gianmarco Rizzo (BE/EAS)" 
>> 
>> > i have a aftermarket EFI, and i would like to
>> > monitor exactly what happens while cranking the
>> > engine, so as to see exactly when spark and fueling
>> > occur in comparison with phase sensor pulses
>> 
>> Can't you borrow an oscilloscope?  Sounds like that
>> would be the easy solution.
>> 
>> | 82 Honda CX500 Turbo (Cassandra)  90 Kwak Zephyr 550 (Daphne) |
>> | "It was like an emergency ward after a great catastrophe; it  |
>> |   didn't matter what race or class the victims belonged to.   |
>> |  They were all given the same miracle drug, which was coffee. |
>> |   The catastrophe in this case, of course, was that the sun   |
>> |     had come up again."                    -Kurt Vonnegut     |
>> | M/C Fuel Inj. Hndbk. @ Amazon.com -  http://tinyurl.com/6o3ze |
>> 
>> 
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Regards from


Mike Massen
Perth, Western Australia
VL Commodore Fuse Rail that wont warp or melt !
http://niche.iinet.net.au