[Diy_efi] fast-ish 6 channel data logger

Wed Apr 20 09:35:13 UTC 2005

Hi Mike

yes good suggestions. sensors are all under control because i have a display showing me all the time temp and press values.

the timer range issues should have been solved now. it actually happened before.

the problem is that the ECU was initially developed for a guzzi, and the guy who made it is in Oz, so never have low temp problems :-)

doing tests and research with 8 hours time difference can be demanding.

i have done a lot of research on how the IAW works. seems that one of the strategies is to start with a cranking enrichment which decreases with engine revolutions, according to a map.
on top of this there are different corrections for voltage and temperatures.
still, the IAW is wrapped in a cloud of mystery. no docs available, only some reverse engineering done, mostly on the version for cars. the bike version has been researched a lot less, and not much info is available

so i am curious to see how the IAW starts the engine at cold temps. at the moment, i dont need to simulate temperatures, just leave the bike outside :-) we have around 5C now.

the IAW is really unbeatable at this, half slow turn of the engine and it starts. wanna find out how it is done.

br

gianmarco

> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
> Sent: Mittwoch, 20. April 2005 11:24
> To: diy_efi at diy-efi.org
> Subject: RE: [Diy_efi] fast-ish 6 channel data logger
> 
> 
> 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

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