cp3 info

[jtanguay]

if the system doesn't need multiple injections per cycle, then it could be made to run mechanically.  a distributor style system could be rigged up to signal the injectors firing, and maybe a potentiometer style setup could control the amount of fuel injected???

mechanical all the way baby!!! 

[gigaz2]

the injectors aren't "coded" they are calibrated, some injectors have 4 wires, the extra 2 are a precision laser trimmed resistor that tells the ecu how many mg/stroke/whatever that particular injector did on the test stand.

Jtanguay.. ecu is the only choice here, unfortunately

[gigaz2]

a faulty Mercedes 220CDI ecu just fell on my lap!! 

its the Universe telling me this 1Z wants CR 

[lord_verminaard]

YEAH!  Time to hack it.    I'll be watching. 

Brendan

[lord_verminaard]

Hmm, it appears Banks has a stand-alone ECU for the CP3 in the works:

http://www.bankspower.com/magazines/show/591-Clean-Speed

Read the whole article if you want, but the 5th paragraph mentions the standalone system.

Very interesting!!  Of course, with Banks products, you can spell it like this:  Bank$$$$$$


Brendan

[lord_verminaard]

Found something else interesting:
http://www.specialist-components.co.uk/cnb/shop/sconline?merchantPageID=5&op=merchantPage-merchantPageDisplay

No idea how much the cost will be, though judging from the other products on their page, at least a thousand bones.

Gotta be an easier way....


Brendan

[MikkiJayne]

Ok so from that it needs 3-5 injection events per cycle with microsecond timing and 100V injector drivers.

Megasquirt 2 runs at 24MHz and has microsecong injector control so that ought to be ok. It would need some extra code to have several injection events, and its definitely possible to build an external injector driver to fire at 100V since units like that have already been made for FSI, albeit not for Megasquirt.

So... is there anyone who knows how to write code for Megasquirt on here?

How would you go about mapping it? If you get it wrong, as Scott said, you could probably blow the head clean off!

Is there any data published anywhere on how the multiple events take place or timing info?

Edit - been doing more reading - injection pulse shaping bleh 

[lord_verminaard]

Heh, yeah, I'm pretty technically minded, but I started reading some of that stuff and found myself going cross-eyed. 

I'd like to see the Bosch manual on the CR injection- I guess it's 500-ish pages, but hell, so is my Corrado Bentley.    I'd like to know how much of the multiple events/timing is related to pure sound/emissions control or if it even has anything to do with how the damn engine runs.  I mean, 1.6D's run pretty good with one "loosely" timed squirt so it can't be THAT big of a deal.

Brendan

[gigaz2]

yup, as I see it, pre-injections are for smoothing the noise and shaping the delivery
post injections are used for emmisions

neither are needed but not that hard to implement on software after the main routines are set.

[MikkiJayne]

What does a VE-pump TDI do in terms of injection events?

[gigaz2]

basically.. nothing

the injectors have two springs so we get a pilot injection but its fixed, we can't control when they happen or how much fuel is used.
then comes the main

______/^\_____/^^^^^^^^^^^^^^\_____

         pre                     main


CR can place a injection event anytime, even when the valves are open.
and we can control the pressure on the rail  marvelous!

[MikkiJayne]

Cool thats what I thought. It should be pretty easy to replicate that with MSII with a bit of code tweaking.

So my thoughts go as follows...

Use a standard 60-2 crank sensor & hacked distributor for cam position
Control the fuel pressure using the ignition maps as a PWM signal
Control the injectors using the injection maps via a high-voltage driver board
Pilot injection is a % of the main injection event
VNT control using a spare PWM output (maybe anoher map?)

And we get something akin to a TDI in terms of noise & emissions (ie not as good as OE CR), but DIY mappable 

Whats wrong with that plan?

[gigaz2]

its a good plan, but a huge chunk of activity on this forum is based on getting rid of electronics, it would be a lot easier to just fit an ECU from a CR engine like the Mercedes 220 CDI (I4 2.2l 143HP stock) its a edc15c5 (or 6) and its flashable :O

[lord_verminaard]

I've seen reader/flashers for the edc15c5 for as little as $60.00- any software out there to read the maps?  I'd rather use that than try to make MS work.  No sense in re-inventing the wheel so to speak....

Brendan

[gigaz2]

I've seen reader/flashers for the edc15c5 for as little as $60.00- any software out there to read the maps?  I'd rather use that than try to make MS work.  No sense in re-inventing the wheel so to speak....

Brendan

yap, well said

there are a few softwares to mess with the image once read, chiptuners have them, some leak on the "less legal channels"