Megasquirt: group buy / assemble ?

[brianm@earendel.org (Brian McGarvey)]

These are all great points. Sorry I didnt realize that people wouldn t 
realize that this is a REPLACEMENT for the CIS and it is only the 
controller portion. THere is still much to be acquired to do this.

This is why im brining it up to the list. (sorry bout the typos im lagged) 
So there are other things that we can include if we decide to "spin our 
own" 'squirt system we can use the AVR squirt + our own mods to add a 
ignition mapping to the system to allow for remapping of the ignition 
while still maintatining all the KE-jetronic ignition items. and Yes itt 
can be done. With the knock sensor and everything. 

Brian


 On Tue, 15 Apr 2003, Dan Bubb wrote:

> I would like to add a couple thoughts since I've built, installed and tuned
> a 'Squirt.
> 
> > Issues.
> > sensor layouts and wiring lengths
> > metal fabrication of the enclosure boxes. purchase is easily avail, but
> > faceplate cutout is the issue.
> > electronic parts assembly and test.
> > They use some basic non weather/harsh environment connectors we might want
> > to upgrade, cause well - A1's leak.... alot... often ... right on fuse
> > boxes..
> 
> The Megasquirt cannot be installed in the engine compartment. It's not
> sealed in any way and some components are not rated for underhood temps. So,
> the "D" connector is no real downside. All connectors in the engine
> compartment should be sealed, either stock VW/Bosch connectors or the
> appropriate connector for the GM sensors if you go that way (which isn't a
> bad thought since it eliminates the need to recalibrate the 'Squirt for the
> VW
> sensors).
> 
> > This only supplies the electronics. we need to find an easy and cheap
> > solution for mountable fuel rails for the stock 8v head, stock 16v head,
> > the xflow, g60, 20v all have one already. The best solution IMHO would be
> > a stock VW part like the late model cabby digi2 fuel rail, but pressure
> > issues may be a problem for really high boost apps.
> 
> Some data from the Megasquirt list is that the air shroud 8V head can use
> injector inserts, fuel rail and rail brackets from the G60 (and this is
> exactly what I have on my Scirocco). Apparently, non-air shroud heads have a
> different thread for the injector insert and do not have the tapped holes
> for the fuel rail brackets. The Megasquirt list may have a solution for
> this.
> 16V rail needs to be aftermarket AFAIK.
> I personally don't see any pressure issues. A "normal" fuel pressure
> regulator is 3 bar. Running 1.5 bar boost fuel pressure would be 65 psi.
> Easily in the range of the CIS fuel pump and not that high in overall terms.
> No need to crank up fuel pressure to get adequate fueling since you can
> install a large an injector as you need.
> 
> > A starting/default map for each of these motors.
> 
> Megasquirt comes with a default map that worked fine for starting my
> nephew's ABA. The big challenge is getting it started. Once it's started you
> can immediately adjust the map based on O2 output.
> I don't want to rain on anybody's parade, but sharing maps will never get
> you an optimized map for your car. Different cams, different cam timing,
> different exhausts, different turbochargers and intercoolers.....all change
> the map to some extent. Changing cams can effect the map significantly.Using
> different sized injectors will change the map alot.
> So, I think everybody contemplating this should be willing to learn how to
> use the tuning software to tune their own car. With the Megasquirt it just
> isn't that difficult although alot of care will be needed if you're running
> a boosted application. NA engine tuning is  simple even using a narrow band
> O2. Getting the basic fuel map to a 90% level can be done in ~45 minutes. It
> will take time to get the various enrichments right. After all you can only
> get one good cold start per day.
> 
> just my .02
> Dan
> 
> 
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> 

-- 
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Brian 
88 16v $2003 GRM challenge car http://www.grmotorsports.com
84 0v Next years car got parts?
82 2.0L Topless bunny -- Knock Ignition and bigger clutch. next.
90 90q20v doing daily driver duty. 
91 VFR750F everybody needs a 11-12 sec vehicle.

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