[Diy_efi] Donegan ECU

Fri Jan 5 18:45:26 UTC 2007

And BTW my Mustang has a ~300 lph pump in it now (Holley Black
professional model) :-) A4 4 bolt mains block at 4.0 bore, 342 cubic
inches with a nascar stroker crank, 8:1 CR and 15lbs of B&M Roots style
blower - and of course it's not street legal here in the peoples
republic of CA... Will likely yank the engine and put it in something
pre-1972 so I can daily drive it again...

On Fri, 2007-01-05 at 12:26 -0600, cobraman at insightbb.com wrote:
> I would like to see a PWM controller with a different purpose - say a 2 speed version - then you could use a 1000 HP pump on the street w/o beating the fuel until it boils. Run the pump, with a regulator, at say 50 lph until full throttle or boost starts, then kick it into high......  just food for thought.  TomS 
> 
> ----- Original Message -----
> From: "Steven P. Donegan" <donegan at donegan.org>
> Date: Thursday, January 4, 2007 12:41
> Subject: Re: [Diy_efi] Donegan ECU
> To: diy_efi at diy-efi.org
> 
> > Well - for track days I simply put dry ice in my fuel cold-can 
> > thing -
> > that solves most vapor-lock style problems and lasts for a 
> > couple of
> > hours. Simple low-tech solution to that problem. Given the lack of
> > response to my original posting I believe providing PWM fuel pump
> > control and support for a fuel pressure sensor is useful. 
> > 
> > Given that I normally run at Willow Springs or Buttonwillow 
> > during the
> > winter months temps are not normally a factor anyway.
> > 
> > On Thu, 2007-01-04 at 12:23 -0600, cobraman at insightbb.com wrote:
> > > My "Edelbrick" ProFlow has fuel pressure controlled with 
> > engine vacuum. On track sessions on very hot days, the fuel in 
> > the rails will boil under hard braking - accelerator closed (low 
> > fuel pressure). When you finally step on it (52 psi), nothing 
> > happens until the vapor "recirculates" or is expelled.  
> > Usually takes a second or so.  I don't think dead heading 
> > would do any better - probably just need to keep a constant fuel 
> > pressure. 
> > > IMHO, hot fuel should give better economy - easier to vaporize 
> > - for those green members.  TomS
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > ld
> > > > consume the gas in the rails well before it got warm :-) 
> > However this
> > > > does raise a point - perhaps my ECM/PCM/EFI computer needs a 
> > way 
> > > > to open
> > > > a fuel return line and to sense fuel temp in the rails? Any 
> > > > ideas on how
> > > > useful that would be in the 'real world' anyone?
> > > > 
> > > > On Thu, 2007-01-04 at 14:56 +0800, Mike wrote:
> > > > > Isnt one of the main needs for fuel return the fact the 
> > fuel 
> > > > is heated quite a
> > > > > bit in the fuel rail whilst its waiting for injection ?
> > > > > 
> > > > > Of course there is a commercial factor as fuel returns 
> > used to 
> > > > be so
> > > > > much cheaper than any electronics but getting around the 
> > fuel 
> > > > heating etc
> > > > > 
> > > > > Also the issue of control feedback is an issue to avoid 
> > > > vapourisation> during hot start, the good thing about return 
> > is 
> > > > this can be flushed out,
> > > > > and esp for a turbo as a pressure hold tank can "remember" 
> > the last
> > > > > max pressure and temporarily raise the fuel rail pressure 
> > to 
> > > > this during
> > > > > start to avoid vapour issues... etc
> > > > > 
> > > > > Regards
> > > > > 
> > > > > Mike
> > > > > 
> > > > > 
> > > > > 
> > > > > At 07:23 AM 1/4/07, you wrote:
> > > > > 
> > > > > >This sounds cool...is closed loop control of fuel 
> > pressure an 
> > > > oem feature for any new vehicles? Or just something you are 
> > > > trying out? Are you going to use a PI controller? I am 
> > guessing 
> > > > when you snap the throttle open the PI controller should 
> > know 
> > > > about this quite quickly...not wait to see a drop in fuel 
> > > > pressure? 
> > > > > >
> > > > > >> To add something somewhat useful to the list in this 
> > reply 
> > > > I'll say the
> > > > > >> Donegan ECM is coming along nicely :-) The input board 
> > is 
> > > > going to fab
> > > > > >> out at about 3.0 inches by 2.2 inches (exactly matching 
> > the 
> > > > CPU board -
> > > > > >> ARM based Steve). Inputs designed in are MAP, MAT, 
> > > > Barometric, Coolant,
> > > > > >> Throttle, Oil pressure/temp, 4 ea O2 sensors, Crank and 
> > Cam 
> > > > position, 2
> > > > > >> ea EGT sensors - well pretty much everything everyone 
> > told 
> > > > me should be
> > > > > >> sensor inputs. Fuel pressure input I'll put on the 
> > 'relay' 
> > > > control board
> > > > > >> - that will do PWM control of the fuel pump eliminating 
> > the 
> > > > need for a
> > > > > >> regulator or return line.
> > > > > >> 
> > > > > >> Happy New Year :-)
> > > > > >_______________________________________________
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