Advice requested for choosing aftermarket EFI system

[Robert]

Thanks Huw, appreciate your input.
Robert
----- Original Message -----
From: "Huw Scourfield" <huw.scourfield at lineone.net>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, January 02, 2002 3:10 PM
Subject: Re: Advice requested for choosing aftermarket EFI system


> Robert, my opinions:-
> 1 Multi- tothed crank sensors, if the engine is not likely to  be subject
to
> rapid speed fluctuatations(as in your application) then you are unlikely
to
> see any benefit, however if this is a "free "addition i would include it.
> 2 Direct fire, definiately better as far as losses, possible failure
points
> are concerned.
> 3 Sequential or semi sequential "should" give better mpg figures, but the
> differences will be small.
> 4 Only run on 97 octane if the engine needs it, if it's a low comp unit
then
> there will not be any advantages.
> 5 Map would be my choice for accuracy and response, espcially for a low
tune
> engine.Tps can be used also, for accell fuelling alone.
>     Huw
> ----- Original Message -----
> From: Robert
> To: DIY_EFI at lists.diy-efi.org
> Sent: 02 January 2002 04:53
> Subject: Advice requested for choosing aftermarket EFI system
>
>
> Hi All,
>     I'm trying to decide on an aftermarket engine management system for my
> Motorhome, since I'm not learned enough to design my own, and there are
> several good commercial units available. I have, however designed and am
> currently testing a stand alone controller for the transmission. When I've
> got the bugs worked out of it, the next step is to install an engine
> management system that will allow me complete control of the engine.
>
>     The subject is on a '92 Ford Super Duty chassis, 7.5L EFI V8, E4OD
> transmission, 17,000 lb GVW. With the exception of a Banks "Power Pack" 4
in
> 1 long tube primary header exhaust and free flow intake system, and an
> "Aurora" high output inductive discharge ignition system, the engine is,
and
> will likely remain stock. Ignition pick up is distributor hall effect
sensor
> to a remote TFI module. It uses batch fired injectors mounted in the
> individual intake ports, 2 banks, 4 of 24 lb/hr injectors per bank.
>
>     Normal operating range is between 1800 and 3000 RPM, but will
> occasionally pull down to 1500, and rev to 3600 to shift.
>
>     This is not a high performance application, but rather a low
compression
> ( 8.5:1 ) slow turning engine that will run heavily loaded much of the
time.
> The object is to tune for best power under heavy load, and best economy at
> cruise, economy having a slightly higher priority.  Emissions issues are
not
> a concern.
>
>     I had originally only considered SDS www.sdsefi.com . They have a good
> reputation, and product support is without equal, but it lacks some
features
> I would like, so I've been researching Halltech, Electromotive TEC II, and
> DTA. They are all fairly similar, but are different enough that I'm
finding
> making comparisons a bit difficult.
>
>     I'd really appreciate some opinions on experiences any of you may have
> had with any of these manufacturers, as well as what features would be
best
> suited to my application. These questions, posed to some of the dealers
were
> met with unsatisfactory responses, or no response at all. They are as
> follows.
>
> Given the application;
>
> 1 - Is there any advantage in multi toothed crank angle sensors or 4
magnet
> crank angle sensors as opposed to the stock hall effect distributor pick
up?
>
> 2 - Is there any advantage to direct fire, waste spark ( 4 coils )
ignition
> as opposed to distributor?
>
> 3 - Is there any advantage to sequential,  "semi-sequential"  ( cylinders
> paired for ignition with paired injectors),  or batch fired every engine
> revolution, as opposed to batch fired on alternate engine revolutions?
>
> 4 - Is there any advantage in tuning for use with 92 octane fuel as
opposed
> to 87?
>
> 5 - Would it be better to use MAP, or TPS for load sensing?
>
> Thanks in advance.
> Robert
>
> ----- End of forwarded message from owner-diy_efi at diy-efi.org -----
> --------------------------------------------------------------------------
--
> To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the
quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>

----- End of forwarded message from owner-diy_efi at diy-efi.org -----
----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org