[DeTomaso] efi horse power gain

Sun Aug 9 03:29:46 EDT 2009

I'm not sure what the difference is between Bosch and Lucas, but if you are going after high HP, I think you want low impedance (aka, peak & hold) injectors.  A lot of stock ECUs can't provide the power for low impedance injectors, but both the TEC-3 and FAST ECUs can.  The advantage is that a low impedance injector opens quicker, so if you have a high flow rate injector, you can control it better at low fuel demand.

I have been told that it is easier to tune the FAST ECU, but that may depend on who does the tuning.  I think you can actually spend more on dyno tuning than what you pay for the ECU, so it's probably best to get hooked up with an experienced local tuner and get the ECU he likes to tune.  It also may be important that the tuner has done 8 stack systems, but I'm just speculating on that.  Like someone said, an EFI system is only as good as it's tuned.

And, every expert you ask will give a different opinion.

Ken

--- On Sat, 8/8/09, boyd casey <boyd411 at gmail.com> wrote:

From: boyd casey <boyd411 at gmail.com>
Subject: Re: [DeTomaso] efi horse power gain
To: "Kirby Schrader" <kirby.schrader at gmail.com>
Cc: wkooiman at earthlink.net, "De Tomaso List" <detomaso at realbig.com>
Date: Saturday, August 8, 2009, 5:00 PM

I have been speaking to Gary at twm induction and they actually use a
weber intake manifold and machine it to adapt the injectors . He said
that the FAST computer was the way togo now adays. The system Mad dawg
has was he top of the line back when he got it but the new fast system
is supposed to be supierior. The important factors are sequentail
injection vs batch injection, the speed of the system and how many
injectors it cam control. Also lots of the Weber style EFI have the
injectors and fuel rails on the out side and thats supposed to be a no
no. Another big factor is the injectors. Gary told me the Bosch were
far supierior.  ( cost around $300 or $400 more then the lucas
injectors. Many of the systems are designed as EFI for dummies. No
fuel return, no computer pprogram adjustmment neccesary. It seems to
me if your going to bite the bulet for $6500.00 + you may as well do
it right or just  go with a holley commander for around $2000.00.

Boyd

On Sat, Aug 8, 2009 at 6:33 PM, Kirby Schrader<kirby.schrader at gmail.com> wrote:
>
> Ah, yes.... another person doing
> IR EFI on a GT40. Let us know how you get on!
> Jack Houpe, Mike Trusty and myself all have a TWM setup with a TEC3r (Jack uses a TEC2)
> on our GT40's.
> Each one of us attacked the twin tank fuel feed setup differently.
> I need to re-plumb my fuel system. I have a 'better idea' than what I am using now.
> On 8 Aug 2009, at 11:23 AM, Julian Kift wrote:
>
> I am in the initial stages of an EFI retrofit on the GT40 with a TWM IR
> system. Even after getting a good deal on the TWM throttle bodies and the
> ECU it has cost far more than I care to tell in $$ and time (it's all the
> little stuff, plus the complexity of twin tanks in that application
> requiring a swirl pot etc.). I constantly ask myself why I didn't just buy a
> Weber 48IDF set up and may even still do that.
>
> For the Pantera I have a Kinsler mechanical unit that I will convert to
> EFI and the ECU will be the DTAFAST (out of the UK), it is as capable as a
> MOTEC at about half the cost.
>
> http://www.dtafast.co.uk/
>
> Julian
>> Date: Sat, 8 Aug 2009 10:54:49 -0400
>> From: boyd411 at gmail.com
>> To: wkooiman at earthlink.net
>> CC: kirby.schrader at gmail.com; detomaso at realbig.com
>> Subject: Re: [DeTomaso] efi horse power gain
>>
>> The EFI set up I am looking at and considering is basicaly the same
>> one Mad dawg has. It is a twm Induction stack (looks like webers) The
>> ECU I am considering is the FAST ( I spoke to dawg and this is a more
>> upto date ECU then he has) Another key component are the injectors.The
>> two things I don't have are Mike Trusty and the CASH! I'm working on
>> the cash but I don't know what to do about Mike.
>> Boyd
>>
>> On Sat, Aug 8, 2009 at 9:57 AM, Will Kooiman<wkooiman at earthlink.net>
>> wrote:
>> > There's a very dramatic initial negative increase.  In most cases, the
>> > initial increase is the carbureted HP * -1.
>> >
>> > After a year or two of fiddling around, EFI catches up.
>> >
>> > Then you get smart and buy Mike Trusty a plane ticket.  You treat him
>> > right,
>> > feed him, and brag about how your tires hook really well.  Then M.T.
>> > fiddles
>> > for 15 minutes, and finally EFI surpasses your carbureted HP.
>> >
>> > But then you need better tires.
>> >
>> > -----Original Message-----
>> > From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com]
>> > On
>> > Behalf Of Charles Engles
>> > Sent: Saturday, August 08, 2009 8:46 AM
>> > To: boyd casey
>> > Cc: Kirby Schrader; detomaso at realbig.com
>> > Subject: Re: [DeTomaso] efi horse power gain
>> >
>> > Dear Boyd,
>> >
>> >
>> >                  Perhaps Kirby Schrader would comment on this.   He had
>> > one
>> >
>> > of the Haltech EFI systems installed on his already healthy engine back
>> > in
>> > the mid nineties and he has first hand experience about the before and
>> > after
>> >
>> > performance.  He was very happy with the change.
>> >
>> >                             Warmest regards,  Chuck Engles
>> >
>> >
>> >
>> > ----- Original Message -----
>> > From: "boyd casey" <boyd411 at gmail.com>
>> > To: "De Tomaso List" <detomaso at realbig.com>
>> > Sent: Friday, August 07, 2009 10:50 PM
>> > Subject: [DeTomaso] efi horse power gain
>> >
>> >
>> >> Can anyone tell me what kind of horsepower increase one could expect
>> >> from the addition of a quality professionally setup sequential efi to
>> >> a Cleveland  engine?
>> >>
>> >> Boyd
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