[DeTomaso] Intake port spacing

Tue Mar 22 16:33:25 EDT 2022

You are correct, it should make no difference to how the EFI system operates (accept for one small difference that idle valve control output would send signal to ETB’s instead of idle valve).

This is why I am hoping to find on standalone system that would just control the throttle bodies and simply send TPS signal back to ECU; just as mechanical throttle would.

Main advantage and motivation t use ETB is to eliminate challenges of properly balancing 8 mechanical throttle bodies, and also to keeping them in balance due to vibrations and any play in the linkage.

With ETB this fine-balancing would be done in the software and it is likely to remain more stable over the time.

In addition to that, ETB would offer progressive adjustment in throttle response rate, so at small accelerator paddle angles I could adjust the throttle to respond slower and improve drivability at low rpm/low gear/slow speed situations.

The fact that this 52mm Bosch throttle bodies are available at just over $50 each and they fit perfectly intake manifold I got on hand was another motivation for the project.

Cheers, Robert

From: Ken Green <kenn_green at yahoo.com> 
Sent: Tuesday, March 22, 2022 5:01 AM
To: detomaso at server.detomasolist.com; Robert Stroj <npdrs at maui.net>
Subject: Re: [DeTomaso] Intake port spacing

If a signal from an electronic gas pedal opens the ETB's, why is that different from mechanical linkage opening them as far as an EFI system is concerned?

On Monday, March 21, 2022, 07:04:15 PM PDT, Robert Stroj <npdrs at maui.net <mailto:npdrs at maui.net> > wrote: 

Hi, working on building an 8-stack ITB system using eight 52mm Bosch

Electronic Throttle Bodies (available at very reasonable cost as they are

OEM on Ford 1.6l Ecobust).

Main motivation for this project is to eliminate mechanical play in linkage

system (keeping them balanced) as well as have a possibility of adjusting

progressive throttle movement and improving drivability at very small

throttle opening. 

Does someone knows of a good stand-alone system to control 8 ETB's; after

searching the net found lots of options for single an sometimes double TB's

but failed to find an 8 channel system.

Would need an independent system as my XFI2.0 does not have option of ETB

control, so only communication between the two would be TPS output to XFI

and ideally Idle Valve output from XFI to throttle controller to use

controlling the idle. 

As well, please if someone could confirm the distance between the intake

ports on Yates C3 heads (center to center); believe this is the same for any

351c heads?

Strangely, looked a lot on the net and could not find any drawing showing

this distance and do not have on hand any intake manifold or intake manifold

gasket to check.

Need this measurements as it could be there is some clearance issues to fit

the throttle bodies next to each other as they are 117mm wide and if I am

correct, intake ports are 111mm center-to-center (please if someone could

confirm).

If this project becomes successful will be happy to share the details.

Thanks, Robert

_______________________________________________

Detomaso Email List is not managed by POCA

Posted emails must not exceed 1.5 Megabytes

DeTomaso mailing list

DeTomaso at server.detomasolist.com <mailto:DeTomaso at server.detomasolist.com> 

http://server.detomasolist.com/mailman/listinfo/detomaso

To manage your subscription (change email address, unsubscribe, etc.) use the links above.

Members who post to this list grant license to the list to forward any message posted here to all past, current, or future members of the list. They also grant the list owner permission to maintain an archive or approve the archiving of list messages.

-------------- next part --------------
   You are correct, it should make no difference to how the EFI system
   operates (accept for one small difference that idle valve control
   output would send signal to ETB's instead of idle valve).

   This is why I am hoping to find on standalone system that would just
   control the throttle bodies and simply send TPS signal back to ECU;
   just as mechanical throttle would.

   Main advantage and motivation t use ETB is to eliminate challenges of
   properly balancing 8 mechanical throttle bodies, and also to keeping
   them in balance due to vibrations and any play in the linkage.

   With ETB this fine-balancing would be done in the software and it is
   likely to remain more stable over the time.

   In addition to that, ETB would offer progressive adjustment in throttle
   response rate, so at small accelerator paddle angles I could adjust the
   throttle to respond slower and improve drivability at low rpm/low
   gear/slow speed situations.

   The fact that this 52mm Bosch throttle bodies are available at just
   over $50 each and they fit perfectly intake manifold I got on hand was
   another motivation for the project.

   Cheers, Robert

   From: Ken Green <kenn_green at yahoo.com>
   Sent: Tuesday, March 22, 2022 5:01 AM
   To: detomaso at server.detomasolist.com; Robert Stroj <npdrs at maui.net>
   Subject: Re: [DeTomaso] Intake port spacing

   If a signal from an electronic gas pedal opens the ETB's, why is that
   different from mechanical linkage opening them as far as an EFI system
   is concerned?

   On Monday, March 21, 2022, 07:04:15 PM PDT, Robert Stroj
   <[1]npdrs at maui.net> wrote:

   Hi, working on building an 8-stack ITB system using eight 52mm Bosch

   Electronic Throttle Bodies (available at very reasonable cost as they
   are