[Diy_efi] 4v throttle body

[Mustang Man]

I've read the previous posts on the is topic and haven't been quite
satisfied for what I wan to do.  Here is my repost from the MegaSquirt list.
Maybe you can offer some additional information. Im not interested in using
the horn from one of the OEM TBI injections, se bellow.

>>> On Sun, Jun 15, 2003 at 03:00:38PM -0700, Mustang Man wrote:
>>> 
>>> In the DIY Spirit, I am considering retrofitting a Holley 4V carb with a
>>> throttle position sensor so I won't have to buy an expensive after market
>>> air-door throttle body. The engine will be fitted with multi port injection
>>> on a ford 302 (68 Mustang). I think using an old carb as a air door is cool
>>> in that it keeps the appearance of stock and provides a failsafe backup
>>> fueling sys if the electronics take a dive. Have any of you done anything
>>> like what I've described? How did it work?
>>
> 
>> People are using The base plate and then building CNC horns to ride over the
>> top of the BP. I'm wanting to use the whole carb as the air door and horn.
>> The carb would be Fully functional except for the lack of fuel supply.
>> 
>>> 
>>> Well, you set the idle like you would with the carb, thing is, erichment is
>>> done by the ECU.  For high idle air, you'd run a calibrated vacuum leak, aka
>>> air solenoid.  The ECU then bleeds air during the warmup cycle.  Ge a
>>> normally
>>> closed solenoid and it's all the same.
>>> 
>> If I Understand correctly the dead stop idle would be set with the normal
>> adjustment made with the idle screw on the side of the carb (opening the
>> butterflies). But the fast idle air would be regulated by an ECU actuated
>> solenoid. At that time the ECU would also enrich the A/F mixture to
>> accommodate the Fast idle condition (in traffic, in gear etc). You've
>> mentioned a solenoid which is normally a simple ON/OFF configuration without
>> fine adjustment. Is the the optimal configuration? I would much prefer a
>> finer adjustment that just on/off if this is possible.
> 
>> That's where PWM IAC control comes in.
>> 
>>> 
>>> Do you have any recommendation for specific part #'s you like for the Air
>>> solenoid and TPS, in this case?
>> 
>> Check the MS FAQ or the SDS efi website.
>> 
>> --Perry





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