[DeTomaso] efi horse power gain

gow2 at rc-tech.net gow2 at rc-tech.net
Tue Aug 11 11:19:57 EDT 2009


It's how a lot of people do it. It works.

It was plumed on my Hall intake but I did not want to use spacers for the
400. I made some drawings and had some plates cut from aluminum. I am
going to weld up my own intake. Plates are ready to weld but I need to
finish paint first.

Gary

> Jack,
>
> I have no idea how each cylinder's vacuum pulse can cancel out each other.
> That
> means one pulse would be negative (vacuum) and the other positive
> (pressure).
> Something seriously wrong with that engine!
> Logically, the vacuum from each cylinder should be sequentially
> additive until the
> plenum value reaches steady state at a given engine rpm.
>
> Whatever the case theoretically, with individual vacuum tubes from each of
> my throttle bodies attached to the central plenum, I do have a
> manifold pressure.
> The ECU uses this as in input and I see the values change as the rpm
> changes
> when I monitor the engine functions. So it does work.
>
> I suppose one could argue that it doesn't react fast enough
> instantaneously to
> be a 'good' input to the ECU. That's why TPS can be another input. As with
> all
> computer control systems, the more information, the better the control.
> I am assuming that the algorithms and programming are 'correct' here!
> ;-)
>
> As a side note, I only use the #2 cylinder throttle body as a vacuum
> source for my Pantera
> brake booster. I was told this was not possible and would never work as
> there
> would not be enough vacuum. Darn it, it inexplicably works with no drama.
>
> :-)
>
> Later,
> Kirby
>
> On Tue, Aug 11, 2009 at 1:43 AM, <JDeRyke at aol.com> wrote:
>> In a message dated 8/10/09 6:51:47 PM, kenn_green at yahoo.com writes:
>>
>>> By pulses I just meant when an individual intake opened, but connecting
>>> all the runners to a common chamber sounds like that issues is
>>> addressed
>>>
>> Ken, when I tried that for vacuum advance on IR-manifold Webers, I found
>> the individual pressure pulses from one cylinder cancelled the next
>> cylinder's
>> vacuum pulse out so the average vacuum in an 8-tube vac manifold was
>> zero.
>> Maybe there's a way around this but I never found it. Good luck- J
>> Deryke
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