7747 spark control questions.

[rrauscher at nni.com]

I would get a bog when trying to pull out quick. Normal (?)
driving would be fine. It's a Performer RPM manifold with
no heat crossover, and a valley baffle. Runs cold. I knew it
neeeded a bit more pump shot, but did not want it to affect
the afr too much. I was still tuning the VE tables at the time.

I had no idea that it would want so much PS. Probably could
add more, O2 still dips a little on a quick throttle opening.

BobR.

>The early TBI 454 uses that biig iron carby intake, plus a heated
>spacer/adapter, plus the bigger throttle bores, and the whole darn
>thing runs hot enough to fry eggs.  Even the carb'ed stuff requires a
>little more attention to throttle opening speeds and fueling on those
>engines.
>
>Were you experiencing any other symptoms?  Just poor response?
>Shannen
>
>rr wrote:
>> 
>> Digression alert:
>> 
>> Ever see the pump-shot values in that bin? They are seven times the duration

>> of a 5.7l bin! (ARHT) To get a decent throttle response on my 327 TBI, I
split
>> the difference between the 5.7l bin and the ANTZ bin. I had originally added

>> 20% to the 5.7l bin, and it had no effect. I then added another 20%, no
>> effect. Finally did the above change. Worked!
>> 
>> BobR.
>>

>
>
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