TC, I somehow know you would call me on this one ; ) ...yes I should clarify
that I'm not saying the opening of the V-boost valves creates the dip but
having the V-boost operational does. IMHO the carbs don't triple load as bad
with the v-boost valve open at lower rev's. Generally 4-5K appears to be
when the positive exhaust wave hits on Max during on open exhaust valve.
With a stage 7, jetting is typically rich already for lower rpm's. Having
intake air pulled then pushed then pulled through the carb due to a positive
exhaust wave (and valve overlap) creates a very rich induced flat spot. A
closed v-boost valve allows higher velocity through the carbs and more fuel
will be drawn in. The open v-boost valve provides a plenum to reduce the
effect... I have made the observation that open ports seem to have the
smoothest torque curve at rev's lower than the v-boost opening.
But
Terry
-----Original Message-----
From: TC <[EMAIL PROTECTED]>
>Terry,
>At 58 mph ... in 4th ... he is turning 4300 RPM ... and you can see a
>"little" dip on the other runs as well ... but all are out of the dip
>at 70 mph, (which is 5200 RPM) .......... It didn't have enough butt
>to get the slides opened up .... with S7 and the Vboost closed ...
>With them open all the time ... it uses the pulse from the other side
>to kick the mixture in .... IMHO .. this dip would not have been as
>pronounced on the Stage 7 - normal Vboost run if they would have given
>it a little more needle ...... This is a frequent complaint on initial
>Stage 7 installations ... "sneaking up on 4500 and hitting a flat spot
>... the zoooommmmm" ... which is fixed with more needle, (or
>apparently with open Vboost tubes) ....... very interesting ......
>IMHO ..... Go ahead .. beat me up ... do you agree ??
>campbell
>
>----- Original Message -----
>From: Terry and Pat Hayden <[EMAIL PROTECTED]>
>Subject: Re: Stage VII and V-Boost
>
>
>> I don't have the web page done but Scott Mellor's dyno chart is at:
>> http://www.geocities.com/MotorCity/Speedway/2476/scott.jpg
>>
>> It is interesting to see how the V-boost causes a dip on the stage
>7. This
>> is fairly common judging from some of the other S7/v-boost dyno's
>posted...
>> snip <
>
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