Keith Tanner
Flyin' Miata
keith@flyinmiata.com
http://www.flyinmiata.com
1-800-FLY-MX5s (orders)

1-970-242-3800 (tech)

Keith,
I need more info.  below you state "it should open up" I have to be

absolutely certain it remains open if the belt breaks and the charger stops.

The other statement, " might close again", what would cause it to close

again? A cycle of the throttle?  Explain please..

"The engine will run" as in normally aspirated?  Or would there be a

significant decrease below normal non-blown power.  Of course if it's not
supercharging then of course it's not going to have the

same as it did while it was blowing but I need to know if there is any

significant decrease below normal power without the blower functioning.

In other words if I'm getting 180 hp at 8,000 rpm without the blower

running will I still see the 180 when it stops or less?

Is there any more information and pictures or drawings of this

supercharger that you can provide or lead me to?

Thanks again in advance, Vaughn.

Vaughn Mann wrote:

Thomas,
This question was sent to "FlynMiata" about the Supercharger they are

offering.  The question asked was concerning the "Free Flow"  concern if a
belt was to break. See response as replied so far.

Latest reply Thomas,
Vaughn.

The bypass valve is not designed to be the sole source of air for the
engine. It's fairly small in diameter (39mm) relative to the throttle plate
and it goes through a hard 90 degree turn. If you break the supercharger
belt, the bypass will not flow enough air to allow the generation of 180 hp
at 8000 rpm, for example. You will be down on power. The car will be
drivable but it will not be equivalent to a stock car.

The bypass opens when the diaphragm sees a vacuum relative to ambient. At
full throttle without the supercharger running, the diaphragm will see
ambient pressure and the bypass will close. If the bypass signal line is
plumbed in to a source after the supercharger, there may be enough vacuum to
keep the bypass open. It's not something I've spent a lot of time studying,
honestly. If you are entering competition and are concerned about what
happens when the belt breaks in the middle of a corner at the limit of
adhesion, I'd recommend regular inspection of the belt.

The supercharger unit is a Whipple 1200AX. Some drawings may be seen here:
http://www.whipplesuperchargers.com/images/productimages/compressors/1200ax_comp_lg.jpg .
We do not use the extension on the nose of the supercharger.
Keith Tanner
Flyin' Miata
keith@flyinmiata.com
http://www.flyinmiata.com
1-800-FLY-MX5s (orders)
1-970-242-3800 (tech)

-Vaughn Mann wrote:

If you have a properly installed bypass, it should open up with a broken

belt. It might close again at full throttle and the car will definitely be
down on power, but the engine will run.

-Vaughn Mann wrote:

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