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Best low-RPM HP/torque upgrades for Rotary?

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Niles Standish

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May 31, 2003, 2:59:05 PM5/31/03
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I'm looking at the RX-8, but what's been done with the RX-7 in terms of
increasing torque or lower-RPM responsiveness?


Amur_

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May 31, 2003, 10:59:12 PM5/31/03
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Niles Standish wrote:
> I'm looking at the RX-8, but what's been done with the RX-7 in terms of
> increasing torque or lower-RPM responsiveness?

Opening up the intake and exhaust helps a little, but ultimately if
you want to substantially increase the torque boosting (turbo) is the
only way to go...


ttyl,
Amur_

Ernesto Sanchez

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Jun 3, 2003, 6:02:12 PM6/3/03
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"Niles Standish" <rwa...@homail.com> wrote in message
news:ZX6Ca.5356$eF6...@news2.east.cox.net...

> I'm looking at the RX-8, but what's been done with the RX-7 in terms of
> increasing torque or lower-RPM responsiveness?

Supercharger.


Niles Standish

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Jun 3, 2003, 8:32:22 PM6/3/03
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Is there a twin-screw model available for the rotary?

"Ernesto Sanchez" <res0...@gte.net> wrote in message
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First of One

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Jun 3, 2003, 11:36:47 PM6/3/03
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Incidentally, one type of supercharger is a Wankel running in reverse...

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"Ernesto Sanchez" <res0...@gte.net> wrote in message
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The Raven

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Jun 4, 2003, 5:46:48 AM6/4/03
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"Niles Standish" <rwa...@homail.com> wrote in message
news:ZX6Ca.5356$eF6...@news2.east.cox.net...
> I'm looking at the RX-8, but what's been done with the RX-7 in terms of
> increasing torque or lower-RPM responsiveness?

If you're asking what lessons have been learnt from the RX7 that could be
applied to the RX8 I'd say probably very little would transfer over.

Mazda added various Dynamic Intake Effect (IIRC) that increased intake
charge and therefore gave better torque. Other intake and exhaust tricks
were probably applied but I'd suspect the improvement which yeilded the most
was EFI.

As for what *might* be possible:

Longer intake runners usually help low down torque.
Careful porting can also help.
A carefully chosen exhaust system (which would have to be dyno proven to
know for sure)

In summary, I think you'd find that the Renesis engine has had just about
every trick thrown at it. You'd be unlikely to make much more torque without
either trading performance off or resorting to expensive turbo or
supercharging.


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** since August 15th 2000.


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