Im sorry but what are you talking about?

 

Man, coming from the Miata world, where positive-displacement pumps are abundant, I take for granted the knowledge I've gained about them in passing (and from reading Corky Bell's book ).

Many, many iterations of supercharger kits have been tried on Miatas: coldsides, hotsides, intercooled, non-intercooled, Whipple/Lysholms, Autorotors, Eaton/Mangussons, etc.

One thing that people found is that the supercharger needs to be regulated by the throttle plate, blowing straight into the intake manifold, otherwise, you've just increased your throttled volume exponentially, which will cause all sorts of problems, including the fact that your supercharger will run full-bore against the throttle plate, as it's essentially wide-open and free to pump as much as it can.

A few people tried this back in the early days of PD Miata supercharging and found that they needed either giant blow-off valves to control the volume pumped by the supercharger, or a type of recirculating bypass valve, otherwise, your supercharger's going to blow off an intake pipe if you're lucky, or split your intercooler in two if you're not lucky (it's happened, and is now part of Miata forced induction lore ).

These bypass valves have pretty much been perfected on the current generation Eaton/Magnusson blowers. They are progressive, work off the cars vacuum signal (so as to give a very smooth transition into boost) and are now internal, as opposed to the old JRSC M45 kits for Miatas that were external.

So yeah, anyway, in the vid, BRP had the blower strapped to the belts but un-throttled (because the throttle was still in the stock location), so it was basically pumping as much as the revs allowed. Like Brant said, this was for belt alignment and pulley testing. According to the BRP forum, they're shooting for a running prototype next week.

 

Yes and most Miata owners aren't known for doing 7000 RPM clutch drops. It only took around 4k to break the tires loose when I had my Miata. I would assume, with the huge increase in low end torque, 7k clutch drops won't be necessary.

 

I wish you guys the best of luck, but for a few more $$$, Lovefab gets you lots more horsepower with considerably less boost. Superchargers just can't touch turbochargers when you factor in efficiencies.

 

And turbochargers sized for ~400+rwhp can't touch positive-displacement superchargers when it comes to liner power and torque delivery, responsiveness and low-end torque... (the Lovefab kits are tremendously cool-looking, well engineered, kits of course)

Guess it just depends on what you want. If you're looking for 450rwhp, then, yes, an MP62-based supercharged setup is the wrong place to look. If, however, you're looking for <325rwhp with gobs of torque and a very responsive throttle pedal, then you might be in line for PD supercharger.

As for the Miata guys not doing 7k clutch drops, no, I can't say I know a lot of them, however, I do recall a BRP coldside-powered Miata lunch an axle at the drag strip, launching at high RPMs and using drag radials. This would've been with ~200+lb-ft of torque at the wheels. I mean, when you've got a torque/power curve like this: http://brpforum.infopop.cc/groupee_files/a...%2FR4-Final.jpg or like this: http://flyinmiata.com/tech/dyno_runs/2.0_uber.pdf , there's not a whole lot of need to launch at 7k RPM. The S2000 will react somewhat differently, and the Miata is a much lighter car, but you're still gonna have more low-end torque than you know what to do with.

 

hmm 300 was made on a maita? got damn that is awesome power for such a little car. I can't wait and see what kind of power will this make on the S. Which type of blower was used on that dyno graph? The hotside they producing right now or the coldside ?

 

We used a hotside MP62 for the 300rwhp run.

 

damn I want to sit in that maita!!!!!!

what are the expected power gain using the hotside set up on the S?

 

The Hotside MP62 setup will be capable of more, but we will probably be limited to around 325 RWHP with stock compression and pump gas.

Brant

 

nice. so the advantage on running the MP62 blower on the hotside is that you can run a air/air intercooler set up correct?