The Kraftwerks Rotrex supercharger kits for the 01-05 Miata are shipping now
A/C & P/S
P/S & non-A/C

The production non-intercooled kit makes SAE corrected 165whp/142 tq on CA91 on only 5psi. The intake charge is so cool that no timing retard is needed. We typically see no more than 120° IAT, even on the dyno. Extra fuel is provided by the PnP Kraftwerks Super Card controller. CARB approval pending.

The highly compact Rotrex supercharger is nearly silent. It's patented traction drive system allows the compressor wheel to turn 9.49x as fast as the input shaft without the drag or noise or traditional gears. Peak compressor speed on the C30-74 supercharger unit is 120,000 rpm and it boasts 76% efficiency. The unrestricted C30-74 unit flows 38lbs/min, enough for about 300whp if you want to modify or upgrade your kit later on.

The high compressor speed allows the kit to flow a bunch more CFM at low boost, when compared to older technology 1:1 drive ratio centrifugal superchargers.

Kit comes complete with absolutely everything you need to install. No permanent mods to car required, no oil pan drilling. Installation time for a pro mechanic is usually about 2 hours. No dyno tuning needed. Plug it in an peel out.

Complete info on the 949Racing website




99-05 1-2 weeks out
94-97 3-4 weeks out
complete intercooled kits, coming late 2009
Intercooler upgrade to base kit, late 2009
Non-P/S, non-A/C kits coming this summer

 

Dyno chart coming in a few days.

 

Should mention that the kits are available without ECU for those that have their own management solution.

Working a big tube header specifically for the Rotrex. Off the shelf RB and Jackson headers make more power than stock but to once you strap on an intercooler, the engine wil want 1.625 or even 1.75 primaries and 2.5" collector. Header will comes towards the Fall. Prototyping stages now.

 

 

Why cheap out in a nice kit and put worm clamps on the charge pipes? Otherwise it looks well put together.

 

At the modest 5psi boost level this kit runs, worm drive clamps have proven more than sufficient. Remember, this thing isn't something just put together last week. We have been daily driving and track testing this thing for like two years. Expect a very high level of refinement and driveability.

The high boost kits coming later will use a different, constant torque style clamps.

 

The 99-00 kits are ready! Making the same power as the 01-05.

94-97 kits are in final calibration testing now. Hoping to start shipping those by the end of July.

I/C upgrade development is done. Going into production for the brackets and hardware. My guess is August. The only leftover part from upgrading a current base kit to intercooled is the one crossover pipe and swapping for a bigger inlet restrictor. Sweet!

 

 

Ill trade you a tri-pod for one of them superchargers.

 

You should see my drift videos. Dramamine not included.

 

May I give some advice?

Put that huge wheel onto the miata kit.

Thanks!

 

Backwards. That'll slow it down.

The OEM 4 rib crank pulley is a 130mm. The standard ATI 6 rib supercharger pulley is 148mm. Base kit has an 88mm 4 rib nose pulley. The one going onto the OGK is an 85mm 6 rib and will be paired with a 148mm ATI damper/pulley. That on a 7000rpm motor should move enough air for about 230whp. When I get around to building an 8500rpm motor, we'll be somewhere in the 250~280whp range I think.

Yeah, I know, every pushes for stupid high boost. We pretty much have the hierarchy planned out so owners will have a cost effective upgrade path to about 230whp with off the shelf parts and a stock engine. Beyond that would require pulling the restrictor and a higher RPM bottom end.

For the guys that are going straight to the track, we recommend starting with a 6 rib race kit and skipping our intake piping, ECU and injectors. That top race kit is essentially what I have so its effectively the prototype for that level. Focus now is on getting the low boost intercooled and NA kits ready.

 

I think the kit is a great although the price is a little high for the entry level imo. But I like many on here are cheap and diy to the death. I have more fun building a car than driving it.

Will the kit at all bolt to a 1.6 if you were to swap on 1.8 pulleys so that it uses a 4 rib belt?

 

Nope.

 

Video of dyno run of 5psi base kit making 155whp

 

Just got back from the dyno with Bellwilliam's car with a Kraftwerks Race kit (6 rib). Modified Racing Beat header (3" collector), 3" exhaust, E85 fuel, RC550's @ 90% DC, 60psi fuel, Adaptronic, 10x14x3" I/C, otherwise stone stock 99 engine.

240whp/212tq on 9.8psi corrected. William is very happy!

It wanted to make about 280whp which is a bit too much for a stock engine so we pulled almost 10° timing and added .5 points too much E85 to soften top end power. We also used an inlet restrictor about half the size of the compressor inlet. Very low EGT's with E85. Made about 20hp less on 100 race gas. Very safe tune now with the E85.

His car uses the same C30-74 Rotrex that comes with the NB base kits. Have to load the run data into the viewer to make a plot file I can display here. Will try to get that posted by Monday. Its matching the stock torque peak at about 1500rpm and holds over 200ft lbs from 4000-6000rpm.

Race kits available now, contact us for pricing.

 

The KW1 base kit makes about 160wp on an NB. The KW2 intercooled kit coming in a few months will make about 180whp. The parts that make the KW2 will be available as an upgrade to those that already have KW1's. To go beyond that you'll need bigger injectors and additional engine management that we will develop in the KW3. That kit is still probably 4-5 months away so no price or HP figures yet. The C30-74 used in the base kit will make 280whp uncorked which is way too much power for the stock bottom end so we'll hold it back to about 210whp in the KW3 most likely. Those KW3 kits will be PNP but tuned very conservatively.

Track Dog Racing is planning an intercooler upgrade for the KW1 that they will likely have ready before our KW2.

Alternatively, one can now also order a YouTune kit which is sort of a starter for a DIY build. You provide engine management, tuning, intercooler, pipes, hoses, etc.

 

Emilio,
I am very interested in a 4 into 1 header with a 3" collector. Been trying to get someone to build one for my nitrous car.

 

You're on your own there. William's header is a nasty looking thing he had his semi-talented neighbor welder kludge onto an innocent RB header. Nothing we plan on putting into production. Not the right way to increase flow and velocity.

We just complete our big tube stepped header for the Miata. A few more tests to run then we'll release it. Price TBD.

 

KraftWerks Rotrex Race kit prototype on E85 - MX-5 Miata Forum