Will the kit be available for NA8?

89-05

No updates on ETA. Best guess is the first application (probably NA6) will ship February-March with each of the 3 remaining applications coming a month or so after the other. Pricing target still around $4000-ish.

Any idea if these blowers play nice with an exhintake mod?

Not tested. In general, centrifugal superchargers respond to the same mods as a normally aspirated build.

That mod would only benefit the Rotrex. You would want adjustable cam gears to dial in overlap and IVC to best power with the Rotrex.

I run cams slightly more aggressive than yours and my car is quite happy! Almost 300whp on E85.

I am currently running a NA8 with exhintake and it works fine... not sure how much power it's worth, but I already had it installed.


My car stays cool on track for 30 minutes with a Trackspeed rad and coolant reroute. I've been very happy with the Rotrex for track use.

Emilio, you should obviously just pick up my setup and make a twin screw kit instead. ;-) 200 ft-lbs from 2500 to 8k on pump gas! :)

I'm happy with 200 lbs from 4000-8000 at about 10psi. Since we installed it and ran about 10 hrs on track and daily driven for a few months I have had to:

-Check the engine oil level a few times

For laughs, we could swap the production C30-74 on it for the optional C30-94, bolts right up with two new silicone connectors. No other changes and we're at about 420whp, 300lbs torque from 3500-8000 at around 12psi. But that's far more power than I need for this particular project. I'm sure as soon as the JR kits are released, someone will build a stout 1.9L with good head and cams for a C30-94 and hit those numbers. It's silly easy.

I toyed around with the idea of installing a C30-94 but I feel like I am near the limits of the trans and diff with current C30-74. At some point you gotta say enough is enough and be happy with what you got. I plan to spend more of my money on track time next year. I do like the sound of a 400whp winshield delete roadster on the street though.

Yup. C30-94 invites trans failures. The 74 is the sweet spot I think.

Any updates?

After I sorted out my suspension (Xida FTW), I can't wait to get my hands on this kit! Any updates are greatly appreciated :)

Asked in the other wrong thread. On a 1.6 is the rotrex kit still the best power/dollar option? Assuming the BP 1.8 swap and normal build is already going to be a couple thousand total? How easy will the rotrex kit allow you to increase the power on a 1.6 above the CARB stock kit levels?

Remember the difference between power/dollar and torque/dollar. Unless you're on a track or driving like a toolbag on the street, centrifugals won't make your car feel much faster the vast majority of the time.

True, I autocross mostly so torque probably would be noticed more than power. I actually don't street drive that much and only do a couple track days a year.

Still a good idea. Realistically though, your 1.6 probably has low compression if it is the original motor. If so, don't bother rebuilding it. Drop in an NB engine instead.


Speed/dollar, this wins. Based on direct personal experience. Have you extensive experience with Rotrex builds on track cars?

Personally, deviates 300whp felt ah, plenty fast even putting around on the street. No it didn't have 250lbs at 3000rpm but it also had zero TPS/torque lag at any rpm, didn't fall off or require a single touch after initial installation for the 30 or so track hours we beat on it.

Having around 175lbs instantly available pretty much off idle makes it feel like a mini Z06. The key here is the instant part. No revs, no waiting, just tip in from a light and pulls like very healthy 3.0 V6.

I like the character of my NA6, I would just like that character with more power where it actually starts to feel like a fast car.

Does Oscar have these posted on his own site or will distribute via 949? Just wondering how they compare to the kraftwerks/whatever it was stuff from a couple years back. I believe with those kits only the 99+ motor was dyno'd up to 200whp I just wondered how actually limiting the 1.6 is since I know Ryan was making 240 on his turbo 1.6

20% less engine means 20% less everything. Look at the dyno plot, it just feels, sounds, drives, pulls like a much bigger engine. You don't hear or feel anything to let you know it's F/I other than a little whoosh or muted chirp hear and there.

Here in the US, we won't build, dyno or experiment with the 1.6 beyond the CARB kit. We will leave that to customers.

Is there a posted dyno for the 1.6 kit like from "Sugar" or anything?

Not yet. There will be when the kits are released in a few months.