The ULTIMATE GUIDE To Deciding if Rotrex Is Right For You. 

Great video Greg! It's surprising how little videos there are geared around the rotrex, that LHT video is like the only one that has a teardown and internals and even then it's not detailed enough on the disassembly to replicate. Some things to note from your video here, you mentioned how close virtual dyno was to the actual dyno results (3ish HP), I'm sure you did data logs while on the dyno and since you have the exact HP for the pull you could play with the input data of the app to read the exact same outcome essentially dialing it in so your street logs would be an exact representation of what the Dyno results would be. IDK if the Dyno is able to record boost pressure for the display off of a vacuum line from the engine but that would have been a great data point along with AFR to go with the HP and torque reading. Looks like you were dealing with something on the top end... even in the final Dyno pull there is a dip then climb right before redline. Curious if you pinpointed the cause? what is peak boost 11psi? AFR target? Total timing at peak boost you got away with? One thing you mentioned was TDR was able to make a bit over 300WHP on this same size blower with stock engine BUT you are running the blower at max RPM and got 260WHP, I would guess that was on better fuel but what else would have been done to get that result over what you got?🤔 Maybe PS and AC delete? IIRC you already have a lightweight flywheel and looks like lighter wheels also (less rotational weight on the motor). One last bit of relevant info is the Rotrex oil system has a max temperature of 80c or 176F. For anyone pushing the blower past it's RPM limits you will want to go overboard on the oil system cooler and possibly a second reservoir. There are some builds running the blower as much as 20-25% over spin and get away with it by keeping the oil temperature in check. I would love to see someone spray water/meth (high pressure atomization/small CC, 70-100% mix supposedly works well) into supercharger inlet and see the effects in boost pressure and gains on the dyno. (aquamist, prometh, and usually sideways rally team offer the nozzle holders).

TDR Please give this man the means to make a fully in depth breakdown of the install of one of your kits.

love that mic lmao

Both Gingium and Korg pumping out miata content today, feels good man

Miata Dad's back and this time with a 30 minute video! Time to get the popcorn🍿

I have a crazy built motor and Rotrex setup. Over the past 2 winters we have turboed 2 other cars, an NA, and an NB. We all track our cars. The Rotrex systems is much easier to keep cool on the track due to the fact that it does not create all the heat in the engine bay like a turbo does, and it does not put heat into the fluids like a turbo does. You do not need an oil cooler, and you absolutely will if you want to track a turbo car. You can see videos of all these projects on the youtube channel James Gang Racing. We are not as cool as Greg, but we have fun.

The Rotrex, twinscrew, and TVS series roots are about 75% efficient. Adding an intercooler improves efficiency, reducing the parasitic loss. The boost in a centrifugal supercharger like the Rotrex increases with RPM. A roots and twinscrew supercharger make a fixed boost at all RPM's, the roots doesn't seal as well as the twin screw, so low RPM isn't as good as the twin screw. In all superchargers, boost climbs as you near redline because the restrictions in the intake ports and valves (volumetric efficiency). The Fast Forward supercharger kit (also a weekend install) using the TVS900 roots can easily hit 300WHP with E85 (130mm crank pulley). It replaces the intake manifold, reducing the volume after the throttle, idle is easier to set (dual throttle bodies help with a hotside supercharger and large intercooler). It is also CARB certified for those of us in Kalifornia.

I like the centrifugal type supercharger, it feels more naturally aspirated and I feel it’s less stressful on the engine. Simplicity of installation is a plus as well, that and it’s less popular.

Appreciate all you do for the community 👍

Great video! I have been eyeing this kit for 4 years but haven't pulled the trigger on it since it seems like there isn't any recent info or reviews of it. This video answered most of the questions i had and i look forward to future videos from you on this kit, thank you as usual!

Your videos are excellent! You definitely deserve more subs.

Thanks for a great video! I have the TDR in my 99 Miata, it just makes you smile!

Great summary of Rotrex vs Roots vs Turbski, Grog! Love your deep dives. Keep on keeping on!

Nice video , great to see you using the ME442 👍

Just an absolute incredible knowledge share. Love seeing all of the data/charts to back everything up. I kinda want a SC now 😂

This was a great explainer with regards to the safety of the way the torque comes on with the rotrex

Thank you Craig 😅. Great video as always. Super informative.

Great vid!!!! I was def thinking of going this route and we'll, you just might have topped the scales. Haha

I would like to add that: 1. Turbos ALSO add parasitic drag on engines... & 2. The linear\ascending torque curve of CFSCs saves gas at low RPM(where - unless you're towing - high amounts of torque isn't necessary)... LOVE this project!!! 🙂 P.S. Whilst watching this video, the idea, to use the Blow Off of the SC(in this case)to move air across a radiator & or intercooler to aid cooling came to me...🤔

Went through all the same questions from people when I had one of the first rotrex supercharged S195 mustangs. You did a great job with all the explanations. Will be switching from an MP45 to the rotrex this fall on the race car.

Great video! I would be VERY interested in a full install guide

Huge thanks to the miata dad for another excellent video as always, very informative yet entertaining!

Been waiting for this vid. Thanks!

Always inspiring Greg! The main thing I learned about this is how easy it is to tune and how it’s almost a set-it-and-forget-it type of boosted application. Seems very low maintenance.

I just put the smaller rotrex with an 80 pulley on my miata and it’s insane fun. Would definitely recommend

15:06 so what you're saying is that you should install both a centrifugal and a twin scroll supercharger for low end torque and top end power. Noted

Thanks for answering my question. I also shared your video on my Instagram. The BOV sounds quite different compared to a turbo setup. More a fan of the closed setup.

Miata dad coming in with the facts as always 👌 love the nerdy details you always provide. That throttle response is insane 😎😎

I've been dying for this content. I'm planning the same rotrex on my nb2 swapped '94. Thanks!

This might be the best video you’ve ever made. Well done.

Hey, I’m appreciate you teaching us how all these things work for free of charge. I’m not financially stable to go to work/learn for something I’m passionate about and you make my dream come true. I appreciate it. You’ve earned my sub and notification

Great job as always mate!!!!!

Nice video and love the BP engine.👍👍

Great video as always

Wow. Thanks for this. Super informative! That throttle response is hilarious!!! 😂😂 yep, because rotrex is always on boost all the system has to do is close the gate and you have max flow at that rpm.

Heat management on track is just as bad as a turbo track car. I had to do every off the shelf cooling mod to mine. I could get 2-3 laps on a 2.0 mile track before needing a cool down lap, on a hot 90+ day. That was 10 years ago, after just slapping on the c30-74 kit on an otherwise stock miata. Now with the c30-94 and a built motor, all the cooling mods are still doing the job well.

Awesome video on the rotrex!

Fantastic work 👍

I learnt a stack from this video. Thanks Greg.

I couldn't quite tell in your video the height of your oil reservoir in relation to the oil inlet and outlet banjo fittings on your Rotrex. From what I have been told, the Rotrex oil cooler and reservoir need to be below the banjo fittings. Great video and very informative. I have a Rotrex on my RB25de NEO and it made it come alive!

I love this build!❤

I definitely preferred the recirculated dump way more than open dump

We need Dragy numbers! 😜

Linear boost is a cool part of a supercharger. No boost spikes, creep etc like with a turbo. You want to adjust boost? change the pulley size.. though after a certain point the air it spins heats beyond the intercooler and causes it to not gain as much (diminishing returns) and belt slip.. COG belts are best. But, like with everything, how do you want to tilt the curve at 5252? Torque or hp? Perfect world you'd want both. Hence what Volvo did with twin charging. Turbo for higher RPM hp and roots for Low end torque.

Put the same TDR setup on my ‘02 Miata. I removed my driver’s side fog light to send more air to the oil cooler. There was no one within 150 miles who tuned MegaSquirt in my area, so I went with the TDR Fuel/Timing cards, essentially a piggyback.. I dont recommend it. It runs much too rich when putting around town and fouls plugs left and right. At least, that was my experience. Definitely go for the standalone computer if you have the ability to properly tune it.

Great video as usual. I still prefer the Powerdyne set up I currently run on my 1998 NB. However, I picked up another 1998 NB for $450, they are cheap here in the UK, and might pop the Rotrex I have on my shelf into that one, this video has helped convince me.

I love that your trying all the different power mods on these.. So can you please make a Honda J swaap video... pls.

Super educational and creative as always! Won't be able to see a turbine again without angry eyes..

really nice results! Next time, see if you can use a Miata dipstick to hold the mic Bob Barker style. …without breaking it.😅

I love these informational videos. Keep ‘em coming! Also are you attending the Miata reunion at Sonoma?

We've been waiting for this video! Our rotrex is famous! Really happy to see it live on with you! We're excited to see you enjoy it as much as we did!

@18:45 I believe the TDR kit uses fuel/timing cards. You don't need to tune it if you don't want to. Another factor that makes it much more simple.

The man says "his 2 cents" while being a freaking bank, keep it up Greg!!

Love the allergy medication background bro! 💪😏 Is that Claritin?

Damn good content!

Where you start to blow out rods is high torque. So for stock form for high power this set up is really good for reliability.

That wrench! 🤣 Love it!

i do not have a miata, but if im not mistaken rotrex makes a kit for my car, lol you will probably laugh but its a stock 2007 honda fit. thank you for all the info and answering these questions you are appreciated.

One question I haven't seen: how is fuel mileage compared to NA/Turbo? Seems like that Rotrex is sapping lots of energy even when not pushing it.

Car looks great! I am near the end of my TDR install. What are the sizes for the turbosmart bypass valve and what we’re your concerns with the one provided by TDR?

Great comparison to NA, turbo, and roots SC. Can't say I've ever seen someone give such a good comparo, regardless of the car.

Great video as usual , I'm just going to keep my cars stock😂

I would love an install vid!

Amazing breakdown of rotrex supercharger option! Just wish it was smog legal for us here in ca...

Those are phenomenal numbers tbh, like right on par with a 2554 or 2560 and most your heat is managed with the external cooler and res vs. The turbo setup pumping it back into the sump and creating a large buildup of heat right next to the motor/brakes. Maybe my next miata goes SC lol

Whats next? I would love to see a NC or ND, that or something beyond the miata? Would love to see you try out new things!

The Flyin Miata guys say these are less reliable than the turbo setups but honestly I really love linear power instant response and that sound. If i ever do a forced induction kit I think I need to experience a supercharger.

Very intresting video, can you please tell me about the cover on your dash to stop that annoying sun glare you get that reflects on the windscreen :)

Very weel sound !!! I would like this in futur whit m'y progressif nitrous system.

Yaasss!!!... Dad's back, & he has stories how to best My NB...Rotrex in My future 🤔

I was always interested in the max power output of stock engines. I think it's really interesting the see what each engine can handle on stock internals. And especially as a low budget guy i can appreciate an engine that can make power without expensive mods. Personally i'm a SAAB guy and there is one dude who made 666 horsepower on a stock 2 liter engine back in 2009. There used to be a web page with all the details but has since been lost. Fortunately waybackmachine archived the post and has all the dyno charts and most of the pictures of the engine assembly.

Segment around 14:00 Super appreciate the perspective. For me, I'm all about daily driving and I've never been a fan of screamy, high-revving engines. Sure, it's fun when you bash around a track, but for daily driving, I'm almost never over 5k, unless I'm blasting off onto a freeway or something. So for me, the choice of a roots was WAY outweighing the rotrex. Rotrex/Turbo undoubtedly is the king of horsepower and king of high rev power. I'm just no that kind of driver though.

very cool video grog, but when does the NB get a Maruha stroker kit?

Shattered oil pump gears? Why you calling me out greg! Love the video, keep the content coming!

Very nice vid! Thanks! Btw you can tune the rev limiter in ME so that it's more gentle and spread over wider rpm range. so let's say instead of cutting power hard at 7500 it can do it gradually from 7k to 7.5k disabling more cylinders and cycles. Feels much nicer too. You can get it to almost where it seems that you lost power instead of bouncing :)

I've got a supercharged nc and i can confirm one of the best decisions ive ever made

Greg, one thing to note with a metal intake like that is that it conducts heat a lot better than the silicone/ plastic one that was in there before. Granted that intake is close to the exhaust I don’t know if that’s the best option

Love rotrex superchargers. The Koenigsegg ccx uses 2 of em. I want to do a v8, 10, or 12 with twin c32-94s.

I want that car, it looks like a fun track car 😊

Craig, weren't you having the same ignition/signal loss issue @ around the same rpm with the turbo red miata in a previous video?

Love that spoiler, where did you get it? ❤

Daddy's back baby!

We missed you

Whyyyy do you do this to me, ive just bought all turboparts for my nb, and now ill have to go rotrex too! Looks so nice and easy to install!

I have a noobie question: are we using the terms blow-off valve and bypass valve interchangeably? which one to put on a m45 twin screw supercharger build?

I originally wanted to turbo a Miata, but considering the Flyin Miata kit I want has been out of stock every time I've pulled up their site and the throttle response advantage of a supercharger setup, I'm starting to lean towards a centrifugal supercharger

That tensioner is looking pretty weak, it shouldn't be bouncing. LOVE YOUR VIDS!!!

Hey pal greetings from the UK For a track car would you recommend the same set up as you or going down the Itb high lift cams route? Best wishes pal. You helped a lot of mx5 owners here.

I love this channel and the info that you give us :)

fk yeah new car passion video!

They do seem really ideal, but the main question Instill have is how long do the charger units last. I have heard such conflicting reports and nothing definitive. With the cost of them you would want to get it right. Sounds like managing the air flow would be really important esp on track. Do they typically come with some way of monitoring the gearbox oil temp?

Any day that Greck uploads is a good day.

since the rotex dont ad anny exhaust restriction but ads boost into the engine wont that make the back pressure in the exhaust higher? idk what manifold/exhaust you got on the car but it sounds great

I have a fully built BP, can’t decide if I want supercharger or turbo yet, it’s a track build

How does passing emissions work now that you have an aftermarket ECU and a supercharger? You can’t just stick the oem ECU back on and have it work, right?

Hey man, so, I’m a 370Z owner with a C38R Rotrex kit making over 550whp on 93oct. Just fyi, you can actually control boost on the Rotrex supercharger. I just don’t know if Miata’s have the tuning capability for it. I assume they would. But… I use ECUTek on the 370Z. Just need a mac solenoid and connect the vacuum/boost reference to an open side of the EcuTek and you can use the BOV as a boost control. So it’ll bleed off excess boost pressure when boost goes above target boost. It’s kind of wild.

What we need next is a rollbar and 4point harness install on your nb and a 30min pov of ,,wheeeeee pfffff, wheeeeee pffft"😂

17:18 This is the point that I feel a lot of people are missing. And I'm not saying turbo is better than superchargers, but sometimes people don't fully understand the difference.

My ND2 needs one.

U intrigued me from my slumber 😂