KW C30-74 Rotrex Supercharger Kit! - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Miata parts for sale/trade Buy, trade or sell your Miata parts here.

Closed Thread
 
 
 
LinkBack Thread Tools Search this Thread
Old 03-30-2014, 11:53 PM   #1
Destroyer of Inconel
Thread Starter
iTrader: (37)
 
EO2K's Avatar
 
Join Date: Apr 2010
Location: In ur driveway, abusin' ur WPA
Posts: 9,642
Total Cats: 954
Cool KW C30-74 Rotrex Supercharger Kit!

Up for sale is my "Gen1" Kraftwerks Rotrex kit for a 99/00 Miata.

The kit was purchased in April of 2011, removed from the car in August of 2012 due to CA Smog requirements. It's been sitting in a bin in my garage ever since. The whole kit has 4,000 maybe 5,000 miles on it in total.

The Basics:

This is a RESTRICTED KIT with NO INTERCOOLER. It includes a DFC piggyback fuel controller that is set up for a stock 99/00 BP4W Miata and will work with NOTHING ELSE. The kit was ordered for a car WITH AC & PS and that's what the belts are sized for. If you run this on something without one of those options, you may need to do some legwork to figure out appropriate belt length. The kit as delivered makes about 7~8psi depending on weather and I believe it was originally rated for 180 or so hp in this as delivered "bolt-on-and-go" restricted configuration. There is definitely room to grow but I'll get into that later.

The gen1 kits had some teething problems due to belt alignment because of poor idler design, but I've corrected those issues with my kit and replaced or upgraded appropriate parts to solve the problem.

Once the belt issues were dealt with, I did:
  • 4 autocross events
  • Sat/Sun back-to-back track weekend at MRLS in the rain (wet belts anyone?)
  • Full trackday at Thunderhill including 500mi round trip w/trailer
  • Several thousand miles of DD and aggressive backroad hoonage.
...all on the same belt. I consider the belt issue I experienced to be resolved.

This kit is as complete as I can make it, but see the list after the pics for stuff you will need to source on your own. I even have the stickers, licence plate frame and printed instructions that were originally included. I made several improvements to things such as the "fixed idler" guide and replaced all the worm gear clamps on the positive pressure side with stainless T-Bolt band clamps. Info regarding these modifications (and a shitload of other Rotrex tech) can be found in my "build thread" in the Supercharger Section. In fact, I strongly recommend you read that thread so you understand what its taken to get to this point.

I was told by the folks at Kraftwerks that this hardware "should" fit any Miata 94-05 as long as it has a 1.8 engine in it, but the DFC piggyback fuel controller is ONLY good for the NB1 aka 99/00 Miata. You get the DFC with the kit whether you want it or not. (You should get a Megasquirt anyway)


Time for pictures!


Pile o' parts


Printed distructions


Idler, tensioner, blower pulley detail.


K&N Filter comes with free dirt!


Oil system and mounts, plus another angle


Rotrex Oil Cooler, I used simple "through the core" transmission cooler mounts rather than the overly complicated ones provided by Kraftwerks.


DFC Piggyback Fuel Controller and Mount on the left


Compressor wheel in all its glory (grey goop on inlet is glue from the restrictor)


Restricted for your pleasure


Inlet


Outlet


Original box no less!


This end down you fool!


Bosch re-circulation valve


Fits conveniently in a bin for storage.



Ok, What else will I need to buy to complete this kit?

  • Rotrex Specific SX150 Traction Oil.
This is not "optional" or "recommended" oil, this is REQUIRED. Buy it here: https://jacksonracing.com/shop/rotre...raction-fluid/

  • New Rotrex Oil Filter
You could probably reuse the one I've included with the kit, but why be a cheapskate? Buy it here: https://jacksonracing.com/shop/rotre...ex-oil-filter/

  • New Hydraulic Oil Lines
The old ones had to be sacrificed but these shouldn't be difficult to find as they are standard R6 Hydraulic Hose. Get fresh hose from Jackson Racing or your local hydraulic parts shop.

  • New Sparkplugs with a higher heat range
The NGK BKR7E is what I ran most of the time and it worked great



So what is all this going to cost me?

Asking price is $2,500 obo


Tuxedo kitty can't believe this deal either!

Note: Before you go lowballing me, remember this thing has less than 5,000 miles on it and a C30-74 head unit sells for $2,200 brand new. I've been sitting on this thing for nearly 2 years and its not like its going to go bad sitting in my garage.

I'm in California near the Bay Area and near San Jose. Local sale is preferred and cash is king. I'll be posting this up on NorCalRoadsters sometime later this week as well. I'm willing to drive a couple hundred miles to meet up if you are halfway local. Shipping costs would be covered by the buyer and I warn you, this is not exactly light or compact. I would not be comfortable putting it all in one box. Please don't as me for a damn shipping quote because its not packed and I can't get one yet. Paypal is accepted but buyer would be responsible for fees. Kit is being sold AS IS so don't come after me if you can't figure something out or you blow up your shiza.

As you can see I'm not some 12 post n00b selling random parts with potato pics and no description. I'd consider myself a known quantity and I'm here for the long haul. I'm not here to rip anyone off or make enemies so I've tried to represent everything as accurately as possible.

If you have any questions or would like more info/pics, post up and ask away and I'll try to get back to you ASAP. I encourage you to ask questions here in the thread so I don't get spammed with PMs and don't have to bump things on my own

I know the forum likes to **** up posts with multiple pics, so here is the link to the lot of them on imgur: imgur: the simple image sharer


Beyond the basics:

As with any production supercharger kit, solid gains can be had with the addition of:
  1. properly sized intercooler
  2. larger fuel injectors
  3. wideband
  4. programable ECU
  5. smaller blower pulley
  6. a solid tune

The redline on the C30-74 head unit is 120,000 rpm. The 88mm pulley that is included with the kit spins things up to around 104,366 rpm if you have a 7,200 rpm engine redline. That is only 86.97% of the C30-74s rated speed. With the restrictor removed, the 88mm pulley is capable of making somewhere in the neighborhood of 225hp with appropriate tune and supporting modifications.

Here on MiataTurbo user Mobius wrote up a great DIY parts list for adding an intercooler to a rotrex kit. It so easy even a caveman like me can do it!

A smaller 80mm or even 75mm 8 rib pulley is available from URD Motorsports: Underdog Racing Development. Even though the Kraftwerks kit is 4 rib, there are plenty of reports that they work just fine with the revised idler and tensioner setup, provided you use the correct ribs. Going SMALLER than 75mm is NOT recommended as this will overspeed the blower.

The C30-74 blower is actually rated at something like 300hp from the manufacturer so its definitely got some headroom. Unlike a roots or a positive displacement blower, this thing wants to spin, and it wants to spin MOAR. Also unlike a roots or PD blower, its not much for low end torque. The Rotrex does its best work on a roadcourse from 4-5000rpm and up. Unless you really like to wind it out on the street, you may find the performance uninspiring for day to day stuff. I thought it was a hoot but that might just be me.

If this is so awesome, why are you selling it?
I need money for the last of my turbo goodies, plus my car really REALLY needs some paint



If your car looked like this, you would sell your unused supercharger too.
Attached Thumbnails
KW C30-74 Rotrex Supercharger Kit!-ec55x3x.jpg   KW C30-74 Rotrex Supercharger Kit!-uhgsm3x.jpg   KW C30-74 Rotrex Supercharger Kit!-ufsq100.jpg   KW C30-74 Rotrex Supercharger Kit!-fnvje0r.jpg   KW C30-74 Rotrex Supercharger Kit!-fbuy7pq.jpg  

KW C30-74 Rotrex Supercharger Kit!-qkofu9x.jpg   KW C30-74 Rotrex Supercharger Kit!-ynokpbt.jpg   KW C30-74 Rotrex Supercharger Kit!-gkmapv8.jpg   KW C30-74 Rotrex Supercharger Kit!-21qkiwi.jpg   KW C30-74 Rotrex Supercharger Kit!-pgpkqva.jpg  

KW C30-74 Rotrex Supercharger Kit!-nd3s2j9.jpg   KW C30-74 Rotrex Supercharger Kit!-eqytlpg.jpg   KW C30-74 Rotrex Supercharger Kit!-qdxrswi.jpg   KW C30-74 Rotrex Supercharger Kit!-t7psi9u.jpg   KW C30-74 Rotrex Supercharger Kit!-u8n5slc.jpg  

KW C30-74 Rotrex Supercharger Kit!-qhmm47j.gif  
EO2K is offline  
Old 03-31-2014, 01:43 AM   #2
Elite Member
iTrader: (2)
 
Mobius's Avatar
 
Join Date: May 2008
Location: Portland, Oregon
Posts: 3,176
Total Cats: 261
Default

A bump for the seller. I have the same Kraftwerks kit, which I have since upgraded to no restrictor, bigger injectors, 80mm pulley, and an intercooler.

There is no more reliable track day forced induction option. Period. Studs don't back out, nothing underhood overheats. It just works, and works well. I autocross mine, I track day mine, and I daily drive mine, and I would do it again.
Mobius is offline  
Old 03-31-2014, 01:51 AM   #3
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,165
Total Cats: 2,573
Default

bump for legit seller

if he does end up shipping it, I feel bad for the person that will have to unpack it all : he packs in NUCLEAR WARHEAD PROOF packaging. lol
18psi is offline  
Old 03-31-2014, 08:19 PM   #4
Senior Member
iTrader: (2)
 
Join Date: Oct 2011
Location: SE NM
Posts: 1,458
Total Cats: 48
Default

Arrrgh in 3 months I could get this but I am paying down debt right now... GLWS!
Chilicharger665 is offline  
Old 03-31-2014, 08:49 PM   #5
Destroyer of Inconel
Thread Starter
iTrader: (37)
 
EO2K's Avatar
 
Join Date: Apr 2010
Location: In ur driveway, abusin' ur WPA
Posts: 9,642
Total Cats: 954
Default

I'll make a note in my calendar to PM you

Thanks the the bumps guys!
EO2K is offline  
Old 04-01-2014, 03:54 PM   #6
Junior Member
 
Join Date: Nov 2009
Location: Central Coast C.A
Posts: 89
Total Cats: 7
Default

Bump for Seller, Good Guy ...
but needs a Paint Job BAD!! Ha ha JK
Gordon dont be jacking up my car now either since you know where I live!!! Actually I want to paint mine too, we should see if we can get a deal somewhere..
jcmusmc00 is offline  
Old 04-02-2014, 07:45 PM   #7
Senior Member
iTrader: (4)
 
Join Date: Nov 2012
Location: Colorado
Posts: 743
Total Cats: 46
Default

Is the tensioner is the same for PS/AC vs. not having those- only change is belt length? The kraftwerks website is worthless...

I might be interested
dcamp2 is offline  
Old 04-02-2014, 07:51 PM   #8
Destroyer of Inconel
Thread Starter
iTrader: (37)
 
EO2K's Avatar
 
Join Date: Apr 2010
Location: In ur driveway, abusin' ur WPA
Posts: 9,642
Total Cats: 954
Default

As far as I know, that is correct: It's just the belt length. Or at least that's how they were sold when I got mine. I think I actually have the PN for the no ac/no ps belt somewhere but it'll take some digging so no promises on that.

Good news! I'm interested in selling

Where are you located? Nevermind, just saw SoCal. Whereabouts? It might be worth meeting halfway somewhere.

Last edited by EO2K; 04-02-2014 at 08:50 PM.
EO2K is offline  
Old 04-11-2014, 02:45 PM   #9
Destroyer of Inconel
Thread Starter
iTrader: (37)
 
EO2K's Avatar
 
Join Date: Apr 2010
Location: In ur driveway, abusin' ur WPA
Posts: 9,642
Total Cats: 954
Default

We be pending mon, irie
EO2K is offline  
Old 04-11-2014, 02:47 PM   #10
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,460
Total Cats: 782
Default

Post your second gear results in this thread for this moron:

NB 6-speed Real World top speed in 2nd gear? - MX-5 Miata Forum
concealer404 is offline  
Old 04-11-2014, 02:49 PM   #11
Destroyer of Inconel
Thread Starter
iTrader: (37)
 
EO2K's Avatar
 
Join Date: Apr 2010
Location: In ur driveway, abusin' ur WPA
Posts: 9,642
Total Cats: 954
Default

Did you perhaps intend to respond to my build thread?

I haz 5 speed & 4.1 in the car currently

Edit: No, I'm not going to post in that thread. I've spent enough time arguing with potatoes at work today that I don't need more of it on m.net
EO2K is offline  
Old 04-11-2014, 02:56 PM   #12
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,460
Total Cats: 782
Default

Yes, yes i did. I'm not sure what the **** happened, because i'm pretty sure i didn't even open this thread until now...
concealer404 is offline  
Old 04-11-2014, 03:40 PM   #13
Newb
 
Join Date: Jan 2014
Posts: 18
Total Cats: -5
Default

Interested, # is 772 486 1985. Let's talk
SamMK1 is offline  
Old 04-11-2014, 03:40 PM   #14
Newb
 
Join Date: Jan 2014
Posts: 18
Total Cats: -5
Default

Interested
SamMK1 is offline  
Old 04-11-2014, 03:40 PM   #15
Newb
 
Join Date: Jan 2014
Posts: 18
Total Cats: -5
Default

What is best way to reach you?
SamMK1 is offline  
Old 04-11-2014, 03:56 PM   #16
Destroyer of Inconel
Thread Starter
iTrader: (37)
 
EO2K's Avatar
 
Join Date: Apr 2010
Location: In ur driveway, abusin' ur WPA
Posts: 9,642
Total Cats: 954
Default

Hi SamMK1. Thanks for the interest but I've got someone else who's made a commitment at the moment. If it does not work out in the next 10 days I'll look you up.
EO2K is offline  
Old 04-19-2014, 09:21 PM   #17
Destroyer of Inconel
Thread Starter
iTrader: (37)
 
EO2K's Avatar
 
Join Date: Apr 2010
Location: In ur driveway, abusin' ur WPA
Posts: 9,642
Total Cats: 954
Default

Thanks for the interest, we are sold.
EO2K is offline  
 
 
Closed Thread

Related Topics
Thread Thread Starter Forum Replies Last Post
Need help - Stock Balancer and Fastforward overlay pulleys Frank_and_Beans Supercharger Discussion 13 09-12-2016 09:17 PM
MP62 maintenance Pist0n Supercharger Discussion 3 10-10-2015 05:23 PM
Noob to Miataturbo from MA JxPhan Meet and Greet 3 10-02-2015 03:17 AM
New M62 Miata owner Pist0n Meet and Greet 4 10-01-2015 09:18 PM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 01:17 PM.