Mazda Rotary MX-5 Miata Conversion Kit

mr_rotary · Postby **mr_rotary** » Fri Mar 14, 2008 10:15 pm

Quite pricey however good to see there is something available:

http://cgi.ebay.com/ebaymotors/Mazda-Rotary-MX-5-Miata-Conversion-Kit-13B_W0QQitemZ180199789928QQcmdZViewItem?hash=item180199789928&_trksid=p3286.m20.l1116

Schultzy · Postby **Schultzy** » Sat Mar 15, 2008 5:14 pm

Just a pipe dream at the moment but would be great to put a 13B in the MX...... went down to the boys at Mazfix the other week and was told they can do it but is not legal in QLD. Anyone confirm this?

If it was possible to get it engineered and road worthy here in Bris, I'd take the car off the road today :lol:

Schultzy

Postby **orx626** » Sat Mar 15, 2008 5:24 pm

Schultzy wrote:Just a pipe dream at the moment but would be great to put a 13B in the MX...... went down to the boys at Mazfix the other week and was told they can do it but is not legal in QLD. Anyone confirm this?

If it was possible to get it engineered and road worthy here in Bris, I'd take the car off the road today

Schultzy

Schultzy, the only legal conversion is using the current model RX-8 13B which on paper will suit all MX-5's NA-NC, however the RX-7 FC (series 5) naturally aspirated 13B is OK for NA's between 1989 and 1991. The allowable displacement calculator (LA1 Option 3 - Modification code) doesn't allow the installation of either RX-7 FD (series 6) 13BTT or FC (series 5) 13BT. 12A's are way too old!

Cheers,
Danny

Schultzy · Postby **Schultzy** » Sat Mar 15, 2008 6:48 pm

Cheers buddy you've given me new hope :lol:

Was planning on upgrading to a BP and going turbo in my NA6 but have always wanted to go the rotary route after owning a couple of RX7's before the MX. Will be expensive but an interesting combination with the Renesis.

If you find any other usefull info on the topic, let me know

Schultzy

Postby **orx626** » Sat Mar 15, 2008 7:19 pm

Schultzy wrote:If you find any other usefull info on the topic, let me know

Schultzy

What would you like to know? I'm happy to answer any questions on the subject.

Regards,
Danny

Sean · Postby **Sean** » Sat Mar 15, 2008 8:13 pm

There is a way to put a turbo 13b in an \"MX5\" legally, but it's not a simple route and technically i'd be a eunos roadster...

The engine rules are based on a calculation based on the cars body weight. For Australian delivered cars this means the body weight listed on the RTA's (in NSW or similar regulatory body in your state) system. This means that you can't say teh car is heavier now cause you've added lead, or a bigger diff or accesories. This is the ruling orx626 is talking about that prevents you doing it to your current car.

The solution.

Find a nice Eunos in Japan, import it and comply it in Australia. Now is the tricky bit, you need to probably be friendly with the importer to manage this...

On teh import documentation make sure the car is put down as having a weight that allows you to add the desired engine (in NSW 1050kg will let you go 20B turbo :shock:

). That weight will be listed as your car's weight with the RTA, you may need a weighbridge certificate to show it actually weights that, so stock up on bags of concrete.

The fact the car is an import means it doesn't ft into the standard weights that teh RTA use, so they use your import weight. WIth your new heavy MX5/eunos, you can go to an engineering signatiory, and the RTA and get your new turbo rotary powered MX5 approved.

Feel free to point out any flaws in my system, but I know there are at least 3 turbo 13b \"MX5's\" that have been done this way, one was in NSW, I cannot recall the location of the other 2, but I have a feeling one was a Qld based car rego'd in NSW.

JBT · Postby **JBT** » Sat Mar 15, 2008 8:18 pm

Sean wrote:Feel free to point out any flaws in my system.....

Seriously

Import document falsification is probably a good starting point. :shock:

Postby **orx626** » Sat Mar 15, 2008 8:26 pm

Sean, there's plenty of ways to get a 13B turbo registered in Queensland...just that none of them are to the letter of the law

. End result is that the Approved Person who signed off the vehicle runs the risk of prosecution and can/will lose their certificate to operate for Queensland Transport.

Regards,
Danny

Schultzy · Postby **Schultzy** » Sat Mar 15, 2008 9:33 pm

Is there a process that i can go through to get the car engineered correctly and legaly with a rotor? For example, Bullet mx5 with a lexus 4L blown V8 are legal and compliant, can i go down the same track or is that they are classed as a different car altogether?

Schultzy

Postby **orx626** » Sat Mar 15, 2008 9:46 pm

Schultzy wrote:Is there a process that i can go through to get the car engineered correctly and legaly with a rotor? For example, Bullet mx5 with a lexus 4L blown V8 are legal and compliant, can i go down the same track or is that they are classed as a different car altogether?

Schultzy

Anything is possible...how deep are your pockets! It cost Bullet 10's of thousands of dollars to comply that vehicle.

Our only hope is NCOP - http://www.infrastructure.gov.au/roads/safety/bulletin/pdf/NCOP3_Section_LA_Engines_3Feb2006.pdf....when the state governments finally decide to adopt it!

Cheers,
Danny

Schultzy · Postby **Schultzy** » Sat Mar 15, 2008 10:09 pm

Nice find and seems like a pretty fair system.

A little off topic after reading through it though.... if i wanted to swap out the B6 with a BP, do i have to use the NA8 BP or can i use the NB BP without an issue as the NA had an option of a 1.8 from the factory?

Slowly learning hehehe :lol:

Cheers

Postby **orx626** » Sat Mar 15, 2008 10:20 pm

Schultzy wrote:Nice find and seems like a pretty fair system.

Unfortunately its not new...this thing has been evolving since 2000!!

Qld Transport have hinted that they may adopt it this year....I'm certainly not holding my breath. :!:

Schultzy wrote:A little off topic after reading through it though.... if i wanted to swap out the B6 with a BP, do i have to use the NA8 BP or can i use the NB BP without an issue as the NA had an option of a 1.8 from the factory?

Slowly learning hehehe

Cheers

You can certainly swap the B6 out for a BP (NA or NB)....the main thing is that the replacement engine is no older (emissions wise) than the engine its displacing. ie. You couldn't replace a NB BP with a NA BP unless you retained all the NB emissions gear.

Cheers,
Danny

Sean · Postby **Sean** » Sat Mar 15, 2008 10:35 pm

JBT wrote:
Sean wrote:Feel free to point out any flaws in my system.....

Seriously Import document falsification is probably a good starting point.

It doesn't need to be falsified

You can pick up a car with full options and some heavy mods that will easily meet the weight requirements for 13b Turbo before the engine swap - No dodgy or false documents.

If you wanted to get to the 1050 region for a 20b, yeah some dodgy documents would be required. Oh for clarification, the cars I mentioned earlier were all 13b, with legal approval, the NSW one has been through full RTA inspection at the RTA station.

Other (costly) option would be to build it as an ICV, Extremely hard and expensive to get it to comply though, as it would need to comply to ALL of today's standards.

Postby **orx626** » Sat Mar 15, 2008 10:44 pm

Sean wrote:
JBT wrote:
Sean wrote:Feel free to point out any flaws in my system.....

Seriously Import document falsification is probably a good starting point.

It doesn't need to be falsified

You can pick up a car with full options and some heavy mods that will easily meet the weight requirements for 13b Turbo before the engine swap - No dodgy or false documents.

If you wanted to get to the 1050 region for a 20b, yeah some dodgy documents would be required. Oh for clarification, the cars I mentioned earlier were all 13b, with legal approval, the NSW one has been through full RTA inspection at the RTA station.

Other (costly) option would be to build it as an ICV, Extremely hard and expensive to get it to comply though, as it would need to comply to ALL of today's standards.

So you would need documentation to show that your Eunos Roadster has a kerb weight of no less than 1046.4kg to allow you to install a 13B turbo. Quite an investment if someone in the NSW RTA has half a brain and questions why this Eunos Roadster would be 100 odd kg heavier than the other ones that are already on their system. Yeah it'll probably get processed at that weight because they're not that diligent. :lol:

Cheers,
Danny

Sean · Postby **Sean** » Sat Mar 15, 2008 10:56 pm

No disrepect, you seem to know your stuff, but 100 odd kilos is not hard to find with only very basic mods.

You could make half of it with a big heavy wheel and tyre combo.
Add in all available factory options like hardtop, PS, AC etc and you have another 25+ and you're getting VERY close.

**Edit, the 1050 I mentioned above is for a 13bt and is (in my humble opinion) achievable, it's the 1600 odd required for a 20bt that is unreasonable to achieve legitmately.

So yes I beleive 1050 for a 13bt is acheiveable in a non dodgy way.