Tudor

Hello All,
My name is Tudor, I'm from St. Petrsburg, Russia.
I'm designing a "track day" roadster. What I have now uses Hyabusa engine with 180hp and 180lb complete with 6 speed geargbox. This allows for a very light (~1000lbs) and seriously fast car. How ever it has it's drowbacks
1) Engine revving that high (10k+) is not overly reliable
2)One needs to learn to drive such a peacky engine - no torque at lower RPM
3) Some people love but some hate dog style gear box
4) Overall - not everyone is really ready to drive something that feels and drive like a pure race car - comfort is non existant.

So I thought that I need a version with automotive engine. After some looking around I felt in love with this little rotarys (13B REW).
Now correct me when I'm wrong
Light and compact (don't know exactly but "rumors" say that it's not much over 200lbs)
Not very hard to get - lots of engine bulders listed that offer rebuild engines with 24000miles warranty
Lot's of power even in stock form (255hp)

Now here's the list of questions I have - please take a look and may be add a word or two. Any help/advise will be highly appriciated.

1) Is RX7 (3d gen) gearbox available same easy as rebuild engines? If so what is price estimate? How much does it weight? Same questions apply to diff.
2) Most engine builders quote engines without neccesary ancillaryes - what is needed for 13B TT, how easily available?
3) ECU: Is original available? I have expireance with motec M800 in a touring car I used to race - great thing but seriously expencive. There are AEM, TECi and Haltech - all at lower price. What would you say about them?
4) Engine wiring harness (original) how easily available? where?

5) Does anybody have a CAD model of 13B TT so I can put it in my chassis CAD model?

6) Sorry for this one. "average" street porting - how much power/torque? At what RPM?

7) This one is not any better - sorry guys. Which engine builder would you suggest in terms of providing complete service. Deliver worldwide - engines complete with wiring harness, ECU, Exhoust (developed together to clear the chassis etc.) reasonably priced and reliable garanties? Who has enough knowledge to work on something less usual? Thought nothing special if one remembers that rotarys are used in many classes in SCCA. So there must be a lot of expireance using them out of RX7s...

8) First project is front engined so it's possible to use stock tranny. Next one will be my true love - mid engined project. So does anyone aware of some transaxle ( non dog style) that is possible to use with mazda rotary?

Thanks a lot for your help. Sorry for my English - I never was first in class

Thank you
Ted

nevarmore

Well since you need to know, I'd be happy to act as a rotary consultant for a small fee. Hahah. Seriously though, why come to us? This is a club, we all have some experience with rotary engines but why are you asking amatuers for your buisness needs?

1) 3rd gen stuff is readily available.
2) No different than a piston engine. Water pump and alternator are the bare minimum, with power steering, vaccuum pumps etc as needed.
3) ECU's are as available as any other part. Read the forums for opinions. Take those opinions with a grain of salt, as they are opinions. I'm sure for your application the aftermarket ECU makers would be happy to provide you with technical information.
4) See 1) and 3). In your application with fewer accessories, make your own. You don't need an entire harness.
5) By and large you're going to pay through the nose for a CAD model. Probably from Mazda due to Japanese, American, and EU copyright rules.
6) Depends on how agressively you want to port it. Search for 'streetport dyno' and you should find what you need.
7) The big names that us amatuers use all have some sort of racing programme. RacingBeat, Hurley, CP Racing. The big one is if you are running a carbureted engine, in which case go to Sterling.
8) I don't. I'm sure someone here has at least attempted it. You may also want to try tapping the 787b programme from Mazda for info. The 787 was thier LeMans car.

Don't sweat the english. You did a much better job than a lot of the native speakers on here.

cpa7man

iTrader: (2)

Contact Dave Lemon at Mazdatrix.com. He will have all your answers. Or a smaller shop like pratherracing.com. These guys are busy right now as the SCCA runoffs start next week.

Great english btw....


edit:l'd probably run a large streetported 13b or 12a with all the nice bits. They will run a lot longer than a 13brew.

Tudor

Thanks a lot guys.
I desided to ask first in forums as:
1) You're not trying to sell me something
2) To get some even if not too extensive knowledge before I contact any business.

I don't think that this is that tough with CAD models really. People do share and exchange models. For example I made accurate (dimensions and weight) Penske shocks model and gave it to my buddy and he gave me brake calipers model. The list go on. There are copyrights issues but I feel that it's not as tough as in some other areas. Correct me if I'm wrong.

On reliability issue... It's not THAT important as this type of car is never or let's say VERY rearly used as everyday drive.

Thank you
Ted

Tudor

Cpa7man,


edit:l'd probably run a large streetported 13b or 12a with all the nice bits. They will run a lot longer than a 13brew

How much I should expect from large streetported 13b or 12a?

Thank you
Ted

cpa7man

iTrader: (2)

I know the SCCA guys with the 12a "street port" are getting close to 200 rwhp. Remember this is a full race motor. Both of the shops I mentioned above can build such. The 13b's get more but I'm not as familiar with them for race applications. I'm thinking with a "street port" around 230+ rwhp, but I'm told peak power is around 10000 rpm where the 12a makes peak power at around 8600rpm. The 13b has greater rotational weight thus wears out faster, but has more power.

If you search there are a bunch of guys racing the 13brew in the 3rd gen making gobs of power safely. With proper mods this can be done. Do know that they are rebuilding every season or two. Most SCCA racers are getting 2 full seasons on the 12a, less on the 13b.

Tudor

Thanks Cpa7man

Ted