I was looking at the JGTC website the other night and got to wondering. Does anyone know if the N/A 3-rotor that is in the GT300 class Rx-7 is a renesis design???

If so, I think that engine design would end up in the new Rx-7 if it is ever brought back. It just seems logical to use an n/a renesis 3-rotor in a 2800lb 2-seater with a six speed. Gas mileage should be as good as the rx-8 because of more torque and less weight....unless of course it was being flogged around town a bunch.

 

Isn't there some detail with the ports on a renesis being shared. Thus a 3 rotor being impossible with this port design? I swear i read this on here somewhere.

 

No. The engine in the RE-Amemiya RX-7 is based on a standard 20B. There is no 20B RENESIS, and there probably never will be.

I think the next step is to increase the displacement with two rotors, not add another one.

 

as an aside, at sevenstock i met the guy from RE-Amemiya (yes, one of them came just for sevenstock). he was a real nice guy, and he personally has both an FC and an FD (i can only imagine what they're like!). i talked w/ him for a bit and asked him about campaigning RX-8's in JGTC. if he understood me correctly (i don't speak japanese), and i think he did, it sounds like they really like the 8 and may gradually phase to racing 8's in 3 or 4 years or so, which means they might do some racing development on the RENESIS...or maybe they'll just stick w/ the 20B derivatives

 

Yeah. It's going to be a while before the RENESIS can successfully outdo current rotary engines. Hell, even JIC's D1 RX-8 uses a 13B-REW for competition. I also heard about RE-Amemiya wanting to campaign a JGTC-spec RX-8. I wonder what that would look like. People in the United States, such as Speedsource, are campaigning RX-8's in Grand-Am competition, and winning.

http://www.speedsourceinc.com/

 

the rx-7 in gt300 class is running a 12a carbed periphial port

 

HUH?

Since when? They were running a 20B NA on a FD.

 

Re's jgtc car is na/ 20b with 9.7:1 rotors.... Its no screamer though, rated at a paltry 325 ps in hyper rev....Max

 

Of course it's no screamer. It's only supposed to have a max of 300 hp. That's what GT300 is. If it were up to 500 hp it would be in the GT500 class.

 

Exactly, doesn't make enough power to be in the 500 class....I question though why they wouldn't just use a 13b for the 300 class..Max

 

Because they want the torque that a 20B offers over the 13B.

Now whoever mentioned the Renesis 20B not being possible due to port sharing. I'm not familiar with what you were talking about. Could you tell us some more about that and why it wouldn't work? Thanks in advance.

Zach

 

Why would there be any problem with haveing a 3 rotor Renesis. I don't see anyproblem with there. The side exhuast ports wouldn't make that much of a difference.

 

I don't think its the torque at all, 325 hp at 8000 rpm, and 230 ft/lbs @ 6500 it is no stump puller either, RE's own Gt and time attack cars make more peak torque at lower rpm's with 2 rotors, RE's current daily driver makes more power.... Its got to be something to do with weight penalties or other sanctions,for forced induction or , which makes the trade off worth while, in the end.. They know how to build n/a 3 rotors over there, we saw one that makes 680 hp, we also saw a 13b n/a put down 342 at the rear wheels, so its doable in 2 rotor form, can't find a full rule set of Jgtc in English on line though, only basics...
Are the skylines, 300z's, and supra's running n/a? I recall hearing that the supras run the mr2/celica mill instead of the 2tgz?
Another interesting note, it uses 3 piece 2mm seals in that motor... strange choice for a hi rpm peripheral port, must be another rule thing..Max

 

They are not running the Supras with the 3SGTE engine anymore, and I don't remember if they used to run on GT300 or GT500.

Nowdays, there are no Supras on GT300, there are some Celicas\MR-S, running the 3SGTE single turbo.

On GT500, the Supras run a 3UZ-FE V8, NSX run a C30A V6 (DOHC VTEC) twin turbo, and nissan runs a VQ30DETT V6 twin turbo.

http://www.jgtc.net/index_en.htm

 

mmm toyota v8. sounds monstrous.... thats the one they use in the lexus vert isnt it?

 

Wait... I thought the supras had the 2jze motors??? I know they now use v8's in the supra and the 350z motor in the skyline.

 

There should be absolutely no problems with the ports on the renesis to make it a 20b. I think all you would need is a 20b shaft and an extra rotor, housing, and mid-plate. Voila a 20b renesis race motor and 350 easy hp (I would estimate).

Why tool and spend tons of R&D money to make bigger rotors??

 

The Supras used to run a turbo 4 banger. The engine was unreal. I remember reading some article on it in a Japanese car magazine. The engine could produce some insane hp numbers when tuned to 50psi. The magazine had said that they "keep the boost at a moderate 35psi." I always laughed about that part.

Zach

 

Yeah, the 3SGTE from the sw20/22 MR2 and st185/195/205 Celica GT4. Awesome motor- except that i cracked a piston in mine at Thunderhill last year. (93 JDM MR2) Still, one of my MR2 buddies is planning on mating one with a supra 6 speed tranny and stuffing it in a FD maybe.. Could be cool i think- almost as light as a 13b, plus the 3S he's running now in his MR2 is supposedly putting down 500 ponies at 30 lbs.. Fully built of course, with Tec3 and a huge turbo..

side note- my FD is finally gonna be out of the shop next week! woo hoo! (been 8 months)

 

Almost 100% sure that the Supras that used to run the 3SGTE engines, ran in the GT300 classification.

 

I remember reading an article about RE-Amemiya's street version of their 2000 JGTC car. It was a 2-rotor 13B-REW with 440 hp.



It's supposed to look like this, but in blue.

 

where would you get a renisis mid plate?

 

I guess they can go "Hitman's Style" and use a second stock center plate.

 

Sand cast one out of iron, then mill it flat and CNC mill the ports in it. Simple.

 

Simple if you have the tools.