I have had my 2004 RX-8 GT for about 4 months now its sweet car but am looking to get alot more power out of it...i am sort of waiting for the PTP Turbo too be released but want too build my engine properly so i wont have any problems with it....so my question is should i do anything too the internals of the engine before i turbo it? if so what exactly should i have done to it....this is my first rotary so i basically no nothing about the engine so all the help i can get from you guys would be appreciated....my total goal for the car is to get around 450whp and use the car as a every day driver.

Justin

 

Yea swap in a heavily modded LS1, that should be all the internal work needed to get 450whp.

 

To be honest it would be very difficult for you to get 450 whp out of even these kits. 400 whp will be about the limit. To build up the engine, I would suggest porting the engine, Racing Beat's Metering Oil Pump. Will definitely need larger injectors. If you have money to spend. Find a set of Ianetti's ceremic Apex Seals, the Racing Beat modified rotors, ceramic coat the internal of the engine.

 

Is it just me, or is everyone else seeing the same post over and over again.

You wanna get about 2.5 times more hp out of stock motor, safely for a daily car. You need to search the forum alot better first. This isn't a piston motor, you dont just slap a bunch of forged parts into it and aim for high numbers.

 

Hello,
I came from puerto rico this last january. I saw plenty of boosted rotors over there(including a couple 20b rx8s and resnesis turbos). I did see one carin particular that had 420whp on a factory renesis but this is pushing the factory engines limits. The car had this hp for a whole year without any breaks but I still wouldnt recomend this. what you could do is rebuild your engine with stronger Apex seals and then boost it to 16-19psi, with the compresion in the rx8 this will get you to the low 400 whp range and be reiable. If you really want to build it good(more money) install low compression FD rotors in place of the factory renesis ones, these combined with the right set of apex seals will be good for hp in the 600-700 range so this set up runing at 450 hp should be very reliable. Oh and the most important thing..FUEL MANAGEMENT, dont expect this to be done with an emanage blue, it just wont happen even on the strongest built engine. In PR they use the microtech but from what I understand the Interceptor X is essentially a micro tech that has been made to be compatible with the RX8's electrical system so it shoudl be at the top of your list of choices. If my engine brokeand I had to buildit, I'd go with the low compression rotors and be on the safe side.

Hope this helps.

Chris....Esmeril

 

All I have read indicate that this will not work due to side seal issues. Amemiya even stated they were having issues with this. More recently, I saw a post on here about using 13BT rotors. I can't see how this would work with the Renesis ports either.

 

thanks alot chris and fanman that helps me alot...money is no concern too me i got a wicked job and i like spending my money on my car:P.... i have heard ALOT of good things abouyt the interceptor x....is there any specific brand or type of apex seals you would recomend? also what about the other seals should they be replaced as well? were cud i get the FD rotors and will they fit a renesis?and what compression will that put me too? haha if these are stupid questions and i sound like and idiot its because im new with this stuff:P

 

I think the more important question is how did you come to 450whp? Do you really need all that power?

Also, if money isn't an object, then I suggest you go out and purchase coilovers and wider wheels/tires to handle all this power you are looking for.

Lastly, everyone has been pretty good to you in this thread. All of your questions have been answered so many times that it makes our heads spin. Usually, as a collective we just tell you to start seaching and doing your homework...and I guess that's what I'm doing now. Happy hunting.

 

The reason I wrote that is because several low compression renesis engines have been built and naturally I assumed that they were using factory 13b turbo rotors unless they machined their own. They could have been using some renesis specific low compression rotors instead(maybe racing beat) so I apologize if I made a bad recomendation. The point is that if you want high Hp and reliability you need more than just strong apex seals, you need to lower the compression. Good luck with the project.

Chris....Esmeril

 

Instead of custom made rotors and intake manifold and so forth, just go with a 3-rotor and be done with it.

 

There is quite a bit that you need to do in order to hit the 400+ hp mark. The first place I'd start is the last thing that most people think of. That's the cooling system. A high horsepower engine makes more heat. Start by upgrading the radiator. Mazsport also has a kit that allows the fans to turn on earlier. You can't make power for very long if you can't keep the engine cool. The next thing I'd think about is the fuel system. The fuel pump will need to be upgraded. You'll probably also need to upgrade the oil coolers.

Internally on the engine, it is going to be difficult. No 13B rotors can be adapted to the Renesis so lower compression isn't much of an option this route. You also can not machine the stock rotors to a lower compression ratio since the casting is too thin. The reason why the older rotors won't work is for a number of reasons. The first is that they do not have a cutoff seal on the side. You'll have a small amount of port overlap without it and that's what makes this engine so special. The rotors are also just ever so slightly narrower. You'd have to measure it to even notice. This is because the Renesis runs tighter tolerances to help keep carbon deposits down on the sides. The Renesis side and corner seals are also moved 2mm closer to the edges of the rotors than the 13B side seals were. This combined with the fact that the side seals in the Renesis are wedge shaped as opposed to the straight 13B seals and now you've really got issues trying to adapt them. It might not be impossible but it might also be easier to look into finding someone who can take on the task of custom casting and machining new ones. I've never seen anyone do it yet.

You definitely need to be able to tune it. The Interceptor can tune any setup you have so it is definitely a good option for engine management. Just have someone tune it who knows what they are doing. There are a lot of shops out there that own dyno's but have no clue how to use one properly or tune a car. They all deny this of course!

Internally on the engine you can have someone machine out the apex seal grooves to 3mm. You can also have Racing Beat install a snap ring gear to keep the gears in the rotors in place as well as locking the rotor bearings in. Currently the ring gears are just pressed into place and at high rpms they have a slight tendency to "walk" away from the rotor. The bearings are also just pressed in place with a small crimp to hold them. A small set screw can be used to lock them in place but someone needs to know how to do this. You can also send your entire rotating assembly off to be balanced. The higher the power or the higher the rpm's you want, the more critical this becomes. A small amount of port work can also be done to clean things up. You can't really go too crazy here and with forced induction you don't want to anyways. Too many people make the mistake of using too much port timing with forced induction.

Aside from that there isn't much you can do. You can raise the oil pressure a little bit by shimming the rear oil bypass valve. Of course as with anything use a high quality oil and filter. Don't worry about what people say, use a good synthetic oil such as Royal Purple, Redline, or Amsoil. Stay away from the rest. Redline makes a product to add to the coolant called "water wetter" which also helps in cooling so this is good to use as well.

The best thing to do to insure that you will have a fairly trouble free car with high horsepower is to get it tuned properly. Of course just as equally important is how you treat it. The more you beat on it, the greater your chances are for engine failure.

 

From what i rememeber Alex has 13b rotors in his renesis. Here, take a look... https://www.rx8club.com/showthread.p...1&page=4&pp=15

 

what is a 3 rotor worth and what are the specs on it? cause i have onyl heard oif the engine and i no nothing about it?

 

Try contacting thes guys: http://www.rotaryengine.com/productpages/4342engine.htm

They were very helpful in answering any qustions i had, they even sent me an email posted below:

Hello, and thanks for your enquiry. We are currently the only place we know of who is specializing in the RX8 upgrade turbo engines. The compression issue has not been resolved as we cut apart 3 rotors for this procedure and there is simply not enough material to drop the compression. Instead we apply a special ceramic coating to controll the rotor trmps. to prevent "deiseling" on hot spots. The apex slots are opened up to a specific depth to accomodate custom ceramic 2pc. 3mm apex seals. The rotors are then clearanced and fitted with special high temp. Viton o-rings and heavy spring kits. The end housings are lapped and the intake ports are ported and polished. We use hardened stationary gears with clearanced bearings and a new e-shaft. The rotor housings are replaced if you have more than 55,000 miles on your engine. If you want, you can even upgrade to one of our "new" engines and still submit your old engine as a core. All in all, the turbo ready engines we build are good for as much as 13.5 lbs. boost and are most commonly used with the Greddy turbo kits. We also offer a much better engine management system than the greddy E-manage. It allows for extra reliability and can do ignition timing mods as well. I have one customer running one of our engines making 335 HP at the wheels. He blew the origional engine when he was making 245 RWHP. Essentially, anyone using a turbo on their RX8 will sooner than later lose an apex seal so our engine upgrade is becoming a very popular thing to do before the engine blows. So far we have shipped 5 through mail order and done 4 in house with 3 more on our list this fall. Any further questions dont hesitate to e-mail or call us.

Sincerely, Adam Heyman

I hope this helps.

 

They will physically fit, spin, and make power. How long is the real question. I don't see the side seals living very long.

 

That make sence. I guess we will find out eventually. Do you think low compression rotors will come from some aftermarket manufacturer?

 

is the recall true....is there a recall on all 04 05 and sum 06 rx8 engines? or is this just a load of bullshit

 

true

 

so whas the deal witht he fd rotors will they fit and run in my car or is this just a bad idea too try cause if they fit and run well and are gunna make 450whp alost easier on my car then im gunna do it but if they dont then i will just go with the lightweights from racing beat and lower the boost a bit....so far what im going to start with is the cooling system for my car then do the internals and then the turbo kit so hopefully it will be sufficient and if the fd rotors are gunna improve that then i will go with them...im very interested in putting the fd rotors in my car so if u could give me the pros and cons of this idea that would be great but untill then ill continue searching for myself...like i dotn no the difference between the 7 engine and the 8 engine, is the 8 the same just without the turbos, like r the rotors the same?

 

You should do all the searching before you ask these if you want to go Turbo and even port with the RX-8. Learn everything about rotary 1st... and to answer ur question about FD rotors, no dont put them in the renesis, it can push serious power if you know what you are doing and have the $.

Use the search function on this forum, read thru the techie threads, if you want answers, respond to those threads, people will gladly help you, not many will reply to you if you start your own thread and start asking these questions.

Also, use commas and periods, and paragraphs please.
________
group Cam

 

If money isn't an issue and you want to make real power...trade in the 8 and get a ZO6 ..that is all