Interesting indeed.... But any links or pictures of this would be most helpful!

 

Can i just say thats beautiful and sexxy ... AND I HATE U FOR IT... I WANT ONE

 

i met a guy that ran the VR4 twin type set up on an evo. he started by running the twin 9b's that they have stock, then upgraded to twin 16gz which on a vr4 is enough to hit low 11's 20gz will get u 10's as proven by my friends vr4. this setup is entirely possible on our cars with a custom manifold and intercooler set up. if anything for ur rear mounted turbo set up just run methanol to supplement the intercooling instead of a complicated 2 inlet intercooler

 

There's alot of work in doing dual charging.

The subie and Grand Prix guys have it, although its not all that wide spread.

The best way of doing it is to have one charging device set for low rpm and another set for high rpm.

If you didn't have to worry about a turbo spooling until 6k rpm just think of how large of a turbine housing you could run on it. Now think if you are spooling it with a supercharged engine that gives you even more exhaust force so you can make it that much bigger.

Now that you have a super huge exhaust turbine you will create alot of extra horsepower in the upper end.

This is one of the great things of "dual charging". If you actually want to go with twin charging, that's another story, semi's do it when they need to run 60psi or so. Crazy stuff, nothing for a gas engine to deal with.

 

Twin turbo kits for the Evo will be available from RC Developments in the UK fairly soon:

http://www.lancerregister.com/showthread.php?t=193196

 

It sounds like a sequential system which is totally different than what I have planned. He already stated that he needed to lose the power steering and AC for this. I am planning mine with no compromises. No lost space under the hood, just a big ol turbo where the muffler was.

 

Since I have a TT G35 I was thinking about if the engine was moved to the middle and the VSR intake manifold would incorporate two TB's the TT system could bolt up.

 

have you made any progress with this so far?? im really intrested in it and would love for it all to work. can you outline the basics (like piping routes and pos turbo sizing) that you are looking/thinking of using??

Cheers

Chris.

 

Design a manifold to route 2 exhaust into a small turbo then the other 2 into a big turbo. When the large turbo spools at 6-6500rpms, have a check valve of some sort to bypass the smaller turbo.
Then make a true dual exhaust all the way out the back, or route them back together.....

I don't know the mechanics of turbo charged engines very well but I am basing this from a BMW 335i's inline 6, they route 3 and 3 to each turbo (if i'm not mistaken), figure why not the 4G63 in 2x2?

 

the BMW 335 engine is a twin turbo. they use to totaly seperate turbos. this is differant to what Evotech and RC developemnts are trying to do.

the hot side isn't really a problem as far as plumbing gose. you just need to make sure you have enough waste gate to bypass the stock turbo and not restrict the rear turbo.

the cold side piping could be a problem. you could just run a compound boost dsetup. this is where you use a large turbo to move the large volume of air and then a second smaller turbo to really compress it to high boost presures. this is whats oftne used on diesels to get the super high boost presures they run. i dont think its really needed on an EVO.

so what you really want to do is total bypass the stock turbo once the rear turbo is spooling. agian hot side not a problem, BIG gate before the stock turbo so you can bypass enough/with little restriction the stock turbo, then a second waste gate at the rear turbo to ultimately contole the boost presure. but what about the coldside piping?? do you run two filters?? how do you stop reverse flow??

thanks Chris.

 

The filter goes right where the turbo is in the rear. There will have to be some type of check valve to prevent reversion.

 

Why not use a supercharger with a magnetically disconnecting pulley? The intertia of the superchargers rotors along with all of the boost from the big turbo would be sure to keep them spinning fast enough to not become restrictive?

 

its very difficult to twin charge/compound boost with a supper charger. i have seen it done on MINIs and some ford V8s but they ran the turbo straight into the back of the SC. the problem is you have to run higher boost presures to make the same power than the turbo only guys. with the tight mini engine bays they could run intercoolers aftger the trubo so intake temps to the SC where VERY high. this causes warping of the SC and premature wear. the ford guys did run a BIG FMIC but it still had to run more intake presure to get the same power. now with a well set up sequential turbo setup (ie a little turbo and then a bigger turbo) you should beable to get better results! its a trade off but i recon its less of a trade with turbos. also it should weigh alot less and be easier to package.

RC Delvopments here in the UK are coming out with a kit that will (and has on a recent dyno) give stock spool, but then just keep on pulling. now they have yet to release much info on this kit as they are still testing but when they do i will let you guys know. im guessing they are doing a similer thing to what Evotech is trying to do. if so then his idea might be cheaper/better/allow larger turbo or to keep PAS and AC. we will have to wait and see.

either way i think there will be some intresting things around the corner!

Cheers

Chris.

 

sequentials are fairly easy...draw air through large turbo into small turbo (choke flow won't be much issue as you then have pressure into the smaller turbo), exhaust first through the smaller turbine (with large EWG) and then have those flow into the larger turbine.

 

The whole idea behind this is to make it as simple as possible and keep expenses down. Putting 2 turbo's under the hood would sacrifice AC and power steering and probably double the price. I am not looking to make the fastest Evo in the world. My goal is to make 700 WHP without sacrificing anything like power steering, AC and most important spoolup. Fabrication will not start for a few more months. I am taking my time and doing all my homework first to try to engineer it right the first time. I would say I am 6 months away from a prototype.