I was bored, so I was thinking...I've seen so many of these after-cat kits for mustangs and corvettes and what not..why not try one for a 7? You don't even need an intercooler, and no turbos up under the hood baking out the engine bay.

The length of charge pipe that reaches from the rear of the car upfront runs along the bottom of the car and has its own intercooler effect so by the time it gets to the TB it's as cool as most any intercooler could make it. That pretty much cancels out any negative results from the slight pressure drop from the length of piping.

Plus the turbo intake air charge would be so much cooler..about as Cold-Air as you could get..though i know it doesnt matter much since its' gonna get compresed anyway but still. And since the 7 is a short car the length wouldnt be as dramatic as a corvette (unless my eyes deceive me.)

That and you could run pretty much open exhaust. Just use your stock 3" piping and nd get rid of your catback. Actually since the stock cat has that huge as area made for it just put the turbo where the cat would go, run the remainign exhaust just like you would normally, and run the charge pipe along the exhaust (with as much distance as possible and a heat wrapped exhaust pipe) up intot he engien bay and to the TB.

As far as oil goes they make pumps for it to go with existing kits out there. Either that or you could run something from the trunk like a closed oil container with a pump and a small cooler to go under the car somewhere.

Just a thought. any opinions on this would be nice just to keep me thinking

(You could also drop a set of stock non-sequential twins in there or BNR's to be extra sexy, and wastegate control wouldnt be any different)

 

If you run the turbine inlet after the cat, then you are going to have a huge temperature differential compared to what is actually coming out of your engine. Turbos use that thermal energy so a temperature drop like that would reduce the energy that the turbo can use.

Even if the compressor heats up the intake charge, the temperature of the intake charge is still very important.

Just because the charge pipe routing would be long, it doesn't mean that the cooling ability of a pipe would be better than a nice efficient intercooler that is made for heat exchange.

-Kevin

 

well ..i mean there wouldnt be a cat. i think they just refer to these system as after cat systems for the kits for cars retaining the stock exhaust system

 

I'm just pretty much saying use a normal downpipe, midpipe, catback. chop the midpipe and weld a flange for the turbo inlet and put the turbo there, and conect th rest of the midpipe and catback as normal. and run the charge pipes back up to the front. I dunno just think it would be neat, but the engine bay would feel sort of empty. better than the ridiculous heat sink the turbos would normally create

 

It could probably be made possible for the FD just as it is for the other cars you mentioned. But on the most recent kits like that for the new C6 vette I have seen them using an intercooler.

 

o i didnt realize they used IC's since i figured they didnt want any mroe pressure drop as it was from the long charge piping lol.

theres my crude sketch

 

I definitely follow what you are trying to do, and it's a neat idea, it just wouldn't perform very well.

 

Thats what they all said about those 5000lb GM trucks running 13's in the quarter with the rear mount turbo and >10psi boost. Go have a look at performancetrucks.net and ls1tech one day when you are bored and see what those guys are getting from their rear mount setups on trucks, camaros, vettes, etc.

 

search up "remote turbo". squires turbo systems seems to be heading this off- i think their twin turbo system for the '05+ mustang would be ideal to copy off of.

btw you can eliminate your mufflers because the compressor wheel absorbs a lot of sound.

Mustang- no muffler, twins



Look ma, no mufflers!

http://www.ststurbo.com/home

 

The main reason I don't like the idea is the ease of theft of the turbos....Get under the car, loosen a few bolts, & say bye bye to your turbos!

Easier than leaving a car on blocks.

 

I know it may not be a huge issue, but having my intake right behind a tire (mustang setup) that is kicking up all types of water and **** woud freak me out.....expecially if it is raining.


Man look at the piping that goes over the fender well on the c6!



I think it would be a bitch to change the air filter!!!


pretty cool stuff though,
-josh

 

STS twin turbos for Z06s make good power for Z06... but I just can't see it benefitting rotary 7s..

 

All in all, it's been proven that rear-mount turbos work. I've seen them installed on car shows on TV (Horsepower TV, Two Guys Garage) and they make VERY good power with VERY good response.

Could it work on a rotary? Maybe. I doubt anyone will spend the R&D time to set that up. It's kind of a pie in the sky question unless someone actually plans on trying it out. Packaging would be a problem on an FD - it's a small, tight car. Hell, I have problems finding spots for car stereo stuff, finding a spot in the back for an air filter, intercooler plumbing, etc. would be VERY tricky.

Dale

 

That's the real problem. The exhaust turbos were created for cars that don't have the room under the hood for FI. The FD has the room so it's not really a needed application for this car. Plus, people have issues dealing with exhaust fitments let alone trying to stuff a turbo back there.

 

lol yea, just a thought i guess. I have a feeling the Turbo's or a single could be packaged into the big *** cavity used to contained the stock cat though. never really measured its volume or anything but you could probably wrap a heatshield around it and everything to keep it safe. that and the underhood temps of the FD have always been a fatal flaw, and if the long piping could reduce the need for a large intercooler to where something the size of the stock intercooler would be sufficient it would resolve the need for alot of space-making mods in the front end like battery relocation or mini battery, radiator relocation, etc. plus it would sound badass to hear a turbo spool from under the passenger seat lol

 

you could go to meets and "claim" that your 2 rotor 7 is pushing 450-500hp with a NA set up hahahahahhaha

i like that idea though

 

With the turbo in the middle of the car like that you run the risk of baking the passenger cabin. Go talk to some vette owners with side pipes, on warm days the floor pans get so hot you can't even rest your feet on them. I was talking to a cobra owner (shelby cobra, not mustang) and he complained of the same problems, he even said the doors would get warm if the car sat idle while running for to long. And considering FD's are mostly used during warm weather, I could see that being a rather large issue. If you look at the design of the other remote mount turbos they are all in the very back of the car, so the heat exchange into the passenger cabin wouldn't have nearly the same affect. But this is all assuming the turbo/pipes would create enough heat to really get it warm, I don't see why it wouldn't though, especially considering rotary EGT's.

I don't think it would work for the same reasons as everyone else, lack of room under the car. After you went to the trouble to design a remote mount turbo kit for the FD you could have easily fixed all the underhood heat problems.

 

With a single turbo, there aren't any more underhood heat problems that don't exist with other cars making over 450 bhp. I see no point in this application for the FD. Of course, I consider the idea mildly retarded for a street driven vehicle of any type, but that's another issue altogether.

 

if someone made id buy it, there are some local comaros w/ the rear turbo setup and they were fast!, my old boosted dc2 that spanked a viper, twin tubo 350z,corvettes,comaros ect. so when i say fast i am not just saying fast cause the only refence point i have is a stock car

 

My understand is this was created to keep exhaust emissions down more than packaging. V8's have been suffing turbos in corwded engine compartments for quite some time now.

It is not that it would not work a rotary but it is not the optimum place to put a turbo. The main reason turbos work so well on a rotary is the huge amount of exhaust energy (heat) available at the exhaust port. I'd expect significant lag waiting for the exhaust to start spinning the turbine and air to fill those long intake pipes.

Not saying it can't be fast. In the last Motor Trend standing mile shoot out, a Pontiac GTO with rear turbo was the cheapest to mod and still did around 190mph+/- in the standing mile.

Jack

 

Stuffing is the key word. That's one of the reasons for the turbo is the ease of installation over "stuffing in those crowded NA engine bays".

 

1.3 litres is not enough to spin 2 turbos, pressurize 10 feet of piping, and over come the extreme lag of having the turbos so far away. Now with these V8's and there 4.6,5.0,6.0, and 7+ litres then its not as big of a deal.( The previous statement is just a guestimate.)

 

im pretty sure that the reason most people go with a remote turbo setup is because of the lack of room in their engine bay. i dont see how it would benefit an RX-7 though.

 

i dont understand how the turbo uses the heat energy from the exhaust port as people keep mentioning. Heat energy is generally the waste energy, unless you hook it up to some water and a turbine and make some electricity. I thought the reason turbos work so well in rotary engines is because the exhaust pulses are strong and fast? Im not saying anyone is wrong, but an explination would be nice.

 

Ever hold a kiddie windmill in the sun on a calm day? It is the same effect. Hot exhaust gases propel the turbine beyond just the exhaust "thrust".