MarkPerez

Has anybody done a duel exhuast setup on a 1st gen ?
If so,,how does it route under the car and around the gas tank. thanks

diabolical1

iTrader: (3)

Y??????

Winnipeg85GSL

I don't think its possible without a fuel cell. Smeagol has it but that car is propane powered.

Jerm982

What is a Fuel Cell?

diabolical1

iTrader: (3)

i don't know if this is "oversimplified", but it's basically a gas tank, but they're used on race cars or custom applications!

the differences are they are usually thicker, more impact resistant, more compact, and can be placed in a variety of locations, some may also have built in safety devices to decrease the chance of fire/explosion in heavy, direct impacts ...


guys, did i cover most of it?

Keaponlaffen

I was thinking of mounting a custom round fuel cell in the spare tire hold, and mount the spare tire under the car, then you could mount dual exhaust.... but then again, like Diabolical said: Y would you want it? Are you a ricer boy

alien_rx7

I've also seen them have internal bladders so that there is never any empty space for vapors to build in the fuel cell. Also they usually have some type of check valve so that if you somehow end up hanging from your harness your gas doesn't leak out. There are a couple of companies out there that make one that fits the spare tire area. I think it's only 5 gallons but hey if you're only racing 1/4's that's more than enough.

Manntis

you wouldn't want to mount the fuel cell anywhere inside the car - that could be potentially fatal. Nevermind the burning gas coating you in a collission (napalm, anyone?) the vapours could get you high/unconscious as you drive.

alien_rx7

Now I know I've seen at least a couple of ProRally cars with the fuel cells inside the car. When you've got all that built in safety such as double walled container, internal bladder, check valve, etc and the thing is bolted down correctly I'd say you're more at risk of getting hurt by having just a regular external gas tank. Plus most people that run the fuel cells also have a remote cutoff valve. I know my friend who raced a Plymouth FireArrow in a couple of the ProRally series races had his cutoff right by his seat and remember these cars also are required at least one (if not more) fire extinguishers. I felt safer in my friend's car than any other car I've been in.

PaulFitzwarryne

The question is what are you trying to achieve with a twin system?

Gen 2 had a Y form of twin tailpipes but it is a matter of dipute whether the weight increase was justified by any efficiency.

It would be possible to have two small pipes running in parallel with offset presilencers and mufflers, but it would be exoensive and heavy. I looked at the option but have so far not been convinced.

jeremy

iTrader: (1)

a twin system would be nice if you're just running headers and straight pipes (no presilencer). and yes, most all rtacing cells are mounted inside the car and are far, far safer then a gastank but hold less fuel and usually have the rollcage designed around them. the don't "spill" due to a specific foam they are filled with that eliminates major spillage in an instance they are ruptured and keeps fuel slosh to a very minimum.

WackyRotary

If I used a fuel cell I would cut out the area were the spare tire is and mount it as low as possible. Not lower then the gas tank ofcourse. But as for dual pipes running to the back on one side and the other is a waste of time. The only reason to do that is because you want it to look symetrical or something? Dual header pipes can run side by side and follow the stock location back.
Why would someone want dual tips except to look like 5.0 rustang or Z28. THose stupid honda and acura cars are coming out with pipes on both sides of the car for no reason except to mimic that "Look". If they come from one side of the car, leave the there.

I own a second gen car and think the reasoning behind this is pretty dumb to have. Its more heavy then a 1st gen piping really and flows the same, which is the main concern. 3rd gen cars went back to single side because they realized its just extra weight and it was made to be as light as possible.

Manntis

The reason why most race car fuel cells hold such little fuel isn't just weight; it's to prevent the fireball I just mentioned. The foam is good at preventing vapours inside the tank (fuel/air bomb) but doesn't always prevent burning fuel from escaping when the fuel cell is ruptured. There are enough burnt race cars to testify to the contrary.

That's why gas tanks on any streetable car are on the outside, with proper metal shielding around them. Incidentally Ford is now in **** for deleting the metal shielding on Crown Victoria models, causing at least one police officer to burn to death after his car was rear-ended (à la Pinto)

If you're willing to trailer your ReX to and from the track and use it for race only, but then you wouldn't want dual exhaust because of the added weight with zero performance gain, so you wouldn't need the fuel cell.

j9fd3s

iTrader: (3)

ive seen 2 turbo mufflers mouted vertically together where the stock muffler was.

mike

Rotary-MG

iTrader: (1)

Don't flame me if I'm going against the grain here, but wasn't the effect of having dual exhaust that doesn't connect is to increase torque, not HP? Since the pulses don't mix, connecting pipe, this system tends to be louder. But as in with the long primary system, you keep the pulses separated as long as possible, increase the scavenging...blah, blah, blah.

Why not run the two pipes to a single muffler that has two inlets? Routing should be the same as stock, so would the look.

If not mentioned previously, the foam in the fuel cell is also like a big sponge that will slow down a fuel spill in the case the tank is pierced. Around the foam is a bladder of tear resistant matterial that gives and hopefully keeps the fuel from spilling out if the outer case is opened up.

Depending on your race org. certain fuel cells are certified for certain classes of racing. They aren't all the same. Expensive!

gamble302

i have the raqcing beat street port exhaust and it runs dual all the way back until the muffler......

jeremy

iTrader: (1)

well you're just not cool enough.

Manntis

abeomid

It is a FUEL CELL. It's called a cell, b/c it is supposed to be mounted inside the car. They are designed to not malfunction or leak under extreme conditions. Trust me your roll cage will malfunction b4 the fuel cell.

RotorMotorDriver

iTrader: (1)

So...No to dual exhaust? I was looking into doing dual side pipes like a cobra or something...I planned on doing some major restrictive work though...Header to pre-silencer, then to two U-bend pipes to bring it back up towards the front, then two more to switch it back to going ouit the back and trying to get it out to the sides, then have it run through two cheery bomb type glasspacks and thats it...Talk about loop-the-loop .

The cherry bombs were only gonna be used so that it has the "flared" look like the mufflers on a Cobra or Corvette, not for function. Talk about loud...

~T.J.

PS - I suppose I could go street port headerand not collect then go out and would have to do the loop-the-loops cause it wouldnt end as far back...If that makes sense, but Ive sence changed my mind, Im not just going out to the RB muffler .

PPS - WooHoo!! 1000 posts

abeomid

I don't think you want that many U-bends in the exhaust. It won't flow that well.

jeremy

iTrader: (1)

i vote side exhaust. right in front of the rear wheels.

WackyRotary

What a waste of time. But thats just me, I think most will agree with me on this. Adding extra feet of pipe tends to not help in the weight department don't you think?

BadAssRX-7

side pipes on a rx7 = BAD... a friend had vette side pipes on his 85 and it was so phucking loud it hurt. he had a header cut and welded to go to each side of the car and to the sidepipes and it REALLY SUCKED *** it was so loud...plus it scraped all the time on speed bumps

Manntis

It's called a cell because it's a self contained unit, just like the proper name for a battery is an "energy cell". The name has nothing to do with whether it's inside or outside the passenger compartment of a car (and the inside of the hatch is in side said compartment, with the cargo area considered a "parcel shelf")

The DeLorean had a fuel cell instead of a conventional gas tank and it was OUTSIDE the passenger compartment, between the front Y forks of the frame (roughly where the transmission sits in a ReX)

For street applications anything inside with driver and passenger is not DOT legal. My point was if he puts a fuel cell in the spare tire area he can't drive the car to the track.