Mee87Rx7

87 n/a
just wondering which is better, going single or dual aftermarket exhaust? which will make it faster?

rycerock3t

single exhaust is lighter - but it all depends on you dude... im not sure if it will make it any faster... it would make it faster, but not by much

slpin

iTrader: (9)

the difference between 146 hp and 147hp is minimual

metal

Yeah, the weight difference isn't going to make much of a difference. Generally a dual exhaust setup will be quieter in most cases due to having two mufflers...My Corksport catback sounds great for the price though!

NZConvertible

Weight is a non-issue and power depends on other far more important variables. It all comes down to cost and noise. Single is cheaper and louder; dual is more expensive and quieter. Simple as that.

Black Knight RX7 FC3S

iTrader: (7)

Now how about going true dual........

ExSr20kidF2

true duals on an FC?...

my dual apexi's def. arent quiet i set off alarms under 2k...

Aaron

deagle50ae

How is weight a non-issue?
less weight = more speed and better handling
more power = more speed

the power gain from going dual is heavily negated by the mass added.

I'd much rather drop 40lbs than gain 2hp

FCKing1995

iTrader: (3)

Diff in aftermarket duel vs aftermarket single isnt 40 pounds. maybe 15. even if it was 40, thats like carrying a bag of dog food in your car, or a small child. not going to matter much. so its not a non issue, just not a big issue

deagle50ae

it can't be that low..
you've got 8' of pipe and a resonator/muffler. it adds up if you have both.

besides, he asked about performance.

but i dunno. maybe i'm crazy.... actually, I probably am.

classicauto

iTrader: (3)

A little bit

You don't lose 8' of pipe when you go single. You lose 1 muffler and half of the "Y" section, maybe 3.5' of pipe in total. I would be surprised if it added up to more than 15lbs alltogether (as mentioned)

Im guessing you're the type who never fills his tank past 1/2 because that other 25lbs of gasoline would be detrimental to the handling and performance of your FC

cost vs. noise that you can get away with - thats the decsions he needs to make.

An FYI - J-Rat runs an RB dual system, 2.5", and his engine still produces nearly 500hp.......just an FYI.

deagle50ae

oooo. right right.
sorry I was thinking true duals.

I need to get pistons out of my head

if you're just doing a y in the pipe at the back of the car, then yes, the power difference is not nearly as severe as previously stated.

my-sons rx7

Just like NZConvertible said. Plus the dual looks so much better then the single. IMO.

Sharado

Weight makes a huge difference
be it just 10 lbs or even 5 lbs
so I would definitely go for single, which I have on my car

PS: if you think 5 extra pound is a non-issue, you are no racer.

rotarygod

iTrader: (1)

I guarantee that 2 identical cars with only 5 lbs of difference between them would be identical in terms of performance and speed on the street. In fact, 10 lbs won't even change things.

Nice disclaimer. Too bad it doesn't apply to street cars. This is reality. Not the track.

classicauto

iTrader: (3)

Weight does make a difference, you don't need to be a rocket scientist to figure that one out. But seriously, we're talking a 5 to 10lbs.

If you're that much of a racer, can you tell the difference between when you drive on a full stomach, or when you are hungary?

How about a full tank of gas to 3/4 of a tank? (which, BTW is more than 5lbs difference, so Im giving you any easy one there)

Weight does matter, and every bit can count.........when you're striving for that extra tenth for your drag car.

FCKing1995

iTrader: (3)

Did your floor pan fall out while you were hitting the nos mang? Seriously... 20 pounds is like carrying a bag of groceries... on the track in extreme situations where your car is gutted and tuned to perfection... yes, 20 pounds will throw things out of check just a little. on the streets even 50 pounds isnt noticable, especially when its distributed on both sides of the car. But its not 50 pounds, its maybe 20 pounds at most.

I better remember to empty my pockets and take out my registration next time I race...

EJayCe996

Correction, faster acceleration, less inertia.

magus2222

iTrader: (22)

"Weight makes a huge difference
be it just 10 lbs or even 5 lbs
so I would definitely go for single, which I have on my car

PS: if you think 5 extra pound is a non-issue, you are no racer."

actually dude, no offense, but 5 lbs is a non-isseu, you are obviously a ricer. having an extra 5 lbs UNDER the center of gravity will only cause more pull to the underbelly, unless you are like me, and have fab'd an ENTIRE bellypan, CB i might add (goddamn, if anyone knows fiberglass or CB, then you know how hard this was!)

PEACE

deagle50ae

Fiberglassing is my friend! i love working with it.

anyways... yes, CJay, you're correct. lol I'm typing fast an at work trying not to be caught.

gootar23

(off topic)

wow you fabbed an entire belly pan. Any pics?

MazterDizazter

iTrader: (5)

Any weight you can remove from behind the rear axles or in front of the front axles reduces polar moment of inertia. The lower polar moment of inertia, the better. Now I'm sure it saves more than 5lbs. The heat shield for the extra muffler weighs at least 2lbs. Even if it only is 5lbs, every ounce counts. If you remove 5lbs here, 2lbs there, 10lbs someplace else it all adds up. I hope all you guys who think weight doesn't matter get smoked by some flyweight car with half the horsepower. Then maybe you'll think twice about weight reduction. As for horsepower difference, I have no idea. The less restrictive the better, is about all I can offer in that respect. Keep in mind though that it will get very loud if you have a straight single exhaust, even with a good muffler and catalytic converter. My S5 TII with a 3" turboback, cat, and muffler is deafening, and because of that I really don't drive it on the street much. So it's certainly something to think about.

ramz28

i think its 1/100 off your 1/4 mile time for evey 100lbs of weight lost, but even up 2 50lbs on street car makes nuthing change. this car drives so nice you dont evne know its there, theis cars gonna get a dual exhaust and hopesfully true dual, looking at racing beat road race system will check out corkport 2

FCKing1995

iTrader: (3)

We arent on the same page I guess. Yes a little here and a little there adds up. But we arent talking about a little here and there. We are talking maybe at the most 15-20 pounds in the rear from an exhaust. You cant honestly be saying I will feel the difference between 1 and 2 mufflers... If you do think that Im sorry...

Good lord, thinking about it, I better go empty my windsheild washer fluid res. and all of that dirty brake fluid! Its weighing down the front end a little too much for my liking. Maybe Ill do away with the oil too. It all adds up!

bacek

this is funny, this guy obviously isnt going to track the car seriously otherwise hed already know all this stuff.....

the OP is, for my guess, going to use this car 95-99.5% of the time on the street.

now all you internet racers with your "5lbs make the biggest difference" crap get off this board because you sound like tools.