Single Pipe to Twin - Pro's & Con's?

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11-08-10, 14:22
Chuck_g

Single Pipe to Twin - Pro's & Con's?

Hey All

Just wondering is there any disadvantages to changing a single massive exhaust pipe to a twin set up?? If ya had a 4 inch pipe, what would be equal?? 2 2inch??

Cheers
11-08-10, 14:47
Robbie Daly Ps13

Well half of 4 is 2 chuck so im sure 2 and 2 would be equal.....:p I also would like to know bout this....! Dan moorehead had a straight pipe back into twins and it sounded awsome.....!
11-08-10, 15:02
Baz_180

Well you would have more volume in the 4inch pipe
A 24inch long 4inch pipe has twice the volume as 2 x 24inch 2inch pipes.
11-08-10, 15:40
DaveM-sport

Cross sectional area is all that matters :)

pi r squared for the 4" gives you 12.56 square inches.

So half that and it's 6.26" of area you need for each of the twin pipes.

6.26/3.14 and square root of that and you get 1.41 for a radius which will mean you need two 2.8" dia pipes. So you'll either need 2" 1/2, 2" 3/4 or 3" pipe.
11-08-10, 15:45
Aidan Hogan

Yowdy has twin pipes on his so try asking him ??
11-08-10, 15:46
Aidan Hogan

Quote:

Originally Posted by DaveM-sport

Cross sectional area is all that matters :)

pi r squared for the 4" gives you 12.56 square inches.

So half that and it's 6.26" of area you need for each of the twin pipes.

6.26/3.14 and square root of that and you get 1.41 for a radius which will mean you need two 2.8" dia pipes. So you'll either need 2" 1/2, 2" 3/4 or 3" pipe.

Too many numbers there for me but does that answer the question :confused:
11-08-10, 15:47
PeterT

Twin pipes are pimp! Mine sounds awesometastic. Theres all the answers you need
11-08-10, 15:49
Baz_180

Oh right my bad! learn something new everyday
11-08-10, 16:11
Chuck_g

Quote:

Originally Posted by DaveM-sport

Cross sectional area is all that matters :)

pi r squared for the 4" gives you 12.56 square inches.

So half that and it's 6.26" of area you need for each of the twin pipes.

6.26/3.14 and square root of that and you get 1.41 for a radius which will mean you need two 2.8" dia pipes. So you'll either need 2" 1/2, 2" 3/4 or 3" pipe.

Holy shit Dave...................:p

Quote:

Originally Posted by PeterT

Twin pipes are pimp! Mine sounds awesometastic. Theres all the answers you need

What i thought yes, will go nicely with next years look :)
11-08-10, 16:12
DaveM-sport

Quote:

Originally Posted by Baz_180

Oh right my bad! learn something new everyday

No, you were right. Two 2" pipes have alot less volume than one 4" pipe. I just used alittle bit of old basic maths to find out he needs two 2.8" pipes to have the same as what he has now.

It's just that maths is pretty had to write and explain on a forum :o

Therea more too it than just volume like friction losses, turbulence and all that shit in the different sizes of pipe but fook going that far:rolleyes: :p

Pros would be, the twin pipes sound better.
Cons would be the system would be heavier than a single pipe and it's twice the piping you need to make again if you break it or it falls off :D
11-08-10, 16:17
stevek

so where do the twin pipes start from?? just after the turbo?:confused:
11-08-10, 17:29
HADE MOTORSPORT

Any of the twin pipes i have done were only about 18"to24" long where the back box used to be they sound the job. i have even done some side exit exhaust but these would be purely competition only
11-08-10, 18:15
ste

Quote:

Originally Posted by HADE MOTORSPORT

Any of the twin pipes i have done were only about 18"to24" long where the back box used to be they sound the job. i have even done some side exit exhaust but these would be purely competition only

hoe much would a twin pipe set up cost on lets say my r34...
11-08-10, 18:27
Alan B.

relocate you back box to work as a mid box, and run twin pipes from there all the way back :D
11-08-10, 20:51
grimix180

i have a 3 inch pipe which goes to 2 3 inch pipes at the back sounds the nuts
11-08-10, 21:30
HADE MOTORSPORT

Quote:

Originally Posted by ste

hoe much would a twin pipe set up cost on lets say my r34...

pm sent lad
11-08-10, 21:33
Mick K

Out of interest,Whats the new look for the car Chuck?

Paint?
11-08-10, 21:41
Chuck_g

Quote:

Originally Posted by Mick K

Out of interest,Whats the new look for the car Chuck?

Paint?

What a silly question................ul see when its done!
12-08-10, 08:50
PeterT

Quote:

Originally Posted by Alan B.

relocate you back box to work as a mid box, and run twin pipes from there all the way back :D

back box? mid box? naaaaaah, 3 inch from turbo into two 3 inches from the diff back:D
12-08-10, 09:01
Newsome

Quote:

Originally Posted by HADE MOTORSPORT

pm sent lad

Pm me cost aswel.:D For an s14 drift car so doesnt need to be pretty.
12-08-10, 10:17
PeterT

Quote:

http://i169.photobucket.com/albums/u...o/DSC00930.jpg

cut my old system in half, and tabbed on roughly where wed like this one

http://i169.photobucket.com/albums/u...o/DSC00932.jpg

http://i169.photobucket.com/albums/u...o/DSC00933.jpg

http://i169.photobucket.com/albums/u...o/DSC00934.jpg

http://i169.photobucket.com/albums/u...o/DSC00931.jpg

http://i169.photobucket.com/albums/u...o/DSC00935.jpg

however the apexi exhaust control valve wasnt happy with its ground clearance so i had to take it out

http://i169.photobucket.com/albums/u...o/DSC00937.jpg

but fuck it, looks bad ass. Thanks mick and jay!

http://i169.photobucket.com/albums/u...o/DSC00938.jpg

http://i169.photobucket.com/albums/u...o/DSC00941.jpg

Yes, everyone should have twins!
12-08-10, 17:18
tweek

Anyone actually use a 3inch without a backbox and then change to twin 3inch???? Much of a difference in sound??
12-08-10, 17:25
Chuck_g

Now thats exactly wat i want Pete, lovely dude!
13-08-10, 07:10
PeterT

Quote:

Originally Posted by tweek

Anyone actually use a 3inch without a backbox and then change to twin 3inch???? Much of a difference in sound??

My original exhaust was 4 inch actualy I do beleive, with a backbox that did fuck all to quiten it, its got way louder since puttin the twins onto it!

Chuck, I thought you hated twin pipes!?