Single Straight or Y Pipes

[savahn]

I never got a straight answer regarding this issue.

Straight pipe:
Lighter (less piping)

Y-pipe:
"prettier"

Is there any difference between a 2.5 inch single pipe and a 2.5 inch Y-pipe in terms of exhaust flow?

Because the Y-pipe is two pipes at 2.5 inch each after the cat, does that mean that effective diameter is 5 inch?

Some answers I've gotten:
No:
- Y-pipes are only as good as the diameter from the downpipe.
- Y-pipes are constrictive at the Y split which can add backpressure.
Yes:
- Y-pipes effectively function at double its diameter.
- Y-pipes can create positive pressure waves outwards of the system.

I havent met a single exhaust systems "specialist" who actually agree on either. And I've never seen dyno charts of any Y-pipes either - single pipes are cheaper and easier to build after all.

 

[effie]

Virtually all RX8 after market systems feature Y pipe configuration...... Here a few pics of my Fujita Engineering (FEED) system.........

 

[Alchemis]

effie.... your FEED is SWEEEEEEETTTT.... where you from ?


savahn,

theorotically... Y pipes doesn't cause back pressure at the split.
but the flow design is really a crucial point.
some Y pipes looks like T :)
then that's causing turbulance at the joint...

another thing to look at is your downpipe to midpipe to cat back... is it all 2.5 inch ? anything smaller.... it doesn't make sense...

the question goes back to yourself....do you want twin exhaust or single exhaust which is LOUD... Twins sounds softer than the single straight pipes...

 

[savahn]

Effie,

your FEED pipe is sweet. You will never find such fine construction here in Malaysia. Which is rather sad.

 

[effie]

effie.... your FEED is SWEEEEEEETTTT.... where you from ?

Bukit Jelutong, Shah Alam.....:regular_smile: :regular_smile:

 

[Alchemis]

haven't seen u around... join us when we have TT Session then :)

 

[effie]

Will join ur TT session......... Previous to this ive alwayz been with my other club..... TeamES.org which is the 7th Gen Civic Club. Im 1 of the Administrator/ Moderator on that forum. My previous Civic was 1 of the feature cars in TRAFFIC & HYPERTUNE Mag a couple of months back....... Now i will add RE Club Mal to the list of TT sessions to remember to go to...... Oh yeah, met up with Lennon a couple of times edi..... I service my 8 at Wangan and sometimes LINKS @ Sunway............

Here's a few pics of my Civic..... (off subject.....hahaha.....not an RE.....:_: )

 

[Lennon]

Effie, we meet at Dataran Prima every friday....... Even Alchemis now become regular.....:regular_smile:

 

[effie]

Effie, we meet at Dataran Prima every friday....... Even Alchemis now become regular.....:regular_smile:

Lennon....bro, next time ure @ Aman Suria gimme a call or Sms me larrrr....... I also go there for TeamES tt session (but not held sooo often anymore:confused_smile: )...... Was there last Thursday though and saw 4-5 FD's parked across from my 8....... Was really tempted to talk to them but had my other friends to entertain 1st larrr........ :X-: :regular_smile: .......... I'd be happy to join ya'll:shades_smile: :shades_smile: :shades_smile:



Effie:shades_smile: (pronounced F.E.)
016-7670202

 

[Lennon]

Lennon....bro, next time ure @ Aman Suria gimme a call or Sms me larrrr....... I also go there for TeamES tt session (but not held sooo often anymore:confused_smile: )...... Was there last Thursday though and saw 4-5 FD's parked across from my 8....... Was really tempted to talk to them but had my other friends to entertain 1st larrr........ :X-: :regular_smile: .......... I'd be happy to join ya'll:shades_smile: :shades_smile: :shades_smile:



Effie:shades_smile: (pronounced F.E.)
016-7670202

Thats what problems we found on 'one-make car club'...... So diversified car clubs would be fun, you learn about other cars, sometimes if keep on talking about rotary would turn you off too..... Even when Vincent's wife is pregnant, we still come for meeting without sms......

 

[Alchemis]

that night was really coincident that 4 to 5 FD parked side by side :)
one of them is MINE :) most stock look one :)

 

[effie]

Lennon.......I know....... actually im more interested in a diversified car club ........ See ya'll next Friday then......

Back when i had the FD, i had all my friends gather at my house.... Imagine 5-6 FD all parked side-by-side.... Even had a couple of FC........ Not to mention RE 13B Capella Bridge Ported........ That car was finally sold to RMD Workshop JB (Taib & Rafi)...............

 

[effie]

that night was really coincident that 4 to 5 FD parked side by side :)
one of them is MINE :) most stock look one :)

Then u may have noticed my 8 parked nearby:_: W**5005

 

[BLaCkHoWLiNG]

i thot taib and rafi has had that car like since 99??

 

[effie]

i thot taib and rafi has had that car like since 99??

Yesss....... i was talking pre 99 coz i had the FD from 96-00.......... They bought over the Capella from "Latif" in the late 90's.......

 

[effie]

Now, come 2006 last year i bought myself my second RE car....... Rx8....

 

[effie]

Anywayz, some of the FD's here in KL i remember from back when i owned 1..... Even the Silver FD "J*M771" that i saw @ Aman Suria last week (and also a couple of times at Sunway)....... Can't seem to remember the first owners name though.....But..... that car was a regular fixture in JB...... If memory serves me right, it was mostly driven by a Female driver back then.....