NA Exhaust
#1
Adolf Hitler Verfechter
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NA Exhaust
Hi everyone!
12A BP FB
Does anyone have any suggestions on exhaust pipe size and lenght ?
I think my exhaust is restricting me at the moment.
Will ne used occasionally on the road,but noise isn`t really a issue
Thanks!
Karis
(More detailed specs in ym sig)
12A BP FB
Does anyone have any suggestions on exhaust pipe size and lenght ?
I think my exhaust is restricting me at the moment.
Will ne used occasionally on the road,but noise isn`t really a issue
Thanks!
Karis
(More detailed specs in ym sig)
#2
I'm a CF and poop smith
id use a combo of stock exhuast+cut out
I was driving around my FC the other day with just a downpipe on and its really not as loud as people say. yes it is louder them most exhuast but not that much louder then a FD with a 3inch dp+4inch MP+4inch catback
I was driving around my FC the other day with just a downpipe on and its really not as loud as people say. yes it is louder them most exhuast but not that much louder then a FD with a 3inch dp+4inch MP+4inch catback
#4
Eats, Sleeps, Dreams Rotary
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For n/a engines, anything over 2 1/2 inch really doesn't gain you much in the upper RPM's and will hurt you in the lower rpm's. With a bridgeport i would get at least the 2 1/2 in exhaust. Racing Beat makes some really nice stuff. Mazdatrix also offers a race header and tubing to "build your own" system.
The way to get the most out of an n/a engine is to have a true dual system. ( dual pipes from the engine block all the way back to the outlets.) Kinda loud but the best gains by far.
http://www.mazdatrix.com/r-exh-85.htm Something like this for the First gen
Here is the true dual for the FC's.( just to get an idea.)
http://www.mazdatrix.com/r-ex86nt.htm
The way to get the most out of an n/a engine is to have a true dual system. ( dual pipes from the engine block all the way back to the outlets.) Kinda loud but the best gains by far.
http://www.mazdatrix.com/r-exh-85.htm Something like this for the First gen
Here is the true dual for the FC's.( just to get an idea.)
http://www.mazdatrix.com/r-ex86nt.htm
#5
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For a bridge ported engine you do not want true duals. A bridge ported engine needs the exhaust scavenging that can only be provided by a collected system.
- Cooper Lacy
- Cooper Lacy
#6
Adolf Hitler Verfechter
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From what i have learned...the pipes must be collected at the rear axle.I just wanted to make sure about this
So 2.25 inch should work fine ?
Thanks for the info provided.
Cheers
Karis
So 2.25 inch should work fine ?
Thanks for the info provided.
Cheers
Karis
#7
www.lms-efi.com
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Read through this thread. There is great info on collected v. uncollected systems and a brief discussiong of diameter and it's effects. You make the call.
https://www.rx7club.com/showthread.p...ning+resonance
https://www.rx7club.com/showthread.p...ning+resonance
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#8
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for the B.port buy the custom make it yourself header from RB and go dual till right before the rear axel ( same size pipes that come off header) and then 3" over the axel into a 3" straight though muffler
#9
www.lms-efi.com
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Again, read the link. The collector cannot be place at an arbitrary point somewhere near the rear axle. There is a specific point it is place to best effect the scavenging. You'll need to snake 6-8ft of pipe around underneath the car to get the collector where it needs to be.
#10
Adolf Hitler Verfechter
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Goodness me,what alott of math!The problem:I cant send it to the dyno,before my fueling,and exhaust is sorted,so its hard for me to say,at what rpm the hp will start climbing,and where it will peek.
If i`am using the same size header,as the rest of the exhaust....i`ll have to scratch my head alott to fit 2 x 2.25" pipes under the car ,and still have it high enough to drive it.
Thansk for the info..i`ll continue searching
If i`am using the same size header,as the rest of the exhaust....i`ll have to scratch my head alott to fit 2 x 2.25" pipes under the car ,and still have it high enough to drive it.
Thansk for the info..i`ll continue searching
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