TII exhaust questions, which one????
06-11-02, 05:18 AM
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TII exhaust questions, which one????
ok so theres a shop in town that has one of those million dollar mandrel bending machine so the place could easily fabricate me an exhaust and i'm hoping the place stays in business so i'd like to throw them a little of my business. the question is what size exhaust do i go with? i was thinking either 2 1/2 or a 3" turbo back single exit instead of dual. i've heard different things about different sizes. not sure where i remember hearing about loosing to much backpreasure and a little torque if i were to go with a 3" but i always figured the bigger the piping the better/cooler the car is going to run and due to the nature of the Rotary cooler is better. so me being a bit of a novice still when it comes to these cars i just wanted to get the opinions of some of the people in here. also i figured by going with a single it would save me some money and a wee bit of weight. any info or opinions are appriciated. thanks.
06-11-02, 08:44 AM
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Fixed the wheelhop
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For the most power, Id go with a 3" turbo back. As long as your wastegate is ported, you shouldnt have much problems with boost creep. And mandrel bent would be the best. This is my plan for my exhaust, except Im buying sections of straight pipe and U-bends and welding it up myself. Wont be pretty, but it will be cheap. Basically it wont leak 
And yes! Single is lighter, lighter is better!!
And yes! Single is lighter, lighter is better!!
06-11-02, 09:12 AM
#3
Contact this man.
Since you are in the area, I would contact this man. He's the local Rotary Expert and RX-7 specialists.
As far as the OD of the exhaust, it depends on what mods you have now, what you plan on going with in the future, and other variables. You won't see the full benefit or difference between the two until you get the engine ported and upgrade the turbo.
Either setup will be a lot better then the stock $hit. If you go with the 3" you may gain more up top with a sacrifice in low end and torque.
Rotaries love open exhaust, but also like a lil back pressure.
The only way to go is single exit exhaust on turbo rotaries. You will save weight, gain power, save money, etc...
The true dual's only work good on the NA's and are more for look.
Just make sure you have a FCD, and that the boost stays down (no creep) and that you get the engine enough fuel.
Let us know how it turns out.
As far as the OD of the exhaust, it depends on what mods you have now, what you plan on going with in the future, and other variables. You won't see the full benefit or difference between the two until you get the engine ported and upgrade the turbo.
Either setup will be a lot better then the stock $hit. If you go with the 3" you may gain more up top with a sacrifice in low end and torque.
Rotaries love open exhaust, but also like a lil back pressure.
The only way to go is single exit exhaust on turbo rotaries. You will save weight, gain power, save money, etc...
The true dual's only work good on the NA's and are more for look.
Just make sure you have a FCD, and that the boost stays down (no creep) and that you get the engine enough fuel.
Let us know how it turns out.
06-11-02, 10:34 AM
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Just Call Me Terminator!
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i'm running rb 3" dp, custom 3" mp and apexi n1 catback. if you can run full 3" turbo back custom. its a night and day difference. might want to upgrade to a S5 turbo and manifold to prevent creep
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06-11-02, 07:59 PM
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Re: Contact this man.
Originally posted by the_glass_man
Since you are in the area, I would contact this man. He's the local Rotary Expert and RX-7 specialists.
As far as the OD of the exhaust, it depends on what mods you have now, what you plan on going with in the future, and other variables. You won't see the full benefit or difference between the two until you get the engine ported and upgrade the turbo.
Either setup will be a lot better then the stock $hit. If you go with the 3" you may gain more up top with a sacrifice in low end and torque.
Rotaries love open exhaust, but also like a lil back pressure.
The only way to go is single exit exhaust on turbo rotaries. You will save weight, gain power, save money, etc...
The true dual's only work good on the NA's and are more for look.
Just make sure you have a FCD, and that the boost stays down (no creep) and that you get the engine enough fuel.
Let us know how it turns out.
Since you are in the area, I would contact this man. He's the local Rotary Expert and RX-7 specialists.
As far as the OD of the exhaust, it depends on what mods you have now, what you plan on going with in the future, and other variables. You won't see the full benefit or difference between the two until you get the engine ported and upgrade the turbo.
Either setup will be a lot better then the stock $hit. If you go with the 3" you may gain more up top with a sacrifice in low end and torque.
Rotaries love open exhaust, but also like a lil back pressure.
The only way to go is single exit exhaust on turbo rotaries. You will save weight, gain power, save money, etc...
The true dual's only work good on the NA's and are more for look.
Just make sure you have a FCD, and that the boost stays down (no creep) and that you get the engine enough fuel.
Let us know how it turns out.
Hey its "old *****"(inside joke) lol... you should get like a 10" pipe like those cool ricers with the green civic ex's.
-Ryan
06-11-02, 08:37 PM
#11
I'm a boost creep...
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Re: Contact this man.
Originally posted by the_glass_man
You won't see the full benefit or difference between the two until you get the engine ported and upgrade the turbo.
You won't see the full benefit or difference between the two until you get the engine ported and upgrade the turbo.
If you go with the 3" you may gain more up top with a sacrifice in low end and torque.
Rotaries love open exhaust, but also like a lil back pressure.
The only way to go is single exit exhaust on turbo rotaries. You will save weight, gain power, save money, etc...
The true dual's only work good on the NA's and are more for look.
Last edited by NZConvertible; 06-11-02 at 08:41 PM.
06-11-02, 08:53 PM
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Anyone have any hard evidence that a single exhaust is better than a dual besides wieght? Im thinking 3rd gens had single(correct me if im wrong), im sure mazda engineers had a reason, maybe just space, maybe weight, who knows...
06-12-02, 09:37 AM
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Originally posted by NZConvertible
Yep, mainly space, but weight too. Note they've returned to dual parallel mufflers for the RX-8.
Yep, mainly space, but weight too. Note they've returned to dual parallel mufflers for the RX-8.
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