Idea for duals on a SOHC without losing backpressure... | Ford Explorer Forums - Serious Explorations

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Idea for duals on a SOHC without losing backpressure...

Afboy143

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Joined
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Tampa,FL
Year, Model & Trim Level
1999 Ford Explorer Sport
I have been thinking about this idea for a while now and I now want to pass it by you guys to see what you think. Basically I went to keep the backpressure of a single 2.5" exhaust would have but get the sound of a true dual system. The mufflers would be Force mufflers (similar to the orignal 40 flowmasters, gets rave reviews on mustang forums. Seeing if I can get something a little deeper than the IMCO) Piping would be 2.25" Basically it would be one Y pipe from the heads, single 2.5" pipe, then another Y pipe splitting the 2.5" into 2.25". What do you think ? Would I keep the back pressure but gain sound?

exhaustpicture.jpg
 



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i dont know much about exhaust and back pressure but it sounds good to me... ? Im in the process putting an exhaust on mine too. Noone wants to touch it so I have to do everything.
 






I have found that some shops will use one muffler thats dual in\dual out. Its mainly for trucks and large SUVs but i will be getting that fitted to mine. Was told that should not effect backpressure and have excellent sound.
 






I have been thinking about this idea for a while now and I now want to pass it by you guys to see what you think. Basically I went to keep the backpressure of a single 2.5" exhaust would have but get the sound of a true dual system. The mufflers would be Force mufflers (similar to the orignal 40 flowmasters, gets rave reviews on mustang forums. Seeing if I can get something a little deeper than the IMCO) Piping would be 2.25" Basically it would be one Y pipe from the heads, single 2.5" pipe, then another Y pipe splitting the 2.5" into 2.25". What do you think ? Would I keep the back pressure but gain sound?

exhaustpicture.jpg


I don't know of anyone trying this so I couldn't say for sure what this would do for the exhaust (Performance or sound).

You've had duels before right? How much power did you loose? I'm not sure about this backpressure thing. I'm thinking it's more of the "exhaust" wave affect that's actually making you loose power. In theory, you should loose low end power and gain HP with a very open exhaust. That could make you feel like you've lost a lot cuss most of the power is now at a range that's not usable on street cars. Basically the bigger the pipe, the slower the 'wave' travels, the smaller the pipe the faster the wave travels. (Waves and gases flowing are different) You can't go to small cuss you won't have the area needed for the gases, go to big and now you have all the area you need plus but the waves slow down. Honesly, you really don't know unless you try it.

All the research I've done has pointed me to a 2.5 single exhaust for N/A. Also, for what it's worth, Tom @ supersixmotorsports gave me a great plan for an exhaust for my ride. He told me to stay single OR it won't sound very good. I'm pretty sure I have that plan posted on the build up thread.

kabukie - You could go the same route but can get away with 3" pipe cuss you're force fead. You'd gain more.
 






kabukie - You could go the same route but can get away with 3" pipe cuss you're force fead. You'd gain more.

I was thinking single in dual out. Ive been told with force fed backpressure isnt an issue. Heck Ive even thought of just running dumps from the muffler. Who knows what the future hold for my X
 






I don't know of anyone trying this so I couldn't say for sure what this would do for the exhaust (Performance or sound).

You've had duels before right? How much power did you loose? I'm not sure about this backpressure thing. I'm thinking it's more of the "exhaust" wave affect that's actually making you loose power. In theory, you should loose low end power and gain HP with a very open exhaust. That could make you feel like you've lost a lot cuss most of the power is now at a range that's not usable on street cars. Basically the bigger the pipe, the slower the 'wave' travels, the smaller the pipe the faster the wave travels. (Waves and gases flowing are different) You can't go to small cuss you won't have the area needed for the gases, go to big and now you have all the area you need plus but the waves slow down. Honesly, you really don't know unless you try it.

All the research I've done has pointed me to a 2.5 single exhaust for N/A. Also, for what it's worth, Tom @ supersixmotorsports gave me a great plan for an exhaust for my ride. He told me to stay single OR it won't sound very good. I'm pretty sure I have that plan posted on the build up thread.

kabukie - You could go the same route but can get away with 3" pipe cuss you're force fead. You'd gain more.


I have run duals in the past (dual in/dual out 2.25") and I lost a lot of low end power. When I went from duals to a single Y pipe with single 2.5" exhaust I gained a lot of low end power back. I guess I will just keep my single
 






I have run duals in the past (dual in/dual out 2.25") and I lost a lot of low end power. When I went from duals to a single Y pipe with single 2.5" exhaust I gained a lot of low end power back. I guess I will just keep my single

Well, you really won't know until you try it. The only problem is if you do loose all the low end torque.. ;(
 






I was thinking single in dual out. Ive been told with force fed backpressure isnt an issue. Heck Ive even thought of just running dumps from the muffler. Who knows what the future hold for my X

I've heard the same.
 






WHY????

I dont understand the logic, sacrifice power and torque for sound?

You want sound run the factory cats with no muffler
or a muffler that doesnt do much.
the size of the pipe will effect the backpressure.
If you want dual tips run a single in dual out muffler.

trying to gain sound is not a good approach to doing exhaust, sound is a result of a well planned system
2.5" single is enough for a naturally aspirated SOHC with bolt ons, heck its probably enough for a boosted SOHC

you want to keep your torque keep your single exhaust, just my opinion.
 






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