thorne Posted July 11, 2007 Author Report Share Posted July 11, 2007 Well if you don't know much about turbo setups I could see someone saying that. actually you are supposed to have backpressure on NA cars. Quote Link to comment Share on other sites More sharing options...
SpaceGhost Posted July 11, 2007 Report Share Posted July 11, 2007 Thorne, I think you should go with 4" piping and since you have no cats you will need the 4" piping. I mean 2.5" exhaust is clearly not a big enough diameter to allow a massive 2.o Liter Flat four to breathe. Yeah a straight pipe that is loud as shit will never be annoying, for you or anyone around you. Nevermind that on NASIOC that dyno time has proven that a cat back nets you a whopping 10 HP and guess what with no cats you do lose back pressure, because of that you lose about 10-20 lb-ft of torque down low. Congrats on wanting to make your car just like a Honda. What is your screen name on NASIOC? Quote Link to comment Share on other sites More sharing options...
Bam Posted July 11, 2007 Report Share Posted July 11, 2007 :lurk: Quote Link to comment Share on other sites More sharing options...
Maro Posted July 11, 2007 Report Share Posted July 11, 2007 Nevermind that on NASIOC that dyno time has proven that a cat back nets you a whopping 10 HP and guess what with no cats you do lose back pressure, because of that you lose about 10-20 lb-ft of torque down low. Yeah... the whole catback craze cracks me up. I've got $75 into my delete pipes.... and there 316L stainless. Quote Link to comment Share on other sites More sharing options...
Maro Posted July 11, 2007 Report Share Posted July 11, 2007 sweet. will do, let me know when your going to be out. For now I just wanna get the pipe to not be pointing at the top of my car. Look like this Friday.... see the COS board. Quote Link to comment Share on other sites More sharing options...
Miller Posted July 11, 2007 Report Share Posted July 11, 2007 sweet. will do, let me know when your going to be out. For now I just wanna get the pipe to not be pointing at the top of my car. Thorne I'm using flowmaster 40 series mufflers, you can check them out when we race. osickburn Quote Link to comment Share on other sites More sharing options...
Bam Posted July 11, 2007 Report Share Posted July 11, 2007 Thorne I'm using flowmaster 40 series mufflers, you can check them out when we race. that's 2 for the 40 series, see my post on the 1st page... Quote Link to comment Share on other sites More sharing options...
surefooted Posted July 11, 2007 Report Share Posted July 11, 2007 go read about turbo setups .... I want the most free flowing exhaust system I can possibly have. no back pressure = easier boost. You will lose massive amounts of torque. Quote Link to comment Share on other sites More sharing options...
thorne Posted July 12, 2007 Author Report Share Posted July 12, 2007 Thorne, I think you should go with 4" piping and since you have no cats you will need the 4" piping. I mean 2.5" exhaust is clearly not a big enough diameter to allow a massive 2.o Liter Flat four to breathe. Yeah a straight pipe that is loud as shit will never be annoying, for you or anyone around you. Nevermind that on NASIOC that dyno time has proven that a cat back nets you a whopping 10 HP and guess what with no cats you do lose back pressure, because of that you lose about 10-20 lb-ft of torque down low. Congrats on wanting to make your car just like a Honda. What is your screen name on NASIOC? Explain to me how I'm losing back pressure when there is a turbo sitting directly off of the exhaust manifold. My straight pipe setup is temp I've never been one to stick to a single exhaust setup. Also when I'm trying to prepare the car for the larger turbo I already have at IPS why would you not pickup every pony you can. Cat back 10hp ok thats 10hp@the wheel according to the dynos. Thats close to 15-20 at the crank. Also please explain to me why I picked up almost a full pound of boost by taking off just my muffler. Quote Link to comment Share on other sites More sharing options...
thorne Posted July 12, 2007 Author Report Share Posted July 12, 2007 Basically, the mid pipe can also be considered a straight pipe. Straight pipes and turbochargers go hand in hand when making power. Since the mid pipe removes the third cat, we knew midrange power was going to make the difference. Just like the front pipe, the mid pipe was able to pick up plenty of power, ranging from 5 to 13 hp, while still able to produce an additional 2 hp at the peak. Torque levels were extremely high landing an additional 20 lb-ft of torque in comparison to our previous run. That is from importtuner mag. Ya know what I got 20$ that says I put down within 3ft lbs of tq of the 218 I orginaly put down. Quote Link to comment Share on other sites More sharing options...
AJ Posted July 12, 2007 Report Share Posted July 12, 2007 go to jeg's and get a dynatech muffler sound very bad ass, i think there like $75 quites the sound quite a bit and there is no back pressure, think mild steel Borla. Quote Link to comment Share on other sites More sharing options...
thorne Posted July 12, 2007 Author Report Share Posted July 12, 2007 I'm going to have to try it out AJ. Notice guys he said NO BACK PRESSURE. I don't see anything uber insane about my setup. Quote Link to comment Share on other sites More sharing options...
heelside1647545510 Posted July 12, 2007 Report Share Posted July 12, 2007 you could always do an electric cut out, thats what i am goign to do here shortly Quote Link to comment Share on other sites More sharing options...
thorne Posted July 12, 2007 Author Report Share Posted July 12, 2007 Heelside I've thought about that too. I am going to dyno it how it sits. I've got 3 tunes I'm working on. Fuel Eco Daily Lani. Quote Link to comment Share on other sites More sharing options...
heelside1647545510 Posted July 12, 2007 Report Share Posted July 12, 2007 nice, i am running 20 psi on the 14b with fuel upgrades,would i have a chance against the wrx? Quote Link to comment Share on other sites More sharing options...
AJ Posted July 12, 2007 Report Share Posted July 12, 2007 you can also look at Hooker Super Comp mufflers, they may look like a regular muffler but i can see threw them and i have a off set inlet and a center out. the center in/out you can see stright threw them too and only dropped a 406ci small block 1 horse on the dyno vs. open headers, thats impressive in my book so i put them on my camaro. Quote Link to comment Share on other sites More sharing options...
thorne Posted July 12, 2007 Author Report Share Posted July 12, 2007 I'm going to get the muffler from martin dyno with it off and dyno with it on and post the graphs. Next weekend is dyno day for me. Quote Link to comment Share on other sites More sharing options...
ImUrOBGYN Posted July 12, 2007 Report Share Posted July 12, 2007 turbo + no back pressure = :burn: turbo + back pressure = :marc2: Quote Link to comment Share on other sites More sharing options...
2pointslow Posted July 12, 2007 Report Share Posted July 12, 2007 3 in turbo back to this would be a good set up. http://www.focusfanatics.com/forum/showthread.php?t=116278 flo-pro twister... what turbo are you going to be using? Quote Link to comment Share on other sites More sharing options...
Scotty2Hotty Posted July 12, 2007 Report Share Posted July 12, 2007 Spiral flows or Race bullets are a GREAT resonator, I'd deffinately reccomend for the muffler you run. Glasspacks will burn out in no time, not to mention the poping sound you'll be getting. Bullets have far less packing in em, and sound great while doing a little to quiet things. Quote Link to comment Share on other sites More sharing options...
Martin Posted July 12, 2007 Report Share Posted July 12, 2007 i was simply stating sounds not performence. thorne wanted to know about getting rid of that annoying ping Quote Link to comment Share on other sites More sharing options...
surefooted Posted July 12, 2007 Report Share Posted July 12, 2007 Thorne, I would bet you $20 bucks that you would make less torque with you rsetup than with a properly R&D'd exhaust. As Space Ghost mentioned, it had even been proven on Nabisco. Multiple times actually. Oh Yea, FYI, boost != power. Quote Link to comment Share on other sites More sharing options...
thorne Posted July 12, 2007 Author Report Share Posted July 12, 2007 Ok read the other thread here. It says opposite. What would make you think that a boosted car need any back pressure? The turbo is the back pressure period. My statement is a Straight pipe with madrel bends will do better then any exhaust on the same car. Since dont have a clean baseline dyno on the same tune i have the other dyno on its going to be hard. But I will post my dyno. Best I;'ve seen before is 228. Thats 8 more HP then Cobb claims on there stage2 setup. Quote Link to comment Share on other sites More sharing options...
thorne Posted July 12, 2007 Author Report Share Posted July 12, 2007 it is true that the best exhaust for a turbo car is no exhaust. The turbo will provide plenty of backpressure until it's in boost and by that time it doesn't matter either way. However with a stock turbo car such as yours (which i'm assuming you still have the stock up pipe as well) the exhaust size won't matter much beyond 2.5 inches unless you're going to be upgrading your turbo and significantly increasing your airflow. Why is it so hard for anyone to understand this? Quote Link to comment Share on other sites More sharing options...
surefooted Posted July 12, 2007 Report Share Posted July 12, 2007 Peak torque vs. area under the curve. Which is more important to you? But like I said in PM, its your car, do what you will. Quote Link to comment Share on other sites More sharing options...
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