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RE: Cutting the y-pipe for H-pipe duals. Affected Backpressure?
Quote:
ORIGINAL: olvanish
If you do that your gas mileage will be about 3-5 percent lower plus you'd lose some low end torque just like people who put 3 inch piping on 4 bangers do. backpressure is the cause
id like to see where you got that information from. these cars dont have loads of backpressure waiting to be opened up, but they do have enough that dual exhaust will be beneficial to the performance of the car.
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RE: Cutting the y-pipe for H-pipe duals. Affected Backpressure?
backpreasure is the force that is created by the motor trying to push the gasses out, that is bad, however, you want the exhaust gasses to get "sucked" out of the motor with as much velocity as possible going to a 2.25" cat back with an H/X pipe will decrease backpreasure and help a little bit with velocity to help give you a little more power
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RE: Cutting the y-pipe for H-pipe duals. Affected Backpressure?
Quote:
ORIGINAL: ARdoller
well most race engines are carburated, but thats besides the point[8D]
the 4cyl mustang after 1985 was efi, and that car needed all the backpressure it could get
What the hell does that have to do with back pressure? It's not the induction system that's affected it's the cylinders and they need a certain amount of scavenging to make power and if you have too much free flow you lose low end power.
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RE: Cutting the y-pipe for H-pipe duals. Affected Backpressure?
Quote:
ORIGINAL: raz54
Quote:
ORIGINAL: ARdoller
well most race engines are carburated, but thats besides the point[8D]
the 4cyl mustang after 1985 was efi, and that car needed all the backpressure it could get
What the hell does that have to do with back pressure? It's not the induction system that's affected it's the cylinders and they need a certain amount of scavenging to make power and if you have too much free flow you lose low end power.
it was proving the fact that his statement was absolutely irrelevant to the topic
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RE: Cutting the y-pipe for H-pipe duals. Affected Backpressure?
hey, i have an 02 sixer and live near the steeda manufacturer shop. i bought their h pipe adapter for the six cylinder, and their gt true dual cat back set. it was pricey, around 700 for everything. i installed it all myself with wrenches and a saws all. it was not to bad. you just cut they y pipe a few inches back after the cats and then bolt the h pipe on. this h pipe system runs about a hundred bucks, and will allow you to use any dual exhaust system. you could buy this h pipe and use any exhaust system, but it is a great pipe and will not affect your cats. this adds a very deep good sound. www.steeda.com i can answer many questions about this that i have not covered yet. feel free to contact me
RE: Cutting the y-pipe for H-pipe duals. Affected Backpressure?
Quote:
ORIGINAL: raz54
I'm not sure on your MPG but if you lower your back pressure too much you will sure lose low end tq. If you stay with 2.25" pipe and keep all the cats you should be OK with true duals.
i have to disagree. first off nowhere in fluid dynamics is the term backpressure exist. it is restriction. secondly of all the cars i have seen dyno'd none have been more that 3-5ftlbs down on torque down low.
you gain more up high which flattens or lengthens the torque curve which can feel like you lost low end but in reality low end stayed about the same while the mid and high gained. it will fool the butt dynoi every time. i know for myself it feels more sluggisg low but it really isn't. the dyno and 60' times can prove it every time.
2.25" is sufficient for the V6. you can gain alittle more with 2.5 and 3" duals but they are not really needed for most. if you have Nitrous or a Blower then 2.5 is fine. a guy over at V6power gained 12-15rwhp/twqe with dual 3" and dual Random technology superhigh flow cats but his car is cammed and ported and polished too and i think he puts down 240ishrwhp NA
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RE: Cutting the y-pipe for H-pipe duals. Affected Backpressure?
ok check it....i got a 94 v6 mustang i just had dual flow master install on my car. the shop went ahead and cut off 2 cats. now ever since then when i take off the car seems to put a bit....like its gasping for air, fuel, or something! (dont do it all the time) so i went back to the shop, they tol dme i need to adjust my fuel system to match up with the new back preassure. so i took my tang to another shop and had them install a adjustable fuel regulator an da high performance chip. well, they check engine light stop coming on, and everything seem fine for a bit, until a day or so, the same crap happen again. my tang would putt for a bit on take off speed. so then i went back to the exhaust shop and they pointed out that i needed to buy a mil O2 eliminator. i did jus that and had them install it yesterday. today it still did the same putting crap when you take off. so, do i need to keep all four cats on with the dual flow masters, or what? i dont have h pipes or x pipes, i'm running stright dual exhaust pipes from front to back. please help anyone!
RE: Cutting the y-pipe for H-pipe duals. Affected Backpressure?
When I was running around with just my BBK O/R X-pipe and no mufflers I have NO backpressure and unless you dumped it from 3,000 RPM's and hookedracing was not possible. The total lack of backpressure made the car unlikable to drive. The sound was baddass but fuel economy went way WAY WAYYYYYY down.
When I got my Borla's on it upped my backpressure to acceptable levels giving me pleanty of torque and power up top.
I should also mention that it is illegal to run without cats in California. I have been checked in the past for cats, CHP doesnt f*ck around if they suspect anything.
RE: Cutting the y-pipe for H-pipe duals. Affected Backpressure?
BTW guys, it only cost me $70 dollars to have a shop fit that nice 2.5" BBK X-pipe to my V6.... You guys should do the same and not waste so much cash.
Also that engine is from a 2000 that I put a lot of work into.
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RE: Cutting the y-pipe for H-pipe duals. Affected Backpressure?
