Exhaust thoughts
what would be better this exhuast system on a 5.7 gen3
TWIN 2.5" EXHAUST 5.7L COMMODORE SEDAN VT VY VX VZ SS (eBay item 120640512400 end time 29-Nov-10 09:24:38 AEDST) : Cars, Bikes, Boats $300
or a twin 2 1/2 inch (Custom) from my local muffler centre for $600
Real cars don't power the front wheels, they lift them
$299 is mega cheap
most on youtube are sixes which is useless
YouTube - VX SS exhaust note (on limiter)
Banned
I wouldn't recommend them...
Not a major fan of redback mufflers.
Not a fan of Xpipes. Personally I think they sound like utter shit.
lol, well the choice is down to a 2 1/2 twin system, from super shit auto for $800or $600 for a custom built 1 from my local muffler centre.
unless i can pick up a 2nd hand 1
Real cars don't power the front wheels, they lift them
Banned
Go the custom deal then. Make sure they don't use an Xpipe!!!
What mufflers are they going to use?
dont X pipes distribute air more evenly?
Anything has to sound better than the standard system.
if i was on a budget i'd go that $299
it's an LS1... it's always gonna sound shit
straight pipe... cheapest all and all LOL :P
Banned
Not really no.Originally Posted by NightRIDA
It totally depends on where they are in the exhaust and how they're designed.
Xforce Xpipes aren't designed, they're just two bends cut and welded together.
All it does is even out the exhaust pulse, which in theory is probably better for performance. But in the real world makes no difference, other then that the exhaust note sound like an L67.
what are you talking about?
L67s sound awesome
no really...
lol
Thanks mate!Not really no.
It totally depends on where they are in the exhaust and how they're designed.
Xforce Xpipes aren't designed, they're just two bends cut and welded together.
All it does is even out the exhaust pulse, which in theory is probably better for performance. But in the real world makes no difference, other then that the exhaust note sound like an L67.
Exhaust Guru
The 'X' pipe of an X force or that one in the picture isn't really an X pipe. It is exactly as soop said, just two bends cut and welded.
A true X pipe is actually pressed so that the pipework forms an X the same diameter right through the bends, like this
A true X pipe will scavenge better and improve acceleration if fitted in the correct position for the engine. How it does this is cross the exhaust pulse over to the other bank and pull the next pulse along behind it, increasing exhaust velocity.
Wiggle Wiggle Wiggle
Bullshit lol
This is with a crossover to..... Just on a side note
iv got a 2.5 mild steel xforce system put on the other day on my ls1. Sounds awesome, not excessive and on throttle enough to let the lollipop lady ur around! Great system and good gains. Pick the system up for 450-500.
CHIRP THIRD CAUSE U CAN
Banned
And I'll bet that X pipe costs as much as a whole Xforce exhaust system!!The 'X' pipe of an X force or that one in the picture isn't really an X pipe. It is exactly as soop said, just two bends cut and welded.
A true X pipe is actually pressed so that the pipework forms an X the same diameter right through the bends, like this
A true X pipe will scavenge better and improve acceleration if fitted in the correct position for the engine. How it does this is cross the exhaust pulse over to the other bank and pull the next pulse along behind it, increasing exhaust velocity.
It's also very relative to where the Xpipe is positioned in relation to the manifolds and the design of the manifolds. Very precision piece if you ask me. Worth it for a race car, almost impossible to get a really decent difference on a streeter.
My opinion, not certified fact.
Don't get me wrong either, I'm not trying to be an elitist twit pushing the more expensive product. But with these things you really really do get what you pay for.
Exhaust Guru
That particular X pipe is $250.
I experimented with the position on our Senator, going by the best dyno IE: seat of the pants.
First, when we got the car it had the X force style system on it, the first thing I did was piss the rear reso off, made it louder of course. The car felt like it had less accelration up top than it should have had, so I put a true twin on with a H pipe. Lost a lot of bottom end, but the top end got a lot better.
Step two, I then fitted the X pipe just behind the cats, picked up a heap of bottom end but lost a bit of top. Just didn't pull as hard past 4500rpm.
Step 3, got rid of the mufflers and moved the X pipe back there, and ran the pipes out behind each wheel with a hotdog on each side. Smoothed out the acceleration and gained a bit more top end, but it still felt like it was held up. Removed the hot dogs as they were off a VE SSV and the internals looked a bit smaller than 2 1/2".
So in the end the exhaust system is now Pacemaker tri Y's and stock HSV cats (on the car when we bought it) twin 2 1/2" into a X pipe just in front of the diff, then a 2 1/2" pipe out behind each back wheel. The difference was noticeable straight away, good hard acceleration right to redline, and it get's there quickly too. All this on the stock Senator 250kW tune.
On a side note, fuel consumption went from 12-13L per 100 when we first got it down to now getting 8.5-9L per 100 (highway).
Banned
Have you played with the pacemaker H-pipe at all?
I've no idea how they compare with just straight pipes but my car seems to go alright, top end isn't top end bad either.
Got any sound files of it?
Aint no family cruiser!!!
twin 3in with hotdogs = win, twin 2.5in always sounds shit IMO, not enough of a deep note
YouTube - WAL3SY goin nuts
Going where no late model stato/caprice has gone before.... GAME ON!!
Banned
Yeah that goes pretty well for a statesman ahah!
Frankly I think its more to do with the mufflers the the pipe diameter with regards to sound quality.
Exhaust Guru
No I haven't, but it works not only because of the spirals in them, but because they are "pinched" sort of. It works like a venturi, as the exhaust flows through it, it speeds up coming out the back of it.
No sound file yet, but I will put one up one day, I seem to get that request a lot lately.
Banned
Haha, Yeah that's How I understand it. They reduce a half inch or maybe 1/4 inch and works like a venturi.
What's your opinion regarding the Pacemaker H pipe and the true X pipes?
That's the pacemaker product for those that have NFI what I'm talking about. It's called a "V-tex"
Exhaust Guru
Each has it merits in different applications. Where more torqure is required in the mid range (street car) I would go for the X pipe, but that's just me. The Pacemaker H pipe works well too, but on a dyno it may have a lower torque curve at lower rpm. Wouldn't be much in it though.
Something to note though, any exhaust system is a restriction, the concept behind X pipes and those Pacey H pipes is to keep exhaust velocity at a maximum to reduce back pressure. Engines that run at maximum rpm like drag cars don't need an exhaust system, the pipes are tuned as an extension of the exhaust port and works in harmony with pulse reflection back through the intake, this is what achieves the result they want. An engine that is used for acceleration eg track cars, need some form of exhaust to achieve higher torque. Also, forced induction and NA require different setups as well.
Banned
Yeah, you're opening a huge can of worms there mate!
You said earlier that you have the Xpipe near the diff, how would it go with the V-tex after the cats as well?
Ya gotta love a V8 mate
Why don't you just run a split twin system and forget the X/H pipe ??
What differance would that make as I've been away from doing performance mods for a while ??
I do what I do, Not because I have to, Not because I want to, But because I can
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