im no expert either,i was educated buy the guy who did my exhaust,so im biased towards my style of x pipe.
its good to hear your x pipe worked out well for u myss427.that must sound sweet with a 3.5 inch system
ls2lxhatch system looks really good too.same principle.i dont know if i could get cats in my system the way it is
i dont like the magna flow one,it looks to bendy.
doctor gas looks good.
just dont get an xpipe with a hole drilled in it to make the x,if u are going to get an x pipe
X-Pipes tech talk
Started by
LXCHEV
, Sep 28 2009 01:49 PM
43 replies to this topic
#27
myss427
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Posted 29 September 2009 - 02:59 PM
Warren was running twin 4 inch on his 9 second streeter 454 UC hatch (very loud) I think road ways at Belconnen, Canberra made the mufflers and exhaust
#28
_oldjohnno_
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Posted 29 September 2009 - 04:34 PM
I'd love to see back-to-back testing of an X crossover system versus a 2>1 merge collector feeding a single pipe of the appropriate diameter.
#29
Posted 29 September 2009 - 07:01 PM
^^ You'd have to test half a dozen different designs of X pipes
#30
_Bomber Watson_
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Posted 29 September 2009 - 07:14 PM
And same amount different designs of merge collector, how far along mostly.
Cheers.
Cheers.
#31
Struggler
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Posted 29 September 2009 - 08:04 PM
I tried to copy the Dr Gas with my effort. Also the Burns unit was popular a few years ago in NASCAR though they have now moved away from the X.
burns-x.jpg 21.01K
24 downloads
This is the Burns Stainless X pipe, see what I mean about the gases crossing from one side to the other rather than just being exposed to the other side. I would imagine this has a better scavenging effect.
Also that DiFillipo pic is a perfect example of poor flow. It might look the part but the overheating at that point is a sure sign of a restriction.
MYSS427, yes Warren did have a twin 4" toward the end there, it ran better with a 4" single than the twin 3" and then better again with the twin 4" but bear in mind it did have more than 500 CID and got turned pretty hard, it was no street car. Also the pipes were totally seperate, no H or X.
My SBC Tonner was using a seperate twin 3 1/2" system. When I moved it all into the HQ Prem it showed more HP and torque with a twin 3" with the home made X.
burns-x.jpg 21.01K
24 downloadsThis is the Burns Stainless X pipe, see what I mean about the gases crossing from one side to the other rather than just being exposed to the other side. I would imagine this has a better scavenging effect.
Also that DiFillipo pic is a perfect example of poor flow. It might look the part but the overheating at that point is a sure sign of a restriction.
MYSS427, yes Warren did have a twin 4" toward the end there, it ran better with a 4" single than the twin 3" and then better again with the twin 4" but bear in mind it did have more than 500 CID and got turned pretty hard, it was no street car. Also the pipes were totally seperate, no H or X.
My SBC Tonner was using a seperate twin 3 1/2" system. When I moved it all into the HQ Prem it showed more HP and torque with a twin 3" with the home made X.
#33
_LHoon_
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Posted 29 September 2009 - 10:45 PM
Hey guys, good thread. I thought I'd also share a few pictures of my homemade x-pipe. Its twin 3 inch with quality stainless mandrel bends.
IMG_3090.JPG 587.29K
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IMG_3091.JPG 566.18K
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IMG_3094.JPG 392.15K
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IMG_3692 - Copy.JPG 1.16MB
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IMG_3303.JPG 956.65K
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IMG_3090.JPG 587.29K
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IMG_3091.JPG 566.18K
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IMG_3094.JPG 392.15K
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IMG_3692 - Copy.JPG 1.16MB
45 downloads
IMG_3303.JPG 956.65K
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#34
_NURVUS_
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Posted 30 September 2009 - 12:44 PM
In the process of doing mine aswell.
The cut on this design needs to be decent so the merge
becomes slightly smaller to create the scavenging effect.
3" pipe, the cut is 200ml long.
The cut on this design needs to be decent so the merge
becomes slightly smaller to create the scavenging effect.
3" pipe, the cut is 200ml long.
#35
_ass308_
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Posted 30 September 2009 - 07:55 PM
^there top jobs 
theres some darn good home made exhaust systems on this forum.
theres some darn good home made exhaust systems on this forum.
#36
_HRV74_
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Posted 07 October 2009 - 10:13 PM
Hi guys
Interesting stuff.
ass308, your new set-up looks tops!
Here's a pic underneath mine. Twin 3's. This made an extra 60rwhp over the previous twin 2.5" system that used a H pipe! However these changes were all done before I owned her, so I can't quote all the variables, such as muffler spec, etc.
Cheers, H
Interesting stuff.
ass308, your new set-up looks tops!
Here's a pic underneath mine. Twin 3's. This made an extra 60rwhp over the previous twin 2.5" system that used a H pipe! However these changes were all done before I owned her, so I can't quote all the variables, such as muffler spec, etc.
Cheers, H
Edited by HRV74, 07 October 2009 - 10:14 PM.
#37
_NURVUS_
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Posted 17 October 2009 - 03:50 AM
Looks good HRV and i believe the gain you got because we finished and test drove mine tonight.
The old exhaust was 2.5 inch with no crossover pipe at all, 2 unknown brand mufflers and it had some dodgy pressed bends in places. It used to just barely turn the tyres punching second gear with the TH350 on a good day.
It's now 3 inch, mandrel bends and 2 hooker mufflers. After a quick test drive tonight, punching second gear is just plain scarey, and it now turns the tyres in top gear from about 60 or 80km. We expected a difference but not this much and figure a gain of between 60 and 100hp keeping in mind the old exhaust was crap. There is a louder drone inside the car at idle and low revs.. but who cares.... it does top gear skids
The old exhaust was 2.5 inch with no crossover pipe at all, 2 unknown brand mufflers and it had some dodgy pressed bends in places. It used to just barely turn the tyres punching second gear with the TH350 on a good day.
It's now 3 inch, mandrel bends and 2 hooker mufflers. After a quick test drive tonight, punching second gear is just plain scarey, and it now turns the tyres in top gear from about 60 or 80km. We expected a difference but not this much and figure a gain of between 60 and 100hp keeping in mind the old exhaust was crap. There is a louder drone inside the car at idle and low revs.. but who cares.... it does top gear skids
#38
_cruiza_
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Posted 17 October 2009 - 07:11 AM
Just a left field suggestion, but what about a single system, I had a 3" pipe which worked a treat and sounded like a V8 supercar from the early 90s
#39
Struggler
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Posted 17 October 2009 - 07:19 AM
Just a left field suggestion, but what about a single system, I had a 3" pipe which worked a treat and sounded like a V8 supercar from the early 90s
That is what I'm running now, dual 2 1/2" into single 3 1/2" but I'm not sure if it has helped or hindered.
I do feel the single sounds better though !!!
#40
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Posted 17 October 2009 - 10:33 AM
Bloody hell some of you blokes are crafty. Top jobs on the fabrication!
#41
_beergut_
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Posted 17 October 2009 - 08:16 PM
isn't single for power and twin for sound?
that's what an exhaust shop told me once
that's what an exhaust shop told me once
#42
_NURVUS_
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Posted 17 October 2009 - 08:33 PM
Yeah on a 6 cylinderisn't single for power and twin for sound?
that's what an exhaust shop told me once
#43
_cruiza_
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Posted 17 October 2009 - 09:12 PM
isn't single for power and twin for sound?
that's what an exhaust shop told me once
I make no claims to being any sort of expert. All I can do is relate what I had told and why. A chap by the name of Graham Valintine did my exhast setup, Graham was at one point in his career the exhast guy for a formula one race team, so I should say he knows his stuff. He took two days to build a single three inch system for me starting out with twin 4" but flattened to give clearance and while maintening volume under the gearbox crossmember this went down to twin 3" and then to a single 3" with a small custom made box racing muffler and then back up and over a 9" diff all mandel bent curves in stainless.
Ok here are some comments and reasoning on why this was a good design for MY CAR I had 380 - 400 real HP from a 308 V8
There is such a thing as too big, you want a certin amount of gas flow speed to enable siphon effect, also to avoid back eddies in gas flow thru muffler and bends
As the gas flow away from engine they cool maintaning gas pressure flow rates mean that pipe diameter getting smaller can can be a good thing
Gas flow rate, volume of gas and tempture all interrelate so it is about designing system so that as tempture cools pipe size adjusts and muffler is not a sudden change in back presure
A large single pipe has better gas flow then two slightly smaller pipes as there is less surface area of pipe in contact with gas ie 3" single better then twin 2.5"
Oh and smaller pipe after muffler can cause major problems with back pressure in the muffler and have dramic negative effects so if you cann't fit 3" over the diff then do whole system in smaller size
Thats about all I can remmber from what he told me.
#44
LXCHEV
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Posted 17 October 2009 - 09:27 PM
Great stuff guys, loving all the pics and info.
Just thought I'd add these photos that I finally uploaded. This was the last twin 3" system I had behind my old 4-into-1's. The pics shows the large rectangular balance pipe/tube that I described in my earlier posts.... it seemed to work really well.
Just thought I'd add these photos that I finally uploaded. This was the last twin 3" system I had behind my old 4-into-1's. The pics shows the large rectangular balance pipe/tube that I described in my earlier posts.... it seemed to work really well.
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