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Old January 28th, 2005, 04:37 PM   #1
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Custom Downpipe installed yesterday

Hey I got a custom downpipe and a test pipe made and installed yesterday. I took these pixtures when my friend andI were putting some exhaust wrapping on it today. The sound is really nice. Louder and deeper. Low end may have lost a little bit but the gain on high end is well worth it. The pull from 3000 to redline is like instantaneous. I decided to not bend the second pipe like a j. is equal pipe lenth that important? It is made out of aluminized steel. The guy did it for 200$ .







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Old January 29th, 2005, 07:54 AM   #2
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Have you had your car dyno'd before the install? Definitly get it dyno'd now.
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Old January 29th, 2005, 08:05 AM   #3
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Is that the HFP kit? I don't think the lowering job came out too even, looks like the back is ok, but the front has a few fingers worth of a gap.

It kind of looks like my civic, but reversed, when I put the front springs on the rear, and the rear on the front... LOL



That looks pretty good. I hope you have a before dyno for comparison!!!

SWEET
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Old January 29th, 2005, 09:02 AM   #4
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Old January 29th, 2005, 10:18 AM   #5
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i'm pretty sure he was being sarcastic, scubaman
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Old January 29th, 2005, 11:38 AM   #6
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yes sarcasam..... trying to lighten the board up a little....
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Old January 29th, 2005, 12:11 PM   #7
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Looks good, but I think there may be a problem. The reason the stock pipes twist and turn all around is so they have equal lengths from each side of the engine bank to the mufflers...now they are unequal which could cause issues. It could allow one side of the engine to run "quicker" since it can expell gases faster, or it could allow one side of the engine to run hotter or cooler than the other. Any one else think this may be an issue?
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Old January 29th, 2005, 02:02 PM   #8
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yes sarcasam..... trying to lighten the board up a little....
just some suggestion.. put j/k, smilie, or something at the end so people know you're joking..
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Old January 29th, 2005, 06:21 PM   #9
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Originally Posted by blu6speed
Looks good, but I think there may be a problem. The reason the stock pipes twist and turn all around is so they have equal lengths from each side of the engine bank to the mufflers...now they are unequal which could cause issues. It could allow one side of the engine to run "quicker" since it can expell gases faster, or it could allow one side of the engine to run hotter or cooler than the other. Any one else think this may be an issue?

I think it might be an issue, but he might be able to get away with it. I showed my performance shop pictures of T-mans j-pipe and asked if it was really necessary to have that huge bend. They told me it was because if one pipe happened to be a shorter length than the other, just like you said, one set of pistons that have the shorter route to the exhaust may work more efficiently causing some sort of backpressure which can in turn be the cause of losing too much low end torque. I'm not an expert on this so I could be wrong.
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Old January 29th, 2005, 09:55 PM   #10
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yeah brex you are right... new to all of this board stuff.....

but I know how to search...
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Old January 29th, 2005, 10:36 PM   #11
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Originally Posted by Shadytype
yeah brex you are right... new to all of this board stuff.....

but I know how to search...
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Old January 30th, 2005, 01:58 AM   #12
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good sh*t man....mine is still instorage damit!

gotta get all that stuff installed soon....hmmm did u end up removing all 3 cats then?

congrats btw! woooooooooooooooooot!!! lol
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Old January 30th, 2005, 03:44 AM   #13
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i dont think it would necessarily matter if they are "uneven" now... not all cars run equal length headers or manifolds. when a non equal length switches to an equal length it IS better. but vice versa i dont think it would be particularly bad for the car, but just not the best performance choice, dig?
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Old January 30th, 2005, 02:43 PM   #14
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Quote:
Originally Posted by Shadytype
Is that the HFP kit? I don't think the lowering job came out too even, looks like the back is ok, but the front has a few fingers worth of a gap.

It kind of looks like my civic, but reversed, when I put the front springs on the rear, and the rear on the front... LOL



That looks pretty good. I hope you have a before dyno for comparison!!!

SWEET

nahhhh its gottt to be the prokit of course duhh
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Old January 30th, 2005, 03:04 PM   #15
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yeah the maximas don't have a jpipe, and they're fwd as well. not to metion 3kgt's as well. i think the jpipe is an oddity rather than the norm.
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Old January 31st, 2005, 12:05 AM   #16
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I don't know, is it really better to have equal length piping. Cause wouldn't it go out faster if it has less twists and turns? And even if one side is runing more efficiently than the other does that necessarily mean that the efficiency of the other one goes down. I woudl think that they work independantly of one another
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Old January 31st, 2005, 12:15 AM   #17
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yea less twists and turns would mean the fumes go out faster...which is a good thing...the faster they expell, the quiker your car can combust.
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Old January 31st, 2005, 01:26 AM   #18
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no I only removed the one that is visible when you look under the car. The 3rd cat which is the one without the o2 sensor. The piping on the borla catbck looks a little small do you guys think that it is worth getting larger piping or should I just leave it as is. I would replace the pipe that goes to each of the 2 mufflers. Those pipes seem kinda small buit maybe thats because teh exhaust is being split inhalf because of the dual mufflers. what do you guys think?
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Old January 31st, 2005, 01:33 AM   #19
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don't waste the money man....imo
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Old January 31st, 2005, 01:36 AM   #20
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hey i just noticed this, but it looks like the j pipe is on stock manifolds???

you should have put some headers on with the j pipe...just IMO
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Old January 31st, 2005, 10:33 AM   #21
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can't put headers on a 7th gen v6, as they're cast into the block courtesy of honda.
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Old January 31st, 2005, 10:38 AM   #22
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^^ 7gen can't replace header..

edit: damn.. u beat me to it, tx03coupe
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Old January 31st, 2005, 10:46 PM   #23
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When I: drive around 2500 RPM there is a vibrating sound from under teh car. I think since i used 2.5 inch piping it is vibrating against teh frame of the car. My friend and I used a little header wrap to try to stop it but i dont' think it was enough . Are there any stores that I can get header wrap from or only online?
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Old January 31st, 2005, 11:16 PM   #24
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haha man, i am new and i have already seen so many people posting about getting custom headers for our car, and all of them have the same responce....it can't be done....that is why everyone is focusing on the j-pipe mod....lol
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Old February 1st, 2005, 12:03 PM   #25
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Quote:
Originally Posted by Jliu2k2
When I: drive around 2500 RPM there is a vibrating sound from under teh car. I think since i used 2.5 inch piping it is vibrating against teh frame of the car. My friend and I used a little header wrap to try to stop it but i dont' think it was enough . Are there any stores that I can get header wrap from or only online?
hm.. i would think u need to take it back to them and have it re-adjusted for more room so it doesn't vibrate against the frame.. or.. make it so it doesn't vibrate at all..
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Old February 1st, 2005, 07:33 PM   #26
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what is the difference in a downpipe and a J-pipe is it the same thing?
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Old February 1st, 2005, 07:53 PM   #27
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its the same thing..
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Old February 1st, 2005, 09:25 PM   #28
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You want equal length to take advantage of the so called "scavenging" effect, typically at low revs.

Exhaust gas comes out of our engine as pulses, with high pressure (leading) and low pressure (trailing) regions moving like a train out our exhaust. This is seen mostly at low rpm.

Having equal length piping before a merge ensures the exhaust pulses merge easier and even "pull" the other pulse merging behind from the other pipe branch. The higher the velocity of these "pulses", the stronger the scavenging effect. That's why you don't want a 3" header .. but neither do you want a 1" pipe cause the back pressure will be more significant than any scavenging benefit.


Just like intake manifolds .. that's why there are variable length/geometry intake runners. All we need now is actually variable geometry headers/exhaust!
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Old February 1st, 2005, 09:57 PM   #29
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The guy can switch it to equal length for me for about 50$. I think i'll do that this weekend and hopefully get teh vibrating fixed too. I jsut don't want to spend more money and lose power so u guys think tat making it equal length iwll definitely help, at least on teh low end?
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