View Poll Results: "best" downpipe
HKS
30
24.59%
M2
36
29.51%
Pettit
20
16.39%
Mindtrain
2
1.64%
Other
25
20.49%
Rx7fashion
5
4.10%
N-tech
4
3.28%
Voters: 122. You may not vote on this poll
"best" downpipe
10-22-02, 09:38 AM
#28
Originally posted by Dont_Be_A_Rikki
I have PFS DP and it comes with new bolts and a special bolt for the "hard to get on/off" spot
. Very well made and does not rust. Made of t304.
-Rikki
I have PFS DP and it comes with new bolts and a special bolt for the "hard to get on/off" spot
. Very well made and does not rust. Made of t304.-Rikki
I used Allen Heads so its much easier to take on and off.
10-22-02, 10:48 AM
#31
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I installed my Pettit DP without removing ANY studs. I did not have to jack up the engine either. I just used one of the nuts that come with the pipe to put on the stud that almost hits the pipe. If you start to put that nut on BEFORE you get the pipe all the way over the studs it fits fine. Use PB Blaster on the studs the night before you start the DP install.
10-22-02, 12:07 PM
#32
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Originally posted by RotaryKnight
Remember any of the Japanese produced down pipes will not flow as well as most of the US ones. Not saying that they are bad or anything I had a Mindtrain, which was a copyof the, HKS one when I was twin.
BUT the Japanese downpipes are designed for RHD cars and that is why the collector is flat and crimped...so that it won't hit the steering colum.
Now on US cars you don't have to worry about it and so the US made down pipes can have a larger bend there.
Just my 2 cents.
Chris
Remember any of the Japanese produced down pipes will not flow as well as most of the US ones. Not saying that they are bad or anything I had a Mindtrain, which was a copyof the, HKS one when I was twin.
BUT the Japanese downpipes are designed for RHD cars and that is why the collector is flat and crimped...so that it won't hit the steering colum.
Now on US cars you don't have to worry about it and so the US made down pipes can have a larger bend there.
Just my 2 cents.
Chris
10-22-02, 02:13 PM
#33
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Originally posted by fdracer
no they don't. that cobra head peice is not their for space limitations it's there for more hp. it's designed to allow the turbulent flow coming fromt the turbine to smooth into laminar flow. they didn't just randomly put that crimp there, it's designed to be there. they will make more hp than american ones, though i admit not much. if anyone disagrees i'd like to make an even trade w/ my ss american dp (no crimp) w/ someone who has a ss japanese one(crimp).
no they don't. that cobra head peice is not their for space limitations it's there for more hp. it's designed to allow the turbulent flow coming fromt the turbine to smooth into laminar flow. they didn't just randomly put that crimp there, it's designed to be there. they will make more hp than american ones, though i admit not much. if anyone disagrees i'd like to make an even trade w/ my ss american dp (no crimp) w/ someone who has a ss japanese one(crimp).
10-22-02, 02:56 PM
#35
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So why do people bother with the Pettit instead of just getting the M2, which seems to be easier to install? Both are 3" polished 304, and they cost about the same.
10-23-02, 05:57 AM
#36
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www.jt-imports.com the TOPFUEL section has a SS downpipe for about $500 with shipping.
I dont know the quality, but im sure Jason at JT-imports does..
Matt
I dont know the quality, but im sure Jason at JT-imports does..
Matt
10-23-02, 11:54 AM
#38
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Originally posted by LAracer
So why do people bother with the Pettit instead of just getting the M2, which seems to be easier to install? Both are 3" polished 304, and they cost about the same.
So why do people bother with the Pettit instead of just getting the M2, which seems to be easier to install? Both are 3" polished 304, and they cost about the same.
10-23-02, 01:51 PM
#39
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Originally posted by fdracer
no they don't. that cobra head peice is not their for space limitations it's there for more hp. it's designed to allow the turbulent flow coming fromt the turbine to smooth into laminar flow. they didn't just randomly put that crimp there, it's designed to be there. they will make more hp than american ones, though i admit not much. if anyone disagrees i'd like to make an even trade w/ my ss american dp (no crimp) w/ someone who has a ss japanese one(crimp).
no they don't. that cobra head peice is not their for space limitations it's there for more hp. it's designed to allow the turbulent flow coming fromt the turbine to smooth into laminar flow. they didn't just randomly put that crimp there, it's designed to be there. they will make more hp than american ones, though i admit not much. if anyone disagrees i'd like to make an even trade w/ my ss american dp (no crimp) w/ someone who has a ss japanese one(crimp).
10-23-02, 04:50 PM
#41
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"Because it takes about 3 years to get any products from M2."
That's what I figured. I'm new to this game, and I'm learning that if you want something, you better order 6 months in advance.
That's what I figured. I'm new to this game, and I'm learning that if you want something, you better order 6 months in advance.
10-23-02, 07:12 PM
#42
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Knightsports (squished Cobra Head) JDM type in SS. This is very similar to Mazdaspeeds 2-into-1 header style version.
Last edited by GoRacer; 10-23-02 at 07:17 PM.
10-23-02, 11:28 PM
#44
Originally posted by dingleberry
www.jt-imports.com the TOPFUEL section has a SS downpipe for about $500 with shipping.
I dont know the quality, but im sure Jason at JT-imports does..
Matt
www.jt-imports.com the TOPFUEL section has a SS downpipe for about $500 with shipping.
I dont know the quality, but im sure Jason at JT-imports does..
Matt
Jason
10-23-02, 11:49 PM
#45
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Originally posted by Jason
Why would anyone want to spend $500 on a DP. Especially one that doesnt flow as well.
Jason
Why would anyone want to spend $500 on a DP. Especially one that doesnt flow as well.
Jason
10-24-02, 07:00 PM
#46
Originally posted by GoRacer
With two 2.5" pipes and a 2-into-1 design, i'd imagine they flow excellent but at a price that isn't worth the gain unless you race professionaly and need an edge at any cost. The Mazdaspeed version is $1,000.00
With two 2.5" pipes and a 2-into-1 design, i'd imagine they flow excellent but at a price that isn't worth the gain unless you race professionaly and need an edge at any cost. The Mazdaspeed version is $1,000.00
Jason
10-24-02, 07:35 PM
#47
Originally posted by GoRacer
Knightsports (squished Cobra Head) JDM type in SS. This is very similar to Mazdaspeeds 2-into-1 header style version.
Knightsports (squished Cobra Head) JDM type in SS. This is very similar to Mazdaspeeds 2-into-1 header style version.
Im a little confused. To me it is like having a little more restrictive "Y" split exhaust system like on the FC, then just one on the FD. Most peeps convert there FC to a single exhaust for better flow.....so why would you make the "DP" two into one?
10-25-02, 12:32 PM
#48
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Originally posted by Mazdabation
Could some one explain to me why this "knightsports" or "Mazdaspeed" two into one DP is better then one 3" tube???
Im a little confused. To me it is like having a little more restrictive "Y" split exhaust system like on the FC, then just one on the FD. Most peeps convert there FC to a single exhaust for better flow.....so why would you make the "DP" two into one?
Could some one explain to me why this "knightsports" or "Mazdaspeed" two into one DP is better then one 3" tube???
Im a little confused. To me it is like having a little more restrictive "Y" split exhaust system like on the FC, then just one on the FD. Most peeps convert there FC to a single exhaust for better flow.....so why would you make the "DP" two into one?
seriously, if anyone has a ss jdm dp w/ the cobra head and you don't like it, i'd like to trade my us style ss dp w/ you. i'm open to the hks dp as well w/ some cash for my dp, considering the hks is mild steel.
10-25-02, 01:56 PM
#49
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Originally posted by fdracer
the 2 pipes should in theory increase low end torque. they serve to increase exhaust velocity while maintaining the same cross sectional area that a single 3" dp would, by dividing the exhaust amongst two smaller tubes. at that price it's definitely not worth it though for the small amount of extra torque.
seriously, if anyone has a ss jdm dp w/ the cobra head and you don't like it, i'd like to trade my us style ss dp w/ you. i'm open to the hks dp as well w/ some cash for my dp, considering the hks is mild steel.
the 2 pipes should in theory increase low end torque. they serve to increase exhaust velocity while maintaining the same cross sectional area that a single 3" dp would, by dividing the exhaust amongst two smaller tubes. at that price it's definitely not worth it though for the small amount of extra torque.
seriously, if anyone has a ss jdm dp w/ the cobra head and you don't like it, i'd like to trade my us style ss dp w/ you. i'm open to the hks dp as well w/ some cash for my dp, considering the hks is mild steel.
I had a FEED dp when i had stock twins. lil over 3 inches.. and the cobra neck does not hurt flow... It still has the same if not more surface area then a 3" circular dp. Installation is a breeze compared to any other us dp design out there.. flawless fit. I didn't realize it was goign for 600.. sold it for 230...
oh wellz.. single turbo now anywayz... good luck on your descision.
10-25-02, 05:12 PM
#50
Ex fd *****
Originally posted by IgoSlow
..you have more velocity with the two smaller straws then one of bigger or equal size..
..you have more velocity with the two smaller straws then one of bigger or equal size..
Flow = Velocity x Area
but with two pipes the surface area will be greater and thus there will be greater friction losses in the split pipe giving lower velocity and flow for a given pressure differential.
The reason a split DP may flow better is that 2 2.5" pipes have MUCH greater area than 1 3" pipe (36sqin vs 28sqin) but if the split pipe is made with 2" pipes it will have less area (25sqin) and flow less at a given pressure differential.