exhasut mod - follow up question
#1
exhasut mod - follow up question
So I've been thinking about modifying the factory exhaust on my SC300 (without spending a lot). I was looking to produce just a little more volume and flow. So today i had the second cat removed and straight pipe put in its place (if anyone was wondering it only cost $75 to do), before i got it done I already figured I would loose a little bit of low end torque, which it turns out I did.
So my primary question is anyone have any good suggestions to add a bit of back pressure back into the system without decreasing too much flow... Also I didn't get as much volume as I was looking for so I'm also looking at deleting the resonators and just having the primary CAT and mufflers.
thanks guys
EDIT: if you aren't reading all the posts I've realized my problem isn't back pressure but exhaust steam velocity... any input on how i can achieve a high ESV with the new lower back pressure I have would be great
thanks
So my primary question is anyone have any good suggestions to add a bit of back pressure back into the system without decreasing too much flow... Also I didn't get as much volume as I was looking for so I'm also looking at deleting the resonators and just having the primary CAT and mufflers.
thanks guys
EDIT: if you aren't reading all the posts I've realized my problem isn't back pressure but exhaust steam velocity... any input on how i can achieve a high ESV with the new lower back pressure I have would be great
thanks
Last edited by CrimsonSC3; 02-05-11 at 02:37 PM.
#2
Instructor
iTrader: (1)
in order to gain some exhaust velocity to regain torque, you could get a header that replaces the primary cat. A header is pretty cheap (OBX) and works until you have the $$$ in the future to go turbo.
You didn't say if you had an exhaust or not. If you are still running a stock exhaust, that could be your problem...
You didn't say if you had an exhaust or not. If you are still running a stock exhaust, that could be your problem...
Last edited by 1997Soarer; 02-05-11 at 12:15 PM.
#4
in order to gain some exhaust velocity to regain torque, you could get a header that replaces the primary cat. A header is pretty cheap (OBX) and works until you have the $$$ in the future to go turbo.
You didn't say if you had an exhaust or not. If you are still running a stock exhaust, that could be your problem...
You didn't say if you had an exhaust or not. If you are still running a stock exhaust, that could be your problem...
you can gain power without gains or loss to the torque... and like i said its just the low end i felt the loss in... and yeah i thought that i should have just left it alone but oh well... now just to figure out what i can do for a little bit of back pressure
#5
after doing some other reading its not necessarily the back pressure i need to be worrying about... more so high exhaust stream velocity... what im experiencing right now is low back pressure with low exhaust stream velocity... so now i need to figure out how to remedy this issue... a thought i had is that even though the diameter of the pipe is factory size, with out the cat there the stream velocity make be to low now... so looking into a slightly smaller diameter pipe might help me solve this
#7
if anyone has any experience with exhaust systems and the type of manipulation that im talking about, input would be greatly appreciated
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#8
Lead Lap
iTrader: (2)
I think putting in a smaller pipe is your best bet. The stock piping was sized to achieve high velocity with the backpressure of all the installed components. Now with less backpresuure you need a smaller pipe to maintain the correct velocity. Even though its counter intuitive paired with everything we learn about how to up a cars performance its a simple concept of flow dynamics. Ask a plumber about the importance of have a properly sized sewer outfall. The line has to be big enough so that the drains inside don't back up but small enough to have enough speed to move solids effectively down the line.
#9
I think putting in a smaller pipe is your best bet. The stock piping was sized to achieve high velocity with the backpressure of all the installed components. Now with less backpresuure you need a smaller pipe to maintain the correct velocity. Even though its counter intuitive paired with everything we learn about how to up a cars performance its a simple concept of flow dynamics. Ask a plumber about the importance of have a properly sized sewer outfall. The line has to be big enough so that the drains inside don't back up but small enough to have enough speed to move solids effectively down the line.
#11
i wasn't trying to mess with the headers or mufflers right now... but i will def look into something like that in the future... plus i have a 9mo girl and dont want the exhaust too loud because she falls asleep in the car all the time... on a side note some people think its odd i purchased a SC300 for a family car but my MK3 supra was only a two seater
#14
Lead Lap
iTrader: (2)
I don't know what the inspection laws are like in Florida usually as long as you are past the cat you can use clamps instead of welding things in. You could take out the straight section you put in and use clamps and reducers to find the correct sizing and then have it welded in when you do.