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2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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this should answer all of your questions on whether or not a 3 inch exhaust is worth while on a turbo car. i previously tuned the car on 12psi and 15psi. with the new exhaust system i couldnt get the boost to go below 15psi.....(lovefab manifold with 38mm wastegate) so it made a perfect over lap of 15psi of 2.5 inch exhaust and 15psi 3 inch exhaust.
car is a stock bore H22 with love fab manifold, stock intake manifold, 2.5 downpipe, a custom 3 inch exhaust i did.....greddy intercooler with very restrictive intercooler piping. 93 octane pump gas. and stock cams
Absolutely NO changes done to the car other than the exhaust. NOTHING.
the little dip in the midrange is from very rich air/fuel in that area. the MSD took a crap during the dyno session so i dint get to clean that up. very minimal timing and rich and safe air fuel. needless to say, he was very pleased with his new exhaust system 
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4doorEG
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(Post Master Sr)
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02/16/06 07:06 PM
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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That's only because it's a vtec engine 
Was this the dual exhaust setup you did for the car?
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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haha! yup thats the one
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SiAdam
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(Post Master Supreme)
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02/16/06 10:28 PM
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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I am glad you posted this Joe...
Fine example...
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Very impressive! How do you think it will do with a JRSC?
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HCivic02
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(Post Master Supreme)
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02/16/06 10:44 PM
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Quote:
Very impressive! How do you think it will do with a JRSC?
loose you power. Stay with 2.5.
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Things don't work quite the same with superchargers.... freeing up backpressure doesn't have the same benefits as on an app. where you're pushing a turbine.
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Thanks for the advice, guys. I'll stick with what I have.
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HCivic02
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(Post Master Supreme)
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02/17/06 01:20 AM
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Quote:
Thanks for the advice, guys. I'll stick with what I have.
if you have a stock exhaust step up to a 2.5"
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OLDNAME
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(Post Master Sr)
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02/17/06 06:29 AM
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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nice..shit over 70whp. but is that due to higher boost level.
man I wish I can bare the noise of the 3' dp though. arrrh.
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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no the boost level is exactly the same, 15psi on those 2 runs.
with the smaller exhaust i had a "low boost" and "high boost" settings, with the wastegate placement i was unable to go below 15psi this time.
i took the old 15psi chart and over lapped the new 15psi chart, so no change it boost.
the same 2.5 inch downpipe was used for both runs you see as well.
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SiAdam
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(Post Master Supreme)
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02/17/06 08:28 AM
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Quote:
nice..shit over 70whp. but is that due to higher boost level.
man I wish I can bare the noise of the 3' dp though. arrrh.
I am running a 3" and it isn't loud @ all...
3" d/p into a flex, into a resontator and muffler...
Sounds good...
Outside sounds solid, not raspy, inside there isn't any droning..
Actually surprised it sounds as good as it does...
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OLDNAME
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(Post Master Sr)
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02/17/06 08:35 AM
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Good stuff TC. Man if I had the time I just go straight 3' from DP-ext. But I did that back in 2001yr. Besides the boost spike ranging from 3-5psi and man...it was just too damn loud. I used to work club security and would come home pretty late 4-5am. and my neighbors always bitch that they could hear my car.  
so its been 2.5-3' evott for me. the sound is like stock. cant complain.
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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What about low boost applications like 5-8 psi? Due to budget reasons, I'm going to run the sucky Greddy downpipe and a 60MM (2 3/8") exhaust. I want to upgrade the downpipe to a 2.5 in the future, but not sure about the exhaust.
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SiAdam
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(Post Master Supreme)
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02/17/06 10:43 AM
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Quote:
What about low boost applications like 5-8 psi? Due to budget reasons, I'm going to run the sucky Greddy downpipe and a 60MM (2 3/8") exhaust. I want to upgrade the downpipe to a 2.5 in the future, but not sure about the exhaust.
You could run a 1/2" exhuast...would it work yea...how effective would it be is the question...
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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I don't know about that. A half inch might stall the car. 
I would love to see a comparison test on a car runing 7psi.
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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You like it when other people waste their time for your satisfaction, huh.
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TypeSlow
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(Post Master Jr)
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02/17/06 01:47 PM
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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good stuff TC. how about anything on 3" exhaust and 3.5" or 4" e-cutout?
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Quote:
You like it when other people waste their time for your satisfaction, huh.
And what is that suppose to mean?
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SiAdam
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(Post Master Supreme)
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02/17/06 03:26 PM
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Quote:
good stuff TC. how about anything on 3" exhaust and 3.5" or 4" e-cutout?
I have a 3" and installed a cutout, I gained some more tq but not a huge improvement on hp?
Just my experience though...
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ChewiSi
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(Post Master Sr)
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02/17/06 06:20 PM
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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My 3 inch just drones like crazy from teh inside when I am anything over 17% throttle. but I can live with it. Might have to add a resonator here sometime.
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Quote:
Good stuff TC. Man if I had the time I just go straight 3' from DP-ext. But I did that back in 2001yr. Besides the boost spike ranging from 3-5psi and man...it was just too damn loud. I used to work club security and would come home pretty late 4-5am. and my neighbors always bitch that they could hear my car.
so its been 2.5-3' evott for me. the sound is like stock. cant complain.
whaa? where did you get the EVO TT from, i've been looking for it but nobody has it yet, as if it's not yet out for the EM1
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SiAdam
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(Post Master Supreme)
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02/18/06 01:30 AM
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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Quote:
My 3 inch just drones like crazy from teh inside when I am anything over 17% throttle. but I can live with it. Might have to add a resonator here sometime.
I bought my resonator from summit...
Cheap, works like a charm...
Follow the link in my sig for a few links to some vids where you can hear the exhaust note, inside and out...
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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any coupe/sedan 96-00 civic can use the same exhaust IIRC.
Resonator would be a great addition.
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SiRocket
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(Post Master Sr)
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02/18/06 02:00 PM
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Re: 2.5 vs one of my custom 3 inch exhaust (dyno graphs)
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my 3inch on my vortech was horrid, but thats because it sounded like a damn all motor car as it is in between the mix... lol... can't wait to have my 3inch d/p going into that exhaust now
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back from the dead.
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Well I finally upgraded my exhaust. Prior to this upgrade, I was using a Greddy SP, the baffle in the muffler is blown, and I have a blown cat too. I ended up buying a 3" Kteller exahust, 3" test pipe, 18" resonator, and The 5x8 magnaflow muffler from kteller, bolted up to a spoolin performance 3" downpipe...  This thing is F'ING LOUD!!!!! I dont know how your guys can drive with the Kteller setup, the interior is louder then the exterior. Low rpm cruising @ 2500-3500rpm is just drowing! the power increase is insane though, a much more noticable difference and I"m only running 6psi on a greddy kit. I need to come up with a solution, or I'm selling this thing too loud! This is my daily driver so it's irritating.
here's a vid (cold start & idle)
http://videos.streetfire.net/video/FB7316E7-E86A-41FF-8343-7969FA24F56A.htm
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caRRRR
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(Post Master Jr)
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03/20/06 09:11 PM
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Re: back from the dead.
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which is your vid? a bunch of other vids came up... and what's with the girl fingerin herself in the middle of car vids? LOL
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ChewiSi
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(Post Master Sr)
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03/20/06 09:16 PM
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Re: back from the dead.
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LMAO. ha ha fucking hilarious that theres a vid of a girl fringering herself. but your exhaust is pretty loud. i bet mines louder, i don't have any resonators.
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caRRRR
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(Post Master Jr)
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03/20/06 09:27 PM
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Re: back from the dead.
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i didn't find it... 
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Re: back from the dead.
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chewbaccasi, didn't you get a vibrant 3"? I think you posted a vid of it before but I dont remember. no resonator, sheesh... your crazy. maybe it's because I'm used to Greddy exhaust systems
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caRRRR
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(Post Master Jr)
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03/20/06 10:05 PM
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Re: back from the dead.
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sounds like a V6 with flowmaster or something. you should get a vid of it revvin up a little.
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Re: back from the dead.
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thermal 3" is super quiet even with no resonators or cat
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ChewiSi
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(Post Master Sr)
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03/21/06 12:01 AM
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Re: back from the dead.
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heres the link again, its not as loud from the outside as it is on the inside. Drones on the inside.
revving
http://media.putfile.com/DSCF288337
brake boosting= hell on clutch?
http://media.putfile.com/rollin263
Quote:
thermal 3" is super quiet even with no resonators or cat
i think its the muffler on the thermal exhaust that quiets them down.
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