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> EXHAUST MOD QUESTION, NEED URGENT HELP.

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unitron
post Mar 15 2019, 01:44 PM

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QUOTE(krazymy @ Mar 14 2019, 09:03 PM)
I know about straight pipe bro, people do that for track car, not daily use car ma.....
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My car daily use... de-CAT and straight pipe... don't even disturb the neighbors.
Used 2 different S-flow mufflers (locally made Everco & SC), the S-flow are even louder than my straight flow (Japan, Fujitsubo)
Lexichi
post Mar 15 2019, 02:50 PM

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QUOTE(krazymy @ Mar 14 2019, 11:47 PM)
Thank you so much for the info here bro.
The recommended setup here is actually similar with what I'm currently having, it's just that my piping is 2inch from head to toe, and it caused lacks of torque.
But I'm not 100% sure if it's all because of the piping itself, part of the reason could be de-cat?
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As I know, if your car engine CC is not that big, but your exhaust piping is too big for it, your car will lack of power.
kelvin_87
post Mar 15 2019, 03:59 PM

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share us your car mod stories, your mod seem interesting smile.gif

I am vios owner too, but I just got S-flow muffler changed only haha
4WD_er
post Mar 15 2019, 09:41 PM

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QUOTE(krazymy @ Mar 15 2019, 11:03 AM)
I don't quite understand what is a GAN GA+? I only know if it's GANJA...........
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Google Gan GA+

It's external chip that boost the horsepower
bo093
post Mar 16 2019, 07:57 AM

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QUOTE(krazymy @ Mar 15 2019, 11:01 AM)
I see...thanks for such detailed reply man!
You say 4-2-1 gives softer and broader powerband, how about the difference between long and short one?
I'm wondering why would you say the mid bullet is the biggest restriction? Because it's actually kind of straight and open inside..Just that it's got that fish scale thing..but it doesn't seem restrict at all?
Yea I know how the piping size would affect the performance but then I'm really confused whenver people talking about the piping size, are they talk about the inner diameter or outer diameter?
The 2inch I'm having now, the mechanic claimed that it's its outer diameter that is 2inch, the innter diameter is 1.8inch..But then I'm feeling lacks of low torque?
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Long 4-1? Short 4-1?
A long will give all the power at lower RPM
A short will give all the power at higher RPM

Fish scale like this?
user posted image
It may cause the restriction because they design to introduce backpressure.
Your 4-1 short may contribute to the lack of torque.
Usually is inner diameter.

Try asking around vios 1st gen specialist or people who actually race it.
TSkrazymy
post Mar 16 2019, 11:46 AM

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QUOTE(unitron @ Mar 15 2019, 01:44 PM)
My car daily use... de-CAT and straight pipe... don't even disturb the neighbors.
Used 2 different S-flow mufflers (locally made Everco & SC), the S-flow are even louder than my straight flow (Japan, Fujitsubo)
*
I know branded mufflet has its quality, sound good and not loud yet keeping the performance but I don't know it's even more quiet than the s flow? Mind sharing your setup bro?

TSkrazymy
post Mar 16 2019, 11:47 AM

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QUOTE(wkc5657 @ Mar 15 2019, 11:59 AM)
Did you remap/tune your ECU?
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Plan to do so after all mods are done bro. Is there going to be a significant difference?
TSkrazymy
post Mar 16 2019, 11:55 AM

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QUOTE(bo093 @ Mar 16 2019, 07:57 AM)
Long 4-1? Short 4-1?
A long will give all the power at lower RPM
A short will give all the power at higher RPM

Fish scale like this?
user posted image
It may cause the restriction because they design to introduce backpressure.
Your 4-1 short may contribute to the lack of torque.
Usually is inner diameter.

Try asking around vios 1st gen specialist or people who actually race it.
*
Yes it's similar to what you mentioned there. I see... thank you for telling me what it's for, much thanks for your valuable info! My exhaust mechanic told me to flip the mid bullet around it could lessen the backpressure and it's good for the top speed, is that true? And that's a shame I'm dancing on my own, know no specialist..
TSkrazymy
post Mar 16 2019, 11:57 AM

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QUOTE(Lexichi @ Mar 15 2019, 02:50 PM)
As I know, if your car engine CC is not that big, but your exhaust piping is too big for it, your car will lack of power.
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The thing is...I just don't know what's the optimal piping size for my setup.. Currently running 2inch piping from head to toe, inner diameter 1.8inch, outer diameter 2inch.

TSkrazymy
post Mar 16 2019, 11:59 AM

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QUOTE(4WD_er @ Mar 15 2019, 09:41 PM)
Google Gan GA+

It's external chip that boost the horsepower
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What's the difference between this and those other chips like Unichip, e manage bro?

TSkrazymy
post Mar 16 2019, 12:01 PM

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QUOTE(kelvin_87 @ Mar 15 2019, 03:59 PM)
share us your car mod stories, your mod seem interesting smile.gif

I am vios owner too, but I just got S-flow muffler changed only haha
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My recommendation would be, don't mod a full set exhaust system if you haven't. Change the extractor, mid bullet and muffler will do. That's what I've learned.. Anything else would be waste of money.
TSkrazymy
post Mar 16 2019, 12:03 PM

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QUOTE(JZenith @ Mar 15 2019, 11:30 AM)
please update me about sport cat, i've been looking for a quiet and smooth sport cat.
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As far as I know, a cat only reduce minimal of sound bro.. But then it's true it makes your ride smooth, I'm just not sure how does it gonna affect the top speed. I've already got it installed yesterday, haven't got chances to test it properly, will update you again if you are interested about it.

kelvin_87
post Mar 16 2019, 01:08 PM

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QUOTE(krazymy @ Mar 16 2019, 12:01 PM)
My recommendation would be, don't mod a full set exhaust system if you haven't. Change the extractor, mid bullet and muffler will do. That's what I've learned.. Anything else would be waste of money.
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the rest of mod have no effect?

Share us your stories and some photos too smile.gif
bo093
post Mar 16 2019, 03:45 PM

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QUOTE(krazymy @ Mar 16 2019, 11:55 AM)
Yes it's similar to what you mentioned there. I see... thank you for telling me what it's for, much thanks for your valuable info! My exhaust mechanic told me to flip the mid bullet around it could lessen the backpressure and it's good for the top speed, is that true? And that's a shame I'm dancing on my own, know no specialist..
*
You could flip it, is basically becoming a high flow bullet but without the function of absorbing sound.
As the 'fish scale' not facing the exhaust flow to capture noise/exhaust gas.
Might be good for top speed, as there is less restriction at higher rpm, so could contribute more HP to push.

I'm no specialist, just reading from internet and a few books on engine tuning.

If you have time and money sweat.gif , why not try part by part.
In the end, doing just your exhaust won't really solve it.
Those intakes are gonna be your next thing then hi-cam and etc. laugh.gif
Is all about making all the parts work together to achieve in what you need.
wkc5657
post Mar 16 2019, 09:09 PM

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QUOTE(krazymy @ Mar 16 2019, 11:47 AM)
Plan to do so after all mods are done bro. Is there going to be a significant difference?
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maybe, but i don't know how significant. The thing is that modding and tuning should be done hand in hand for the best results.

The current setting in the ECU is under stock condition, so by modding your intakes and exhaust, the sensor parameters could be quite off from the current default. If you mod shop can do complementary ECU remapping, that would really be great.
unitron
post Mar 17 2019, 09:09 PM

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QUOTE(krazymy @ Mar 16 2019, 11:46 AM)
I know branded mufflet has its quality, sound good and not loud yet keeping the performance but I don't know it's even more quiet than the s flow? Mind sharing your setup bro?
*
4-2-1, de-cat, straight flow exhaust.

Oh.. if any shop talk about backpressure, you can be 120% sure the fellow talking cock.
There is no exhaust flow specialist in Sunway area.
There are exhaust pipe fabrication specialist... doesn't mean they know a single thing about flow. Just their trial and error on customers cars

think about it.. back pressure means your engine need to work harder to push the exhaust gas out. You want maximum scavenging to pull
all the old gas out from the combustion chamber and help pull in new fresh air/fuel mix.

Car manufacturers need to meet strict global and the specific country emission standards, so the exhaust design is to minimize the carbon emission and other toxic fumes
So it's a compromise between power and emissions. But if you want pure power it's totally different. You see drag car design caring about backpressure ?

Anyway it's just my opinion as an engineer and changing many different exhaust setup for my cars, no need to listen or believe.
Marcus95
post Mar 17 2019, 11:30 PM

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QUOTE(krazymy @ Mar 15 2019, 11:02 AM)
I will let you know what do I currently have in my setup:

4-1 header(short)
DE-CAT
Mid swirl bullet
Mugen twinloop
2inch piping from head to toe

The sport cat you mentioned, I bought it, it's already on the way!
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What was vios stock piping diameter? I don’t think is 2’ right?
JZenith
post Mar 18 2019, 08:52 AM

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QUOTE(krazymy @ Mar 16 2019, 12:03 PM)
As far as I know, a cat only reduce minimal of sound bro.. But then it's true it makes your ride smooth, I'm just not sure how does it gonna affect the top speed. I've already got it installed yesterday, haven't got chances to test it properly, will update you again if you are interested about it.
*
i once drove a guy's hyundai atos, totally no lag while revving RPM compared to a normal atos, quiet during low and high RPM and the exhaust tip was 8".
whole system was about not over 1.1k
regret didnt ask about the installation shop / brand
Chyan
post Mar 19 2019, 01:20 PM

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QUOTE(krazymy @ Mar 15 2019, 11:02 AM)
I will let you know what do I currently have in my setup:

4-1 header(short)
DE-CAT
Mid swirl bullet
Mugen twinloop
2inch piping from head to toe

The sport cat you mentioned, I bought it, it's already on the way!
*
Is your Mugen Twinloop re-con or rep? How is it sound wise? I'm not a fan of blardy noisy fart-cans.

TSkrazymy
post Apr 15 2019, 03:47 PM

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QUOTE(unitron @ Mar 17 2019, 09:09 PM)
4-2-1, de-cat, straight flow exhaust.

Oh.. if any shop talk about backpressure, you can be 120% sure the fellow talking cock.
There is no exhaust flow specialist in Sunway area.
There are exhaust pipe fabrication specialist...  doesn't mean they know a single thing about flow. Just their trial and error on customers cars

think about it.. back pressure means your engine need to work harder to push the exhaust gas out. You want maximum scavenging to pull
all the old gas out from the combustion chamber and help pull in new fresh air/fuel mix.

Car manufacturers need to meet strict global and the specific country emission standards, so the exhaust design is to minimize the carbon emission and other toxic fumes
So it's a compromise between power and emissions. But if you want pure power it's totally different. You see drag car design caring about backpressure ?

Anyway it's just my opinion as an engineer and changing many different exhaust setup for my cars, no need to listen or believe.
*
I think I started to agree with you even more after putting back in a high flow cat-con. Below was my initial setup:
4-1, de-cat, swirl bullet and mugen twinloop muffler at the back.
I thought adding in back a high flow cat-con would making the car more powerful but then after almost a full month I realised that exhaust gases are getting harder to push than before. It becomes even more obvious when you are in high speed say around 110km/h or above.
I'm now just going to live with the current setup till I find the perfect solution.
F.Y.I. , my current setup:
4-1, high flow cat-con, swirl bullet, mugen twinloop.
What would you recommend for a all around setup?
I drive 50% city and 50% highway,sometimes I do going up to Genting highland as well. I'm thinking about selling away the newly bought cat-con.


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