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Zorst? 3" Vs 4"

yogibear

By yogibear,
in Engines & Forced Induction

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N1GTR Grand Master

N1GTR

Posted
Posted

Lol, not much of a race the person doing mine takes off on holidays tomorrow hahaha

Mines got 2 mufflers aswel, other is in the box.

Still, I got the motor in the car so that has to be a headstart haha

N1GTR Grand Master

N1GTR

Posted
Posted
is it actually possible for a 4" straight through muffler to really do any muffling at all? Even if the oval was 1 meter wide on its own it would still do bugger all surely?

People with more knowledge than I have in this area have sorted it out for me so it's quiet and flows like a drainpipe

I don't mind a bit of noise, just want all the flow possible. Time will tell

N1GTR Grand Master

N1GTR

Posted
Posted
Having the motor on the stand is a minor detail :whistling:

Lol!

"it never ends"

Btw you know my carbon Kevlar seat, do you want it? I want a different one and want to sell this before buying another so I'm not stuck with two. You know what it's like at mine with parts and space

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
Not true at all, at top end when you are making that kind of power a whole lot of exhaust is bypassing the exhaust via the wastegate...

3" on 26 with T04z regularly make between 430-470rwkw

Depends if you are external or internal – either way, bigger does no harm at all.

Garrett engineers on their website clearly state that the less restriction after the turbo the better. Sure this needs to be weighed up with physical limitations and noise levels etc. But a greater flowing exhaust can only improve response and top end power. Obviously, whether its even noticeable depends on your power levels but at 400rwkw I think it would be very noticeable.

Just because some cars manage to get 400rwkw through a 3" exhaust doesnt mean they couldnt be a heap better with a larger exhaust.

Min 3.5" IMO

Couldn’t agree more.

I’ve seen cars make 350rwkw with a 3” as well. Swap it over to a 3.5” and boom, another 15-20rwkw and better midrange. Some are users here (some have also posted, which is good)

Just because it makes the power, you can get a 3” to 400rwkw no problems, doesn’t mean that putting something bigger will not provide benefit.

is it actually possible for a 4" straight through muffler to really do any muffling at all? Even if the oval was 1 meter wide on its own it would still do bugger all surely?

Well with 2x 3.5” straight through mufflers (they are massive), I’m around what, 90dB, so it must be possible :whistling:

Mufflers weren’t cheap, but they certainly have some effect.

would there be any power gains for a 170rwkw by changing from 3" to 3.5" cat back but keep the 3" dump/front/cat?

no mufflers btw

Not really no, 3” with little bends and straight through mufflers is plenty for up to 250-300rwkw.

All you get is noise @ that level.

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