Jump to content
SAU Community

Recommended Posts

I'm fairly confident that depending on the amount of boost it can vary on the amount of extra power gained, a full 3" turbo back exhaust can gain up to an additional 15kw. With more boost this setup would allow the exhaust to flow a lot more than standard setup, I can strongly recomment getting a 3" dump/front and a highflow cat, the standard dump/front pipe are pretty dam restrictive.

I have had a mate back to back a highflow cat to a straight through cat (illegal) and picked up 5kw.

Link to comment
https://www.sau.com.au/forums/topic/62990-rear-muffler-kws/#findComment-1185988
Share on other sites

Thanks for the feedback.

I have a kakimoto cat back on a the moment (3/12 inch) with standard dump/front.

I have a 3" dump/front ready to go on but I'm thinking of picking up a stock cat back. The kakimoto is fairly quiet but I have recently driven a few stock skylines and like the quieter exhaust.

So how much would I lose running fairly stock boost on RB25DET (7psi) by putting the stock cat back on rather than the kakimoto?

Would it be a fairly even power trade if I put the 3" front pipr/dump on rather than having a good cat back section?

Thanks

Also how restrictive ar the standard nissan rear mufflers? Are tey universal between all the turbo nissans? if you chopped out the first rear muffler/resonator would the system still be quiet yet flow better?

Link to comment
https://www.sau.com.au/forums/topic/62990-rear-muffler-kws/#findComment-1186153
Share on other sites

the stock cat/muffler back is quite restrictive and you will lose lots of power. dotn bother putting a large dump/front pipe if you are going to remove the cat back.

just change the muffler on your cat back to one that is quieter, i have a turbo back 3' exhaust and you can barely hear it from inside, it has a normal straight through muffler(not a canon) and a resonator

Link to comment
https://www.sau.com.au/forums/topic/62990-rear-muffler-kws/#findComment-1186226
Share on other sites

thanks Siks. Do you know which part is restrctive? the fact that it is 2.5" or the resonator/middle muffler or the rear muffler.

I tought the dump was the most important though? Not true?

Mines prety quiet in the cabin, just people notice it when your in the carpark or something. Not real loud but people do turn around sometimes...

Link to comment
https://www.sau.com.au/forums/topic/62990-rear-muffler-kws/#findComment-1186236
Share on other sites

hey,

the whole std cat back is restrictive ie bends, size, and muffler.

standard gtr muffler is similar, and is also quite restrictive, it is a twin exit muffler like on the gtst...dont bother.

the dump is not the most important part, thats probably the least important... biggest difference will be made with a good catback and muffler, (which you have already) so keep that and fit a good dump/front pipe and u will gain power.

Link to comment
https://www.sau.com.au/forums/topic/62990-rear-muffler-kws/#findComment-1189449
Share on other sites

I have a fujitsubo cat back back which made about 10-15 rwkw extra when stock and is pretty quiet. I asked for a quiet one and got it. Has two mufflers that flow well but keep the noise down.

Later I put a split dump on for more power but I didn't try dump with original zorst sorry. Seems a bit silly to me.

Link to comment
https://www.sau.com.au/forums/topic/62990-rear-muffler-kws/#findComment-1189732
Share on other sites

ben, the main gain is from the pipe, although mufflers definetly make a difference ie stock muffler compared to a straight through muffler.

noise is mainly to do with the muffler, not the pipe, so if you fit the stock pipe and a straight through muffler it will be defeating the purpose of making it quiet.

unless you want to lose lots of power, leave it how it is (catback) and if you are really set on making it quiet, if it has a canon definetly change it to a normal straight through muffler.

Link to comment
https://www.sau.com.au/forums/topic/62990-rear-muffler-kws/#findComment-1190611
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • The German place in Cabramatta was rock solid, fresh pretzel cooked to order back then. Then it went all quiet, after all the poker machines were removed, then I believe it closed for good. I did drive past the other week and noticed outdoor lighting a big screen, but no idea what is there now.  
    • Yeah I suspect even if you hold airmass per cycle/cylinder constant if you get too far away from stock you're still going to have problems running the factory tune within the bounds of the factory load scale. Cams, different displacement/rod ratio, etc. I'm just lucky that the GTIII-SS with wastegate boost + CA compliance cats is pretty much equivalent to stock turbos. When I have actual space I can finally get it tuned and modify the fuel system for flex fuel to 100% handle any detonation concerns when cranking the boost to whatever those dinky turbos can put out.
    • I would say no, why, because my daughter, who also lives in Goulburn, hasn't recommended us going there Pity, as we miss all the German joints around in Sydney, actually, the restaurants are the only thing I really miss about Sydney, and a special mention to Ishibanboshi at Bondi Junction, their Kara-age Don is heart cloggingly deliciousness (always added a special boiled egg...or 2) 😋 
    • Does that German restaurant still exist in the old place out the NW end of Goulburn? When I say "out the NW end of"...I am really being vague. It was 1997 when I was last there, and the only point of reference I can recall is that it was on the opposite side of the main drag from the big merino. And when I say "opposite side of the main drag", I don't mean "on the main drag". It was either a couple of streets back from there, or might have even been out in the sticks a bit further. Was an old farm building or mill or somesuch. And when I say "the big merino" I might actually be thinking of a completely different part of town, because I just looked on maps and the big bugger is not where I remembered him to be! The food was good, consisting largely of various German mystery-meat sausage/loaf things and kartofflen.
    • So while the second sentence is completely correct and the whole point of the conversation, the first sentence bears consideration. If this bloke is just hoping to throw big turbos on and drive it around, because there are no helpful facilities at all in his tropical paradise** then he likely has zero chance of even knowing what the TP is on the last column in the stock maps, let alone know whether the ECU is operating anywhere near it or past it. So the point is very very moot. And, per what I said before, at stock boost on those turbos, you may well be off the end of the map. **I'm just back from Vanuatu, so I know exactly what small Pacific nations can be like wrt paradise without requisite facilities. But it's not even that simple. I put a high flow on my car and had to drive it around without a proper tune because of the lack of opportunity*** to put the bigger AFM and injectors into it to allow it to be tuned. I had to turn the boost down to less than I had before, and back off the boost controller's ramp, because it was exploring parts of the map that it didn't drive in before, and really couldn't access for tuning on the dyno either, and so was pinging. It was still well within the last column, because when I first**** set up the Nistune on the Neo I rescaled all axes of the maps to give some more space to explore. ***Family dyno was broken ****This was 13 years ago, and the TIM thing wasn't a thing then and so TP would definitely grow when pushing past the stock tune's limits.
×
×
  • Create New...