Welcome Guest [Log In] [Register]
Welcome to Altezza Club Of NZ/Australia. We hope you enjoy your visit.


You're currently viewing our forum as a guest. This means you are limited to certain areas of the board and there are some features you can't use. If you join our community, you'll be able to access member-only sections, and use many member-only features such as customizing your profile, sending personal messages, and voting in polls. Registration is simple, fast, and completely free.

http://s4.zetaboards.com/lexusaltezzaclub/topic/1148393/1/#new



Username:   Password:
Add Reply
Turbo Exhaust
Topic Started: Dec 3 2011, 12:22 PM (1,485 Views)
Blacktez
Lowered
[ *  *  * ]
Got my car back on monday 208.7kw at 10psi. Car was restricted by the standard exhaust system and it had very high back pressure. Just wondering what you guys recommend doing. I currently have a plumb back system for the waste gate into the 2.5" dump pipe to the stock mid with the cat and a 2.5" to 4" trust PE 2 cat back.

Should I:

One - go for a full plum back system but change to 3" full through
or
Two - Full 2.5" system with a full length screamer for the wastegate

Also Does anyone have a rear section turbo muffler they recommend.

Any help is appreciated.

cheers!
Offline Profile Quote Post Goto Top
 
Soiled Altezza
Member Avatar
...
[ *  *  *  *  *  * ]
I'd personally just replace the mid pipe to 2.5" as that would be the biggest restriction and see how it goes from there, although the seperate pipe for the wastegate would be pretty cool, what's the legality towards that?

That's a nice figure you have there for a factory engine :D good work.

When you say restrictive is it dropping boost at higher revs or what? What's happening?

Throw up your dyno sheet/video of your dyno run too will be good to see :D
Posted Image
Garage: http://altezza.dualzdesigns.com/viewcar.ph...wner=17&frmpg=0
Offline Profile Quote Post Goto Top
 
Blacktez
Lowered
[ *  *  * ]
That was the next step for me anyway. The full length screamer is fully legal in NZ as long as it is past the rear diff, has a hell of a noise to it though as you can imagine lol. The car had solid boost throughout and no drop what so ever the guys that tuned it just said that it had a huge back pressure and that i should look at replacing my exhaust system to gain further power.

on the other hand full boost only kicks in at 5000rpm with the t3/t4 which is a bit of a bore but when it does it gives a bloody big kick
Offline Profile Quote Post Goto Top
 
nz_climber
Lowered
[ *  *  * ]
I don't think it is legal.. as it wouldn't pass the noise tests.

Also to get a cert you will be required to run a cat convertor, and all exhaust gasses must pass through the cat.. So that means you need to run a plumbed in type system

See the document below:

http://www.lvvta.org.nz/documents/standard...s_Emissions.pdf
Building a Beams 3sge powered Mcgregor 7.

Check out progress (or lack of..) at http://www.lotus7.co.nz/forum/viewtopic.ph...957eb3663a85224
Offline Profile Quote Post Goto Top
 
supertezz
Member Avatar
3SGE+T = :D
[ *  *  *  * ]
A full length screamer would be awesome but I would get it certed then get it done and take out the cat while your there.
3SGE+T = :D

Posted Image
Offline Profile Quote Post Goto Top
 
nz_climber
Lowered
[ *  *  * ]
Which defeats the purpose of the cert as you car will be illegal again as it won't comply with the conditions and noise limits tested at the time of the cert!
Building a Beams 3sge powered Mcgregor 7.

Check out progress (or lack of..) at http://www.lotus7.co.nz/forum/viewtopic.ph...957eb3663a85224
Offline Profile Quote Post Goto Top
 
Blacktez
Lowered
[ *  *  * ]
The information i got for the screamer was from a certifier you are legally aloud to the run the screamer the full length of the car as long as it passes the rear diff and the width of the pipe does not exceed 2" This is also what the tuner recommended to me.

As for the cat I'm fairly certain you do not need a cat in the car as my last car hand a full 2.5" system with only one resonator and the exhaust past in the cert.
Offline Profile Quote Post Goto Top
 
Blacktez
Lowered
[ *  *  * ]
Plus isn't the vehicle testing rev at 4000rpm? While my gate would only open fully at 5000rpm
Offline Profile Quote Post Goto Top
 
Soiled Altezza
Member Avatar
...
[ *  *  *  *  *  * ]
Even at rev limit it wont open in neutral as you wont have enough load to build significant boost. Spooling at 5k would be horrible :/ get a new smaller turbo and just replace the middle section might lose a little top power but would be a shitload more fun to drive which is what its really about rather than a big number.
Posted Image
Garage: http://altezza.dualzdesigns.com/viewcar.ph...wner=17&frmpg=0
Offline Profile Quote Post Goto Top
 
Blacktez
Lowered
[ *  *  * ]
It does :( lol that was what i was thinking about doing. But the next question would be which turbo
Offline Profile Quote Post Goto Top
 
nz_climber
Lowered
[ *  *  * ]
When did your last car get a cert though, the cat rule has only been in since May 2010, you might be lucky the certifier might read the book a bit different and get the car past without a cat. (as there are a few exceptions)

Noise test is at 4800 rpm (according to the book)
Building a Beams 3sge powered Mcgregor 7.

Check out progress (or lack of..) at http://www.lotus7.co.nz/forum/viewtopic.ph...957eb3663a85224
Offline Profile Quote Post Goto Top
 
Blacktez
Lowered
[ *  *  * ]
december 2010. Im taking it to the same guy so hopefully i can sway it my way haha still the gate shouldnt be open till 5 hmm.
Offline Profile Quote Post Goto Top
 
Soiled Altezza
Member Avatar
...
[ *  *  *  *  *  * ]
Talk to companies that make and sell turbos, give them the application and power figure you want for your car/turbo and they will make suggestions.

But to be honest the TD04 from the GReddy kit is a great choice or one a little big bigger, just make sure to get a large exhaust housing or it will choke itself under revs.
Posted Image
Garage: http://altezza.dualzdesigns.com/viewcar.ph...wner=17&frmpg=0
Offline Profile Quote Post Goto Top
 
Leiden
Member Avatar
NZ, Whangarei
[ *  *  *  *  *  *  * ]
I'd go plumb back with straight through 3" to a decent muffler, that's all you need, throw in a 3" high flow resinator if its a little too loud for your liking..

Since you'll have a t3 flange why not get a rb25det turbo, if you can get one off a Neo R34 even better!

It comes on boost like a freight train and pulled all the way to redline on my 3sgte, I also had a t3t4 but it would come on boost alot quicker than 5000rpm, more like 18psi @ 3800... what manifold and exhaust a/r are you running?
Project Thread
Offline Profile Quote Post Goto Top
 
Blacktez
Lowered
[ *  *  * ]
Leiden,Dec 4 2011
10:04 AM
I'd go plumb back with straight through 3" to a decent muffler, that's all you need, throw in a 3" high flow resinator if its a little too loud for your liking..

Since you'll have a t3 flange why not get a rb25det turbo, if you can get one off a Neo R34 even better!

It comes on boost like a freight train and pulled all the way to redline on my 3sgte, I also had a t3t4 but it would come on boost alot quicker than 5000rpm, more like 18psi @ 3800... what manifold and exhaust a/r are you running?

That seems an easier option and was the second thing the tuner recommended. I may try source a Neo 34 turbo then. All i am aiming for hp wise is a flat 300 which would make me more than happy. Boost coming on at 5000 is already becoming a bore lol my A/R is . 50 A/R COMPRESSOR .63 A/R TURBINE.57 TRIM
Offline Profile Quote Post Goto Top
 
Blacktez
Lowered
[ *  *  * ]
something like http://www.trademe.co.nz/motors/car-parts-...n-428324525.htm shouldn't be to far off should it?
Offline Profile Quote Post Goto Top
 
Distrb
Member Avatar
Nuts
[ *  *  *  *  *  * ]
I'd sort the exhaust out before worrying about changing the turbo, as it sounds like it could be restricting it and hurting response, so changing the exhaust could bring it back to an acceptable level.

if i were you i'd be doing what leiden said and going 3" with decent sized resonator in the middle and a good muffler on the rear.
Offline Profile Quote Post Goto Top
 
madaltezza
Sleeper
[ *  *  *  *  *  * ]
i run a 3inch with my wastegate plumed back in if you want a turbo that is not lagey id go for a t28 or gt 30/76 garret but for a stock motor id say a go for sumthing like a t28 size will spool nice and make good power
Offline Profile Quote Post Goto Top
 
Blacktez
Lowered
[ *  *  * ]
Booked in for a full 3" Exhaust 6th of january. Hopefully will give me time to save a bit as i don't finish my course till 16th December :'(
Offline Profile Quote Post Goto Top
 
Leiden
Member Avatar
NZ, Whangarei
[ *  *  *  *  *  *  * ]
Ah just your run of the mill T3T4, same thing as I had but its weird that its coming on boost so late so it must have something to do with your exhaust,

I run a straight through 2.5" with muffler at the moment with externally venting wastey, looking at going 3" as I've been told the power limit for 2.5" is around 300hp at the wheels

That DSR430 would spool about the same as a T3T4 I'd think, I'd rather the DSR380 or even 330 if your after quick spool, will just need to redrill your flange or buy an adapter plate to make it T2
Project Thread
Offline Profile Quote Post Goto Top
 
Distrb
Member Avatar
Nuts
[ *  *  *  *  *  * ]
Leiden,Dec 6 2011
05:20 PM
I've been told the power limit for 2.5" is around 300hp at the wheels

depends who you talk to. there are numerous people at well over 300whp on a 2.5" inch exhaust without being held back, myself included.

no doubting that 3" is more effective, just fair folly to put a HP number on it.
Offline Profile Quote Post Goto Top
 
Leiden
Member Avatar
NZ, Whangarei
[ *  *  *  *  *  *  * ]
Thats good to know, bigger never hurts though :P
Project Thread
Offline Profile Quote Post Goto Top
 
Tezz-Winnie
Unregistered

Wrong thread maybe? Dude thats a Skyline!!! Judging your spool by the output on another motor is just as usless as compairing an LS1 in a street machine to those found in a comonwhore.

Completely different Exhaust CFM and not only that being a cheap and dodgy chinese manufacturer (Judging on the language used in the add) I guarantee that Skyline has had alot of work done to the head of that motor! Not that it would be hard to get to 14psi on an RB25DE NEO anyway!

Do your reasearch mate, you cant just slap a turbo on a car and expect results, you have to do the math.... Hearsay doesnt count for much either because everyones fish is always ttttttttttttttthhhhhhhhhhiiiiiiiiiiiiissssssssssssssssssss
big....
Quote Post Goto Top
 
1 user reading this topic (1 Guest and 0 Anonymous)
ZetaBoards - Free Forum Hosting
ZetaBoards gives you all the tools to create a successful discussion community.
« Previous Topic · Engines • Intakes • Exhausts · Next Topic »
Add Reply