single or twin turbo for RB26

[Sydneykid]

Surely one would see better use on a Canter than a Skyrine? ><

Ummmmmm.................thinking....................Canter, that's a Mitsubishi, so it would be a Trust turbo then. :wassup:

[blk180]

Hey sydkid did u find any great differnts in spool time from normal turbine to titanium turbine

thanks Brad

[Sydneykid]

Hey sydkid did u find any great differnts in spool time from normal turbine to titanium turbine

thanks Brad

Hi Brad, I ordered it that way from Innovative, so I have no basis of comparison.

[DoughBoy]

My bad, ok I did my homework to find out what it would have gone on.....

Hahaha, go the John Deere products!

p.s. Been waiting a while to throw the Truck turbo comment at you

[Morgs]

T66? Why would someone use an old truck turbo design on such magnificent late model technology cars? Surely one would see better use on a Canter than a Skyrine? ><

[DoughBoy]

Hey Farmer Joe, that cotton field looks 'bout a'ready to be a' picken. Yeehaaw.

[doubled]

I dont know if anyone has mentioned it and i don't know if Brian is woried about it

or if anyone else is but with a BIG single can the RTA road transport authority give you a defective vehicle for a big single?

I dont want to get into the argument of 1big or twins but i would hate it to get it all together and have our friendley "BOYS IN BLUE" come and tell you that you have a defect note, i dont think the insurance company will approve a payout when they pop the hood and see somthing like a T88 staring at them!!

[Sydneykid]

I dont know if anyone has mentioned it and i don't know if Brian is woried about it

or if anyone else is but with a BIG single can the RTA road transport authority give you a defective vehicle for a big single?

I dont want to get into the argument of 1big or twins but i would hate it to get it all together and have our friendley "BOYS IN BLUE" come and tell you that you have a defect note, i dont think the insurance company will approve a payout when they pop the hood and see somthing like a T88 staring at them!!

The reality is you are not allowed to do ANYTHING, if that worries you, then don't do ANYTHING.

[doubled]

I understand what you are saying SK, I also notice that most of the photos you are showing are from "TRACKS"... (the one above)

Most of the others are not... and i aknowledge that you are not allowed to modify vehicles very far but you can upgrade things like

Fuel pump (in tank)

injectors (in head)

PFC (behind kick pannel & in glovebox)

cams (cam covers)

exhaust (within reason)

and to a certian extent twin lowmounts (like 25/30, GTRS), on the original manifolds

and your vehicle is capable of some awsome HP and without attracting ANY undue attention from the authorites, I drive for a living and around the southern sub's of brissie and even over the NSW border you have RTA setup like clockwork.. and "ALMOST" every time i go past one there is an IMPORT with the bonnet up and a 19-25 yr old looking at the cops (not knowing whats wrong with their vehicle)

I would hate to spend upwards of 3g only to find it gets a defect the first time the screemer pipe opens up. :Oops:

[lwells]

i aknowledge that you are not allowed to modify vehicles very far but you can upgrade things like

Most of the things you listed you are not allowed to modify without engineering. The only reason you get away with it is because they are hidden, or the cop doesn't care or know what they are looking for.

With a big single its going to be high mount, which means it will be obvious as soon as the bonnet is popped.

LW.

[slow13dude]

Most of the things you listed you are not allowed to modify without engineering.  The only reason you get away with it is because they are hidden, or the cop doesn't care or know what they are looking for.

With a big single its going to be high mount, which means it will be obvious as soon as the bonnet is popped.

LW.

Assuming the cop can pick the difference between a GTR and a GTST and knows that the GTR should have 2 turbos.

[R31Nismoid]

people here have been pulled over, and Vic being the worst.

Most of the time the big single isnt a problem.

Only is if you give em attitude or they do you for misbehaving on the street

[dangerous_daveo]

people here have been pulled over, and Vic being the worst.

Most of the time the big single isnt a problem.

Only is if you give em attitude or they do you for misbehaving on the street

Just like anywhere else. If you dont give them a reason to pull you over, you most likely wont be.

Wearing clothing that doesnt fit, with your arm out the window listening to 'thug rap' really loud and a hat on, expect to fit in to the stereotype and get pulled over.

I havent been pulled over in over 12months in my bright red loud import.

Anyway back on topic.

What about a single that is equal? As in the front and rear is the same, wheel size, housing size etc? Now assuming the turbo is set up correctly to say something that is more off set, but still suited properly, which would be better?

[discopotato03]

What a controvercial topic . I think its possible to argue either case or should I say back either team .

IMO its not relevant to compare in line 4's to inline sixes because of their firing order and 180 vs 120 degree crank phasing .

There is something to be said for two waste gates and their flow potential particularly given the 3 cylinders and the mass flow from them . I've often wondered if the twin turbos for FIA Grp A used restrictors or was it the blow off valve that limited maximum boost . Also importantly exhaust manifold design , the short three branch may have less potential flow restriction and heat loss than a divided 3+3 into 2 single turbo design .

At the end of the day I'm going with a med-large single to get around the plumbing nightmare that exists with twins . With 3 litres and an RB26 top end I think a GT3540R possibly with an integral gate should be fine . I'm not that concerned what it'll look like but factory as much as is practical . I don't need race pace just nice lazy torque and enough squirt to keep the Commos and Coons in their rightful place (rearview mirror) lamenting in their expensive mobile lounge sweets ..........

Cheers A .

[Sydneykid]

Interesting topic indeed, some alternative views for thought stimulation;

There is something to be said for two waste gates and their flow potential particularly given the 3 cylinders and the mass flow from them .

I want most of my exhaust to drive the the turbine, not out the wastegate and waste all of that energy. I reckon one wastegate is all I would need, in fact zero wastegates has appeal.

I've often wondered if the twin turbos for FIA Grp A used restrictors or was it the blow off valve that limited maximum boost .

They had a blow off valve that was bolted onto the plenum and limited the boost. Sorta like a Champ Car.

Also importantly exhaust manifold design , the short three branch may have less potential flow restriction and heat loss than a divided 3+3 into 2 single turbo design .

Yep, but they have uneven firing, I reckon an extractor flow 6 to 1 would be better if tuned correctly. Sorta like the R31GTSR homologated exhaust manifold.

At the end of the day I'm going with a med-large single to get around the plumbing nightmare that exists with twins.

That's pretty much the same reasoning as I went for.

[GTR_JOEY]

Oh god (face palm)

[Lithium]

Nooooooooot

[DVS JEZ]

Stop trolling. Its getting annoying

[kitto]

Stop posting useless, un-informative posts with zero factual information.

People do not appreciate it and you get disliked very very quickly.

[hypergear]

Not really, 1.3L 3cyc per turbo V 2.6L 6 cyc per turbo.

Also turbo shuffle in the twin setup is also pretty annoying.

I recon that I can make a jig for a bolton single turbo suitting a Rb26dett if I can get hold a GTR for few weeks.