Xr6 Twinturbo!

[orangeute338]

gt30 is rather larger for twins if you want to have low to mid power, I would think it would spool later then standard turbo, you would want something more like twin gt28rs as with anything you have to choose low down or up high....twins might spool slightly faster but some think slower, yeah the turbo is smaller but you have only half the gas pushin it....you have to look at the size of the wheels and shaft etc....single turbo one big fat shaft to spool up, twins the shafts arnt that much smaller but theres is only half the gas pushing them so you might actualy have more inertia in 2 turbos then compared to one....turbo choice is an art so many factors, when twins would be good is if you had to have twin gt45s cos one isnt big enough;)

when u have hook up some sort of sequential system to make the most of twins then it can be better but straight out twins wouldnt be if anything better then a single....stock turbo is pretty good all round, spools early and can still make 400kw

[orangeute338]

where do you put the o2 sensor? guess probably doesnt matter to much just in one dump pipe?

[4DZILR]

JUST DO IT BROOOOOOOOOOOO!! LMAO

:buttrock: :buttrock:

[xr6twin]

my o2 sensor just went in one of the dump pipes, if you look at the exhaust setup on a N/A set of aftermarket extractors the o2 sensor is at the point where the first 3 cylinders merge into one collector, essentially this is what my setup does. first 3 cylinders meet at a collector then through the turbine housing then out the dump where the o2 sensor is located.

The two turbos used in my build are t04e, they spool up very early, makes 8psi @ 2700rpm, plenty of potential to go bigger.

Im not going to argue that they are better or worse then a large single turbo, seeing as ball bearing technology can see a gt40r spool as early as my twins do, but at the same time im still running N/A compression which would give spooling response a head start over a lower comp turbo engine.

The whole idea behind building a twin turbo xr6 was just to be a little different to most every other xr6t out there, and see if it could be done in my workshop at home.

Its a project, and its been a good leanring experiense being able to build it, and the end result is very satisfying. Only benefit over a single turbo setup is mainly the WOW factor when you open the bonnet and people arnt expecting to see a twin setup.

[Slymeat]

Disregard I found the pics.... Edited 25/06/10 01:47 AM by Slymeat

[orangeute338]

hows the n/a cams go with the turbos? I got a na motor im gona build up with twins(maybe 35/40 and a 28rs) thinkin about just gettin the valve springs and see how the na cams go..

8psi at 2700rpm...what gear is that in though?

I just got 35-40 and can get 10psi before then and have 15psi by 3k...2nd gear I just had a quick look on a vid I have

[xr6twin]

cams r fine, the vct can be tuned to suit the application. I was gunna do cams but was told the amount you pay to tune an aftermarket cam in these engines isnt worth the power you will get out. highly recommend replacing the valve springs, they r the weak point in these engines.

its controlled to 8 psi, probably wood go more if the boost controller was set higher, once the internals hav been replaced ill be running 16psi n ill let u kno wen it makes full boost.

good luck wit your project, post sum pics wen u start.

[orangeute338]

I did some testing today

4th gear from 2000rpm

10psi just before 2500 and 15psi by 2700

do u have any specs on the turbos you put on?

I been reading up about the gt28rs(disco patoto) think 2 of them might be the go, dont give crazy all out power but are a very good mid range turbo make 220kw and over 300nm on a sr20

yeah will be changing the valve springs for sure and probably the exhaust valves to turbo spec ones, was thinkin the cams might even be better usualy n/a cams go ok on t conversions, want to make a torque monster rather then a dyno queen...keep stock rev limiter so want everything to be happening pretty quick, its a big motor I dont see the point running stupid massive turbos and reving to 7500-8k most of the time on the street rarely go over 5500 anyways...the vct timing is more for emissions isnt it? its not like vtec or anything where it actualy changes lift it more just retards and advances the cams doesnt it?

[xr6twin]

yeh it only retards or advances. but you really dont need more lift duration on a turbo engine any ways, just run bigger fuel injectors bigger fuel pump and the boost will shove it all in the cylinder for you lol.

yeh sounds like your idea is one to try. the twins on mine seem to make a hell of a lot of torque rather than kilowatts. but if your going for something that will pull like a mack truck the twins on a straight four is the way to go.

My house mate actually has a gt28/60rs on an sr20 in a 180sx and its making 223.7kw at the treads and 300bhp. it is an aboslute weapon! the tuner actually has the turbo maxed out at 19.5psi, only thing holding more power back is the size of the turbo.

Edited 27/06/10 11:04 AM by xr6twin

[scorcher]

keen to see what power people are getting out of their setups!!

I am still plugging away at mine nearly there though.

heres a couple of pictures for you guys

this is the kit that I have taken off to get ceramic coated