Twin Turbo?

[Redwarf]

Nissan's March used a twin charge setup

 

 

Many years ago I got flogged from one end of Deniliquin Autocross to the other by one of those puppies. Worked REALLY well on the little 700cc ish donk. Very impressive.

 

Now back to regular viewing. ;)

[iwontarolla]

No ones really explained twin charged yet so what is it? How does it work what are the beneiftes? Sorry for asking questions when you guys are discusing but only way to learn aye? Thanks guys

[Toy-Yoda[RL]]

Tried google? :dance:

[iwontarolla]

Yes I have I've been googling for the past like 3 hours I havnt found much on how it works or what's involded in it and if I did it didn't make much sence like does the supercharger blow in to the turbo or the other way round or what?

[Jason]

took all of 5 seconds http://www.alfabb.com/bb/forums/attachment...157_35_full.jpg

 

Also I think it would be nice to put a 'real' intercooler and aftercooler for maxxxium performance. Or maybe water injection just at supercharger outlet, although there is a possiblity of blade errioision from impingment if the water dosnt fully evaporate. Twin charger setups make me feel funny inside :dance:

 

ffs now you have me thinking about twin charging my mr2...

Edited April 21, 2010 by Jason

[Jason]

FFS

 

Ok, so say for a 4age, use the small sc12 running regular boost even under drive it to be able to keep the high rev ablity of the 4age. Then useing a small turbo, lets say 5-8psi max. Supercharger feeds turbo, also have a large 'check valve' between the charger and turbo to allow the turbo to flow more than the charger.

 

The check valve just taps into the piping between the charger and turbo, letting non-pre charged air in but locks off in lower boost cases.

Edited April 21, 2010 by Jason

[Taz_Rx]

Hmm that was really hard too.......

 

http://www.rollaclub.com/board/index.php?a...%2Btwincharging

 

I want my 5 seconds back. :dance:

Edited April 22, 2010 by Taz_Rx

[iwontarolla]

after this theard it got me really intrested in this it seems like its the best way to go but does the advacenedness of it make it worht it?

[ke70dave]

after this theard it got me really intrested in this it seems like its the best way to go but does the advacenedness of it make it worht it?

 

c'mon dude throw some commas in your posts!!!!!

 

took me 4 reads of your post to work out what you were trying to say...

 

anyway,

 

i recall reading a huge thread on toymods a while ago, basiclaly said the only reason one should try and twin charge an an engine was for the academic excercise, the "because i can" excuse.

 

which to me is a perfectly good excuse to use to attempt to twin charge an engine.

 

with this kind of thing you really are trying to re-invent the wheel, theres prolly a reason that there is hardly any standard engines that do it. but thats no reason for it not to work, its just not viable for mass production.

 

i always wondered about a proper by-pass valve in a (super/turbo setup). something designed from scrath, that would be awesome for a 1-off design, but no good for mass production. surely there is a way of making said valve work well.

 

and as for using twin turbo chargers, there has been no discussion of different rear housings/rear wheels/front housings/front wheels. there is so much to a turbo than just "t28 bb's"!

 

to be honest i don't know much about it,mainly because ive had no reason to look into it..

 

for instance say you used 2 small turbos on a 4age (2 cylinders per turbo), you could use a really tiny rear housing, and a larger wheel wheel, and then a smaller front housing and a bigger wheel, i mean could that work? ive no idea, but its another idea.

 

amazing the rotor heads get right into modifying turbos, but you don't see it much in piston engine enthusiastis. well not that ive seen anyway.

[Taz_Rx]

Dave google "volkswagon TSi engine". :wink: Mass produced twin charged motor...... although this thread is about twin turbos.

 

The reason why there isn't heaps of twin turbo engines out there is cause you can get better all round performance with one. How many RB26, JZ's or 13bt's do you see that have had single conversions! :laff:

[chappo12]

you can't have turbo thread with out rotarys

 

thanks taz

 

i love rotarys

 

 

brap brap brap

Edited June 30, 2010 by chappo12

[ke70dave]

Dave google "volkswagon TSi engine". :wink: Mass produced twin charged motor...... although this thread is about twin turbos.

 

The reason why there isn't heaps of twin turbo engines out there is cause you can get better all round performance with one. How many RB26, JZ's or 13bt's do you see that have had single conversions! :laff:

 

hmm thats a very interesting engine that VW have!

 

though these guys running single turbos, are they going after large horsepower? or power everywhere?

 

if a race car spends 90% of its time in the top 40% of the rev range, then a single turbo may be the way to go.

 

though a street car you might want power everywhere and a nice steady power/torque curve?

 

my mate used to have a stocko r32 gtr, and it was making ~8psi of boost from 2500rpm all the way to 9000rpm. i dare say this can only be achieved with the twin smaller turbos? what you think?

 

interesting with the GTR it didnt really have the "turbo kick" when the boost came on, it was so nice and smooth all the way up the revs.

 

though it seems that if you go chasing higher power figures then single turbo may be the way to go. depends what you want i guess.

 

I'm not arguing for or against, just merely explaining my experiences!

[Hiro Protagonist]

hmm thats a very interesting engine that VW have!

 

though these guys running single turbos, are they going after large horsepower? or power everywhere?

 

if a race car spends 90% of its time in the top 40% of the rev range, then a single turbo may be the way to go.

 

though a street car you might want power everywhere and a nice steady power/torque curve?

 

my mate used to have a stocko r32 gtr, and it was making ~8psi of boost from 2500rpm all the way to 9000rpm. i dare say this can only be achieved with the twin smaller turbos? what you think?

 

interesting with the GTR it didnt really have the "turbo kick" when the boost came on, it was so nice and smooth all the way up the revs.

 

though it seems that if you go chasing higher power figures then single turbo may be the way to go. depends what you want i guess.

 

I'm not arguing for or against, just merely explaining my experiences!

 

Toyota themselves replaced the twin-turbo system in the 1JZ with a single at the second update, so they obviously saw that there was a reason to change. Combined with VVTi they had more torque in the low-range (max power was unchanged but remember the 206kw "agreement" so there's a good chance it went up too). Single VVTi 1JZs are noticeably faster than the twins too.

[ke70dave]

what would be interesting to see though is the single turbo 1jz without the VVTi vs the dual turbo 1jz.

 

these guys sorta did it.

 

http://www.turbomagazine.com/tech/0103tur_...upra/index.html

 

pretty interesting results.

[iwontarolla]

It reallyjust comes down to what you want to do, there's reasons for twin turbo and for single. But maybe the single turbo is just the way to go it's simple and produces good power and if set up right not much lag