ok me and a friend are discussing this subject of twin turbos vs single turbos. my friend kinda has the idea of "1 is good, 2 would be awesome", while i think that people swap a twin turbo to a single turbo because 1 big turbo could flow better than 2 smaller ones.

discuss please

 

i would say it all depends on the engine(4cyl,6cyl,v or inline, etc) and the purpose of t (drag,autocross,street etc) they each have advantages and disadvantages.

 

To many variables..... "best" for what drag, road racing, pulling??? also what size motor, what kind of motor etc... Also, what set up on the "two" turbo's, are they sequential or are they one for the right bank and one for the left bank etc....

 

With a sequential setup you will obviously get boost at lower RPMS.. but with FDs most people upgrade to a single because the stock twins can only handle so much power. the disadvantage to going single is obviously turbo lag.

 

That made me laugh a lot, sorry.

 

This is assuming we're talking about the same cylinder bank (i.e. an inline engine), as V engines are sometimes easier to fit smaller twins in the engine bay than a larger single.

Most people go from two to one (Only really applies to Supras, FDs, and Skylines, which start as twins) because that's the easiest way to make more power. Obviously smaller turbos will limit power output. As for larger twins that would give similar output to a comparable single turbo, the twins have the advantage, however their complexity (mainly more parts and tuning two wastegates) and cost often outweighs the advantages for the average builder. 90% of the Supra owners I've seen that have gone with upgraded twins have done it for the bling factor, not the small performance gains to be had with twins.

 

2 are easier to fit under the hood in some cases and 2 create less turbo lag. thats it.

 

alright. yeah we were thinking about rx-7's, audi's, and supra's. i see the point now...

2 big turbos would be the best way to go, but very expensive
2 small turbos(stock)can only do so much power
1 big turbo is very good, but the lag would be horrible
1 small turbo would still have lag, and not so much power

so what about a twin turbo setup in which 1 turbo is small, like 1 ballbearing 16g size, and the other is a big turbo, like gt35r size? very quick spool up and low end power, and high power up top also?

what does sequential mean? and does "one on the left bank and one for the right bank" mean 1 turbo per two cylinders, on a 4 cylinder car? or would that be more for a V type engine, one on both headers?

and all of this was meant for a street car.

 

sequential is like supras and stuff where one is bigger then the other. one for low rpm and one for high.. "left bank and right bank" would be for a V engine where one side off one turbo and the other side off the other turbo. I dont think I have seen any twin turbo kits on a 4 banger, im sure someone has done its for sure not common.

 

PV=nRT

Thats all the duscussion there is. Any more is just preference.