hey people, help as i am dumb
*(example)when running a boost setting around say 1bar or 14.5psi with a t25bb making 150kw.say if i put a bigger turbo on say gt30 running the same boost pressure would i make more power?or would it make the same power but have lag........
please help
cheers
More power. it'd have a lot of lag. You could run less boost and make the same power as your previous t25 set up.
so what makes the power go up???
i have always thought that 1 bar on small is equivalent to 1bar on the big turbo when talking about power
the cylinders are still getting the same forced air the only different will be spool up time.
isnt it
Torque is different and the bigger turbo doesn't have to work as hard to make 1 bar. Meaning it's not spinning as fast and it's creating less heat to be cooled. Someone else will have to explain how it exactly makes more power. But I know that a bigger turbo will make more power on same boost.
its all to do with efficiency
the bigger turbo makes the same power at lower boost because it is more efficient
all turbos add heat to the air it compresses
the bigger turbo spins less the make the same boost and therefore creates less heat
thats basically the gist of it
You would not make more power unless the smaller turbo's exhaust housing was restricting the engine.
1 bar pressure is 1 bar nomatter what turbo you are using. Since you are compressing the air to the same pressure, and you have the same manifold volume the temp will raise to the same level (Boils law) P1V1/T1=P2V2/T2
Sprinter Veteran
its "boyle's" law (which its not actually, boyle's law is pV = c)
edit to explain better: the law SprinterTRD refers to is Charles' law... typically charles' law is used when all three (Pressure, Volume and Temperature) are changing, ie a hot air baloon.. you change the temperature on one side of the equation, volume and pressure changes too. this equation can be applied to this situation, the volume and pressure arent changing, so the temperature doesn't either. so the turbo supplies the same power, but being more efficient, takes less power out of the car to spool in the first place. = slight power increase (doubt it would be much)
bahnugget is on the money.
Unless the smaller turbo is being pushed way out of its efficiency range (and is becoming a restriction) then moving to a bigger turbo at the same boost wont see any significant improvement. However boost will come on later due to the increased size.
Moral of the story, go for the smallest turbo that will achieve what you want.
Hen
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