Quote:
Originally Posted by GOFAST
why does the pre turbo come in later ?
I also inject pre turbo and I want to learn as much about it as I can ?
how do you determine when to inject pre turbo and when to inject post I.C ?
gr maurice
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Hi maurice
During the time reading on pre-turbo injection, many state to inject as late as possible due to the fact that injecting at "low boost" would eventually result in a possible damage to the compressor blades.
Also you have to understand why are you injecting pre-turbo eventually?
To increase compressor efficiency.
Mainly compressor efficiency is lost on high boost due to the compressor efficiency map and due to heat generated by high boost.
So when would one inject pre-turbo?
One should set pre-turbo to start just before the compressor start to loose it's boost efficiency.
Example : I own a Garret Gt2560r turbo. Comparing this turbo to my engine airflow, it start to loose efficiency past 14psi. Infact between 1 to 12psi the amount of heat generated is low while past 14psi till 20psi it almost doubles.
So in this case injecting @ 12psi progressively increasing till max boost
Check out the attached compressor map