boost and horsepower

[vancem3m3]

how come some cars make like 300 whp on 20psi and some make 300 whp 10 psi? even with simalar builds?

[DeeAOne]

many variables. parts used(the quality of them), how it was tuned, the design of the motor, etc. im sure there is more....

[redrumracer]

size of turbo could be a huge factor as well. 10 psi isnt the same amount of air on a t25 and a t88

[EmminoDaGreat]

/\/\ correct sir..

[Vteckidd]

lots of factors, basically comes down to engine efficiency.

A motor is an air pump, how much air you cram into the motor directly relates to power out put.

A small turbo can only injest so much air, ad big turbo, more power.

but you have to have a proper flowing head, correctly sized cams, displacement etc.

a GSR with a t3/t4 turbo can make 300whp prob around 18psi give or take.

Ive seen GT35R GSRs make 320whp at 11psi.

Only difference is the first car is maxed out on power output and has a much more broad powerband.

The second car is capable of much higher HP due to its larger turbo, but its powerband is very laggy and peaky

[vancem3m3]

so would a gt35r be less strain on the engine? since lees boost?im just trying to see what i can learn before i retune.im going to sleeve but hear the turn around time is 3 months





lots of factors, basically comes down to engine efficiency.

A motor is an air pump, how much air you cram into the motor directly relates to power out put.

A small turbo can only injest so much air, ad big turbo, more power.

but you have to have a proper flowing head, correctly sized cams, displacement etc.

a GSR with a t3/t4 turbo can make 300whp prob around 18psi give or take.

Ive seen GT35R GSRs make 320whp at 11psi.

Only difference is the first car is maxed out on power output and has a much more broad powerband.

The second car is capable of much higher HP due to its larger turbo, but its powerband is very laggy and peaky

[4doortypels]

yea many variables...

valves
lift on the cams
timing
turbo size
manifolds flow and style
engine compression
intercooler sizing
ignition systems
port matching
engine management
do some research... bigger isnt always better... lower end power is fun too.

[umairejaz]

compression.

Edit: the guy above me said just that

[Terror]

displacement + compression ratio + CFM + psi = volumetric efficiency which determines for the most part how much power can and will be made.

[redrumracer]

so would a gt35r be less strain on the engine? since lees boost?im just trying to see what i can learn before i retune.im going to sleeve but hear the turn around time is 3 months
from what i have read and understand is dont look at it as a boost a reliability relationship, but more as a HP and reliability issue. the more hp the more stress. correct me if im wrong but thats what i somewhat understand it to be.

[grip_racer]

PSI is different from CFM.