Hey, sorry guys I tried searching and could not find anything on this. How much does PSI effect WHP. Will there be a relatively large difference in whp between setting a boost controller for 20psi over 23psi? I'm trying to figure out if there is a certain equation for this or is there just to many variables to make an accurate prediction. Also I bought a Tru Boost today and would like to set it at 23psi. Will this be safe on stock internals with no arp head studs?

 

Boost pressure does equate to power based SOLELY on the idea that its forcing more compressed air at 23psi over 20psi. Now you can run 20psi and run say, 18degrees of timing at the top of the map and be faster than running 23psi and running 14degrees of timing its relavent on things such as ambient temps, timing figures, motor VE, etc. If you're only looking at "figures" on paper 1psi = ~7hp perfectly tuned is the common consensus. You can run ~25psi on stock headstuds on a IX; they are more of an "insurance" than anything, (when relating to <25psi).

 

Thanks, is 23psi a good number to go by or would you bump it up to 25

 

Start at 22psi and log. You CAN boost 25psi on 93octane pump gas, but you have to properly tune for that -you can't just set the boost and think its okay.

 

i had a custom flash by ams that is ready for turboback, boost controller, intake, all the way until I get cams

 

I'm in arizona though so i only have 91

 

PM me.

 

Relative to the setup as the VE will change with boost pressure based laregly on the size of the turbo.

A GT42 setup seems to pick up about 20 HP per PSI from about 10 PSI to 30 PSI then the gains will start tapering off above 30 PSI.

A Stock turbo might pick up 15 hp per PSI from like 10 PSI to 15 PSI, then the gains per PSI start to drop off quickly.

 

Boost pressure tells us one thing - how much pressure is in the intake manifold.

It doesn't tell us anything about the volume of the air being used per unit of time, or the temperature. It doesn't tell us anything about engine efficiency, and it definitely doesn't tell us about the pressure and temperature inside the exhaust manifold, which is pushing back against the intake charge (something most people don't consider). And lastly, it doesn't tell us anything about the tuning.

For these reasons, it's better and more realistic just to find others with similar setups and get an idea of what does what in the real world.

 

thanks for the replies