hp per psi increase..
Sep 2, 2004, 05:07 PM
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hp per psi increase..
i know it's been discussed before but I can't find it anywhere in the search engine.anyways do any of you know how much hp or whp you gain with each psi that you increase your boost? my car was running at 17 psi and I increased it today with my mbc to 20.5 so I just wanted an idea of how much more hp I am running thanks.
Sep 2, 2004, 05:13 PM
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I would also like to know, i am in pretty much the same situation! Also what other mods to you have besides mbc?
Last edited by SurfguruJon311; Sep 2, 2004 at 05:18 PM.
Sep 2, 2004, 05:22 PM
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It depends on a few things like the engine's RPM and airflow at that RPM (volumetric efficiency) and also the turbo compressor efficiency at that engine RPM (less efficient = you are forcing hot, less dense air).
For example, all things equal, on a stock setup, going from 19psi to 21psi at 4000rpm will get you more torque than going from 17psi to 19psi at 7000rpm because the system is more efficient there.
For example, all things equal, on a stock setup, going from 19psi to 21psi at 4000rpm will get you more torque than going from 17psi to 19psi at 7000rpm because the system is more efficient there.
Sep 2, 2004, 05:22 PM
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i definitely felt a lot better on the highway today doin 90 or 100 felt stronger than normal..that was with 3psi raised from yesterday (17 psi to 20.5)..anyways it was nice maybe i can take my friends srt4 now who beat me by half a car length from 60 the other day lol..oh and the only other mod i have is the boost gauge and the forge recirculation valve..
Sep 2, 2004, 05:44 PM
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as far as i know he raised his boost 3 or 4 psi and an intake..said he dynod at like 245 whp so maybe one or two other things..(when i said friend i meant car buddy that i dont know well lol) but those things seem to get the jump on the roll a lot with the front wheel drive and being much lighter..same whp as me i was not complaining that he beat me..but this time he's mine 
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Sep 2, 2004, 07:19 PM
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Originally Posted by ez76
It depends on a few things like the engine's RPM and airflow at that RPM (volumetric efficiency) and also the turbo compressor efficiency at that engine RPM (less efficient = you are forcing hot, less dense air).
For example, all things equal, on a stock setup, going from 19psi to 21psi at 4000rpm will get you more torque than going from 17psi to 19psi at 7000rpm because the system is more efficient there.
For example, all things equal, on a stock setup, going from 19psi to 21psi at 4000rpm will get you more torque than going from 17psi to 19psi at 7000rpm because the system is more efficient there.
Sep 2, 2004, 07:21 PM
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oh well whatever it is..i'm happy to have my mbc installed and to not be running at 17 and 16 psi anymore..i dont know why i was running so low before but it's fixed now sooooooooo yay for my MBC lol oh and the hallman controlled from the cockpit is so much fun to just drive and adjust and see ur needle go up and down ...highly recommend it if u can get a used one..kind of pricey tho for new..thanx for the possible 7-15 hp increases per lb lol who knows how much now cuz everyone says something different but it's all good as long as i'm back to normal next step..ECU flash and turboback! 
next step..ECU flash and turboback!
Sep 2, 2004, 09:07 PM
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ok texas evo..thanks man..i wouldn't wanna blow up my engine 
lol good to know tho..i have the controller in the cockpit so i can do that pretty easily if i see tha tmy boost gauge is jumpin up to high..again thanks man appreciate the feedback..
lol good to know tho..i have the controller in the cockpit so i can do that pretty easily if i see tha tmy boost gauge is jumpin up to high..again thanks man appreciate the feedback..
