BklynRX7

HEY guys i was just wondering if there any real math to the hp extimations people make on here. For example if a stock tII makes 210hp at 7.5 psi then how much would it make at 10 psi ect. So is there a way to figure it out or do you guys just compare setups to setups youve seen dyno those numbers before?

Same deal for compression... I am just curious as to what id be able to make on my turbo-n/a project in progress but dont wanna bog the forum with stupid estimate requests.

jono20

exactly. I dont think theres any math. just a dyno and rough estimations

edmcguirk

You can do rough estimates by using math but I think most of the people here are going by past results.

For example a rough calculation for old boost / new boost to old HP / new HP is:

old HP*(((new boost+14.7)/14.7)/(old boost+14.7)/14.7))=new HP

210*(((10+14.7)/14.7)/((7.5+14.7)/14.7))=234 HP (very roughly)

There are other calculations for other types of changes and there are even a few web pages out there that will let you set your own parameters for an engine and then calculate the output HP.

Math really does work but it can't take into account the things that you don't know how to measure. (If you really know how to measure all the important parameters, you can probably use math very accurately)

ed