drive pressure
 

Anyone wanna explain drive pressure to me? whats good, whats bad, and how do ya change it cuse im lost on the subject.

well a 1 to 1 is good if that helps

Are you talking about adjusting pressure in the drive housing?:humm:

for every psi of boost thnere should be an equal amount of cylinder pressure

i think he wants to know what drive pressure actually is. yes 1 to 1 is a good start, but it does no good if you dont know what one of the 1's even means. i think he wants someone to explain to what "what" drivepressure is, not what a correct ratio is

If you have 35 psi boost on the intake side and 35 psi drive pressure ( exhaust manifold pressure ) then thats good. Thats what they mean by 1 to 1 ratio. I bet my H1C with a 16 cm and a 60 mm GDS is not near 1 to 1. I am putting out 45 psi and I bet my drive pressure is much higher. A good turbo with a 4 inch outlet and a waste gate should be closer to the 1 to 1 ratio. There is much more involved that is way over my head, but, that is the basics as I understand them. So, in short, drive pressure is the PSI that is backed up in the exhaust manifold or pre turbo on the hot side.

It's not possible to have less than a 1:1 ratio is it?

so basically it is good to have as much coming in as going out? tAnd to much drive pressure would also result in i dunno maybe head gasket problems or valve float?

If that's all the cyl pressure you have you wont have a running truck.. :D

Quick explination...

Drive pressure should ideally be 1;1 when against boost pressure. Pretty much what you are measuring is the efficiency of your turbo. When your drive pressure go up way above 1:1 you are trying to push the turbo to hard and its out of its map. You pretty much have a backup of gasses that is hurting things like head gaskets and turbo parts.

so if you were to install a drive pressure gauge, where would you put it? one in the intake manifold for boost and one in the exhaust manifold for drive pressure?