How do you measure this and what are good numbers? Thanx,

Paul

 

Use your EGT port and use some copper tubing and a boost gauge. With a 62/12 I imagine your drive pressures won't be too bad. when you start getting 55-65 psi, thats when I think it's getting a little high.

 

Yup, drive pressure is the exhaust pressure that builds up in the exhaust manifold. You don't want to see over 1:1 between boost and drive pressure. For example, if it takes 20psi of drive pressure to make 15psi of intake manifold boost, well, that's bad!

 

Is your turbo 71 series ss 62/12 or just the regular htb2. If it is the 71 series the drive presser is .8 to 1 at 55psi. I think the htb2 62/12 is 1 to 1 at 50psi