335i: fbo minus inlets on a e70 mix..Map7 which spiked to 21psi and was at 16.2 by 6000.

Nova: 5.3 swap, carb conversion( 650dp holley, edelbrock dual plane), headers, 243 heads ( milled for more compression), ls6 cam, 3.73 gears, 2800 stall, race gas and 150shot?( 63/73@6.5psi, but was down to 5psi psi on these runs) using a nos cheater plate 8 hole, bottle was at 1100psi.

First run i had 1st gear set to 15.9psi and as soon as it shifted to 2nd it spiked and boost fell off and come back on.

2nd run i limited boost to 12psi and had no issue.

Gonna go back to 2nd gear launches with full boost.

 

Good runs!

 

Thanks. There will be a tie breaker with me on full boost launching from 2nd gear. Should be 3+ cars next time.

 

Nice runs, modern turbo bmw technology has came along way. They have definitely earned some respect.
Are you having a problem regulating? Or is it just how it reacts turned up like that?

 

Nice runs......Love the digs.

 

It only has the issue when i launch in 1st gear and shift to 2nd. It spins 1st no matter what, so i pulled it down to 12psi to limit swheel spin and the boost spike. The jb4 helps likot it as well, but not enough.