Dyno questions

[vince87t]

I had my mostly stock 12 sec recipe car dynoed today and it would not exceed 15 PSI Boost. I drove it home and walla... 19 lbs was there. Any ideas why? The numbers were as follows: 1st run 298 HP and 398 lb/ft, 2nd run 302 HP and 399 lb/ft at the wheels (at 15 PSI). The dyno guy said it might be that not enough "load" was on the motor to produce peak boost. I stuck around and checked out a 540 HP and 700 lb/ft twin turbo LS1 run at the exact boost it was set at (8 PSI). Any ideas? Thanks, Vince

 

[UNGN]

Your chip may allow higher than 15 psi in first or second but not in 3rd. What do you use for boost control and what chip are you using?