hey guys just wanted to throw this up here and see if you guys had any ideas. so we took my friends mach 1 to eric @ brookspeed and the car would only make 6lbs of boost. my friend says the car was making 7-8lbs before we built the engine and lowered the compression and added some frpp shorty headers. the car had a 3.90" pulley originally and we went down to a 3.60" looking for 9-10 lbs of boost but we weren't even close. the car made peak boost at around 5500 rpms and after that it dropped of to around 5lbs and power dropped off as well. peak power was 395hp and 420 tq which i think is pretty good for the amount of boost it made but not where he wants the car to be, while there we checked that the bypass valve was shutting all the way once the car made boost and we checked all couplings and clamps. we also put a smoke machine on the car and could not find any leaks at all, we know the belt did slip some but were not sure how much it affected the boost level. we made 5 pulls with the car to 7k and every pull looked identical as far as the dyno curve and were within a few hp or each other . eric did a great job on the car and it runs great but we need to get the boost up to 10lbs for my friend. he is going to order a 15% overdrive balancer and were going to put a thump rr tensioner on it and see if that fixes the problem eric said we were probably just not spinning the blower hard enough, what do you guys think?
