NoviBlownGT
Boosted Crew
What cams? CR doesnt look to be the limiting factory as far as your power numbers. Something else is going on here. Also could be a super stingy dyno, seen it happen before.
What cams? CR doesnt look to be the limiting factory as far as your power numbers. Something else is going on here. Also could be a super stingy dyno, seen it happen before.
Maybe it's the Dyno?
Get a lull elsewhere before opening shit up?
i make 650 rwhp. .020 over 4.6, 10-1 compression, ported first design tvs 2300. DOB intake with the smallest upper pulley they make, 10% overdrive lower, 20lbs peak boost, stage 1 FRPP heads, detroit rocker cams, 72mm L&N throttle body, 123mm cai, 1 3/4 american racing long tubes. not sure what the timing is. but that's on pump gas.
numbers from a dynojet dyno.
i make 650 rwhp. .020 over 4.6, 10-1 compression, ported first design tvs 2300. DOB intake with the smallest upper pulley they make, 10% overdrive lower, 20lbs peak boost, stage 1 FRPP heads, detroit rocker cams, 72mm L&N throttle body, 123mm cai, 1 3/4 american racing long tubes. not sure what the timing is. but that's on pump gas. numbers from a dynojet dyno.
What was the deck height of the pistons? I'm thinking you have a lot lower compression than you think you do.
Two things would result in significantly lower than expected compression and both result in the pistons being deep in the hole. My guess is that either the compression height for the pistons is wrong or the wrong connecting rods were used.
FYI deck height should be about -.008" in the hole with a 4.6.
Sigh I really hope that this isn't the case but of course it could be. You'd think I'd be able to tell when the cars off boost like that it would really struggle to get up and move but maybe I can't tell?
Deck height.. no idea. Being that this was my first engine being built I didn't have the experience to make sure they documented all the critical dimensions to reference all of this. At the end of the day I probably won't know any of that until I pull a head off. Which is going to be a real bummer. Can't really hold anyone accountable a year and a half later, but I will definitely be calling MMR and raising hell if they sent the wrong everything.
Is there a sizeable difference in compression when the deck height is -.004 versus -.008? Using a calculator online that only netted a .09# change in compression.