I just made 1115 hp/1037 ft lbs of tq blowing thru a modified 502 mpi top end with a m3sc procharger on my 540 on Tyler Crocketts dyno,Smitty

Holy cow Smitty thats awesome! How much boost were you ruinning? I have been running 30 deg of timing . what were you running? did you try any other timing settings in the interest of power?

it was at 33 degrees under boost,my motor is 8.22-1 and has aluminum heads plus ceramic coating on top of the pistons. we didn't try any more timing but I can set my base timing up from 8 to 10 degrees to get more overall. We really should have bumped the base up to 10 for one last pull just to make some crazy numbers but I didn't think of it at that point. The 1115 was at 13 psi of boost,the 1057 was at 11-11.5,the 1037 was at 10 psi,Smitty

Sounds like a lot of timing.
What fuel are you using?

93 octane on the 1037/1057 hp pulls,20% 110 mixed with 80% 93 for safety margin on the 1115hp pull.The motor is 8.22-1 and has ceramic thermal barrier coated pistons/aluminum heads so it can take more boost on the same octane compared to the typical stock piston 8.75-1 blower motor,Smitty

Smitty, what were the cam specs on that motor?
Please see my post here regarding cam selection. Thanks, Greg

Greg ,it is a hydraulic roller in the 240 at .050 range with .650 lift on a 114 icl,for exact specs you would have to talk to bob madera/rm builder 585-654-8583. It was a custom cam/valve spring package he profiled to my exact application. You might want to think about having him spec out your cam as he is very good at using all the application specific information you can provide to have a cam ground that is going to come as close to possible at meeting your goals,Smitty

Hey smitty, Hows it runnin? Good I hope. I have a question for ya. I have been logging with an LM1 and I get a lot of lean spikes on the graph. I mean a lot. someone said those are misses showing up as oxygen and therefore lean. I get them at all speeds. It makes it kinda hard to read the true mixture. I am wondering about my plug gap. I have an MSD and the plugs are set at .035. NGK -7 plugs new wires cap and rotor as well. I cant hear a miss, The boat ran 92 with 3 people and gas and cooler saturday. Would a bigger gap maybe help? I read an article in HOtboat this weekend about a blown sanger or something they took out of storage after 17 years cleaned it up and set the plugs at 045 and ran it? I was initally thinking 030. Any thoughts from you or others would be good! Thanks greg

Smitty, If you were to build it again from scratch would you do anything different? Different componets? Anything? Up the compression? Intake?

So far I'm pretty happy with the overall package,using a mpi intake is a losing battle though,I'm sure if you were looking for all out hp you could do better with a conventional intake and throttle bodie. I have always used the -20 cc blower pistons which yield around 8.25-1 compression,I'm sure I could make more base power but I like being able to run the extra 1 or 2 lbs more boost on the same 93 octane gas. I don't have any on the water time yet with this package so I can't really give a true answer but I was pretty happy overall 2 years ago with the 944 hp set-up I had built,its biggest problem was the few times I had crappy comp cams rocker nuts split and back off causing valvetrain problems. When I switched to arp nuts I never had another problem with valve train again,I didn't even have the valve covers back off for the second half of the first year or at all last year. To ensure I would have no more problems I switched to T&D shaft rockers,they were a PIA to setup but they seem like they will be real durable,Smitty