Join Date: Mar 2009
chevy262 is offline
Re: 400 hp on stock 4.3 internals?
thanks for all the info guys, I'm not looking for 400rwhp. looking to get 400bhp out of this thing (maybe 360 whp) The fuel system I'm using is a 2 extra injector SDS unit, still shopping around for someone to weld the aluminum bungs. The cool thing about this truck ('06 silverado) is that the fuel pump is the same unit used on all fullsize chevy engines, even the big 6.0+ engines. I'm safe to about 600hp on stock fuel pump/returnless style system so thats not an issue, already called the manufacturer of the fuel pump.
And yall are right I've already spent about a full week or so over time tuning for the current setup I have now, and I haven't even gotten into tuning spark knock (there isn't any yet at 8-9lbs)
SCXtreme - The 8.6 I have now has already been built, the guy said it should take around 400hp to the wheels which is over the amount I'm looking for, it might need stronger axles when I get some sticky tires though. I cant do the marine intake because it's a returnless system, already been through that before. I'm guessing the plastic plenum will crack or break after 12-14 psi which is why its going to be limited around there. I also cant get any aftermarket ignition system, because no one sells aftermarket coils for this truck, it's a bitch. Already have ngk tr6 plugs with the correct gap. I'm probably going to end up going with true duals like you say, the stock system is really restrictive, it's just I'm in Houston and have lots of emissions testing so Im tryin to keep the exhaust near stock as long as possible
So If I can get 14lbs of intercooled boost showing up with correct tuning, maybe 35 wet shot progressive controlled (and retard timing for this also), that might get to the goal of around 360rwhp or about 400hp at the crank? After hearing everyones stories I think the less nitrous the better, but it's going to be so hard to get there without any nitrous.
Last edited by chevy262; 04-19-2010 at 10:29 PM.