pmuller9: I agree, the log is doing zip for scavenging. The long 2.5" pipe downstream is the real aid, not sure if a 2.5" pipe that is shorter (ie front mount) would have as good of velocity, may have to be tapered down to a smaller pipe. I would like your thoughts on header size and length, and feed tube size for a front mount deal with 100% isolation. Front 3 cylinders and back 3 cylinders with individual pipes feeding into a twin scroll turbine with single isolated wastegate. (divider up against the wastegate valve head)
The previous examples of the 363 sbf etc. were just to show that things that people say will not work, can and do work. Optimum? No way. I am content doing this "junkyard" style to see what works, and how things respond. I'm leaving at least 10hp on the table in trade for great spool right now and some hp in other areas. I'm hoping to take my junkyard dog to the track this spring and run 11's at 475+hp. Then get a little fancy after that.
deere114: I have wondered the same thing as dual 2" would be the next step up vs single 2.5". A single (probably shorter) 2.5" pipe is said to support 900-1000hp with a big turbo tho. I know of a 6.0 ls with a 2" crossover well north of 700hp. Small pipes big turbo.
With the 2100 stall Edge converter, 268 comp cam, half of the t72 exhaust scroll blocked with a plate,(3/4" hole drilled in the blocked side) I was able to get 10 psi of boost at 2100 rpm. Let off the transbrake and boy what a dog. Had to lay into it very slow to avoid backfires through the carb. As soon as the tach hit 2400, SEE YA! That's the rpm the H.D. log and a 2.5" x 13'+ pipe works on a 300. Any of the 3 cams I tried made no difference. Even tho I switched to the 3100 stall converter after the Crower, there is a rpm hesitation at 2400 rpm always. Perhaps the efi mani's or headers would provide the lower rpm scavenging to get over the hump...when exhaust pressure is much higher than the boost. The reason my system doesn't work below 2400 is because at the 10psi@2100 senario, the exhaust pressure was 24psi, and the boost 10 psi and no scavenging is happening...reversion. Above 2400, good to go. Maybe a single 2" or 2.25" feed pipe would work with the log and rear mount at a lower rpm.
FuzzySix: Ran 13psi non intercooled 14* total timing 87 octane dual port intake open spacer Holley 350 2 barrel ebay wastegate. Only abused, never cruised. He pinged it plenty shifting into 4th and boosting with big tires on it, that's why I developed the Cure to hold the power valve open during low cfm/rpm, high boost senarios. Beat the hell out of it tuning on my back road, then he beat up stock mustangs and camaros in town stop light to stop light (4wd). From there he tried to kill it just doing mud bogs (floating the valves for a rev limiter), and blew up a clutch and snapped axle shafts/joints. No injectors or anything fancy, stock mechanical fuel pump boost referenced. Had a broken piston skirt when I installed the turbo, and ran fine when he went 460.
sthorvictor: Glad to see your build coming along nicely. I have been laying low, just too much time on the puter being on 4 forums ect. I have being getting alot more things done vs talking about them lol. I will chime in from time to time, the next action will likely be on my youtube channel.