Ok, I should be going to bed, but since my toes are frozen, I guess I'll try to clarify some things...
1.Yes at 18psi on a 2.3 liter , it cant cut the mustard, but on a 2.5liter with 93%volumetric efficeicny at 10(ahem let me say that again) 10psi, The flow numbers for the Super 60 would be fine. Remember like you said earlier, this needs to be a bolt on. and a bolt on for our cars will probably only run 7-10 psi(intercooled). You wnat much more than that, and well... its not really a bolt on, but a bunch of bolt-ins.. and blow-offs...
As far as the redline issue, That would be a personal choice but, I for one wouldnt want to see what this engine could do at redline in 5th gear under 10psi of boost(no matter what the compression ratio)...As for the earlier gears.. well the optimal shifting point is based on the MAx Torque point, not the Redline.. so I would venture to say You might not have to shift at REDLINE to get the best run in your car...(remember RPMs on a Turbo after the gear change are very important due to Volumetric change in the engines requirements.. )
2.Yes,Boost lag is affected by compressor size. but not so much as the Exhaust Turbine is. Thats why the VVNT's have adjsutable vanes in the Turbine side, and dont have a james bond(round eye door thingy, turn and shoot!!) opening leading to the Inducer of the Compressor wheel.. even though that would look really cool...The lag on the kind of turbo's we are talking about, well the kind I am talking about would not be relaly noticable. But you add in a LARGE Compressor and the VVNT I think you can get away with it. The problem I dont think you realize is that the SHAFT diameters on a T28(essentially a super60 wheel) are different than the shaft diameters on a T3/T03/T04 family of turbo. Hence if you want to use the only VNT turbo out there that I can think of(the VNT25 by Garrett) you are limited to the largest Compressor wheel you can find to fit on the shaft diameter(remember Funny turbine side wheel cant be changed to another one.. it will come into contact with the vanes on the VNT...)happens to be the T28/Super60..IF they can make a T04B s2/s3 to fit... then damn.. go for it, its a GREAT design...
3.LOL.. actually the 12A at 30 psi would be a big stress on the motor as the impellars fly apart because you are asking them to spin at like 300,000RPMS...LOL
4.As far as the cam issue.. NO you would not need more overlap to compensate.. CAMS seem to be a mystery to most. But on a Turbo engine, you dont want overlap, well not alot at least, The problem is with large overlap and HIGHER boost, you are basically blowing out the exhaust tract all the goodies you are forcing into the chamber(ie more air, more fuel...) and the more you pressurize this the more you will blow out(think shaking a coke bottle, open it then close it again real quick.. if you leave it open longer, you loose ALOT more stuff. )The trick to Turbo cams is Duration and Lift. You want as wide and as flat a lobe as you can get, and thus allowing your valves to stay open longer(duration)..you can adjust this when making the cam(because you can degree the Intake lobes and exhaust lobes to give you the required seperation). You also want the cam to pus the valves open more, thus you dont get as much valve shrouding in the combustion chamber thus making the flow of gases in and out easier. NOW there is a fine line there, TOO much duration and you WILL get overlap, more than you want.. and Lift is also garnered by piston to valve clearence. But thats not all. the SHAPE of the lobe affects how the cam follower can work.. too wide a lobe and you will get a sticking point(think roller rockers and Cams)....I can go on, if youd like to PM me...
5.Damn my head hurts , I shore could use some of that squeeze bang and blow.. no wait... my GF would kill me...
5a.
I don't get the part about you saying it's "understandable on a large turbo running at high boost, but try running a large turbo on an engine that cant handle it" when you stated earlier that a larger compressor would spool up later (3500-4000rpm)
the IT i meant was the Turbo. You mentioned this when you talked about using your 20G on your StarQuest...You said it held its boost all the way till redline... I said of course it would when you run it at high boost. Thats what that turbo is deisnged to do, flow a certain larg CFM (which it can only do at large amounts of pressure). Now ifyou took that Turbo and put it on a 1.6 liter Mazda engine, then run it at 8psi.. what do you think would happen? thats what i meant(im exagerating here.. jsut cause I like to hear myself type.. it keep s me awake after a 12 hour shift, so i can still make it to school in 2 hours..)
okies. off i go..
