Why can't we turbocharge a 3s-ge?, Compression ratio related Options

[dudeofchaos]

I know that the 3s-ge engine has a higher compression ratio than the 3s-gte (which I guess means that the pistons' head are thiner right?), but what does it change so that we can't (or shall not) turbocharge the 3s-ge?
Is it because it would (I don't know) be too much compressed exhaust gases for the turbo to hold?

BTW: what does the last number in the compression ratio mean? (Like in 10:3:1)

This post has been edited by dudeofchaos: Jun 26, 2011 - 10:51 PM

[3WayStunna]

Its not necessary. Here in a few months ill have he blacktop, redtop, and 3sgte both torn down so i can do a install check myself and post the results.

[3WayStunna]

Alright ealier i posted that the blacktop might be able to fit through some sort of wizardry near the driver side engine mount. Well i think i found out the wizardry involved. Seems that what would most likly be required is a retro-fit of an st20** water pump, idler pulley, tensioner pully, tensioner, timing belt?? and of course the engine mount. Thats what i can gather to the least of things btw...ill put these tow pics here for comparison btwn the two. But it looks like the similarites speak for themselves. Also i hear that the blacktop uses a returnless fuel system AND
fly by wire throttle. The returnless system shouldnt be a problem for those who just continue to retrofit parts, but how would someone overcome the fly by wire throttle?

[Edophus]

3way here is a pic of the blacktop before i dropped it into my gen 5. All i've changed is the tensioner and idler pulley, didnt change the water/oilpumps or anything else as i used a redtop beams sump. You'll only need to swap the oil pump over if you use a different sump to the beams, as the beams oil pump has a recess for the crankshaft angle sensor so wont match up to the non beams sumps. Your still going to have the problem on a gen 6 that the exhaust vvti controller sticks out so far it will try and physically occupy the same space as the engine mount.



the blacktop beams does use a returnless fuel system, the ecu controls the pump, if you want to use the blacktop ecu then you will either need to retrofit the altezza pump in place of your own, or add a small tank with the altezza pump in it and a lift pump from your tank to the smaller tank, or simplest just alter the fuel rail to make it a return system and add an adjustable pressure regulator.

The altezza is drive by wire also. If your putting it in a celica and using a redtop inlet manifold then the throttle body wont match. I'm not going any further with my blacktop/redtop hybrid justnow as when i pick up that project again i will use aftermarket ecu, but if i was to continue where i left off i'd save myself a major headache and just drop the exhaust vvti controller for a fixed cam gear and run the whole thing on a stock redtop beams ecu as they are easy to work with, and its pretty easy to adapt the blacktop loom for it although you need different coilpacks. There really is nothing but pain in starting with a blacktop over a redtop!.