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Originally Posted by GTStang
This question is open to anyone but I figure are resident Turbo-lovers Boosted and Skyline will help me the most.
I think for my newest project motor I'm want to turbocharge it cause it is the one thing I have not played with yet. My first big question is like the title says what do you think of a single turbo vs. a TT set-up. I know with the new turbo's the turbo lag has been greatly reduced and cause of only having one it's a simpler install and usually cheaper. But for a serious Street set-up does the TT have any advanatges these days vs. the single turbo?
Next would be I have seen people do both for Turboed Ford's would be MAF or Speed Density set-up?
My idea at it's rough stage right now is 6-10psi air-cooled set-up(I want to keep the boost mundane) and I still want good low-end torque(I'm not saying turbo cars can't make torque). So maybe some quick set-up ideas you would do to meet these requirements if you have some would be appreciated.
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IMO a single is a more cost effective setup from 300-1250 horsepower, then after that I would think about twins. A single PT76-GTS will make 1000 RWHP, which is more than you ever need in a car, and has very little lag. Past 1000 RWHP it's kind of a gray zone, something like a PT91 is too big to be streetable (IMO) and something like a large frame T88 might not make as much power as you want. Twins are great because they are easy to adjust how much power you make and when they spool, because you can pick from .58, .70, .81, and .96 A/R exhaust housings for twins, whereas with a single T4 you're basically limited to a .81 or .96 otherwise it gets very restrictive.
You can run a MAF setup, which is very easy to do. Get a big MAF calibrated for some 55's, and a good tune and your car will run like butter. Speed density requires something aftermarket (speed pro, accel DFI, AEM, etc) and is generally more expensive and somewhat overkill for a typical street car.
What kind of a motor are you running, 5.0 or 4.6? For a nice mild street setup i'd go with a PT67-GTQ with a .81 or .91 housing, as big of exhaust/downpipe as possible, no smaller than a tial 38mm wastegate, a good bov and an intercooler.
When you're putting together any kind of an aftermarket turbo kit, you really dont have to worry about turbo lag. I'm running a T76-GTS with a .96 housing, 3.5" downpipe y-ing off to dual 3.5" dynomax race bullets, on a true 302" motor (4.00 x 3.00, with a 5.4" rod so it revs like hell) and it makes 17 pounds of boost by 3600 rpm's. Lots of fun on the street with a stick!