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Old 03-15-2012, 07:02 AM   #28
scrming
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Drives: 12 Second Brick
Join Date: Jun 2009
Location: at my pulpit
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Quote:
Originally Posted by JamesNoBrakes View Post
Yep, I agree that this acticle/text is pretty slanted. Maybe it's from the 1970s too

Kind of, but not really. Lag is not really much of an issue anymore, with twin-scroll turbos, variable vanes, big displacement engines with two smaller turbos (rather than one) and the acceleration/spool up is so fast as to be instantaneous. As a comparission, my SS takes a LOT longer to make decent power and it's "sweet spot" is up very high, but a turbo can hit a lot of torque early. I'd again go to "cost" for the real reason, more expensive to design the turbo, protect it from heat, make sure all the components interact properly, etc.
It's not just more economical in terms of gas, it will make more power at the same boost levels (internal pressures in the engine), that's a benefit of the efficiency.This isn't quite true, that supercharger STILL heats air and puts it into the engine, maybe not as bad as a turbo without an intercooler, but it's also not good for the engine and not near normall-aspirated temps(when air is actually being compressed). I've dealt with a few turbo engines without intercoolers, OMG those things get hot, but still, SC without is also hot. There's also the issue of downstream, the more the turbo is working, the cooler the exhaust is going to the other parts like cats and so on, the intercooler will have a higher chance of melting the cats at the same WHP.

Um, not really, BOV valves and proper tuning/installation mean this isn't an issue. This seems like hyperbole from someone with a poorly tuned blown civic or something.

Hmm, I'd assume this is more of a wash if even true, the turbine is harnessing hot exhaust gases, that means you are getting something (compression of air). Hot air comming out the exhaust manifold of the SC engine is not going to cool as it passes a turbine, nor is it going to benefit you in any way once it's left the cylinders.

Hmm, it's maybe a different kind of noise, many turbo systems incorperate "silencers" in the induction to mask the noise, with it removed it's definitely more noisy, then there's the blow-offs and everything. I'd say a little quieter, but when we're really comparing to compressors that can build up to the same boost (usually this is not the case because the SC needs MORE boost to make the same power) they can both be pretty loud.

Kind of, but it's like the top issue: These have been designed arond in most cars, with coolant systems that continue to circulate after shutdown. This is a very strange paragraph anyways, because its not comparing apples to apples, it sounds like comparing a OEM SC to an aftermarket TC, and even if not, it's not like you bolt on the SC and drive away, there's more involved in the install.
Agree
Not only that, but at the same PSI, you're getting significantly more power output from your engine with a turbo!
I've never agreed with this in the contex of "harder to tune", but this IS the reason they are a bit more expensive. You have to have all the required supporting components (just as you have to for a SC, in fact some of the same components are usually necessary, like intercooler, bigger injectors, higher pressure fuel pump, etc). This gives a tuner what they need to be able to make the system work, and if it's an OEM system, this stuff is usually figured out easily at the factory and designed with safety margins for every possible situation that could be encountered. The reason I disagree with it is that I DID turbo-tuning and I ran just fine with my modificaitons, but I knew my limits.

The end reason is most likely cost and simplicity (which is also cost essentially).
Great commentary! And I completely agree with it! Only thing I would add is when it comes to appearance, nothing looks as cool as a nice roots or twin screw sitting on top of the motor!! On the Flex, my turbos are tucked underneath everything and are impossible to see! LOL!

BTW, here is my dyno sheet... Blue is stock tune, Red is with the Livernois Stage 4+ tune... Figure at 2500 RPM i'm making close to 450 ft/lbs at the crank...

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