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Location:
Ipswich
Registered:
July 2002
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Engine work for more power
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Mon, 29 July 2002 08:39
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Just curious as to how much effect normally asspriated mods have on a turbo engine.
That is : Port and polish?
Cam replacement?
What about bottom end work? What sorta mods work well?
Or should i just spend the money on bigger turbos and crank up the boost???
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Location:
Brisbane
Registered:
May 2002
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Re: Engine work for more power
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Mon, 29 July 2002 08:51
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Almost everything that works on an atmo engine will work on a turbo engine. An engine is simply an air pump; if you can get the air in and the exhaust out faster, it will make more power. It doesn't matter what pressure the inlet charge is at, it will respond just the same!
There are a few exceptions here though. You can't do any exhaust tuning tricks (eg tuned-length extractors) on a turbo engine, because the turbine in the exhaust screws that up. Also, using cams with heaps of overlap is not a good idea for forced-induction setups, as the inlet charge can get forced out the exhaust side during the overlap period (only a problem at low to medium rpm though).
Note that a turbo engine which is modified to breathe better will often see a reduction in boost pressure, in conjunction with more power! Remember, boost is simply a function of the air the engine can't consume...
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Location:
Sydney, OZ
Registered:
May 2002
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Re: Engine work for more power
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Mon, 29 July 2002 09:45
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You can't do any exhaust tuning tricks (eg tuned-length extractors) on a turbo engine
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Hate to say, Yes you can!! Just that Room be comes a problem.
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Engine work for more power
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Mon, 29 July 2002 10:10
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The best thing to do is just make sure all the runners on your manifold are the exact same length!
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Engine work for more power
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Mon, 29 July 2002 10:17
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Yeah, simple as that. Boost, really, is bad, as it is just excess air being compressed against your engine. The idea then is to get your engine to use more air, more efficiently, so that you can produce the most power with the least boost. The problem comes from overdoing it, so that your engine becomes a pig of a thing that really struggles to get onto boost, and then wants to rev past 12 grand once it finally hits. The idea then is to find a balance, and also use tricks like variable cam timing etc., however the simple rule is to build the best NA engine you can (except for the high comp and high overlap cams), then add the boost.
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