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Originally Posted by WB9MCW
WE ALWAYS GET THIS SAME ? FROM THOSE WHO WANT MORE SO HERE IS A COMPILATION OF THE VARIOUS COMMENTS AND ?'S ON IT!
BETTER OFF TO SC (CENTRIF TYPE NO HOOD NEEDED AND COMPRESSION IS NOT A PROBLEM IF YOU KEEP THE BOOST LOW @ <5 PSI) AN LS1 C5 VETTE IS WHAT MOST END UP DOING.
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Boost is boost regardless of where it comes from, turbo or supercharging. Depending on the engine design, especially head bolt configuration, you may be able to safely run up to 8 psi without internal modification. Unfortunately, the LT5 is not one of those, primarily due to only 4 head bolts per cyl design as compared to other closed deck Chevy engines with 5 bolts/cyl. 5psi boost is about all you can safely run on an LT5.
There are no free rides, but some are cheaper than others.
Supecharging is a parisitic drag on crank horsepower. The power to turn the blower/supercharger/puffer comes directly from the crank. For descriptive and ease of demo purposes only, assume an engine has 400 crank Hp, in normally aspirated configuration. Install a supercharger which requires 50Hp to operate @ 6 psi boost, yielding a Hp increase of 50%, expressed as follows;(400Hp-50Hp)*150% = 525Hp
A turbo derives its power from exhaust gasses. Turbos do not create drag but do reduce engine horsepower in a much reduced way by inducing back pressure on the exhaust, thereby lessening cylinder evacuation efficiency. Once again, numbers are for demo purposes only, but are somewhat relative to supercharging. Install a turbocharger which reduces engine efficiency by 5% (20Hp), operating @ 6 psi boost, yielding a Hp increase of 50% (boost is boost) expressed as follows; (400Hp-20Hp)*150% = 570Hp.
If turbos are better, as in more efficient, why do more folks go with superchargers. Answer, until now, is less cost & simpler installation.
UNTIL NOW: Ron Hanselman & I have formed a new company called Raptor, LLC for the express purpose of developing rear-mounted turbo systems for the C-4 Corvettes, LT5, LT4, LT-1 & L98. Only the Lt5 will be a twin turbo configuration. The others will be single turbo design.
Rear mount systems are much less expensive and much less difficult to install. Our system will be sold in kit form, with everything you need to install it, much like a cat-back exhaust system. There will be optional components. We have a 90 ZR-1 and a 95 LT-1 nearing completion now and our plans are to have them both at Bowling Green for the Gathering.
You may have seen STS Turbos (Squires Turbo Systems) shows on the SPEED channel about the C5 systems. Raptor has an exclusive agreement with them and will be featured on STS's website once our systems are ready for sale.
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NOW U CAN TURBO AN LT-5 BUT AGAIN BIG $$$
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NOT BIG $$$$ ANY MORE! See above.