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What are the differences between intercooled and nonintercooled 4BTs? I know the air intakes are different but what about pumps and injectors? What is involved in making an 4bt intercooled?

Thanks,

Bill
 

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Any turbo engine will benefit from intercooling (lower exhaust temps, slight efficiency gain etc).
No other modifications need to be made, but it does allow you to add more fuel for more power.
 

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What Dougal said, i.e. the hardware's all the same regardless.
 

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The difference in power has been reported to be about an additional 7 h.p. per psi of boost which seems high to me. It's hard to prove since dyno testing does not duplicate real cooling conditions experienced when running it done the road. My personal experience is that it was well worth the effort of adding it. I'm only guessing but it seems to add about 15-30 h.p. averaged over fully loaded and unloaded conditions.
 
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