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Old 09-12-2008, 02:11 PM   #10 (permalink)
TELVM
EcoModding Lurker
 
Join Date: Sep 2008
Location: Spain
Posts: 55

'El Misil' - '91 Opel Calibra 2.0i
Last 3: 29.02 mpg (US)
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Quote:
Originally Posted by ATaylorRacing View Post
On EVERY car I have owned.....if I was cruising, any air flow improvements into the motor made more FE and power....on MOST a better flowing exhaust did the same thing ...

What I have found is that with the extra power you can drive up to your speed easier and maintain it with less throttle = better FE.
Similar experiences here.

Switching to an oversized TB sometimes brings drivability problems for street & road, however. Unless the OEM TB is clearly undersize for the application (rare), the TB is one of the last things I'd fiddle with in the intake system.


BTW any TB has some potential for improvement. Every bit helps:




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