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MetroMPG · 12-29-2007, 10:56 PM

Good illustration, rwaffle. In fact, I'm pretty sure I'd read that tidbit (about the potential for diesels to benefit more from aero mods) and saw similar maps posted at TDIclub.

But I don't know turbos at all. What's the effect of taller gearing on turbo operation? If dremd's goal is to stay out of the boost, wouldn't reducing RPM through a gearing change raise engine load and cause the boost to come on sooner for a given road speed?

12-29-2007, 10:56 PM	#8 (permalink)
MetroMPG Batman Junior Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 22,459 Blackfly - '98 Geo Metro Team Metro Last 3: 70.09 mpg (US) MPGiata - '90 Mazda Miata 90 day: 55.97 mpg (US) Even Fancier Metro - '14 Mitsubishi Mirage top spec 90 day: 70.75 mpg (US) Appliance car - '14 Mitsubishi Mirage ES (base) 90 day: 67.41 mpg (US) Thanks: 3,997 Thanked 6,889 Times in 3,574 Posts	Good illustration, rwaffle. In fact, I'm pretty sure I'd read that tidbit (about the potential for diesels to benefit more from aero mods) and saw similar maps posted at TDIclub. But I don't know turbos at all. What's the effect of taller gearing on turbo operation? If dremd's goal is to stay out of the boost, wouldn't reducing RPM through a gearing change raise engine load and cause the boost to come on sooner for a given road speed? __________________ Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata Honda mods: Ecomodding my $800 Honda Fit 5-speed beater Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage. Ecodriving test: Manual vs. automatic transmission MPG showdown EcoModder has launched a forum for the efficient new Mitsubishi Mirage www.MetroMPG.com - fuel efficiency info for Geo Metro owners www.ForkenSwift.com - electric car conversion on a beer budget