Quote:
Originally Posted by dcb
Depending on the car, it may be somewhat trivial to change the gear ratio. It is about $20 and a trip to the u-pull-it for my saturn to get a taller 5th gear.
http://ecomodder.com/forum/showthrea...swap-2779.html
My rabbit was pretty easy too, but needed more careful adjustment than the saturn when reinstalling the 5th shift fork (still could do it in the car).
*maybe* you have a C transmission, and can get a .725 5th gear out of a corolla or a tercel or a yaris? It might take some research to be certain: Toyota C transmission - Wikipedia, the free encyclopedia
Taller drive tires are another option, which may or may not affect drag, as well as swapping in a used tranny with better ratios (and a new clutch disk and throwout bearing while you are there)
There is no inherent scope to modding 
P.S. if you need 50hp to cruise, you are driving a barn  |
Ok the 50hp was pulled from thin air, even the Taurus I first learned to drive in only required 13-15 hp at around 50 mph or was it 60 I forget, but someplace I have the dyno slip that stated this. Also the 50 hp was derived from a 50% load based on the wot peak hp of 105 bhp and 100lb/ft or was that the other way around, I need to see which gear ratios/gearbox is in the car, I know its a 5 speed, but the overdrive isn't tall enough, I can engage 5th gear as low as 30 mph and then get it down to 25 around slowing down for corners, but it also turns 3000 somewhere near 70mph per the speedometer and the gps (closer to 68 at 3000 exactly by the tach). I'd like either a taller 6th gear on top of the five now as a way of reducing the revs further, but unless it can be done reasonably by some one with some mechanical inclination but no prior experience and for not too much money vs saving and replacing it when it did wear out.
I'm being serious, it doesn't seem logical that the engine would spin any slower even if the load is reduced due to the aerodynamics being improved, vehicle speed is a function of available tractive effort power - road load power- mass effective*acceleration (ie the inertial forces) reducing the aerodynamic component is incorporated inside the road load force, as an example I studied in a hybrid and electric vehicle course we took a theoretical extended range electric conversion of a Ford Fusion Hybrid and the peak power usage was 40kw or about 53hp for both the city and highway epa cycles, however with the net energy usage much more severe in the city cycle without regen, which was cut in half theoretically with regen, however due to the way the highway cycle works there is virtually no gain to regenerative breaking in the epa highway cycle test