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#1
10-28-2005, 09:54 PM
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gear ratio question
I have the oportunity to purchase a 2.24 ratio rear end for my 300d turbo. I have always wanted to go to a lower ratio for highway driving but do you guys think the 2.24 would be going too far. This diff would only cost me $75 and there are only 2 bolts left holding it in. That appeals both to my lazy and my cheap nature. It is currently hanging from a 500 SEL of unknown mileage.
P.S. I did search this forum and could not anyone that has used the 2.24 so you don't think I'm that lazy! 
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#2
10-28-2005, 10:21 PM
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Rear differntial ratio will have an effect on your outcome.
Axle ratio (:1) 2.24 suited for a 400E, suggest big power output! An axle ratio of (:1) 3.27 from a 260E would represent a lower power output. Diesel plants in our 300 D and SDL, require 2.87, or 2.65 ratio, compaired to gassers higher ratio. Does this give you any more perspective?  I'm confused!
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#3
10-28-2005, 10:21 PM
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your mileage
should be fenominal (sp)? and your acceleration times from a stop. on the other hand once rolling it wont make much difference.
it might be a posi too. that would be a euro car, right? tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#4
10-28-2005, 10:23 PM
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Quote:
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#5
10-28-2005, 11:38 PM
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i dont
think the 2:24 was offered in us spec cars. and if so it may be a posi. no kidding.
tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#6
10-29-2005, 12:39 AM
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2.47
I have read so much about guys using the 2.47 ratio I wondered if anyone has used the 2.24. Every one that has tried the 2.47 loves it so I wondered if the 2.24 would be too high a gear ratio or just a little more of a good thing. According to (I think it was) brian carltons formula the 2.24 with 28" diameter tires would put my engine rpm at 2190 at 75 mph. I am impressed with the power of this car in all the conditions I have driven it at. My crazy wife has managed to get across the top of vail pass at 85 mph with 3 kids and all the crap that goes along with them so power does not seem to be a problem. And it gets 23 mpg city/ highway driving combo which seems pretty good considering the way she drives.
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#7
10-29-2005, 01:13 AM
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Everything I have read states that maximum fuel economy with a diesel occurs if the engine is operated at or just slightly below its torque peak when at cruising speed. I believe the 617 torque peak occurs at 2800-3000rpm. The factory 2.88 gears are almost perfect for 70-75mph cruising. This gearset with slightly taller tire to lower apparent gearing to @ 2:70 or so would probably be perfect. I think going to a 2:24 would lower the rpm so drastically that it would be hard for the engine to build enough rpm to start spooling the turbo up when you encounter a steep grade, like you do in CO. The 2:47 gears are probably a little too tall as well for mountain use but would likely work well in a places that are flat. Just my 2 cents. RT
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When all else fails, vote from the rooftops! 84' Mercedes Benz 300D Anthracite/black, 171K 03' Volkswagen Jetta TDI blue/black, 93K 93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K
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