jrobinson5093
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6.71 are the stock ratios.
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That should translate into a 37% increase in speed. So, 50mph x 1.37 = 68.5mph. Larger tires should then get me another 15%. 68.5mph x 1.15 = 78.8mph. This also means that I would be able to cruise around 65mph with the engine only hitting about 2,200 rpm.6.71 are the stock ratios.
Good thread. Seems like the opinion is that 4.90s would work in an A3 but that no one has tried it yet. Too bad as the acceleration on other driving characteristics are harder to quantify.
I am going to wait until mine is bobbed before I perform upgrades for top speed improvement. Only having to do two axles means that I am only out $2,400. I will provide my own labor. Not sure about the "get out of it's own way" comment but if you mean that it will have poor acceleration, I have several thoughts on that. Bobbed my truck should weight about 3,000+ lbs less so there will be considerably less mass to accelerate. Additionally, the Cat 3116 is capable of generating much more horsepower than the 175 it runs in the A3's, so the engine could be turned up if acceleration suffered too much.not to mention that it's $3600.00 plus labor - and that it probably won't get out of it's own way, especially if you've up-sized to 395's on your A3.
I like my A3, but again, increasing my cost basis on my deuce by over 4k is just![]()
turning up the fuel and reducing your curb weight by ~20% is going to help, as is losing the parasitic loss of turning the second rear axle. (That's simple physics)
I'd also look at manual locking hubs for the front.
Where would you put it?
They are the size of a transmission and are obsolete
Yeah, I understand that. To what degree the articulation would be limited is the question.putting that Mitchell in is going to limit the amount of articulation of the rear suspension due to driveshaft angle limitations.
m-35tom,That should translate into a 37% increase in speed. So, 50mph x 1.37 = 68.5mph. Larger tires should then get me another 15%. 68.5mph x 1.15 = 78.8mph. This also means that I would be able to cruise around 65mph with the engine only hitting about 2,200 rpm.
I wonder how bad the acceleration would suffer though.
Yeah, BUT, I am not turning 2,200 rpm. The cat will do 2,700 all day every day.Circumference = Diameter x PIE (YUM) PIE is actually a funny looking character but I like PIE! Yes I do!!!!!
14.5 x 20 Michelin is 42ish inches in diameter ( I didn't measure one )
PIE = 3.14...... (3.14 for this discussion)
So:
Michelin tire goes 11 feet/rev
11ft x 2200rev x 60minute x 1(gear ratio) x 1 mile
rev.....minute..... 1 hour........4.90............. 5280 ft
a stock 14.5 x20 michelin with a 4.90 gearset at 2200 engine rpms is going about 56 mph
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