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September 11, 2003
You can anticipate the changes by working it out in terms of percentages.
Changing a 4.22 diff with a 3.9 diff is about a16% change. Revs in any
gear for a particular road speed will reduce by 16%. Or road speed will
increase by 16% for the same revs. In theory (but not in practice)
acceleration will be worse by 16% which sounds a lot but is barely
noticable.
That said, acceleration changes are not quite so straightforward as it
depends on how well the gearing is matched to your particular engine torque
and power characteristics. And these depend on all sorts of engine
variables.
Given the standard gearing, unless you are totally hooked on traffic-light
dragstrips, or are racing in sprint events with a high-reving engine, then
the time spent in the low ratios when pulling away will be so negligable as
to be ignored. A 3.9, or 3.7 diff on a 1275 will be nothing but a Good
Thing!
Guy
"Guy Weller" < Guy.Weller@... > 25159
Posted on September 11, 2003 07:03 AM
Posted to category(s) Drive Train | Engine (external) | Engine (internal) | Exterior | Miscellaneous | Racing | Restoration | Transmission | Tuning
