Diff ratios
Submitted: Monday, Aug 12, 2002 at 00:00
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Boris
I have a 2.5lt T/D Mitsubishi Delica (import), which basically runs Triton/Pajero running gear. The vehicle is quite good in most areas, and pretty much does the job that we ask of it. However at highway speeds the engine is turing over quite quickly, 100klm/h equates to 3000rpm. Should I be playing with diff ratios, and or wheel/tyre sizes, to improve highway travelling?
Reply By: Derek - Tuesday, Aug 13, 2002 at 00:00
Tuesday, Aug 13, 2002 at 00:00
Hi Boris. I had a Mitsubishi L300 van and although not real flash off road was one of the most versatile 4x4s I ever owned. I raised the
suspension and fitted 10R 15 tyres which improved its off road ability considerably but killed the acceleration and reduced the cars braking ability. I solved the acceleration problem by working the motor a little, but there was nothing I could do for the brakes. 3000rpm sound fine as this is what most 4x4 four cylinder engines pull for 100kph. Be warned. If you raise the front end too much by screwing up the torsion bars, you run the risk of popping a front axle out of the diff centre. Good luck, they're a great car.
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Follow Up By: Urro - Wednesday, Sep 25, 2002 at 00:00
Wednesday, Sep 25, 2002 at 00:00
Hi Boris
I can only confirm what Derek is saying.
Beeing a member of an European
forum specializing in Mitsubishi 4x4's + Hyundai Galopper we've discussed this topic of the hight rpm's at already 100km/h, over and over - the L300 is just no racing engine.
... but a perfect car to rediscover the advantages of beeing slow.
Some of our members experienced the same issues with enginepower, but -even more important- breaking issues.
Due to the fact that there is not too much space (in width) in the front roadhousing some L300 owners are thinking about fitting 235/85 R16 wheels instead of the original R15's - however the extra weight of the wheels is substantial + therefore leading in breaking problems.
The L300/Delica has the same engines/gearboxes/axels as some Pajeros + can therefore be exchanged - however you would have to make sure all parts have the same transmition ratio (there are at least 4 different variations).
cheers from Switzerland
urro
who has been in the Sahara with his L300 :-))
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