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R30 diff

machg
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machg Enthusiast

machg

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Posted

Guys,

Doing a lot of K's in my HR30 now. It would be nice to have a taller diff. What is the tallest diff I can get for my car? It currently runs the L20ET auto diff with L24E manual box (120km/h = 4000rpm) so how much difference would the "tall" diff make assuming I could find one. Not worried about getting off the line as 1st gear is ridiculously short anyway!

cheers,

machg

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B0oStEr Mentor

B0oStEr

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Posted

What ratio is the auto diff? I think the tallest R180 ratio available is 3.54:1 but I don't know where you would find one.

If you ever have the L24 gearbox open drop in a set of overdrive gears from an L20 box. It gives you a very tall overdrive ratio and doesn't make the car sluggish in the lower gears like a taller diff does.

I had this gearset in my old L28 powered R30 and it drove very well.

I can't remember the exact revs at 100 kph but I think it was about 2600rpm with a 3.9:1 diff.

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BensDR30 Experienced

BensDR30

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Posted

I bought a new 3.54:1 R&P a few years ago & fitted it to my MR30, was a few hundred $. With the 4-speed auto it was a bit tall, but I expect it would be good in a manual or 3-speed auto. It's about to be fitted to a friends turbo MR30, as he runs out of revs with the 3.9:1 (yes, even in 5th...)

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