510SSS Posted July 18, 2016 Report Share Posted July 18, 2016 Hey I was wondering if people think that the 4.38 would be too low of a gearing to use on the streets with an modded L20b? I'm trying to build a canyon carver, and originally thought that the lower ratio would be more responsive on mountain roads. I hope it wouldn't mean im sitting at 4k cruising on the freeway, what does everybody think? Quote Link to comment
Rjawm Posted July 18, 2016 Report Share Posted July 18, 2016 Use one of the calculators below to enter in all your applicable info and BAM! you have an answer. http://www.csgnetwork.com/multirpmcalc.html or http://www.advanced-ev.com/Calculators/TireSize/ Quote Link to comment
DanielC Posted July 18, 2016 Report Share Posted July 18, 2016 A 521 with a 4.38 runs 4,000, at 60 MPH, with 14 inch wheels. Quote Link to comment
datzenmike Posted July 18, 2016 Report Share Posted July 18, 2016 A 280zx 5 speed conversion will drop the cruise RPMs 25.5%. This means 4,000 in 4th would be 3,000 in 5th. You need an '80-'83 zx 5 speed. You get to keep your cake and eat it too. Quote Link to comment
Lozer Posted July 18, 2016 Report Share Posted July 18, 2016 im running a 4.44 with the 4 speed and yes its 4800 rpm on the freeway. Quote Link to comment
510SSS Posted July 19, 2016 Author Report Share Posted July 19, 2016 Ok thanks guys, ya I already have the 5 speed installed, I hope it won't be too buzzy on the freeway. Couldn't I swap out the ring and pinion and turn the CLSD into a 4.11 rear gear? Quote Link to comment
datzenmike Posted July 19, 2016 Report Share Posted July 19, 2016 Depends on the 5 speed. A dogleg is 14.6%. Most other 71Bs are about the same, some go as high as 19% but only the close ratio zx goes to 25% Quote Link to comment
510SSS Posted July 19, 2016 Author Report Share Posted July 19, 2016 Oh ok thank's Mike ya it is the Dogleg, do you know what car the Dogleg comes from originally? I always forget. I am thinking of getting the Wolf Creek CV Axles and just running it as 4.38, even though some Datsun pros I have talked too said don't do above a 4.11. I figured this type of gearing might be better for canyon carving and twisty roads. Quote Link to comment
datzenmike Posted July 19, 2016 Report Share Posted July 19, 2016 It was the stock standard transmission on the '77-'79 S10 (200sx) There were no 4 speeds only 5 speed and automatics. It was an optional 5 speed on the A10 ('787/'79 HL510) Gears multiply torque at the expense of RPMs. Short gears allow higher revs at lower speeds. If you want mileage and top speed then lower gears are not the best. In a strictly racing application where top speed on a track is 100MPH it only makes sense to not have gearing that allows 130 at maximum engine RPMs. Four thousand at 60 is fine you have plenty of RPNMs left for highway speed BUT you may not like this. Again a zx with 25% overdrive is the best of both worlds. I have 4.11s in my 710 and love them. Mileage recently was about 27/28 average over 3K miles. Quote Link to comment
510SSS Posted July 20, 2016 Author Report Share Posted July 20, 2016 Hmm sweet info man, guess I will just stick with the 4.38 CLSD, quicker revs are always more fun, thanks datzenmike, you're goddamn right. Quote Link to comment
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