I went to a 3.9 on my NA 280Z and noticed quite an improvement. I believe with the turbo engine most people go with the 3.7 because you get more use out of the turbo that way.
3.70 vs 3.90 R200 open diff
Hi guys,
I am currently in the process of swaping a BW T5 and a R200 into my 240z. Currently my car is running the stock L24 motor with a racing cam but i would like to replace it soon with a L28et with approx 300 whp. The car is going to be a daily driver for the most.
What is the real world performance difference between the 3.70 and the 3.90 diff's and if it enough to warrant holding out for a 3.90 rather than going with the cheaper and easily accessible 3.70 diff? Also how much do most 3.90 R200 cost?
I am currently in the process of swaping a BW T5 and a R200 into my 240z. Currently my car is running the stock L24 motor with a racing cam but i would like to replace it soon with a L28et with approx 300 whp. The car is going to be a daily driver for the most.
What is the real world performance difference between the 3.70 and the 3.90 diff's and if it enough to warrant holding out for a 3.90 rather than going with the cheaper and easily accessible 3.70 diff? Also how much do most 3.90 R200 cost?
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The gear ratios in the T5 work best with the 3.54 gear.
The gear ratios in the later model NA 5 speed (81 to 83) work best with a 3.90.
The gear ratios in the early 5 speed works best with a 3.54.
A friend of mine did a T5/3.90 setup and as I told him, the gears run out too quickly.
when selecting a rear diff ratio, you must also consider the ratios of each gear in the trans.
The gear ratios in the later model NA 5 speed (81 to 83) work best with a 3.90.
The gear ratios in the early 5 speed works best with a 3.54.
A friend of mine did a T5/3.90 setup and as I told him, the gears run out too quickly.
when selecting a rear diff ratio, you must also consider the ratios of each gear in the trans.
1 - 4 of 4 Posts
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