3.9 LSD in my NB that is NA - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-04-2012, 04:00 PM   #1
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Default 3.9 LSD in my NB that is NA

Got a 3.9 to throw in the *** end of my car after I went turbo. However, I'm changing my mind on the turbo and now I wonder if this 3.9 will be a dog with my 5 spd and no Turbo
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Old 04-04-2012, 04:03 PM   #2
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Is your car a dog with the stock 4.1? If so, it will be 11% more of a dog with the 3.9. Now you can answer your own question.
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Old 04-04-2012, 04:06 PM   #3
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I have the 4.3 and it's not too bad. I guess I'm going to have to try and trade someone for a 4.3 since I flip flopped on my turbo.
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Old 04-04-2012, 04:09 PM   #4
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I do know a guy that put a 3.63 in a 1.6 stock Miata. He was interstate commuting 50 miles each way. Said it was ****-slow but it did boost his MPG to the 35 range.
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Old 04-04-2012, 04:20 PM   #5
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I currently have the 3.9 in my 99 n/a with a 5 speed, actually swapped out a 4.3. I like it a lot for daily driving but I couldn't stand the 4.3. IMO, it's just right.
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Old 04-04-2012, 04:21 PM   #6
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How much was your acceleration affected? I don't hate the 4.3, cruising at 3.5k is fine by me as I have ear plugs.
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Old 04-04-2012, 04:38 PM   #7
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To be honest it didn't really seem to be much of a change off the line, it may be slower but not enough to really cause me to care. I just wanted the cruising RPMs down.
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Old 04-04-2012, 04:59 PM   #8
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Currently have the 3.9 with the 5sp in my 01.
Love it for daily driver duty.
Haven't even floored it yet and don't plan to cause I know it will be slow as crap

Are you trying to make it as quick as possible n/a or is it just a daily?
Cause if its a daily I'd probably keep the 3.9
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Old 04-05-2012, 09:31 AM   #9
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It's primary use is for the track going forward. I intended to go Turbo it, but a deal on a RX-7 came up that I couldn't refuse. So, I have to force myself to get over being slow as ---- on the straights.

I guess I can throw it in and see how bad it does. Worse case, it forces me to brake even less than I already do eh?
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Old 04-05-2012, 09:58 AM   #10
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I'll trade you my 4.30 torsen from my 99.
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