Is there any MPG increase from 6-speed/3.63? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-18-2011, 09:37 AM   #21
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Originally Posted by Reverant View Post
Maybe in light traffic, how so on the highway?
Check the gear ratios.

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Originally Posted by hustler View Post
103whp is why. I'd do the 3.63 on the 5-speed but I'm worried it would be dreadfully slow...that's approaching vette gear ratios.
Hence my previous suggestion. If you don't want to open the 5 speed (which isn't that hard), instead you could get an S4 RX7 5 speed and switch the housings with the Miata trans. That would get you the S4 gearing in a Miata package. The S4 gearing is wider than the Miata. Coupled with a 3.9 rear would make a nice daily.

MSPNP costs what 1/3 the value of a 6 speed and diff swap and requires 0 physical labor. Just sayin'.
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Old 04-18-2011, 10:15 AM   #22
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I'm back on my unreasonable desire to build a hyper-mile Miata that I can auto-x. 01 bottom end, 99 head, mspnp, 6-speed/3.63...that would be cool. I'd practice lean, cruise tuning on the engine that's in the car though.

I paid $400 for the trans and nothing for the R&P. The MXpnp will cost me $600 for the computer and $200 for another LC-1 when they come back in stock. Labor is free.
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Old 04-18-2011, 10:24 AM   #23
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Sounds good. I'd probably only change the plan to a full 01 engine. If it's infrequently autocrossed and fuel cost is the paramount concern, I'd also tune it on 87 and 93 and table switch.

I'd suggest MS2 with VVTuner or a full on MS3X as either offers sequential injection, which would be worth a little bit of MPG.
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Old 04-18-2011, 10:34 AM   #24
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Sounds good. I'd probably only change the plan to a full 01 engine. If it's infrequently autocrossed and fuel cost is the paramount concern, I'd also tune it on 87 and 93 and table switch.

I'd suggest MS2 with VVTuner or a full on MS3X as either offers sequential injection, which would be worth a little bit of MPG.
Thanks, but I can't do all that ****. I know nothing about electronics, never soldered a board before, and wouldn't know where to start. The biggest challenge with hooking up MSpnp is wiping the saliva from my slack-jawed, neanderthal chin.

I may go ahead and throw the new gears in the car, at the least is makes the drive exponentially more relaxing. On the way back from my recent road trip I hung the tach at 4600rpm for about 5-hours on cruise so i could get home in time to get the track car aligned.
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Old 04-18-2011, 11:32 AM   #25
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I'm pretty confident that you could do it. You picked up everything else pretty fast.
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Old 04-18-2011, 12:45 PM   #26
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can I have your 3.63 for free?
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Old 04-18-2011, 12:55 PM   #27
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I will trade if You can fabricate an inconel cod-piece for me.
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Old 04-18-2011, 01:01 PM   #28
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Sure, I have a 'junk' inconel CHRA bolt here that I broke a drill bit into. I'll use that.
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Old 04-18-2011, 02:28 PM   #29
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girth fail.
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