Microcontroller

I'll probably do that, boxkita. Thanks for the suggestion.

Okay, so I just downloaded the 2010 OB FSM. The 6MT for the 2.5L Turbo model has the EXACT same gearing as the 2015+ WRX non-STI. Even the FDR is the exact same. Looking at the assembly, it's almost identical to the 2015+ WRX. Only a few little changes here and there. I don't suppose anyone has done a 3.9 FDR swap to a 2010 LGT? I guess if I really wanted to:

I've never owned a manual car before (driven them, but not extensively). I kinda wanted to ask this too. The EWR for first gear on my 5EAT is 11.58288, the EWR for the Spec B is 14.1804 (with a 3.9 FDR). The Spec B obviously has more leverage in 1st gear. Is this because it's a manual, because it's a sporty transmission, or both? Do you think having 6th gear as a cruising only gear would be an issue? To me, it makes sense that 6th gear is just for cruising, but I don't have lots of manual transmission experience. Ooo, that sounds marvelously expensive. As for the 2010 Outback 6MT, I never considered it, nor did I know it existed. I'll do some research on it and if it shares parts with other vehicles that can be switched around. I contacted MRT Performance, they said they haven't tried something like that. Although, they suggested I just put some bigger tires on it. I gotta laugh at myself, I never thought of that. I guess I should state my intentions with my car while I'm at it. I come from Toyota. Getting 21.6 MPG with 93 has certainly been an adjustment from 35 MPG with 87. I know I should expect this really, but 21.6? Really? I live 30 minutes from work and I like to take long road trips. Don't get me wrong, I want to make my car fast, but 6th gear to me is not the go fast gear. 6th gear, to me, should be the get-good-gas-mileage-and-drive-comfortably gear.

Ya, I considered that. I'm not sure how reputable eBay sellers are, but I found a few EZ30s paired with 6 speeds. Unfortunately it still would've had a slightly higher EWR. If I do this, I want to do it someway that isn't a trade off, especially if it SEEMS like it doesn't have to be. It's also nice to know that I'm in good company with those who like the EZ30. Thanks for that.

Actually, as I'm looking at parts.subaru.com, the aforementioned 06-07 WRX uses the same open front diff as the '15+ WRX. The diagrams show the pinions both have 8 teeth and look similar. I'm wondering if the 3.7 ring will fit in place of the 4.111 one. The new WRX has a 6th gear of 0.666, combined with a 3.7 ring, I'll get a EWR total of 2.4642! Does anyone have any input for if they will swap right, or if there is a reason not to use the new WRX transmission?

I've been day dreaming about doing a manual swap. I've got a 5EAT in my OB 3.0R. It's FDR is 3.272 and 5th gear is 0.834. This gives me a total Engine RPM to Wheel RPM ratio (called EWR from now on) of 2.728848:1. I've been thinking it would be cool to do a manual swap (I don't mind doing wiring, nor buying a wrecked manual legacy/ob to pull parts from). It's probably more realistic to just get an OBXT/LGT manual to start with, but I love my EZ30. However, I've noticed that most cheap 6 speeds I can find have a 6th gear of 0.756 and a final drive of 3.9. This gives me a EWR of 2.9484, this is about 8% higher than my current EWR. I want lower revs at highway speeds, not more. Then I started doing some research about the transmissions in the US Spec Bs and JDM Forester STIs. Their 6th gear is 0.707. That is good. Then I found that the 06-07 WRX non-STI manual has a FDR of 3.7. The EWR for this hypothetical build is 2.6159, which is 4.1% lower than my current EWR. I know it would be a pain and expensive collecting all the parts from all different vehicles, but would it be possible to grab the 3.7:1 ring and pinion from the 5 speed WRX and stick it in a 6 speed transmission? I don't know what is swappable between 6 speeds and 5 speeds, if anything. This is what my question is. I know a 4.1% lower EWR won't do much. At 70 MPH, RPMs will go from ~2333 to ~2237. 4.1% lower speed means 4.1% more torque to make the same power for cruising. I'm hoping this will push the engine further into the low BSFC range and save me some fuel. Even if it doesn't, it would still be cool to have a Frankenstein's monster transmission.