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January 18, 2020, 05:31:55 PM
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Author Topic: 4.11 gear swap  (Read 3325 times)

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Offline snow_bound26

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4.11 gear swap
« on: August 27, 2014, 07:49:19 AM »
So who is the transmission expert in eastern NY? Live in Lake Placid but am willing to travel a bit but don't want to drive down to the city for instance. Am looking to go 4.11 FD and want to talk with a specialist about the best route and which years offer this for parts. Will be using the car for hill climbs, HPDE and the occasional auto x. Will eventually be running a custom stage 2 tune with a torque preference. Other driveline parts m planning on are:
Exedy stage 1 clutch
Primitive Racing flywheel
Carbon driveshaft

If it makes sense then RA gears 1-4 and keep OEM 5th for DD.

Offline FastfreddyRs

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Re: 4.11 gear swap
« Reply #1 on: August 27, 2014, 09:24:38 AM »
What year and model car do you have you are swapping this into.  It can be achieved a number of ways
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Offline snow_bound26

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Re: 4.11 gear swap
« Reply #2 on: August 27, 2014, 01:25:17 PM »
05 9-2x Aero. Looking to eventually have around 300 wtq. I know easiest way is an RS  tranny and rear dif, but I want to make sure I have strength. So I am also wondering if there are any years wrxs used that ratio. I know LGT also has that FD but the gearing is longer and essentially feels the same.

Offline VT Samsquamch

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Re: 4.11 gear swap
« Reply #3 on: August 27, 2014, 01:33:24 PM »
04-08 Forester XT had 4.11 or 4.44 gearing, they seemed to have relatively good durability as a result of the final drive.  Early JDM WRX's had 4.11 and 4.44 gearing.  Ebay usually as a few for sale.
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Offline deadlydave

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Re: 4.11 gear swap
« Reply #4 on: August 27, 2014, 02:20:08 PM »
Warning: Not a specialist. And my car is a streetable Autocrosser with the EJ205/VF39/huge FMIC/stock bugeye trans+diff, so it's almost the opposite of what you're looking to build.  Though I do have a 9lb flywheel and unknown but very stiff/grabby clutch.

The WRX has only been available here with the 3.9FD.  Besides the LGT and JDM solutions, the Outback XT may have also had the 4.11 FD.  The Baja Turbo did, but they're so uncommon that it's easier to find imported JDM stuff.  For a car that was still going to see a lot of street time, I'd probably go with the LGT takeoff parts.  Also, for me, fuel costs will factor into my eventual HPDE attendance.  4.44 will bankrupt me, as I'm averaging sub-20 mpg with the stock 3.9. 

Offline snow_bound26

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Re: 4.11 gear swap
« Reply #5 on: August 27, 2014, 02:28:16 PM »
Right now running Cobb stage 2 I'm getting 29 mpg. For me I really want to build this for the hill climb events I'm going to do in VT. I want quicker closer ratios but oem 5th for highway. I drive to and from SLC every year. HPDE and auto x won't b too often and I'd rather put money toward hdpe then auto x if I have the choice.
My initial thought is keep my tranny and swaps parts from an LGT but if I'm going to open the case wouldn't it make sense to put stronger gears in at the same time which brings up cost. Or will oem gears be strong enough when you factor in the 4.11 ratio? I know I can get an RS drivetrain fairly cheap but will I be sacrificing durability? Or, is it fairly similar to a wrx in terms durability?

Offline Turbaru

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Re: 4.11 gear swap
« Reply #6 on: August 27, 2014, 04:49:45 PM »
Quote
for the hill climb events I'm going to do in VT

 :evil:

See you there !!  4.11 is a good choice.
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Offline snow_bound26

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Re: 4.11 gear swap
« Reply #7 on: August 27, 2014, 07:39:25 PM »
:evil:

See you there !!  4.11 is a good choice.

I figure it's the best compromise between DD and occasional racing. Which events do you do? I'm going to do at least Burke and Okemo. Hopefully both Burkes.

Offline snow_bound26

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Re: 4.11 gear swap
« Reply #8 on: August 27, 2014, 08:31:30 PM »
So been doing more research and once again have come back the 05/06 LGT tranny. Other then a clutch, flywheel, and rear dif, what else would I need for this swap? Does the LGT have a speedo ring in the tranny? If not, how would I get the speedo to work? Or would it be more worthwhile to just pull the parts to swap the center diff and get the appropriate rear diff and stick with wrx gears and get a speedo ring from Rallispec?

Offline FastfreddyRs

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Re: 4.11 gear swap
« Reply #9 on: August 27, 2014, 09:22:59 PM »
Look at the older jdm 4.11 Trans.  A lot less parts to swap over   The jdm Trans will retain your clutch.  Speedo possibly axles depending on the year but since it's a wagon you could most of the older 93-00 axles   You keep your drive shaft    I have used a number of the jdm 4.11 and  4.44 gearboxes nice ones can be found for a good deal if browse some of the jdm importers or even eBay jdm 4.11 Wrx

Use this chart to check the Trans number against. Some of the importers have them listed wrong.
http://subarugears.narod.ru/Index.htm

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Offline Turbaru

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Re: 4.11 gear swap
« Reply #10 on: August 27, 2014, 09:31:39 PM »
I figure it's the best compromise between DD and occasional racing. Which events do you do? I'm going to do at least Burke and Okemo. Hopefully both Burkes.
Nice, Burke is sweet, I took FTD there this weekend.
Have done them all except for Ascutney, headed there for the first time in 2.5 weeks!
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http://www.hillclimb.org/

Offline snow_bound26

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Re: 4.11 gear swap
« Reply #11 on: August 28, 2014, 06:03:48 PM »
does anyone know a calculator for applying final drive ratio to gear ratio to figure out what your speed will be in each gear?

I think I've settled on an idea that might be best for my application.  Flat Irons has an LGT 1-4 conversion kit with all needed parts.  I want to compare gears and FD for both my 3.90 and a 4.11 to see how much of a difference there really is.  Their price on the kit is really quite good and I might be able to do this in the spring when I get back from Utah.  So next step is finding a good trans specialist.  Anyone have recommendations for one?
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