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Old 03-20-2013, 04:38 PM   #351
Britain
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I know Matt...I do plan on calling you to for advice.

-Britain
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Old 03-20-2013, 04:52 PM   #352
icanfly
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Default custom gears...

Matt,
can you PM me pricing for a custom cut, very tall 5th gear for a 901?
I'm curious about the pricing.

cheers.

Britian, as always I love the work you're doing and can't wait to share further progress on my build.

great driving.
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Old 03-20-2013, 05:55 PM   #353
gdoggmoney
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Britain, curious why you are still using a 901 box? I know a lot of guys have moved to FWD subie boxes, or modified AWD boxes. I would think they can take the power better and are cheaper to fix and find parts for.
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Old 03-20-2013, 10:27 PM   #354
spydrb8
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It was cool seeing you guys at the autox in Marina and you gave me a lot of good ideas for my car. I ended up snapping a throttle cable 100ft. into my first run and when I checked my spares box I didn't have one with me. Oh well, I'm just glad it wasn't something worse after seeing your morning. I know they are costly but have you guys checked to see if Albins or Weddle make 901 parts? I can speak for Albins quality as that's what I'm running in my trans.
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Old 04-07-2013, 05:32 PM   #355
panel
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Britain...wondered if you could shoot a couple of pics of how you have your breather set up. Do you run the pcv valve off the intake and where are you running your lines from your valve cover vents ?
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Old 06-30-2013, 06:04 PM   #356
smyers6989
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nicce
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Old 07-04-2013, 10:20 PM   #357
onixbonilla
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Great 914! Always had a soft spot for them!
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Old 07-10-2013, 08:09 PM   #358
WrxInfantryGuy
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niceness
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Old 07-18-2013, 12:03 PM   #359
schanfarside
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super cool concept
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Old 07-21-2013, 07:50 PM   #360
mrvwcastner
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stumbled onto this thread from a UK website. Very cool to find it.

did you see GRM UTCC 818R broke 3rd gear after adding big slicks & aero package?
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Old 07-22-2013, 09:15 AM   #361
K.Linchpin
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Quote:
Originally Posted by mrvwcastner View Post

did you see GRM UTCC 818R broke 3rd gear after adding big slicks & aero package?
& Your point...?
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Old 07-23-2013, 04:09 PM   #362
Britain
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Little update on what I have been working on for the last 6weeks or so. After blowing up four 901 transmissions in two weeks, I decided to sell off the good parts and focus on fixing the problem instead. The solution to that problem is a 930 transmission and with everything I do, leaving it stock is not good enough.

Here is the 901 transmission in all it's glory. All pulled apart for the last time. I shed a quick tear...

BTW, final weight with fluid was 78lbs.


First fitting of the 930 box. Took a little bit of modifications to the top of the case and around one of the adapter bolts, bit is in place. Damn thing is big.


I had to cut off a bit of excess metal around the shock mounts to clear the side plate cover studs.


Going to need to cut the rear trunk out a bit to clear the intermediate housing. Thinking about a support bar between the cage mounts in the shape of the blue paper towels.


Rear trunk floor removed...makes working on the transmission easy.
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Old 07-23-2013, 04:10 PM   #363
Britain
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Now it is time to start working on the trans mount and adding a bar between the cage mounts.


Adding strength back after removing the rear trunk. You will notice that I left the bottom part of the trunk floor in place to keep the sub-frame in position while adding additional supports.


More of the trunk floor cut away. I am doing this in sections to keep the position of the subframe from shifting.


Scab plates in place to cover the hole in the chassis. Tubing added to tie the subframe connections in place.


Trunk/Chassis modifications completed. Truck cut out and structural bars put in it's place.


Back view of the rear structure. Lots of room back here to work on the trans from above.


Transmission case back in place.
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Old 07-23-2013, 04:10 PM   #364
Britain
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Ready to start bending tube for the transmission support.


1" DOM tubing bent for the transmission mount. Need to finish up the sub-frame mounts next.


Side view of trans mount.


Trans mount done.
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Old 07-23-2013, 04:10 PM   #365
Britain
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Another part of this adventure was dealing with the differences in bell housings depths between the 901 and the 930 transmission.


The deeper bell housing flange on the 930 trans puts the starter ring gear in a different location in relation to the flywheel. In addition, the 930 starter ring gear is 2mm larger diameter.


To adapt my 901/915 style flywheel to work in the 930, we had an adapter plate CNC machined. This will allow me to use my current flywheel/clutch set-up and a 930 starter ring gear.


Front side view of the starter ring gear adapter.


My current flywheel with 915 starter ring gear removed.


Adapter in place.


930 starter ring gear bolted on. This put the starter ring gear in the correct location in the bell housing.


930 splined clutch plates to replace the 901 splined plates that I had.
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Old 07-23-2013, 04:11 PM   #366
Britain
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Christmas in July! 930 Limited Slip from Matt Monson at Guard Transmission.


When you run a 911 gear box in a mid-engine configuration, you have the either run the box upside down or flip the ring gear to get it to spin the other direction. For a 930 transmission, this requires significant machining to both the ring gear and the case. This is the stock ring gear before machining.


Here is a stock Diff sitting in the case. You can see part of the area that the case has been machined.


Ring gear chucked up on the lathe.


Cutting hardened steel...molten lava coming off.


After about 45mins of cutting...back of the ring gear cut to fit the case. There was additional cutting required after this, but didn't get a picture of it.
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Old 07-23-2013, 04:11 PM   #367
Britain
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Another thing we wanted to do was use the same hydraulic throw-out bearing parts that were used on the previous transmission. To do this we had to machine about 8mm off the guide tube mounting location in the bell housing.


Cut thru the case in one part...nothing a bit of welding can't fix.


After a significant amount of welding and some more machining. The burn marks are from the epoxy melting.


Additional material added to the inside for strength.


Throw-out bearing guide tube mounted in place after significant modification.


Hydraulic throw-out bearing mechanism in place.


Because I am using the dual-plate clutch set-up, I had to source a early short bell housing mainshaft which has more spline engagement. Interestingly enough, this early mainshaft had a sealing surface machined in the bell housing area that allowed for the use of a 915 style input shaft seal and guide tube.


930 Shaft installed with the 915 release bearing carrier in place. Clearances are tight!


Hydraulic throw-out bearing in place for the last time. New fittings and lines with 45deg bends to run out the back of the bell housing.
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Old 07-23-2013, 04:11 PM   #368
Britain
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Another modification that we made was to make this box a 2-speed for Autocross applications. I did this on the 901 and it worked great. For this application, we ditched all the stock shift rails, yokes, etc. and just made a longer shift rod that came out the back of the transmission directly. This also reverse the shifter throw to make it match what I had on the 901.


New shift rod location with a bung welded to the nose cone to hold the seal.


The longer shaft is the new one machined to match the stock rod.


Now that we have all the parts in place, it was time for assembly. I left out the majority of the parts associated with 3/4 gear. I also cut out the center splined area for the reverse gear to further cut weight.


Dog gear parts. This transmission has no syncro's which will improve the shifting speed significantly over stock.


Transmission almost together and sealed up. Total weight with fluid was 116lbs...so I only gained 38lbs over the 901 set-up.
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Old 07-23-2013, 04:12 PM   #369
Britain
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Here is a plate we fabb'ed up to hold the vehicle speed sensor and the clutch lines.


Transmission in place, everything hooked up, ready to fire!


Success! After a couple of passes down my street I gave it a nice sponge bath.
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Old 07-23-2013, 04:39 PM   #370
spydrb8
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Looking sweet dude, hopefully it takes the punishment you guys give it. Why did you choose to flip the R&P vs. running the case upside down? My best guess is the starter interfered with the shock mount.
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Old 07-23-2013, 06:24 PM   #371
Britain
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There are a couple of reason to flip the ring gear...weight, interference with the shocks, and I was concerned about axle angle and the upper control arms on my Lotus suspension.

-Britain
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Old 07-24-2013, 12:47 PM   #372
RSti_Spyder
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Very nice! I am thinking the 930 box is a great idea for both of us. Things moving slowly here so seeing this helps me get motivated again...
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Old 07-28-2013, 03:15 AM   #373
Britain
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Here is a video from this weekend Autocross with the PacNW Region PCA in Packwood, WA. Took TTOD with this run and had an even faster run in the "fun" runs later in the afternoon.

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Old 07-29-2013, 12:36 PM   #374
scby rex
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Pretty damn quick.
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Old 07-29-2013, 01:25 PM   #375
Britain
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Here is the "fun" run video where I pushed the car another 0.5secs faster. You can see in a couple of spots where I run out of first gear and I am riding the rev limiter. You can also see towards the end where I am running out of front end grip due to aero load from the rear wing. Time for some front end aero improvements.

https://www.youtube.com/watch?v=gtSSZLxkqtI
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