Bit of a change in plans as I was going to use Marham to test the car but its now been postponed until the end of May so I've got a bit more time. I've been painting panels over the past few weeks when I've had a bit of free time here and there, the majority of things are done bar the shell now. I ended up using a light grey high build primer (as £27/5L vs £100+/5L for a color) can't be justified at this point, considering it does not have a cage and if something needs modifying/welding once its been used I dont want to be grinding off more expensive paint. Once I'm happy with the car/shell I will paint it properly once and for all - putting the effort in with the prep and primer should pay off in the long run anyway whenever that may be.
Hopefully get round to doing the shell in the next week or so once I know all the welding/modifications have been done. I had already cut out the standard servo mount on the N/S (same place on all E30s) and welded it up. Also plated up any other holes that are not needed in the bulkhead. The main reason everything was being blanked is I was going to swap the standard servo/master cylinder setup for an aftermarket pedal box - allowing me to choose separate master cylinders for front and rear.
Although the lead time on the type I wanted was 2 weeks+, and Marham was 3 weeks away, so not enough time for any errors. So I ended up forgetting that idea and making a one-off setup as below. Since then Marham has been postponed so in hindsight I could have actually gone with the pedal box, but I've made it work now so there's no need for it as of yet.
As I have previously mentioned the Servo/MC on an E30 is usually on the N/S (regardless of it being RHD or LHD), so it was always going to be an issue with the SR20DET having the exhaust/turbo on that side also. Last time I moved the whole servo/MC setup over by ~40mm to get the required clearance, but it was never an ideal solution.
I decided on this shell I wanted to move the whole setup to the other side, with it being RHD, it would be directly behind the pedalbox like on a Clio for example. The problem was as far as myself and a couple of others could find no one else had really done this. There was one person who had flipped the whole standard setup over 180degrees on a LHD shell, meaning the servo was on the RH side, but that was only done to fit an M5 V10 engine. Far from ideal as this new shell was to be RHD and I didn't want the 'link bar' behind the dashboard loosing feel in the pedal.
Basically with the linkage mechanism removed and the pedal box mounted to the car, this is what you are left with. The top circle is where I need the clevis for the pedal to connect to, the second lower circle is a reference to the engine bay side in the lower picture.
Ideally I needed it to be slightly higher to match the height of the pedal connection. On the second image you can see an X penciled onto the bulkhead, this about as high as it can go before having issues with the servo rod hitting the top of the pedal box.
The next major problem was the overall diameter of the servo. I wanted to retain the Clio (182) servo as its a dual diaphram and one of the smallest diameter/slimmest cobminations readily available to get from breakers. The E30 ones are larger, and I even looked at using an S14 one which is a tad bigger than a Clio one also. So I set about working from the dimensions of that.
Obviously the mounting point would have to be moved inward slightly to clear the inner arch, but when I set about measuring that up I hit problem number 2 - I could only gain around 10mm due to the clutch master cylinder being mounted on the pedal box inside also. If I wanted to go further than 10mm over, I would have to re-fab the whole pedalbox and move the clutch MC over too. This in turn would cause more issues as I would not be able to use the standard throttle linkage either!
10mm seemed like it would be enough thankfully after measuring a couple of times, so I marked the bulkhead up first. Obviously the servo has a large round piece of pedal sticking out of the back, so the bulkhead would have to be chopped (along with the pedal box) and then plated back up.
Before marking up and cutting the pedal box I decided to check what the maximum length of servo and master cylinder combination would fit before it would be touching the suspension turret. Near enough bang on 220mm dependant on diameter of master cylinder. The Clio servo and master cylinder combo came in at 200mm so I could carry on..
The chosen point on the pedalbox was marked and drilled..
You can see the position of it in relation to the reference hole mentioned in the first few pictures, quite a bit higher and 10mm further over. Next came the holesaw and grinder..
Leaving me with a channel for the back of the servo to sit in..
I then marked up the two bottom servo mounting holes on the pedalbox and drilled them. Slotted the servo into position and used the grinder to get the perfect amount of room inside the pedalbox..
The clevis comes through in the correct position and the red line indicates where the pedal pin usually goes. The clevis on this (spare) Clio master cylinder has been chopped down from when it was on a Mk1 clio, normally its a lot longer and will meet up with the pedal mount even in its highest positon.
Even better (and thanks to the careful measurements) the clutch master cylinder fits perfectly in its stock position with no modification
So now the pedal box would accept the servo, I needed to cut the bulkhead so it would fit through also. From the markings made earlier I double checked the measurements and cut it out...
Then bolted the pedalbox to position inside the car and slotted the servo into position for a trial fit..
It would not 100% sit flush at first, so I took the best tool in the box (hammer) to the inner arch to give it a bit more room. After giving a select few areas a bit of modification it slotted in perfectly. As you may have noticed with the cuts this means there is going to be a hole in the top of the bulkhead where the servo passes through..
Not to mention nowhere for the top two servo mounts to bolt to. With the servo being sat slightly proud of flat, I used some 2mm plate bent to 90degrees for a start. Then to give me a bit of a 'hump' so it would clear the servo I used a piece of 45mm roll cage tubing and a hammer to shape the piece of metal. Once I was happy with the position, I marked and drilled the two mounting holes.
After loosley bolting everything into place again I tacked the plate into place and welded it all the way round. Then removed the pedal box and welded the underside also..
Obviously there was going to still be a great gaping hole in the bulkhead that was originally there. So cut a bit of 2mm plate to shape and welded that in too, didnt turn out too bad considering the bulkhead is like a coke can in thickness.
Now everything was welded I covered the lot in seam sealer to protect it. I tidied up the cuts on the pedal box and painted that also. Then put the pedal box back into place and bolted the servo up for one last trial fit..
Versus the old setup on the other side..
As the servo comes through to the inside everything lines up as previously seen..
I just need to swap out the spare Clio servo for a standard one with a full length clevis which will line up perfectly. Im quite happy with how everything fits and its another part of the conversion worked out as it proves its possible to move it to that side.
Previously I used the Clio 182 cylinder which has a 22.2mm bore, but I had issues at Oulton with a really long pedal. After some calculations and help over on E30Zone it turns out it simply just does not shift enough fluid for the brake setup I have - 4pot fronts and soon to be E30 Touring rear calipers. I could do a direct upgrade to an E30 M3 master cylinder onto the Clio servo which has a 25mm bore, but I could still go larger again as the Clio servo gives plenty of assistance.
A few more days of research came to the conclusion I can fit (with a slight bit of modification) a Nissan R33 GTR (or Nissan 300ZX) master cylinder, which has a 27mm bore and two outlets on the engine side - perfect. The rod inside the Clio servo will need to be wound out slightly, and the mounting holes on the master cylinder moved inwards slightly, but all the other dimensions check out to be perfect and it should fit into the space available! Il update more on that once I have one ready to fit.
So there you have it, servo moved to the right hand side on an E30. More soon!