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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > Australia > Sockets 335i build



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      10-14-2022, 02:25 AM   #4995
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Installing a lithium battery pack so I dont run the main battery down while playing the stereo with the engine off.

Battery pack and bars being supplied by a local car audio enthusiast

I like what he did with the engraving
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      11-04-2022, 06:14 AM   #4996
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Good to see SPCGRY still going with mods.
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      11-04-2022, 08:51 AM   #4997
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Originally Posted by JB4-335 View Post
Good to see SPCGRY still going with mods.
Nice to see you still around JB. What new with you?
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      11-04-2022, 11:18 PM   #4998
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Quote:
Originally Posted by Socket View Post
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Originally Posted by JB4-335 View Post
Good to see SPCGRY still going with mods.
Nice to see you still around JB. What new with you?
I'll always be around Socks. I've been busy with a muscle car of late. Been tinkering with the wife's G20 330i but think I might get myself a 335i to play with on the side as they are so cheap now. Would have to go big single though.
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      11-06-2022, 03:47 AM   #4999
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Originally Posted by JB4-335 View Post
I'll always be around Socks. I've been busy with a muscle car of late. Been tinkering with the wife's G20 330i but think I might get myself a 335i to play with on the side as they are so cheap now. Would have to go big single though.
Muscle car, awesome, got any pics you can share? Don't be tempted back to the 335 dark side mate
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      11-08-2022, 10:49 PM   #5000
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More progress on the single turbo manifold

The link pipe from the manifold to the turbo has been fully welded on. Ended up welding the inside of the divider and porting it out with a die grinder to ensure a smoother transition of the exhaust gasses. The manifold will still need the external wastegate added but that will be later once the downpipe and other parts have been made

For now the bracket for the mockup of the turbo can be removed and the turbo is now held on by the manifold only
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      11-08-2022, 11:10 PM   #5001
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One of the parts that doesn't get much info or attention is the water pipe, which can be a tricky part to make. None of the off the shelf alternatives suit RHD low mount fitment so a custom one needs to be made. This pipe also needs to have a fitting for the water feed for the turbo, and also the water feed for the auto/dct heat exchanger portion of the main radiator (not needed for manual cars).

You can buy N54 water flanges off ebay but found the flange is quite thick and results in clearance issues with the turbo once you take into account the head of the bolt. First step was to counterbore the M6 screw holes in the flange to gain some space. The turbo is mounted as close as possible to the engine block in this RHD low mount.

For the pipe itself, I 3D printed some clamps to hold it all into place while trialling fitment. One of the things to keep into account is the clearance to the downpipe Vband and ensuring theres enough space to actually fit the clamp. Making sure it doesn't interfere with the frame rail is also important (only a problem on bigger turbos) and ensuring it still mates up to the water pump without interfering with the thermostat

Luckily the part itself did not need many crazy bends or a really complex routing to work. Only required 90 and 45 degree aluminium elbows, although these were tweaked on the vice and bent to the precise angles needed to get the part perfect

Additionally some 3D printed fittings were made so the whole thing could be pressurized and tested with some soapy water to check for leaks. It is quite easy for pinhole leaks to form on aluminum welds. There was a few spots on the flange which needed to be corrected but all the butt welds of the pipes were ok
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      11-08-2022, 11:39 PM   #5002
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After having a look at the routing of the downpipe, it looks like the downpipe cannot be routed downwards even with the tightest bends available with the stock engine bracket in the way. This was going to be the preferred route to allow enough space for the wastegate recirculation pipe along with a flex joint, and also making the downpipe fairly simple to make

It is also possible to route the downpipe rearwards on top of the engine bracket, but having chosen this route previously this resulted in a downpipe that was much harder to make and a design which was not that easy to fit without following an exact sequence

So a custom engine bracket will be done to allow adequate clearance for an easy to make downpipe. A 3D design will be done and most of it will just be laser cut steel plate, so should not be too difficult to make

A jig to hold the subframe was made, and measurements were taken from the engine block of where the bracket will mount. Two of these holes are not used by the original engine mounts and only used on other chassis (like E6x/E7x models. A 3D design was made for the bracket that mounts to the engine block, then some cardboard was used to get a rough idea of the shape required for the downpipe routing. The cardboard was then translated back into the design drawing and some 3D prints will be made to verify the design
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      11-09-2022, 05:12 PM   #5003
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I can't wait to see this complete. vtl I hope it wont be a one of one kit
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      11-13-2022, 12:49 AM   #5004
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MOD 136 - Yinlong Lithium LTO battery pack

While the low mount turbo mod is being worked on (mod 135) I've been looking into increasing the battery capacity in spcgry to prevent the battery from going flat every time I do a audio tuning session. One option is to install a second battery, but space is an issue as is stuffing around with managing two batteries. Another option which is popular in the car audio scene, is to do a battery delete and replace the stock battery with a lithium battery pack. The battery pack I am looking at is one of the new tech Lithium LTO packs from Yinlong. There are 12 cells (35Ah, 2.3v per cell) configured into a bank of 2x6 cells. The resulting battery pack provides an output of 13.8v with 70Ah capacity, meaning I can run the audio with the car turned off for 24 hrs before needing a charge. The alternator charges at 14.8V which is well below the 16.2V that is considered the max for these cells. Unlike other lithium battery packs, the LTO cells are not flammable as they do not use carbon based anodes but use lithium nano particles instead. So they are apparently very safe to run, particularly at the lower voltages on the 3 series platform. Jury is still out if this will work, but will give it a try and report back EDIT.... after discussing with Vtl, seems this probably wont give the results im expecting. The battery pack is only 70aH which is less then my current AGM. So if anything this will be a step backwards....
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Last edited by Socket; 11-15-2022 at 03:06 AM..
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      11-20-2022, 03:48 AM   #5005
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MOD 137 - Rear speakers

Installing a set of rear speakers to set up deferential rear fill. Was planning to install them on the C pillars, but there simply is not enough clearance when the seat folds down. Fortunately the rear parcel shelf has cut outs for rear speakers, so it was a pretty simple job to bond in some mounting rings, run some wires and screw in the drivers. Only one problem, the cone on the speaker was touching the speaker grilles, so I had to do a hack job and cut a hole in them. Will def need to get another set and fix them up, but it will do for the moment. In case anyone is wondering the speakers are Hybrid Audio X3 widebands
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      Yesterday, 04:14 AM   #5006
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Car needs a wash but I havn't posted a pic for a while, so here you go
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