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DIY supercharger porting

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2.9K views 5 replies 3 participants last post by  BaD_81  
#1 ·
I know this might cringe/upset some of the professional mechanics we have on here, and I apologise for that! I am in no way trained as mechanic and therefore my DIY work isn’t up to the best standard, but I enjoy working on my car and (hopefully I don’t!) even if I break it at least I was giving it a go! So please be nice to my untrained abilities.

anyway, disclaimer over!

First you start by removing the air box and connected pipes (to the front and to the big black oil catch can intake thingy ma-bob).
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then you remove the big black air intake oil catch can thing. There is a jubilee clip on the throttle body at front to undo and 3 bolts at the back - 2 are easily seen and one is hiding behind the metal heat shield, all 3 are star bolts (apologies don’t know their technical name!).

You then need to be careful of the black tubes feeding into the top of it - you don’t wanna break them if you don’t have replacements lined up. Disconnect it from the black air box end and you can leave them hanging from the crank case. And now due to a wire, I moved the black air box to the front of my engine bay so that it was out the way.

I then removed the belt from the supercharger + alternator side of the engine (you can do this first before taking anything off the engine, whatever you fancy!)

You have the supercharger exposed now and there are 6 star bolts holding the top of the supercharger casing to itself, undo these and you can then remove the supercharger casing.

the supercharger is now exposed and if you’re reusing the gasket be careful in taking it off the supercharger, you don’t wanna break it (I know it’s better to get a new one but they’re hard to come by so I reused mine).

there are then 4 bolts I believe holding the supercharger to the actual engine, once you have undone these the supercharger is now loose. Mine took a big of wiggling and manoeuvring to find a suitable path out. I think I pushed it slightly towards the car (seats) and then rotated towards drivers side wheel and then it came out easily - might be wrong that’s the best I can do from memory!
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#2 ·
You then need to remove the bolts from the face of the supercharger (can’t remember how many but I think) 8 bolts holding it on. You then need to work the plate away from the main body of the supercharger, I used some padding and a rubber mallet to ease it off.
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Obviously all of the oil will now come out so be careful! I took this plate off with the supercharger vertical to avoid mess - as you can see I still made some! Pour the old oil into a container (which you don’t love) and do away with it . I let my supercharger sit and drain for a while because obviously can take time for more oil to drop out the housing, wait as long as you want and trust me there’ll still be more!

You can then ease the rotors and gears out of the housing and leave yourself with just the housing.
Now comes the fun bit as you have many hours of grinding (depending on the usefulness of your skills and tools). I reckon I probably spent a good 5 hours in total grinding away (mostly coz my tools are cheap, £30 dremel off Amazon and a £10 burr set off Amazon too).
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now I know I could’ve taken more off but if I hadn’t mentioned already (😉) I’m not a professional and I didn’t wanna mess it up! So I did as much as I could (before my burr tools all were defaced 🤣) and as much as I thought was defo safe that I wouldn’t ruin my supercharger.

Yes I did clean all the metal out of my supercharger before piecing it back together! And I put fresh oil in it too (it is advised to change the bearings - but I didn’t - and the gasket for supercharger casing - but I didn’t).

then obviously do everything in reverse and put it all back together nicely, making sure not to miss the small pipe connected to supercharger casing, the pipes going to crankcase and the small third bolt behind heat shield for the intake black box! Tighten the jubilee clip and make sure everything is torqued back to spec - I didn’t coz I couldn’t find it. I created my own torque spec that some of you may be familiar with, it’s called VFT torque. And it’ll do the job plenty fine!

I have a video of me doing a pull in the car, so I will upload that if I can find out how to!🤣 and I am yet to run tests to see intake temps etc etc, I will upload these at some point if people want them!
 
#4 ·
I am searching for other things but hit this one and only 1 quick question if you don't mind!
What have changed in vehicle as per your experience?
Like better mileage, quick response, more HP, just anything that you felt after?

I guess 1 year is a good period for test!
 
#5 ·
Sorry for delayed response! To be honest I can't really comment on any obvious changes from this mod. I run a larger crank pulley and a cold air intake - which provided more noticeable changes. The supercharger whine is more pronounced and so smiles per gallon is improved, but I'm not 100% sure of any real performance gains. I didn't very aggressively port my supercharger, though I imagine the difference would be much more noticeable if it was a more aggressive port :)
 
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