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If you're doing all that work, then surely it would be rude not to add a quick BMW K-series 16v head swap at the same time. Make the most of all that 'charged air.
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Why do you need a dumpvalve with the supercharger?
If you're re-building the 'box get Nitrac to cryo-freeze the layshaft and gears while you're at it.
This is a 10-15k build you realise?
Brommers
NurseHolliday
@IR
https://www.youtube.com/watch?v=w359Y9c25dc
Latest development in the super charger vs turbocharger series.
As much as I'd like to flex my tig welding skillz and tryout the new machine by making turbo manifolds this has tipped the balance and made me want to go supercharged 998 even though turbo 1275 would cost me less and make far more power but this is more about a nice reliable street car.
Thinking 998 a+ block (I have a 998+ engine going spare anyway) rebored +060 and decked, forged pistons (dished) and rods, all balanced, bigger valved 5 port head, kent 276 cam, 1.4 rockers, duplex timing chain, podifold, eaton m45 off a BMW mini blowing through a metro turbo HIF44 carb and plenum, intercooler off a renault 5 turbo, LCD exhaust manifold and single box rc40 pipe. Megajolt ECU.
Rebuild gearbox with straighcut gears from swiftune and a crosspin diff.
Gonna terrorise everyone by sounding like I'm constantly in reverse because of the gears + the wine of dat supercharger.
https://www.youtube.com/watch?v=T1tsMtmjg60
Edit: not looked at suitable dump valves yet so suggestions welcome.