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You can, you could go to an 80mm(I think we have an 85 currently) but we would be over spinning the impeller after about 6700rpm. I dropped my rev limit from 7600 after I found I was over spinning it by 6%
Yeh my previous pistons shat the ring lands. I lowered the compression slightly using the meggy gasket as I was struggling to out anymore than 15* of ign advance in without it detonating. So lowered it to be a bit safer. It certainly doesn't feel like it's suffered for it, and when I comp tested...
Yes mate, and the pro alloy radiator too. I'm not sure if the intercooler is a restriction in itself, as I've opened up the restrictor 4mm I total and gained 2psi. And for a supposed 400bhp charger it's not looking to be flowing very well.
Inner cv boot then. Yes it's new shaft time. As a professional, I would advise you shouldn't drive on it (if it siezed it'll do all sorts of damage) however in reality it's been fine for however long the boot has been missing, and another 2 days probably wouldn't hurt.
Badger5 had a demonstration of this from terraclean a few weeks back as he was genuinely interested. his 300bhp k1 LCR, made 3bhp more afterwards. so all in all 1%.