sequential turbo idea

[gldgti]

hey fella's,
well my mk3 is off the road for atleast a week or so since the gearbox started to make a bit of a bearing noise, so i'm pulling the trans this weekend to take to a buddy for new diff bearings and a bolt kit (hopefully thats all it needs).

Anyway, i'm not really happy with the T3 on my aaz, its fine above 3000rpm but its crap below that. I have been tossing up chucking a fresh k14 in there, but then i thought....

what if i put both the k14 and merc t3 in there? In the smoke tales section i noted that the twin setup that guy used on his mtdi used a gt15 which is tiny, i am thinking the k14 will give good enough response at the low end but will flow much better than the gt15 ever could, then run the merc t3 ontop.... or, vise versa. see, i know i've seen it that the smaller turbo is always plumbed in first in the exhaust line, but why? as the gasses cool, they become more dense, so might it be better (for EGT's anyway) to run the smaller exhaust housing after the larger one? I do realise that you would take a hit in the lag department though, so I wanted to hear some thoughts. seems like there are some advantages and disadvantages to both ways... thoughts?

[RadoTD]

The idea of having the small turbo first is that once you hit a certain amount of boost, the wastegate opens, dumping more of your exhaust into the big turbo.

I'm hoping to do a compound turbo eventually and I'm definitely going to be looking at K14/T3. It would increase the top end capabilities of the T3 while decreasing the lag of a T3 on it's own. With my K14 on it's own, boost lag is pretty close to zero after 2000rpm. The K14/T3 compound won't be quite that good as you need to get the T3 spinning as well, but it should still be pretty good.
Definitely sounds like a win-win to me...