25-02-2013, 09:56 PM
(25-02-2013, 09:49 PM)cwspellowe Wrote: Put it this way.. can you make it smoke on boost? IF so, you need more boost.
But yeah the GT2052/56 would be a good shout imo. Mine's spooling hard and full boost is well before 3krpm, so should give you a good 2-2.5krpm of useable boost. If the piddly 9mm VE pump can make 170+bhp then i'm sure yours should be capable of the same, a GT1549 is pretty small and maxed out circa 150bhp is about on par with a maxed out T2 (one of the standard 306 turbos).
At the end of the day it's just fuel + air, if you smoke on boost you've not enough air, therefore bigger blower needed. And if as you say there's not much in the way of tuning L series engines, crack on and so it. Only one way to find out if it works! Once upon a time noone saw chronic boost in a 306, now it's readily available with so many Scooby owners upgrading blowers and parts being readily available for bolt on fitment.
The good thing about the XUD though is that we can shim the governor to raise the rev limit, so we can adapt the engine to blowers like TD04's and making the most of the higher revs, or we can increase low down fuelling and work towards faster spooling blowers with less top end.
A GT2056'd XUD would monster a TD04'd one off the line, but when the GT2056'd one runs out of puff the TD04'd one would keep going. Horses for courses.
Was waiting for you to post about the GT20's lol as most of the searches I've done come up with posts from you saying how good they are.
Yes they smoke on boost, and yes we definitely need bigger turbos but nothing has been "established" in the sense that most people with XUD's know that they can easily and cheaply bolt on a TD04 if they want to.
So seeing as we're limited to about 4500 rpm (for reliability if nothing else), would you say a GT2052/56 would be ideal?
Fuelling is not an issue at the moment although no one has "maxxed out" the fuel pump as there isn't enough air to do so.
