27-04-2012, 09:30 AM
The T2 is way too small, past about 5000rpm, it wouldn't even supply the air demand that the engine needs. Think about how much power a T2 will actually make on an XUD9 - about 140-150hp, not to mention it's at a lower RPM... They're seriously crap turbos, wouldn't provide more air than the engine could demand anyway... Gotta remember airflow requirements, not boost - boost is only a measure of inlet restriction.
Turbo behind the engine - I personally wouldn't bother, seriously, stick it in the battery box, the 16v heads are quite big and it'd take some serious engineering to make the manifold fit with a turbo on... You're going to have driveshaft/steering rack fouling problems if you try it down there.
As far as management goes - essentially I wouldn't bother with anything stock, yes the S/C GTi6s use the whole MAP before the butterfly which is before the SC - yes it works, but it's a complete lash up, means your entire intercooler, pipework, SC is under vacuum off the throttle, causing stalling, crap throttle response, and anyhu, it would have to be proportional to engine RPM - which a Turbocharger isn't...
Either go Megasquirt or Emerald IMO. Emerald - yes it's more expensive, but there's people in this country who seriously know what they're doing with it. If you fancy having a go with the mapping yourself and doing the electrics/electronics yourself - megasquirt all the way and save yourself a few quid whilst doing it.
GT25/860R or around that mark is going to be what you're looking at, very capable turbo, but very little lag - do a bit of reasearch and you'll find they come off quite a few cars as standard!
You shouldn't need to uprate anything too much to begin with, 1.8 cams are fairly mild as standard which is good for a Turbo setup, lairy cams and turbos don't go together...
Get someone to make the manifold and downpipe for you, equal length is nice, but I wouldn't worry so much!
Turbo behind the engine - I personally wouldn't bother, seriously, stick it in the battery box, the 16v heads are quite big and it'd take some serious engineering to make the manifold fit with a turbo on... You're going to have driveshaft/steering rack fouling problems if you try it down there.
As far as management goes - essentially I wouldn't bother with anything stock, yes the S/C GTi6s use the whole MAP before the butterfly which is before the SC - yes it works, but it's a complete lash up, means your entire intercooler, pipework, SC is under vacuum off the throttle, causing stalling, crap throttle response, and anyhu, it would have to be proportional to engine RPM - which a Turbocharger isn't...
Either go Megasquirt or Emerald IMO. Emerald - yes it's more expensive, but there's people in this country who seriously know what they're doing with it. If you fancy having a go with the mapping yourself and doing the electrics/electronics yourself - megasquirt all the way and save yourself a few quid whilst doing it.
GT25/860R or around that mark is going to be what you're looking at, very capable turbo, but very little lag - do a bit of reasearch and you'll find they come off quite a few cars as standard!
You shouldn't need to uprate anything too much to begin with, 1.8 cams are fairly mild as standard which is good for a Turbo setup, lairy cams and turbos don't go together...
Get someone to make the manifold and downpipe for you, equal length is nice, but I wouldn't worry so much!
