Hmm...can't remember the saab turbos specs... were they a .63 hot side? and a .42 50trim cold side. I've seen some "upgraded" 900 turbos...but i think most stockers had our .42 compressor already with the much more gasser friendly .63 hot side...Joe
i could probably have it runnin with the merc turbo tomorrow
The merc 300D one is the one I use on my application at the moment. It is nice...you do get a bit more lag on the low end, but when it wakes up it goes quite nicely. I'm still awaiting my R520's and a finished intercooler setup here before I really play but I had it sustained at 30psi/35psi without any issues and the power was AWESOME in 3, 4 and 5!. The 300D unit I'm using is the 50 trim .42A/R cold .48 A/R hot... Joe
The merc 300D one is the one I use on my application at the moment. It is nice...you do get a bit more lag on the low end, but when it wakes up it goes quite nicely. I'm still awaiting my R520's and a finished intercooler setup here before I really play but I had it sustained at 30psi/35psi without any issues and the power was AWESOME in 3, 4 and 5!. I wish I had a tach in at the moment (working on that...harder adapting the early dash style gasser tach to work...) to tell you exactly where spooling starts... and R520's to really give you an idea of full power. Though, with the 216's and the pump configuration....it really flies at the moment, etc...so, it'll be interested to see what is said here The 300D unit I'm using is the 50 trim .42A/R cold .48 A/R hot... Joe
QuoteActually if you search the forced induction forum on the tex you'll find that peeps have already tested that, I believe it was done on a turbo R32 and they found no power gains from going 3" to 4"......My point was that on a wee little 1.9 TDI that'll maybe rev to 5000rpm will never flow enough exhaust to take advantage of a 4" DP, I'm not making this up, if you plug the #'s in you'll see what I mean, I'm simply arguing the science of it.Hilfolk why don't you try running a GT22???Haha vortex :roll: The reason they didn't see anymore power is because their turbo was too small, plain and simple. If the turbo is so small that there was no difference between a 3" and a 4" downpipe than it proves the turbo is the choke point, the turbine can only expel so much gas, true. But it can create all sorts of pressure and choke the engine to death. If the turbine outlet is only 2" than a 3" downpipe will likely be good enough, if its a 2.5-3" outlet than you will undoubtedly see gains from a 4" downpipe.A 1.9 will need a 4" downpipe when its running a large turbo thats needs to spool up as soon as possible or if the goal is to keep all temperatures and pressures as low as possible. If you want to argue the science, than do that, theres no science in that r32 test, or they would have measured the drive pressure difference's, egts, oil temps, etc
Actually if you search the forced induction forum on the tex you'll find that peeps have already tested that, I believe it was done on a turbo R32 and they found no power gains from going 3" to 4"......My point was that on a wee little 1.9 TDI that'll maybe rev to 5000rpm will never flow enough exhaust to take advantage of a 4" DP, I'm not making this up, if you plug the #'s in you'll see what I mean, I'm simply arguing the science of it.Hilfolk why don't you try running a GT22???