TDIMeister
Phd of TDIClub Enthusiast, Moderator at Large
I've been going through a database of turbo maps and found one from Garrett that I believe is a very good match for a "Top Gun" TDI, provided it's mated to an appropriate turbine (that search is still underway, but I've already seen some candidate GT22/23 frame-size VNT turbines with available A/R ratios of 0.74........).
The compressor can support running a pressure ratio of 3.5 (~36 PSI) @ 28 lb/min mass airflow in a single-stage with still 72% efficiency.
To put this into perspective, I calculate that you can only achieve 28 lb/min at 36 PSI boost on a 1.9 TDI with extremely good intercooling (and likely water/methanol injection), head work, cam and running the engine at 4750 RPM. With adequate and proper fuelling, this could support 280 HP on a 1.9L TDI... Note, I am not saying you will get 280 HP with this turbo; I'm saying it can support (with all of the above mods to START) this power level. You'd have to drop the compression ratio substantially, but there's some help on the subject.
Problem: It's not a compressor that I'm aware you can just find from any other OEM application. You'd have to go to Garrett and specify the whole designation C226 (60mm) 50 Trim, 0.51 A/R, and then they might reject having this compressor at all...
The compressor can support running a pressure ratio of 3.5 (~36 PSI) @ 28 lb/min mass airflow in a single-stage with still 72% efficiency.
To put this into perspective, I calculate that you can only achieve 28 lb/min at 36 PSI boost on a 1.9 TDI with extremely good intercooling (and likely water/methanol injection), head work, cam and running the engine at 4750 RPM. With adequate and proper fuelling, this could support 280 HP on a 1.9L TDI... Note, I am not saying you will get 280 HP with this turbo; I'm saying it can support (with all of the above mods to START) this power level. You'd have to drop the compression ratio substantially, but there's some help on the subject.
Problem: It's not a compressor that I'm aware you can just find from any other OEM application. You'd have to go to Garrett and specify the whole designation C226 (60mm) 50 Trim, 0.51 A/R, and then they might reject having this compressor at all...