The rest of engines are all 5 or 6 cyl so I guess they will need even more work. Best bet is to upgrade a chip, fit a intercooler of a higher powered model (maybe turbo aswell) along with the bigger injectors and you will probably gain quite a bit of power (more than that LT you drove I presume). Hope that helps a bit. Liter TDI Engine with Pump Injection System. 5. Engine – Mechanics. 6. Development of the 1.9-Liter TDI Engine with Pump. 6. Trapezoidal Piston and Connecting Rod. 8. Toothed Belt Drive. I made a car with 0.24 bosio Stock 10mm pump, sdi cams, FMIC, GT1749 VA @2480mbar produced 175 LE / 393 Nm from 2200rpm. Only difficult thing is that calibrate the pump voltages correctly. With 1,48 Bar it has a little smoke, but if it has bigger turbo it should be smokeless. Around 1,55 - 1,6 Bar. I have a 01 vw jetta with a 1.9 diesel in it. I just bought it from a guy who ran it down the highway everyday for school suposably but the turbo took a **** so I got it for a steel. So I just installed a new turbo and now it seems almost like my turbo isnt spooling up at times. When I drive it Re: GT1749VA Turbo 1.9 TDI problem with low press at high R. by brum » Wed Apr 06, 2011 12:51 pm. Big FMIC, higher air density after it. This means that the turbo has to pump more to achieve the same pressure. There is something strange in the logs. The N75 duty cycle is almost the same as the one in the first log. TDI. 2004 Golf GLS TDI (sold) May 1, 2011. #1. I figured it was time for the build up thread! Car: 2004 VW Golf GLS TDI. Engine: 1.9L Turbo-charged Direct Injected Diesel. Transmission: 5-speed (O2J) Mods: TDTuning.com Stage 3 tune, VNT-17/22 turbo, PD150 injectors, PD150 intake manifold/turbo inlet pipe, R32 airbox/3.25" MAF, Custom FMIC, 3 LocomotiveR1. The woes started with a cam belt snapping. Damaged the cylinder head , valves and injectors. Fitted a used but good cylinder head and used injectors. As the vehicle was out of service I had the turbo serviced and tested. After assembling the motor it starts fine but smokes (black diesel smoke) more than it did before the belt broke. Regarding upping the boost. The AXG engine is 150hp as standard and uses a VNT turbo which generates between 1.7 & 2.0 bar (similar to the AHY above). This on the same 2.5 engine as the AJT (mine) and even has the same compression ration of 19.5:1 so I was thinking that it would be okay to up the boost on mine a little. There's kind of two questions here. If you're asking how much boost is safe for a stock turbo, then BB has the answer 18psi or so. If you're asking how much boost you can run before you have to beef up a stock ALH block, around 28-30 psi. Any more and you'll need better rods, girdles, head studs, etc. D. The LP turbo must always be sized for the ultimate power you're targeting; adding a second turbo never magically raises this ceiling. LP turbo for power peak, HP for spool. For 400 HP, figure on between 45-50 lb/min airflow at the fattest part of the map while having efficiency >70%. Aqhq3Z.