935racer ;how much fuel presure are you running into your ip ? i'm assuming your using a lift pump of sorts . have you thought about boosting the fuel presure into the ip to help fuel the engine better when it's wound out ?
where is the torque? i would have thought that this thing would have made more torque
I would think that with the change to higher flowing nozzles, you were pumping more fuel into the engine and out of the pump. That increased pumping out of the pump lowered the internal pressure and retarded the pump timing. A little tap, tap on the pressure regulator and 200+ HP is yours. Andrew
So what's the OE pump setting and what would you think it needs to be at?
43.5 Psi at 1000 engine RPMs-75.4 psi at 2,000 RPMsWith regard to what it needs to be, I don't know. Those specs above would be a standard pump without load. I don't know how significant the crease in pressure would be with higher flowing injectors. I am just making what I think is a good guess. I'd give it a little tap and check to see what happens. :wink: Andrew
Hello,still waiting for 200 amazing whp from a 1.6td, respect for your reached 19x whp until yet. I think the project here is "state of the art" for IDI tuning in the moment. In germany there is a rally race rabbit, who runs with vegetable oil.They run in the last and in this year a 1.9 tdi engine, but before used first a 1.6 and then a 1.9 idi engine for serveral years. They try a lot to get as much power as possible, but i thing they did not reached 200hp with the idi engines. Last step idi was with gasser camshaft and therefore drill holes in the pistons for having enough space for the valve.Anyhow, there is a nozzle expert, specialy for using vegetable oil, but also for normal diesel. I planed to build up a race 1.9 aaz rabit and speak with the nozzle guy about best nozzle design for reached something around 200 whp. He told me that test have shown, best design for the vw idi engine are DN0SD297 injectors in KCA30S36/4DS nozzles with around 175 bar POP pressure. POP pressure must increase above 155bar, due to the higher combustion pressure due to the higher boost level. I personaly think, at your boost level (approx 2.2 bar) your need even more than 175 bar POP pressure. I run my rabbit (1.6 in the moment) with 180 bar POP pressure and thing it is a little bit to high for my boost level 1,2 bar, but should fit perfect with your boost level. They nozzle guy also tells me, that they have test bigger injectors with no benefit. Big is not even nice, specialy for the nozzles everything had to be fit good together.When i understand it correct, you have reached 193 whp with approx 1.8 bar and know reached 195 bar with 2.2 bar boost. If that is correct, you are "under fueled" in any case. Only burned fuel can make power in a idi engine, not the boost intake air. But i am sure you know that better than i do.For me it is amazing, that you get even this power by using a Ø9mm pump. But also be sure, that the camplate has be replaced. For my project i will used a camplate from a AFN DI engine with 3,4 mm lift.Also the pump has to be mod at the fly weights and/or the regulator spring. I will also mod the "timing change" piston lift for reached speed above 5400 rpm, stock upper limit.Came back to the nozzles, in my knowledge the dual spring nozzles also only for reduce burning noise not for make more power. Personaly i think it is a poor design for our goals. The mention injectors also fine for cold start, even if you have reduce the compressing level.Best Regards and good luck for 2xx whp, i am still impressed for knowing even it is possible with a 1.6 engine.
