Increased injector for My Q4

[andreaaa72]

Good afternoon
first of all sorry for my english but I don't speak english very well. This is my first post to this forum.
I'm working to modify my Q4 and I have changed the original Garrett with an ibrid turbo T3/T4. Now I need of injector with greater capacity. I want to install the Bosch injector (I can buy them at the good price) but I cannot find an injector compatible that greater capacity has one. Can you advise to me the ref. number please?

Thanks in advance to everyone.

Andrea

[andreaaa72]

UPP
Anyone can help me?

[Juan AR155Q4]

Hi!
You should check first that actual injentors are small for the output power. You should be able to measure duty cycle of them. (80%-85% maximum).
One thing you could do is raise fuel pressure, it´s an easy thing to do.
If none of these thing gives you enough fuel, then I´d go for bigger injectors.
Originals are 348cc/min (I think, somebody correct me). Some guys in here are using Siemens Deka 650cc/min, but the have bigger modifications, not just a turbo upgrade.

Hope this helps.

[cuore_sportivo_155]

is there a link or a catalog where injector capacities can be checked? I don't have a Q4 but my twinny is being upgraded and will produce quite a bit of HP so might need bigger injectors also

Obviously I'll be using a powerboost valve first.

How can the duty cycle be measured? Through the diagnostics?

[andreaaa72]

Thanks Juan
but I have modified induction manifold and the leads of aspiration in the gasket, I have installed the new pistons and connecting rods H, I have replaced the catalysts (200cps) and a lot other soon. And so I want install the new big injector because I think that the old one is not sufficient for this elaboration.

[andreaaa72]

Thanks Juan
but I have modified induction manifold and the leads of aspiration in the gasket, I have installed the new pistons and connecting rods H, I have replaced the catalysts (200cps) and a lot other soon. And so I want install the new big injector because I think that the old one is not sufficient for this elaboration.