[LanduytG]

Soon we will have available new injector nozzles. These are being custom made in Italy and will be available in stock and 20% over. The factory uses state of the art machines and every nozzle is inspected for quality. Once I figure out how to post pics I will put some up. My partner was over in Italy last month to tour the factory.

More to come.

Greg

 

[LanduytG]

These nozzles will be less than a 1K. The nice thing about injectors is it gives you go smoooooth power from bottom to top.

Greg

 

[LanduytG]

I have a set of Dmax injectors here but it would be tuff to get the whole picture of how they work. What I have been told by a few techs is that its not the electical end failing its the mechanical end (nozzle) When the nozzle wears it will allow fuel fuel to return to the tank. If the nozzle is worn it can hang up causing power idle, lot of smoke etc. I am sure their are cases of the eletrical end going out but you just don't hear about that much. With new nozzle all you need to do is pull the injector take the nut off a pull the old and replace it with new. Now you have a very inexpensive repair compared to having to buy new. For the do it your selfer its great. We have been doing nozzles on the VW TDI for about a year now and it has been great. The quality of these nozzles are unbeleivable. They way they are made is so the fuel will spray out in a cone shape instead of a stream. Now you have better combustion which makes for more power. We have a few sets that should be here in the US for testing within the next month. I don't expect to have any for sale till the first of the year.

Greg

 

[LanduytG]

The nozzle includes the needle. These two parts are machined together and the needle is lapped to the nozzle. I for one do not beleive the soft seat thing. Bosch has been makes injector nozzles for a long time so I would think that they would know what they are doing. My guess we be that a bunch got passed QA. The Dmax is not the first high pressure system they have delt with.


As for cheap rebuilds our nozzles will make it very reasonable. Not sure if Bosch has authorised any of its shops to work on the Dmax injector or not. If I remember I will ask my Bosch shop the next time I am in there.


GregEdited by: LanduytG

 

[LanduytG]

May be a stupid question, but how will a 20% larger injector nozzle effect performance/fuel economy? What's the good/bad?

With 20% over you can still have economy if you don't flog it all the time. A go thing about larger nozzles is you get more fuel in the same stock injection window. Hence you get more time to burn the fuel which will make more power.

The thing I have seen with nozzle replacement is torque. You will HP increase as well but injectors can really give you more torque.

Greg

 

[LanduytG]

You will get a little increase in smoke. But with added fuel the boost will also go up a bite.





Greg

 

[LanduytG]

We have a shippment of nozzles coming in on Friday. Not sure what we have in it for the Duramax but their should be something, stock or oversize.

Greg

 

[LanduytG]

20% larger "hole" or opening in the nozzle at the same fuel pressure will yield a 20% larger flow of fuel. The problem is that unless you can change the duty cycle so that the injector is running less open time when out of the boost, then you will be running 20% more fuel all of the time. The PCM or computers on most gas cars use the O2 sensor to read the AF mixture and adjust the timing on the injectors so that they don't run too rich. The diesel does not use anything like this and I believe cannot correct the on time of the injectors to compensate for the added fuel in a low demand situation like low load. If they do, then it would have to be based on boost pressure and air flow alone with no way to know that the injectors are larger. Someone in the know, let me know how the PCM would correct for a 20 % larger constant flow from the injectors and keep the engine from running too much towards the rich side all of the time.

You can have larger injectors without having excess fuel. When driving down the road it takes X amount of fuel to move the truck. Now if you are putting more fuel in do to larger injectors then the computer will see this and the fuel management system to cut back which in turn gives you the same amount of fuel as before. Now when the throttle is wide open you will see the effects of the larger injectors. These will work fine and I am sure those that try them will see.

JK
As far as Bosch nozzles with soft seats I never did buy that. They know how to make nozzles and it was dirt doing the damage. These Boiso nozzles are coated as well.


Greg