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  #1  
Old 03-26-2008, 11:24 PM
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Injectors thread...

Stock injectors are just that... stock. For the 617-95X the injectors are not really the bottle neck to higher performance, but they can be manipulated to give some gains. The first change is usually to change the stock nozzles from the SD241 to the SD265 found in the 60X engines. It's what is recommended by MB IIRC. They also give a bit better idle. The real only change I've found that will give a bit more HP may be the VW/Audi AAZ injectors found in the 1.9 VW diesels (canadian only versions). This is not a TDI engine, and the nozzles must be changed to MB nozzles.
PLEASE NOTE- there are mods you can do to the IP that will give much better HP gains for you efforts, and a EGT gauge is always the first step in seeking more HP.
Here are some other threads
Fuel pumkin warning
Nozzles or?

Last edited by MTUpower; 03-26-2008 at 11:29 PM.
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Old 03-26-2008, 11:41 PM
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I have a TDI that is running a set of special Bosio injectors made specifically for the TDI. I am aware that Bosio also makes IDI injectors that are compatible with VW/MBZ applications. Does anyone know about these?
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Old 03-27-2008, 04:43 AM
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Quote:
Originally Posted by validius View Post
I have a TDI that is running a set of special Bosio injectors made specifically for the TDI. I am aware that Bosio also makes IDI injectors that are compatible with VW/MBZ applications. Does anyone know about these?

If you do a Google type internet search you will find other forums and comments on Bosio nozzles. From what I have read people are happy with them and they fell there engine runs better and the have a little more power. However, for MBZ the nozzles were $37 for 617 turbo engines and that was the price last year about this time I do not know what the price is now.
For myself I prefer something more economical but still good quality. I bought German made Monark spray nozzles from C Sean Watts. I have not installed them yet as I have not hat time to do so. They are not extra performance nozzles but I have read that they are quieter at idle. Some other members have done the installation and are happy with them.
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Old 03-27-2008, 07:02 AM
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In the trucking world, many guys have their injectors extrude honed for better spray characteristics. These are multi-hole direct injection setups though. I've never seen the tip of a MB injector so I don't know if extrude honing would be applicable there.
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Old 03-27-2008, 09:55 AM
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Originally Posted by KarTek View Post
In the trucking world, many guys have their injectors extrude honed for better spray characteristics. These are multi-hole direct injection setups though. I've never seen the tip of a MB injector so I don't know if extrude honing would be applicable there.
They look like any other Bosch IDI nozzle, flat face, single hole.
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Old 03-27-2008, 10:13 AM
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Also in consideration are GTD nozzles from the 1.9L 90HP TD (VW) sold in Canada. These have 2 seperate springs, one for a pre-injection and another for the actual injection. They would make idle MUCH smoother.
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Old 03-27-2008, 12:00 PM
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Originally Posted by validius View Post
Also in consideration are GTD nozzles from the 1.9L 90HP TD (VW) sold in Canada. These have 2 seperate springs, one for a pre-injection and another for the actual injection. They would make idle MUCH smoother.
Those are the AAZ injectors MTU was talking about.
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Old 03-27-2008, 08:32 PM
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Bosio tips

Quote:
Originally Posted by validius View Post
I have a TDI that is running a set of special Bosio injectors made specifically for the TDI. I am aware that Bosio also makes IDI injectors that are compatible with VW/MBZ applications. Does anyone know about these?


Dieselgiant.com sells them. I will be putting them in my "85 300d
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  #9  
Old 03-27-2008, 11:55 PM
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I may have a second set of the AAZ injectors. Stock pop pressure is 150, but I may have them set to 135, which is what stock MB injectors pop at. With the pressure level lowered I'm hoping for a longer duration of fuel, and more fuel being injected.
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Old 03-28-2008, 07:08 AM
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I think that will advance your timing a little as well since they will pop sooner.
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Old 03-28-2008, 08:28 AM
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Quote:
Originally Posted by KarTek;
I think that will advance your timing a little as well since they will pop sooner.
Actually, they will pop at the same time as stock injectors... correct? Since they are two stage that throws a little wrench into the mix. Of course I'll play with the timing.
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Old 03-28-2008, 10:37 AM
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Originally Posted by MTUpower View Post
Actually, they will pop at the same time as stock injectors... correct? Since they are two stage that throws a little wrench into the mix. Of course I'll play with the timing.
As I have been lead to believe, the steel lines flex when pressurized and absorb a minute portion of the pressure pulse's energy, thereby causing a slight delay in injection when the pop-pressure is raised. Depending on nozzle type, raising pop-pressures above documented/specified levels may have adverse effects, but this "theory" of sorts still needs further testing to be certain..
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Old 03-28-2008, 11:24 AM
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Originally Posted by MTUpower View Post
Actually, they will pop at the same time as stock injectors... correct? Since they are two stage that throws a little wrench into the mix. Of course I'll play with the timing.
OK, I was getting it mixed up. You're saying that the stock pop pressure of the AAZ's is 150 and you may have them set at 135 like the stock MB injectors so the end result is the same pop pressure before and after. Theoretically, your timing should be the same aside from the split shot issue.
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  #14  
Old 03-28-2008, 02:43 PM
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stock pop pressire is 135PSI?

holy crap thats low....
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  #15  
Old 03-28-2008, 03:12 PM
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Quote:
Originally Posted by validius View Post
stock pop pressire is 135PSI?
135 *BAR*

Thats nearly 2000 PSI!!
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