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BMW Diesel Owners / Enthusiasts
Do you own a diesel powered BMW? Maybe a 335d or a BMW x35d? Come and talk about what makes your car great!

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  #1  
Old 12-22-2014, 09:26 PM
brettboat brettboat is online now
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335D injectors

Does anyone know of someone who's modifying the 335D injectors to shoot some more fuel at the engine? Larger nozzles or something? I'm not finding anything online.
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  #2  
Old 12-23-2014, 07:11 AM
Michael47 Michael47 is offline
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Modifying those injectors is not a home handyman job. Replacing them with higher capacity injectors is an option but most folks simply reprogram the computer to inject more fuel.
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Old 12-23-2014, 07:20 AM
9mmkungfu 9mmkungfu is offline
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Quote:
Originally Posted by brettboat View Post
Does anyone know of someone who's modifying the 335D injectors to shoot some more fuel at the engine? Larger nozzles or something? I'm not finding anything online.
Possibly overseas, but I may have seen mention of it once if that. Although I'm not sure if anyone is maxing out the factory injectors anyway.
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  #4  
Old 12-23-2014, 09:40 AM
brettboat brettboat is online now
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Red face

The fuel system is maxed out if you don't get smoke before 5 lbs at WOT. So no one knows of anyone? There's a lot more potential in these engines than just a remap, dpf delete, egr bypass, etc have to offer
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  #5  
Old 12-23-2014, 09:44 AM
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floydarogers floydarogers is offline
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Couple things to remember: the injectors are around $500 each - kind of pricey to experiment on. Also, they're piezo-electric, not the older electro-magnetic kind, makes them harder to modify, looking at the diagrams. And as another mentioned, re-programming is really all that's needed to increase fueling.

You might want to peruse this thread, as there's a guy looking into replacing the injectors: http://www.bimmerfest.com/forums/sho...d.php?t=803132
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  #6  
Old 12-23-2014, 10:30 AM
Hoooper Hoooper is offline
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Quote:
Originally Posted by brettboat View Post
The fuel system is maxed out if you don't get smoke before 5 lbs at WOT.
What?
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  #7  
Old 12-23-2014, 11:00 AM
brettboat brettboat is online now
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I want more fuel than new software alone can provide...
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  #8  
Old 12-23-2014, 11:10 AM
Hoooper Hoooper is offline
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I dont get what youre saying. The injectors can provide enough fuel to produce smoke at over 30 PSI and 3000 RPM. That would be enough fuel to be spitting raw diesel out the exhaust below 5 PSI. Your limitation at that point might be the pressure the pump can build at low RPM. How much power are you making now?
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  #9  
Old 12-23-2014, 11:20 AM
brettboat brettboat is online now
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I don't even own one yet. I'm just trying to get an idea of what kind of numbers I can make. Debating between a 335d and a tdi

Last edited by brettboat; 12-23-2014 at 11:50 AM.
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  #10  
Old 12-23-2014, 11:44 AM
Hoooper Hoooper is offline
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How much power are you making now? Or are you just trying to build a smoke machine?
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  #11  
Old 12-23-2014, 12:08 PM
Nadir Point Nadir Point is offline
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There's a handful of companies around the country doing EDM nozzle work like this:

http://www.dieselworldmag.com/hole-s...ozzle-upgrades

But like they say, proceed with caution. I believe a little would go a long way towards more power in this application.

Fuel pressure gauge is also a must-have accessory after starting down this path.
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  #12  
Old 12-23-2014, 12:25 PM
ChasR ChasR is offline
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You can get to 340 hp and 530 lb/ft of torque with just a tune for $800 to $1200. Is that not enough? With an inexpensive JBD, you can make just over 300 hp and 500 lb/ft of torque, for $279. I think you'd have to spend a lot more on a tdi to get to either of those.
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  #13  
Old 12-23-2014, 12:41 PM
Hoooper Hoooper is offline
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Originally Posted by ChasR View Post
You can get to 340 hp and 530 lb/ft of torque with just a tune for $800 to $1200. Is that not enough? With an inexpensive JBD, you can make just over 300 hp and 500 lb/ft of torque, for $279. I think you'd have to spend a lot more on a tdi to get to either of those.
with tune and deletes you can get 370 HP 540 lb ft at the wheels. Thats not maxed out injectors I dont believe
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  #14  
Old 12-23-2014, 08:49 PM
brettboat brettboat is online now
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I'm wanting to hit more around 400-450 RWHP, 800-900Ft. Lbs.... All Fuel, no Meth
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  #15  
Old 12-23-2014, 09:36 PM
Hoooper Hoooper is offline
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Interesting. Well you aren't going to do 800 lb ft at 450 whp, maybe more like 700 lb ft at that level unless you plan to do alot of work building low rpm torque, that's just the design of the engine. Planning a custom header with different turbos maybe? Is this going in something other than a 335d by any chance?
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  #16  
Old 12-23-2014, 09:41 PM
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floydarogers floydarogers is offline
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Quote:
Originally Posted by brettboat View Post
I'm wanting to hit more around 400-450 RWHP, 800-900Ft. Lbs.... All Fuel, no Meth
I'm guessing that TDIwyse has his car around the HP number, less torque. He's turned an 11.8s quarter mile that works out to about that. He's done a DPF delete, tune, scr/muffler delete and is running some meth to keep things cool.
http://www.e90post.com/forums/showth...t=quarter+mile
I would guess that anyone wanting to get to 400hp would have to do a DPF delete... from what he's said.
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  #17  
Old 12-24-2014, 08:35 PM
brettboat brettboat is online now
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Quote:
Originally Posted by Hoooper View Post
Interesting. Well you aren't going to do 800 lb ft at 450 whp, maybe more like 700 lb ft at that level unless you plan to do alot of work building low rpm torque, that's just the design of the engine. Planning a custom header with different turbos maybe? Is this going in something other than a 335d by any chance?
No, staying in a 335D. I'm just wanting to add another diesel to the fleet. I'm getting almost wrapped up with my 7.3 powerstroke build. Down to suspension, paint and body.... Still have yet to dyno it (sometime next month) but I'm guessing 475-510 RWHP, 800-850 ft. lbs. I'll spin tires if I go to WOT at 70MPH.

I've pretty much sold off all my gas vehicles, always wanted a BMW or Mercedes. Figured a 335D would be a good option. I've already shot JR auto an email asking about what all can be done, prices, etc. And if guys can be doing under 12 in the 1/4 with just tunes, DPF delete, exhaust, meth and deleting more emissions stuff I may have to settle for that.

Last edited by brettboat; 12-24-2014 at 08:37 PM.
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