Best injector options

[jasey8]

Hey guys I know this is an old topic but I can’t find a clear answer or maybe I missed the forum (a link would be greatly appreciated). And a tuner can be expensive. I was wondering which injectors would be best for stock Amb engine (bottom end/exhaust system Except manifold) with stock throttle body and tune, with ko3 turbo, Aeb head and IM/EM. Which injectors would fit with the b6 fuel rail on aeb IM and which would fit b5 fuel rail without running lean or rich. The car is a4 b6 Quattro 1.8t.


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[Seerlah]

Are you running an AEB head on an AMB short block, everything else stock (ie no tune)? Or you just gauging a route on how to modify your car? I ask because I can give my advice, depending on your goals and current setup. But adding larger injectors to an otherwise stock setup with no change in tune and/or hardware is not the way to go about it.

The B5 and B6 have different fueling methods, meaning the fuel rails (among other things) are different. The AEB rail is designed for a rising rate fuel pressure system. The B6 rail is designed for static fuel pressure. You can't just swap the fuel rail with an AEB one without modifying other aspects of the B6 fueling system (converting to a return fuel system). But you can run your AMB fuel rail on the AEB intake manifold as long as you use AEB components. AEB fuel rail can not be ran on the B6 unless you modify the rest of the fuel system.

[jasey8]

Are you running an AEB head on an AMB short block, everything else stock (ie no tune)? Or you just gauging a route on how to modify your car? I ask because I can give my advice, depending on your goals and current setup. But adding larger injectors to an otherwise stock setup with no change in tune and/or hardware is not the way to go about it.

The B5 and B6 have different fueling methods, meaning the fuel rails (among other things) are different. The AEB rail is designed for a rising rate fuel pressure system. The B6 rail is designed for static fuel pressure. You can't just swap the fuel rail with an AEB one without modifying other aspects of the B6 fueling system (converting to a return fuel system). But you can run your AMB fuel rail on the AEB intake manifold as long as you use AEB components. AEB fuel rail can not be ran on the B6 unless you modify the rest of the fuel system.

Thank you for responding, I temporarily going to run the aeb head on amb short block, also this is not my daily driver I just wanted to get the ball rolling (gathering the material). So far, I have the aeb head, ko3 turbo, aeb IM/EM, and b5 fuel rail. I’ve read on a forum b5 fuel rail is a good swap apart from the extra work, adding a return line also swapping the pump ( I was hoping to add the fuel rail/pump later in the build along with the tune as it’s getting rather pricey). I read somewhere that stock can hold up to a 25% increase in injector cc, again I am not sure as to the truth it may hold. Also, since the b6 fuel rail is meant for static pressure, I fear that running the aeb stock injectors may cause it to run lean, and I really wanted to get the project moving. Again, I do plan on adding the tune along with the fuel system at the same time to avoid potential problems. I was just stuck on which injectors would fit aeb IM/b6 FR for the meantime until I save up for the rest.


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[Seerlah]

Your welcome!

What is your goal/plan for your car (ie HP goals, track car, street car, etc)? What is your budget (German cars are not cheap to mod)? Is anything currently wrong with your AMB block and does your car drive (ie car is running as-is in all it's stock glory form)?

[jasey8]

Your welcome!

What is your goal/plan for your car (ie HP goals, track car, street car, etc)? What is your budget (German cars are not cheap to mod)? Is anything currently wrong with your AMB block and does your car drive (ie car is running as-is in all it's stock glory form)?

I was thinking about a street car, for hp I didn’t want to go all crazy because it gets expensive quick when parts start flying. One of the reasons for the head swap was, because the previous one had cracked as they often times do being a cheaply made amb head, also mentioned by others in forums. It will fire up and idles rather nicely for a 4 banger. But runs slightly lean to which I suspect the injectors, do you have any suggestions on some that may fit the aeb IM? Thanks.


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[Seerlah]

Is the AEB head on the car now, or you still have the AMB on? AEB injectors are longer than AMB injectors, but also flow less and I would not run them on the AMB engine management. You should be able to add un-spacers to your stock injectors to have your AMB fuel rail with stock injectors fit onto an AEB intake manifold.

https://usrallyteam.com/index.php?main_page=index&cPath=10_44_289

I doubt your injectors are the reason for you running lean, but they very much could be. I would look at different reasons why, though. For example, sensors on their way out can also cause your car to run lean (MAF, CTS, o2). Or it can be because of an issue with your fuel system from your tank to your rail (ie clogged fuel filter).

[jasey8]

Is the AEB head on the car now, or you still have the AMB on? AEB injectors are longer than AMB injectors, but also flow less and I would not run them on the AMB engine management. You should be able to add un-spacers to your stock injectors to have your AMB fuel rail with stock injectors fit onto an AEB intake manifold.

https://usrallyteam.com/index.php?main_page=index&cPath=10_44_289

I doubt your injectors are the reason for you running lean, but they very much could be. I would look at different reasons why, though. For example, sensors on their way out can also cause your car to run lean (MAF, CTS, o2). Or it can be because of an issue with your fuel system from your tank to your rail (ie clogged fuel filter).

Sorry for late response, as I was looking around as to what could be the culprit. Now that I think about it more, I think it is just the Pcv system. It’s an old car and I am not sure if the previous owners had taken car of them, since the valves are a maintenance item. I will look further into it, for current codes which are misfire, running lean, and some blow by (Some people claim minor blow by is normal for an old turbocharged car). I read somewhere that these are also common symptoms to pcv failing. I’m guessing it may have built up residue inside over time or some valves may have just completely failed (probably not). The car currently runs and drives, also idles fairly smooth for a 4 cylinder. I still plan to upgrade my injectors later on though I wanted knock this problem out first. Once I do I’ll be able to check my power numbers. Thanks for the link too, it’ll come in handy.


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[Seerlah]

Misfires cause you to run lean. It can be incomplete combustion of a chamber or no combustion at all. I would start with diagnosing the misfire issue. There are a lot of things that can cause misfires, and the most common is a simple spark plug replacement issue. After you fix your misfire issue, I suggest you tend to making your stock configuration running optimal before you start digging into mods. You want a solid platform to build your car off of if you don't plan on going with heavy mods. These cars are old, so general maintenance is a must if you don't know the history of the vehicle.