injector data - EMERGENCY

[rs200]

PLEASE...

have somebody data for 3b and AAN injector.

how much fuel did give 3b and aan injector on :

3b ??? cc - 3bar fpr
3b ??? cc - 3.5 bar fpr
3b ??? cc - 4bar fpr

aan ??? cc - 3bar fpr
aan ??? cc - 3.5bar fpr
aan ??? cc - 4bar fpr

please help...

thanks

[loxxrider]

I believe 3b in a 200 20v is ~290 or 300 cc at 3 bar

you can do the calculations for 3.5 and 4 bar

[donce]

3b is 305cc at 3 bar.
aan is 280 cc at 3 bar

[loxxrider]

I thought most AAN's use a 4 bar FPR

[Audi Parts Guru]

By increasing the fuel pressure from 3 to 4 bar you can only expect an approximate increase of about 10% in terms of fuel flow

[S2central.net]

I've never done this on a flow bench, but the math I've seen for injector flow calculations would yield much higher than 10%.

I'd need to dig out the manuals but factory info is approx 300-320ccpm for 3B injectors at 3bar and similar/same amount for ABY/AAN at 4bar

ABY/AAN injectors have four-holes for improved spray pattern versus 3B variety, but the 3B item actually flows more fuel at the same pressure.

[S2central.net]

Here is one calculator on-line... scroll down to pressure change section.

3bar = 43.5psi
4bar = 58.0psi

http://www.gtsparkplugs.com/InjectorSizeCalc.html

For 320cc at 3bar this yields ~370cc at 4bar - at least on paper anyway - never did build an injector flow bench !

[prj]

Works the same in the real word.

[Audi Parts Guru]

I've never done this on a flow bench, but the math I've seen for injector flow calculations would yield much higher than 10%.

Trust me Paul, I have a set of TVR injectors in my ASNU flow bench at the moment and I measured the fuel flow rate at 3, 3.5 and 4 bar. The difference between 3 and 4 bar was approximately 10% in terms of fuel flow rate. Granted this figure will vary slightly depending on what injectors you are actually flow testing, however it is a fairly good guide.

You must always remember that the good old law of diminishing returns also applies here. For example, if you increase the fuel pressure by say 30% then you'll probably only get an increase of something like 10% for fuel flow. If you increase it by say 60% then you'll probably only get an increase of say about 15% for fuel flow. So therefore there will come a time whereby increasing the fuel pressure WILL NOT INCREASE the fuel flow rate at all, it will only have a slight affect on the spray pattery and therefore fuel atomisation

At the end of the day though, you simply must remember that you're trying to force a liquid through a few holes which are nothing more that a fraction of a millimetre in size

[prj]

What you are saying is incorrect.
Flow is a pretty damn simple calculation. Putting a shroud of "black magic" over it does not make your claims true.

Here is flowbench data:


You can see that increasing pressure from 3 to 4 bar increases fuel flow by approx. 20%.
Doing the math suggests exactly the same.

There won't also be any "diminishing returns". What will happen eventually is that the injectors will start leaking and latency will increase massively. Try running 3B injectors at 5 bar, and you will see what I mean.

[S2central.net]

Its simple laws of physics to me too I must admit... That graph seems to match the theory alright.

[Audi Parts Guru]

What you are saying is incorrect.
Flow is a pretty damn simple calculation. Putting a shroud of "black magic" over it does not make your claims true.

Here is flowbench data:


You can see that increasing pressure from 3 to 4 bar increases fuel flow by approx. 20%.
Doing the math suggests exactly the same.

There won't also be any "diminishing returns". What will happen eventually is that the injectors will start leaking and latency will increase massively. Try running 3B injectors at 5 bar, and you will see what I mean.

Well I'm not sure what flow bench these people are using, however I do have the ASNU flow bench, and this is the ONLY fuel injector service station that has full approval by Bosch in Germany. I can flow test pretty much any petrol fuel injector. I can also vary the pressure from 0 to 10 bar and if necessary, pulse the injectors to 10,000 RPM. The machine will also pulse the injectors from 3% right up to 100% duty cycle.

[S2central.net]

Not being funny here... but how do you calibrate such a flowbench ?

Could you post results of your findings for 3B or ABY injectors from say 3bar to 5bar using your bench. Its a bit curious that your real-world experience doesn't match the theory and why other benches supposedly do.

The other thing is that if your findings are correct then RS2 injectors shouldn't be suitable for power levels exceeding 370ccpm (rated 3bar flow) x 110% (your alleged flow improvement at 4bar) x 85% duty cycle = 345bhp when we know that many people happily run them in 4bar applications to 380bhp which is what you would expect for 85% of capability at 4bar.

[prj]

Well I'm not sure what flow bench these people are using, however I do have the ASNU flow bench, and this is the ONLY fuel injector service station that has full approval by Bosch in Germany. I can flow test pretty much any petrol fuel injector. I can also vary the pressure from 0 to 10 bar and if necessary, pulse the injectors to 10,000 RPM. The machine will also pulse the injectors from 3% right up to 100% duty cycle.

You still have not posted any numbers.
Sorry, but claiming that "I am right, because I have expensive equipment" is not going to get you very far.
Put that expensive equipment to use and show some results. Also please explain how your findings defy the laws of physics and all the other flow bench data, that I have... plus what Paul said about RS2 injectors and hp.

[Jamo]

When it comes to injectors and calculating flow rates http://www.rceng.com/technical.aspx

Always been bang on the money for me