Terror_Flynn
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« on: March 20, 2014, 07:00:37 AM »
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Why do the 1.8t injectors look different? I mean for example the 225tt injectors have a long tip/nozzle.
And other injectors from another engine code have the usual design/look on the nozzel.
Any special benefit for the 225tt nozzle together with the 5v cylinder head?
Does it have something to do with optimal spray pattern?
Which design is best if you are looking for bigger aftermarket injectors?
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Audi A4 Avant 1.8t Quattro -2001 (AWT)
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Terror_Flynn
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« Reply #1 on: March 26, 2014, 01:14:38 PM »
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An another injector question:
What duty cycle does the original 150ps 1.8t injectors have when you run an stage 1 software?
Is it close to the limit even with stage1?
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Audi A4 Avant 1.8t Quattro -2001 (AWT)
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notfastwes
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« Reply #2 on: April 01, 2014, 12:15:28 PM »
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Terror_Flynn
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« Reply #3 on: April 04, 2014, 09:23:20 AM »
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Thank you! That link had good info.
I think I'm gonna try to run injectors from an Saab turbo engine. Bosch -431 high impedance 358cc @ 3 Bar/43 psi
What I don't know if the size of the injectors and the connector will fit an 1.8t engine.
Does VAG have an 4 bar/58 psi FPR? Which car does it come from?
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Audi A4 Avant 1.8t Quattro -2001 (AWT)
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Terror_Flynn
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« Reply #4 on: April 09, 2014, 04:38:41 AM »
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It seems that I already have an 4 bar FPR on my car. (original)
In that case I am gonna get even more out of my Saab 358cc injectors.
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Audi A4 Avant 1.8t Quattro -2001 (AWT)
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Terror_Flynn
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« Reply #5 on: June 04, 2014, 07:45:40 PM »
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I even found bigger injectors in a box that I have forgotten. Green Bosch 968:s from a Volvo S60R car. 465cc @ 55psi
Could be useful in the future.
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Audi A4 Avant 1.8t Quattro -2001 (AWT)
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nyet
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« Reply #6 on: June 04, 2014, 09:36:32 PM »
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Terror_Flynn
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« Reply #7 on: June 07, 2014, 08:25:09 PM »
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Sorry, I don't understand what you getting at.
Do you mean I should go with the 2.7t injectors instead of my Bosch 968 "green giants" ?
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Audi A4 Avant 1.8t Quattro -2001 (AWT)
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nyet
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« Reply #8 on: June 08, 2014, 01:01:57 AM »
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Just thought it would help.
I assume the green giants you're referring to are the same as the ones the 2.7t guys used back in the early days.
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Terror_Flynn
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« Reply #9 on: June 08, 2014, 05:38:50 AM »
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Yes, your link was helpful.
My green giants injectors seems to have the right connector but they are longer than original injectors so I have to use spacers for the fuelrail.
And in the link I could see that the injectors flows about 520cc @ 4bar
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diagnosticator
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« Reply #10 on: April 20, 2015, 03:55:27 AM »
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As an example, the AMB standard injectors are the short nozzels, and flow 273 cc/min. The same head/intake port design is used for the TT225 BAM 1.8T the stock injectors for the BAM flow 386 cc/min. The stock BAM injectors are extended spray tips. This is needed because of the increased spray volume, the extended spray tips limit the expansion of the spray cones and limit wall wetting from fuel in the intake port runners. Fuel/air mixture control is very difficult to achieve when fuel wets the intake port walls, extending the evaporation time and delaying mixture formation. When large fuel delivery volumes are required, extended spray tips help maintain accurate fuel/air mixture control by preventing wall wetting of the intake port walls with fuel.
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Terror_Flynn
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« Reply #11 on: May 07, 2015, 09:38:54 AM »
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Thanks for the good explanation about injectors. But why doesn't every car manufacturer use injectors with longer tips if it is beneficial for fuel atomization and reduce wall wetting in the intake runners/intake port?
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Audi A4 Avant 1.8t Quattro -2001 (AWT)
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joshuafarwel
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« Reply #12 on: August 11, 2023, 06:07:38 AM »
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I appreciate you explaining this. I have the 980cc bosch injectors and while shopping for extensions i wasnt sure whether or not to get the top hat extensions and let the nozzles protrude into the manifold or get the extensions that go on the bottom to keep it like the stock injectors. My main priority is to get as close to stock wall wetting characteristics. I think copying 225 wall wetting maps will get me as close to perfect as possible since i chose to use the top hat extensions and have the extended tip in the manifold. As an example, the AMB standard injectors are the short nozzels, and flow 273 cc/min. The same head/intake port design is used for the TT225 BAM 1.8T the stock injectors for the BAM flow 386 cc/min. The stock BAM injectors are extended spray tips. This is needed because of the increased spray volume, the extended spray tips limit the expansion of the spray cones and limit wall wetting from fuel in the intake port runners. Fuel/air mixture control is very difficult to achieve when fuel wets the intake port walls, extending the evaporation time and delaying mixture formation. When large fuel delivery volumes are required, extended spray tips help maintain accurate fuel/air mixture control by preventing wall wetting of the intake port walls with fuel.
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