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Title: Bosch 0280155892 Injector TVUB Post by: willemml on January 31, 2025, 11:00:32 PM I've been reading through the forums and S4wiki tuning guides and just getting started trying to write a tune. I am trying to get a head start on learning how this works by reading through the community tune threads and the s4wiki page while I wait for the spare ECU I ordered to arrive. My current challenge is figuring out the KRKTE and TVUB for the injectors in my car.
I have Bosch 0280155892 (from the TT225) in my AMB 1.8t (2003 A4). I am pretty sure I have figured out KRKTE Info from https://www.injectorplanet.com/collections/bosch-fuel-injectors/products/bosch-0280155892-volkswagen-06a906031j-1 That lists injector flow as 374.1 cc/min @ 3bar so I used https://deatschwerks.com/en-ca/pages/fuel-injector-calculator to get the flow for 4bar (431cc/min) KRKTE = 50.2624*(1.781/4)/(431*0.684) = 0.075913 Does this seem like a good starting value? Stock is 0.1039 with the 263.8cc/min injectors (taken from the community stage 1 thread for 8E0909518AK) If I do the same calculations for the stock injectors I wind up with 50.2624*(1.781/4)/(304*0.684) = 0.10763 which is close ish... Now I can't find the TVUB values, and I can't seem to find any datasheets for these injectors, if anyone knows where I can find these please let me know. Or maybe given I can't find a datasheet should I just try to get the TVUB values empirically via idle STFTs? I am just looking for a starting point given I can't flash the car yet. Title: Re: Bosch 0280155892 Injector Datasheet Post by: willemml on January 31, 2025, 11:03:21 PM Just realized I posted this in Noob Guides and FAQs instead of Noob Questions... Whoops.
Title: Re: Bosch 0280155892 Injector TVUB Post by: willemml on February 17, 2025, 06:50:01 PM Spare ECU arrived, bootmode flashed it with my original EEPROM and the STOCK file from the community thread modified with a KRKTE of 0.0758. The car starts and runs fine, I drove around the parking lot in 1st and 2nd, did not log but watching group 33 live fuel trim seemed to be between -8 and +8 percent.
Title: Re: Bosch 0280155892 Injector TVUB Post by: aef on February 18, 2025, 12:32:08 AM You could have just copy pasted TVUB from the stock file of the TT 225 where they are coming from.
KRKTE from 3 to 4bar is just a % calculation. Title: Re: Bosch 0280155892 Injector TVUB Post by: willemml on February 19, 2025, 07:23:46 PM Pulled TVUB from a TT225 file. Everything seems to run well, did a log, and to my (untrained) eye everything looks OK. Thanks for the help.
Title: Re: Bosch 0280155892 Injector TVUB Post by: willemml on February 19, 2025, 07:57:24 PM Figured I would add for anyone wondering in the future... Here are the TVUB values I ended up using:
7.9552 1.57353 9.9968 0.952119 11.968 0.621411 14.0096 0.413385 15.9808 0.272034 I used a KRKTE of 0.075913 I am using the stock bin from the 8E0909518AK-0003 community project. Though it would be easy to use the tuned bin I want to learn how to get there step by step rather than flashing a complete file. |