donJimenez
Passed Driver's Ed
- Location
- St Augustine, Florida
- Car(s)
- 2017 GSW 1.8t
I read about trims, FOL, afr, etc and have no idea what it means, except it can blow your engine.
7
So, where can one go for a primer in turbo/boost/tune parlance?
- Thread starter donJimenez
- Start date
jimlloyd40
Autocross Champion
- Location
- Phoenix
- Car(s)
- 2018 SE DSG
Just use the search function and start reading threads.
donJimenez
Passed Driver's Ed
- Location
- St Augustine, Florida
- Car(s)
- 2017 GSW 1.8t
I did. A lot of information here. Still, and even w George's JB4 posts, some explanations missing. I landed on his post on BMW Tuning which I found super informative and fit the bill.
Thanks for these.
Those are all JB4 related terms. As you know, the JB4 is a way you can increase boost, but it's really not how the ECU actually works. The JB4 is just a fancy boost controller.
Just keep in mind it takes air+fuel+timing to make power. You use as much air as possible while keeping compressor happy, then you make sure you add enough fuel, then you advance timing as much as you can. That's really all there is.
Jovian
Drag Racing Champion
- Location
- Denver, CO
- Car(s)
- 2016 VW GTI
I wrote this up for the basics but the MegaSquirt link in it goes over things in a lot of detail https://www.carworklog.com/2017/02/09/when-i-chipflashtune-a-car-what-am-i-actually-doing-to-it/
FOL is fueling open loop: It's really just the JB4 lying about the fuel pressure value so the car raises fuel pressure.
Trims: You want this value under 45. This is value is essentially how hard the car is trying to correct for a fuel target discrepancy. In my experience, after 50, you'll start missing lambda (fuel) targets.
AFR: You want to be in the 13s while in boost, 12s are even better. You're limited based on the base ECU flash.
DME_BT: is the value the ECU is programmed to run
Boost: Is the pressure value at the intake manifold.
Target: That's the value the JB4 wants to run or add.
Some awesome videos in this playlist - tuning fork is the man
https://youtube.com/playlist?list=PL23CE8458E3FF37C0
https://youtube.com/playlist?list=PL23CE8458E3FF37C0