I was hoping I could get a sanity check from the experts here. I'm still new to this and this seems like the right place to post this.
I'm working on a tune for my Golf mk4, AWP 1.8T. The car originally came with a "K03s" (I think K03-053). It is now equipped with a Borg Warner "K04-001" (p/n 5304 950 0001, compressor map attached). My car uses a 06A 906 032 HS ECU, xdf and bin are attached.
My understanding is that the purpose of KFLDHBN is:
- to protect the turbocharger from overspeeding
- Overspeeding is likely to happen when air density is low and a high PR is required to meet requested load
- Conditions like this exist with very high IATs, high altitudes, or both
My intention is that by modifying this map first, I should have a sane PR limit in place so that the turbo is protected if I screw up somewhere down the line. I do not intend to run close to the MAP limit so I hope these assumptions are valid.
My process for modifying KFLDHBN is as follows:
- Calculate the flow required for the engine at VE=1 using the inputs for KFLDHBN (n and IAT) and the displacement of the engine
- Multiply this by the existing PR values in KFLDHBN. The result of this should be the flow produced at the relevant IAT, engine speed, and PR
- Modify the PR values used to calculate flow in the above step from the k04-001 compressor map.
Will this at least put me in the ballpark for a sane compressor pressure ratio map? Have I neglected something important?
I couldn't attach the map pack for some reason, I got it from here.
https://nefariousmotorsports.com/forum/index.php?topic=401.0