martinlink
10th October, 2016, 10:05 PM
Hello, clever people of Digital Kaos! :)
I have messed with this car for about 2 years now and it is almost perfect, finally.
It's an e46 320d 150hp 5-speed manual. EGR completely removed, both cats empty, new Garrett gt1749v turbo, swirl flaps deleted etc. + a remap.
After fitting the new turbo, removing swirl flaps and decatting, the boost comes in a bit later (~2100rpm instead of 1800rpm) and it has a small spike which is overcorrected by the N75.
I have the necessary equipment to run tests and make turbo logs etc., and I have made a few runs today - here's one of them:
3rd gear 1500rpm, full throttle:
402899
As you can see the N75 is over-reactive (there's a boost spike up to 2,65bar, then a loss of boost, then another spike) and boost maxes out a bit too late for a small turbo like this...
So the question is, is it possible to correct these issues with tuning? e.g. have the N75 hold the geometry shut a little more until 1800rpm and then let it open a bit faster, but not too fast like in the graph? Or is this a problem with the hardware (turbo etc)?
I will attach two logs in .csv format, both in 3rd gear. If you need any more logs etc. to help me, I'll gladly go make them. Maybe together we can make this car perfect :)
Thanks a ton!
-Martin
I have messed with this car for about 2 years now and it is almost perfect, finally.
It's an e46 320d 150hp 5-speed manual. EGR completely removed, both cats empty, new Garrett gt1749v turbo, swirl flaps deleted etc. + a remap.
After fitting the new turbo, removing swirl flaps and decatting, the boost comes in a bit later (~2100rpm instead of 1800rpm) and it has a small spike which is overcorrected by the N75.
I have the necessary equipment to run tests and make turbo logs etc., and I have made a few runs today - here's one of them:
3rd gear 1500rpm, full throttle:
402899
As you can see the N75 is over-reactive (there's a boost spike up to 2,65bar, then a loss of boost, then another spike) and boost maxes out a bit too late for a small turbo like this...
So the question is, is it possible to correct these issues with tuning? e.g. have the N75 hold the geometry shut a little more until 1800rpm and then let it open a bit faster, but not too fast like in the graph? Or is this a problem with the hardware (turbo etc)?
I will attach two logs in .csv format, both in 3rd gear. If you need any more logs etc. to help me, I'll gladly go make them. Maybe together we can make this car perfect :)
Thanks a ton!
-Martin