09-29-2016, 12:38 AM | #1 |
Major
566
Rep 1,290
Posts |
JB4 - not reaching boost target?
Hi
I'm new to JB4, and was testing map 5 with WOT, this is a close to stand still to max revs in 2nd gear attached is the JB4 log I see the boost doesn't reach its target, being about 4 psi below (blue and pink curves), is this to be expected? Is there a protection for 2nd gear ? I have the basic out of the box configuration, so no max boost in user adjustments for any gear. I'll try to do another test in map 1 to compare.
__________________
2017 M550i | Sophistograu
Previous cars: 2014 F30 ActiveHybrid 3 | 2012 f20 M135i |
09-29-2016, 02:09 AM | #2 |
2JZ-GTE
2959
Rep 3,948
Posts |
Try a 5th gear pull to redline
|
Appreciate
0
|
09-29-2016, 04:53 AM | #5 |
Brigadier General
1738
Rep 4,496
Posts |
Less likelihood of wheelspin in 3rd gear and upwards, sampling for log is easier/more accurate if revs don't rise quite as quick + I think DME has some tapering of boost in 1st and 2nd to save drivetrain
__________________
Fettled M135i EB AT - gone but not forgotten:
AW M2 DCT |
Appreciate
1
Chicken_Joe606.00 |
09-29-2016, 05:59 AM | #7 | |
Major
566
Rep 1,290
Posts |
Quote:
I did have a tiny bit of wheel spin in 2nd gear indeed, not much though, and the DME witholding boost makes sense as well, explains why DME boost and DME target also don't align. I'll do another run in 3rd gear.
__________________
2017 M550i | Sophistograu
Previous cars: 2014 F30 ActiveHybrid 3 | 2012 f20 M135i |
|
Appreciate
0
|
09-29-2016, 06:24 AM | #8 |
Major
566
Rep 1,290
Posts |
Just one remark, this test run highlights even more the need for chassis reinforcement, i feel the car is in dire need of LSD to distribute torque to the wheels, and the underbody reinforcement plate, anti roll bars and front struts bar i have scheduled will definitely help.
I think too many people tune their engine to achieve numbers and neglect the chassis :-/
__________________
2017 M550i | Sophistograu
Previous cars: 2014 F30 ActiveHybrid 3 | 2012 f20 M135i |
Appreciate
1
donkey458.50 |
09-29-2016, 06:25 AM | #9 |
Brigadier General
1738
Rep 4,496
Posts |
__________________
Fettled M135i EB AT - gone but not forgotten:
AW M2 DCT |
Appreciate
1
Chicken_Joe606.00 |
09-29-2016, 06:27 AM | #10 |
Major
566
Rep 1,290
Posts |
Thank you, I had indeed read this before asking and was indeed curious why the actual and target boost didn't align, as they mostly do in all the samples attached.
__________________
2017 M550i | Sophistograu
Previous cars: 2014 F30 ActiveHybrid 3 | 2012 f20 M135i |
Appreciate
0
|
Post Reply |
Bookmarks |
Thread Tools | Search this Thread |
|
|