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Default Regarding boost buildup, 500-700rpm delay, N55/e85 BEF - 03-30-2017, 05:39 AM

Hey guys,

This is something that has been constant since I've started running the BMS BEF, though I never payed it too much mind:

From the time I go 100% pedal there's this 500-700rpm delay from the point that I mash the pedal @ 100% and the time it takes for close-to-full-boost to build. For instance in this log [a short beginning-of-3rd gear run just to capture what I'm describing] from 2985rpm I go 100% pedal, then not til 3418rpm it begins to achieve 20psi [peaks shortly after that to 21psi], so that's roughly 500rpm of lag before the boost feels solid and hits. Driving it though you notice this very strongly, and always happens without fail, can never get it to near-full boost until anywhere from 3300-3800rpm, never under that. In real time this 500-700rpm delay is 3-4 seconds from the time I hit pedal.

Is there something that can be adjusted to where this can be decreased? Would menu 11 do it? Never went over 4k on menu 11 because of the overboosting, so I keep it a tick or two under 2k. Is there something within the flash spool-related [table/s etc] to where it could remedy this a bit?

I noticed on Wedges tunes over on e90post that peoples N55's as soon as they mash the pedal it achieves near-instantaneous near-full boost, I mean there's a tiny bit of lag/etc, but not like this I don't think. [I've seen several people log 20ish psi @ 2900rpm on his tunes].

Thanks for reading, sorry about the novel, just wanted to lay it all out. Sorry if this sounds nit-picky. Cheers

100k miles, newer plugs/coils, 51f outside temp
Attached Files
File Type: csv 2017-03-30 07_52_20.csv (4.1 KB, 55 views)




11' 335i xDrive e90,

JB4 ISO Map 7 @ 20psi, ISO_14 Firmware, BMS/MHD e85 BEF, xHP Stage 3 TCU Flash, Flex Fuel Adapter, Rev3 Connect-Kit, 50% e85 mix/93 octane, K&N drop-in filter, ER Chargepipe, JB4 CAN-flap disabled, VRSF **, VRSF 7in. FMIC,

Last edited by primamateria; 03-30-2017 at 06:15 AM..
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Steve @ BMS/Fuel-It!'s Avatar
Steve @ BMS/Fuel-It! Steve @ BMS/Fuel-It! is offline
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Default 03-30-2017, 09:17 PM

Based on what I can see of that log, it looks pretty normal to me.

Lower your FOL to 90, 100 may cause you issues and given your trims, you don't need it that high any way.



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Default 03-31-2017, 02:04 AM

Quote:
Originally Posted by Steve @ BMS/Fuel-It!
Based on what I can see of that log, it looks pretty normal to me.

Lower your FOL to 90, 100 may cause you issues and given your trims, you don't need it that high any way.
Hey Steve, thanks for the reply. I'll drop it to 90.

Yeah I spoke with T through email and he said normal as well. He also mentioned to do a log in 4th @ 1500rpm or so and ride it out to get a good log of spool. Told him I'd do that within the coming days, maybe even this morning since I gotta go to my buddies shop.

Thanks again brother




11' 335i xDrive e90,

JB4 ISO Map 7 @ 20psi, ISO_14 Firmware, BMS/MHD e85 BEF, xHP Stage 3 TCU Flash, Flex Fuel Adapter, Rev3 Connect-Kit, 50% e85 mix/93 octane, K&N drop-in filter, ER Chargepipe, JB4 CAN-flap disabled, VRSF **, VRSF 7in. FMIC,
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Default 03-31-2017, 04:28 AM

overtorque related timing flatline down low, between 3400 and 3800 rpm, you report close to 600ft.lbs at this low RPM (way too high), something wrong in the flash.


FBO N54 AT 135i 'vert with JB4 and Trebila Performance custom flash
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Default 03-31-2017, 12:04 PM

Quote:
Originally Posted by trebila
overtorque related timing flatline down low, between 3400 and 3800 rpm, you report close to 600ft.lbs at this low RPM (way too high), something wrong in the flash.
Hey Treb,

Overtorque related timing, like hitting a torque limiter and timing being pulled, is that what happened? I noticed the timing between 3400 and 3800 [like you pointed out] drops to 1.7 across cyl 2-6, which it dropped, is that what you're referring to? I report 600 ft/lbs? Where do you see that at?

Sorry, pretty new to the tuning/flash side of things. So somethings wrong with the flash? Hmm, odd, it's ran pretty good up until now. What would you recommend Treb? Steve or Terry, what do you make of what Treb said? Should I reflash the e85 bef?

Thanks for the reply by the way, appreciate it.




11' 335i xDrive e90,

JB4 ISO Map 7 @ 20psi, ISO_14 Firmware, BMS/MHD e85 BEF, xHP Stage 3 TCU Flash, Flex Fuel Adapter, Rev3 Connect-Kit, 50% e85 mix/93 octane, K&N drop-in filter, ER Chargepipe, JB4 CAN-flap disabled, VRSF **, VRSF 7in. FMIC,
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Default 04-01-2017, 05:26 AM

reported torque is under duty cycle curve.
to read it, divide the value shown by the mouse pointer by 7.5, and you have the actual torque value in ft.lbs.

yes, a torque limiter is certainly reached, inducing timing flatline on all cylinders.


FBO N54 AT 135i 'vert with JB4 and Trebila Performance custom flash
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Default 04-01-2017, 06:04 AM

Quote:
Originally Posted by trebila
reported torque is under duty cycle curve.
to read it, divide the value shown by the mouse pointer by 7.5, and you have the actual torque value in ft.lbs.

yes, a torque limiter is certainly reached, inducing timing flatline on all cylinders.
Thank you Treb for the information and response, appreciate ya

Just to add, I flashed the xHP Stage 3 mapping this morning, I had planned on doing this once they released it. Apparently though xHP didn't actually remove some of the limiters for the xDrive models. [bahn knows more about this than me].

Quote:
Originally Posted by bahn
There's no benefit of raising the TCU limit to 1000nm if the transfer case is going to step in at ~550.
I'll post a log here in a bit.

Driving to work this morning I did a bunch of driving in M mode, shifts amazing and feels much quicker as a car.




11' 335i xDrive e90,

JB4 ISO Map 7 @ 20psi, ISO_14 Firmware, BMS/MHD e85 BEF, xHP Stage 3 TCU Flash, Flex Fuel Adapter, Rev3 Connect-Kit, 50% e85 mix/93 octane, K&N drop-in filter, ER Chargepipe, JB4 CAN-flap disabled, VRSF **, VRSF 7in. FMIC,
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Default 04-01-2017, 03:47 PM

Quote:
Originally Posted by primamateria
Thank you Treb for the information and response, appreciate ya

Just to add, I flashed the xHP Stage 3 mapping this morning, I had planned on doing this once they released it. Apparently though xHP didn't actually remove some of the limiters for the xDrive models. [bahn knows more about this than me].



I'll post a log here in a bit.

Driving to work this morning I did a bunch of driving in M mode, shifts amazing and feels much quicker as a car.
How does this log look in terms of the torque limiter/tables being hit? This is a fresh log from about an hour ago after flashing the xHP stage 3 ots map.

Sorry, figured I'd ask because I still don't understand the duty cycle value divided by 7.5? So for this log would I divide the 54 under duty cycle by 7.5? If that's the case then it comes out to 7.2? I'm lost hah.

Thanks again

Cheers
Attached Files
File Type: csv xhpe85befjb4.csv (15.3 KB, 33 views)




11' 335i xDrive e90,

JB4 ISO Map 7 @ 20psi, ISO_14 Firmware, BMS/MHD e85 BEF, xHP Stage 3 TCU Flash, Flex Fuel Adapter, Rev3 Connect-Kit, 50% e85 mix/93 octane, K&N drop-in filter, ER Chargepipe, JB4 CAN-flap disabled, VRSF **, VRSF 7in. FMIC,

Last edited by primamateria; 04-01-2017 at 04:08 PM..
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Default 04-03-2017, 02:15 AM

in your log: duty cycle of 4125 -> 550 ft.lbs

I don't see any torque limiter interventions anymore.
but AFRs are too lean for me.

currently working on an Xi to raise reported torque without hitting torque limiters.


FBO N54 AT 135i 'vert with JB4 and Trebila Performance custom flash
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Default 04-03-2017, 02:38 AM

Hey treb, thanks for the reply.

PM'd you regarding some things.




11' 335i xDrive e90,

JB4 ISO Map 7 @ 20psi, ISO_14 Firmware, BMS/MHD e85 BEF, xHP Stage 3 TCU Flash, Flex Fuel Adapter, Rev3 Connect-Kit, 50% e85 mix/93 octane, K&N drop-in filter, ER Chargepipe, JB4 CAN-flap disabled, VRSF **, VRSF 7in. FMIC,
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