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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 06-17-2019, 10:13 AM   #7181
Pov06
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Quote:
Originally Posted by CarbonZHP View Post
Anyone know where the value that controls when the o2 sensor activation is? Currently fighting to keep the car alive on cold start until the o2 begins compensating.
Fixing the symptoms and not the root cause is not the right way to solve this
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Old 06-17-2019, 11:58 AM   #7182
donBogi
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Why are we retarding the cams at high rpm and load again?


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Old 06-19-2019, 09:56 AM   #7183
10le
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Gas dynamics reasons (retarded exhaust cam--> max overlap; retarded intakecam--> max time for the sonic wave to came back and push air into the cylinder, small over pressure (1.02bar). The old race engines run max. overlapping (advanced intake cam & retarded exhaust cam). Modern engines run retarded exhaust and intake cam,
but M54B25 do not react to this.
Tried both, but no positive feedback of the engine.

All I explained is for max power (high rpm and full load) for all other points it is different!!

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Old 06-20-2019, 11:28 AM   #7184
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That was also my problem, it reacts best at default values. Very unsatisfying


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Old 06-20-2019, 12:05 PM   #7185
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Does anyone know what the map "id_pvs_fl__n" does? My guess is limiting the full load tps value, but why? None of the values are 81 or what the max value is for the throttle body.

And what is the difference between the maps "c_ti_ad_(max/min)_cyl_lam" and "c_ti_(max/min)_cyl_lam". Wondering since im trying to get the fault codes 202/203 and 227/228 to only come on when it acually is "off-limits".
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Old 06-20-2019, 12:11 PM   #7186
loliipop1337
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Found the first question on the wiki, read past it first. But the second question still stands.
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Old 06-20-2019, 04:13 PM   #7187
scorpionreptyle
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2.5 engines are the most maxed out on top of its power, to feel positive effects you need a gain of at least 20 hp ,..gain that is not software achievable. 2.5 guys should focus on midrange improvements,rather than top. For top, better,higher flow is required,and that implies hardware changes.
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Old 06-21-2019, 05:48 AM   #7188
Blu302
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Quote:
Originally Posted by scorpionreptyle View Post
2.5 engines are the most maxed out on top of its power, to feel positive effects you need a gain of at least 20 hp ,..gain that is not software achievable. 2.5 guys should focus on midrange improvements,rather than top. For top, better,higher flow is required,and that implies hardware changes.

I would believe you if my stock hardware 2.5 X3 didn't keep up with Toyota Sportivo or ZR6(V6) after only software mods.
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Old 06-21-2019, 06:34 AM   #7189
donBogi
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Any hints which way to go with vanos, especially with the b30 intake cam?


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Old 06-21-2019, 10:25 AM   #7190
scorpionreptyle
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Originally Posted by Blu302 View Post
I would believe you if my stock hardware 2.5 X3 didn't keep up with Toyota Sportivo or ZR6(V6) after only software mods.

there are lots of "192hp" BMWs that keep up and even beats cars, disregarding power/weight ratio.


With stock parts in mind,i dont see anything on the software side that can make a serious difference on top power. Vanos intake is optimised for full retard early enough, exhaust do nothing on top with stock manifold, injection will be corrected by post lambdas, ignition give minimal improvement - for some perform worse than stock. Without proper scavenging those engines wont increase their volume and wont make enough power to push you harder enough to perceive a change for "before and after".
If you find the spot of improvement for stock toys... let them try out!
..i did not spend enough time on 2.5 /2.8 to be 100% certain of what i say , i`m based mostly by the way the maps look like.
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Old 06-22-2019, 04:47 AM   #7191
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Hi Guys,

can anyone explain that dashpot stuff to me, i don't get it, i want to use the engine Brake at it's fullest strength down to around 2k Rpm, i found those two tables (descripted as "throttle daspot factor" ip_pvs_dif_neg_fac__pvs_max__n and "throttle dashpot decay factor" ip_pvs_dif_cr_neg__pvs_max__n).
How should i change values? How do they work? Should i zero them out?
I Already played a bit around with the values but there was no noticable effect, so what am i doing wrong?
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Old 06-22-2019, 04:47 AM   #7192
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double Post

Last edited by Masterchief83; 06-22-2019 at 04:48 AM. Reason: double post
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Old 06-22-2019, 07:27 AM   #7193
10le
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Quote:
Originally Posted by scorpionreptyle View Post
2.5 engines are the most maxed out on top of its power, to feel positive effects you need a gain of at least 20 hp ,..gain that is not software achievable. 2.5 guys should focus on midrange improvements,rather than top. For top, better,higher flow is required,and that implies hardware changes.
Did install headers on M54B25. At part load I have (currently) all disadvantages (increased fuel consumption, reduced torque) because of not modified VANOS- setup. But I think to see advantages at high rev and high loads.

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Old 06-22-2019, 07:48 AM   #7194
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Quote:
Originally Posted by scorpionreptyle View Post
there are lots of "192hp" BMWs that keep up and even beats cars, disregarding power/weight ratio.


With stock parts in mind,i dont see anything on the software side that can make a serious difference on top power. Vanos intake is optimised for full retard early enough, exhaust do nothing on top with stock manifold, injection will be corrected by post lambdas, ignition give minimal improvement - for some perform worse than stock. Without proper scavenging those engines wont increase their volume and wont make enough power to push you harder enough to perceive a change for "before and after".
If you find the spot of improvement for stock toys... let them try out!
..i did not spend enough time on 2.5 /2.8 to be 100% certain of what i say , i`m based mostly by the way the maps look like.

I must be doing something right as the DME(MS45.0) is reporting up to 288NM at 4700rpm and 265NM at 3000-3500rpm using Testo for logging.
Much better than the stock 245NM max it reported across the whole range.

I will post a screen shot of my cam settings soon after I have have the fuel sorted better.
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Last edited by Blu302; 06-22-2019 at 07:50 AM.
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Old 06-22-2019, 07:58 AM   #7195
10le
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Quote:
Originally Posted by Blu302 View Post
I must be doing something right as the DME(MS45.0) is reporting up to 288NM at 4700rpm and 265NM at 3000-3500rpm using Testo for logging.
Much better than the stock 245NM max it reported across the whole range.

I will post a screen shot of my cam settings soon after I have have the fuel sorted better.
Can you give me your secrets??
If I read your post, I feel like an idiot.

It is good to have someone better in the group.

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Old 06-22-2019, 09:13 AM   #7196
donBogi
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Quote:
Originally Posted by Blu302 View Post
I must be doing something right as the DME(MS45.0) is reporting up to 288NM at 4700rpm and 265NM at 3000-3500rpm using Testo for logging.
Much better than the stock 245NM max it reported across the whole range.

I will post a screen shot of my cam settings soon after I have have the fuel sorted better.


Thanks! Kind of you.
I started doing small steps through the vanos maps to check for power. The hardest part is to find time analyzing and testdriving. Now we have insane temperatures in Germany which donít really allow serious setup testing


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Old 06-22-2019, 12:14 PM   #7197
scorpionreptyle
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Quote:
Originally Posted by Blu302 View Post
I must be doing something right as the DME(MS45.0) is reporting up to 288NM at 4700rpm and 265NM at 3000-3500rpm using Testo for logging.
Much better than the stock 245NM max it reported across the whole range.

I will post a screen shot of my cam settings soon after I have have the fuel sorted better.

i think you misunderstand me. i repeat myself : B25 engines is maxed out on TOP of its powerband, there is almost nothing to do to improve performance in a manner that you can feel it (on stock form/parts). B25 guys should FOCUS ON MIDRANGE improvements.

You say you did something that contradicts me ,but you do that on midrange.

Top range i refer at, lies around peak hp range 5.7k ~ 6.5k+
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Old 06-22-2019, 12:49 PM   #7198
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My friends 2.5 is going out ( gonna do 3.0 swap) ,so we decided to blow it , just threw 6 degrees of timing eveywhere did some vanos adjustemnt , some more fuel and sent it. Since there is no gauges on the car I left 1 precat sensor to do the work I guess. And ofcourse pop exhaust cuz why not >> From exhaust pop the muffler exploaded like a bomb)))) Stock exhaust sytsem and got ebay headers on it. Right now he driving the car he says it got a lot more responsive and faster "butt dyno". So next another 4 degrees maybe ?)))
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Old 06-22-2019, 01:46 PM   #7199
10le
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Quote:
Originally Posted by donBogi View Post
Thanks! Kind of you.
I started doing small steps through the vanos maps to check for power. The hardest part is to find time analyzing and testdriving. Now we have insane temperatures in Germany which donít really allow serious setup testing


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Next German!

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Old 06-22-2019, 06:07 PM   #7200
Masterchief83
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Quote:
Originally Posted by Blu302 View Post
I must be doing something right as the DME(MS45.0) is reporting up to 288NM at 4700rpm and 265NM at 3000-3500rpm using Testo for logging.
Much better than the stock 245NM max it reported across the whole range.

I will post a screen shot of my cam settings soon after I have have the fuel sorted better.
Maybe you get some support with fuel sorting if you share the actual stand where you are, i'm open for some test runs across upcoming week and i think i am not the only one.(Could do 2 Test runs per day, 1 in colder morning and 1 at top themperature)
Regarding upcoming themperatures of around 38 degrees celsius here that could get interesting.
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