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Author Topic: vehical maf limit  (Read 1923 times)
lgtmelo
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« on: March 18, 2024, 08:05:34 AM »

hey, my MSHFMTP goes up to 2058kg/h which is 571.67g/s. im wondering whats the reading limit on bosch 079133471 maf (s5 4.2). initially i thought a 364g/s cap was due to vcds logging but i just got vehical and it shows the same value as max. is this an ECU cap?
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prj
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« Reply #1 on: March 18, 2024, 11:35:12 AM »

The real question is which value you are logging.
There is probably a single byte value and a word value.
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lgtmelo
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« Reply #2 on: March 18, 2024, 11:46:21 AM »

Group[002][4] Air mass/intake manifold pressure/air mass 2 g/s

FR says 10 mshfm_w Luftmassenfluß SY_HFM>0 g/s 25 var 0 ... 364 g/s (for med9.1, best i got)
« Last Edit: March 18, 2024, 11:48:00 AM by lgtmelo » Logged
prj
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« Reply #3 on: March 21, 2024, 11:39:11 AM »

Basic obviously has diagnostic limits.
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lgtmelo
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« Reply #4 on: March 22, 2024, 11:12:37 AM »

from what i gathered, every maf measurement block variable is capped at 364. so the only way to actually get it would be to map the actual mshfm_w address and log it directly. if i ever manage to disassemble this thing i will post something here Smiley
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IamwhoIam
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« Reply #5 on: March 22, 2024, 11:27:27 AM »

from what i gathered, every maf measurement block variable is capped at 364. so the only way to actually get it would be to map the actual mshfm_w address and log it directly. if i ever manage to disassemble this thing i will post something here Smiley

You don't need to disassemble, just pay and use VehiCAL advanced and you'll be able to log it!
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I have no logs because I have a boost gauge (makes things easier)
lgtmelo
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« Reply #6 on: March 22, 2024, 11:56:02 AM »

You don't need to disassemble, just pay and use VehiCAL advanced and you'll be able to log it!

unfortunately vehical doesnt have the advanced mode already for my ecu, so id need to mail a full read, which i also dont have.
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prj
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« Reply #7 on: March 22, 2024, 01:51:34 PM »

It does now.
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lgtmelo
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« Reply #8 on: March 22, 2024, 04:49:48 PM »

It does now.

yes sir! will look into it tomorrow. do you mind sharing the full read so that i can try to play with it in IDA?
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lgtmelo
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« Reply #9 on: March 25, 2024, 01:12:48 PM »

quick feedback, advanced mode is working beautifully, and im getting  ~17 reads/sec without patching.

sadly, it seems the problem with max maf reading was not the actual variable limitation, as even logging straight from the var in vehical, i get a max of 1313.1kg/h for mshfm_w (=364.75g/s) and 160.148 for rl_w.

any tips here? maf scaling goes up to 2058 kg/h in MSHFMTP. is it the actual maf thats limited to 1313kg/h then?
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