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Old 06-14-2019, 08:19 PM   #1
DbeauE46
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Turbo m54B25 MS45.1 tuning questions

has anyone had experience tuning ms45.1? im using Renovelo software and had a few questions regarding some engine parameters. I would really appreciate someones wisdom cheers boys
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Old 06-16-2019, 08:48 AM   #2
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I've messed with it a bit, but not for a turbo application. I'm running the ESS twin screw kit and had to tune it myself because the tune from ESS was a hack job.
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Old 06-16-2019, 09:10 AM   #3
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Convert it to ms43

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Old 06-16-2019, 11:47 AM   #4
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I've messed with it a bit, but not for a turbo application. I'm running the ESS twin screw kit and had to tune it myself because the tune from ESS was a hack job.

do you recall which map/maps you changed to add fuel?
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Old 06-20-2019, 09:57 AM   #5
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I adjusted fuel load fueling: ip_lamb_fl__n
And cold start correction: ip_fac_ti_tco_wup

I really didn't adjust the part load fueling much at all. My strategy involved telling the DME how much air was coming in (accurately), and letting it decide how much fuel to provide. So I did not rescale the MAF and thus didn't have to overhaul the fueling tables to compensate. For cars making about 330whp like mine, that's probably ok. But if you start to pull any more air than I am at this point then you'll have no choice but to start scaling the MAF and diving deeper into the fueling tables, because on my car I'm just maxing the MAF at like 6k RPM, right at the top.

EDIT: I should point out I did rescale the fuel injector sizing and their delays since I installed larger injectors, as that is also critical for this strategy to work right: c_ti_as, c_ti_min, c_ti_add_dly
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Old 06-20-2019, 08:48 PM   #6
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Yeah just convert. I did. Never regret it
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Old 06-20-2019, 09:24 PM   #7
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Yeah just convert. I did. Never regret it
Was going ms43 really that much easier to tune?
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Old 06-21-2019, 10:21 AM   #8
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Yes
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Old 06-21-2019, 11:30 AM   #9
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I'd like to know in what way.

If you don't have maps for MS45.1, but you do for MS43, then of course MS43 is easier to tune.

If you have the maps and can't tune MS45.1 then you can't tune the newer gen DME's either, because MS45.1 was a stepping stone to the modern stuff which has about twice as many tables/parameters as the MS45.1
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