02-16-2024, 04:51 AM | #244 | |
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Do you think there is a problem? Is it the amount of air that enters the engine? |
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02-16-2024, 05:42 AM | #245 |
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02-16-2024, 06:55 AM | #246 | |
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You can change the selection in MHD, tuner isn't needed. |
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02-16-2024, 07:14 AM | #247 |
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Don't buy the cheapo tmaps they're junk imo. Get a good quality OE sensor, doesn't have to be genuine bmw OE is fine.
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02-16-2024, 07:24 AM | #248 |
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Ray, not to nitpick but im positive 22.5 is the max. When reading logs; the mani map stops at 22.5 while the other map keeps reading above that.
He’s gor a custom tune^..So i have to assume some scaling will need to be done for the new map, plus that dip at 5k needs to be fixed..Should stay on an upward trend. |
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02-16-2024, 10:19 AM | #249 | |
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02-16-2024, 11:51 AM | #251 | |
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02-16-2024, 12:09 PM | #252 |
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Missed this. It could be, most recommend a bigger intake over 500wheel. Looking at logs would help determine though. do you use mhd/bm3?
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02-16-2024, 01:16 PM | #253 | |
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So if the max is actually 36.3 psia (I don't know if it is), at sea level with 14.7 psia ambient pressure, the max boost pressure it could read would be 21.6 psig. This number would increase with higher elevation. And it would also vary depending on what the actual maximum absolute pressure is that it can read (I don't know what the actual number is). At least that's my current understanding, I could be mistaken. |
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02-18-2024, 04:35 AM | #255 |
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Been wondering this myself. Since I have 6MT vs. DCT it seems it gives me a bit of a benefit, but that doesn't mean I am safe. Was thinking about the CBC device especially since my car generally lives in the higher RPMs. I'd rather not chance it. N55s seem less prone to it than S55s. Hopefully we get some good responses here that can help us make a decision and be comfortable with it.
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02-18-2024, 08:47 AM | #256 |
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This gets discussed a lot over on f80post, as it seems to be a bigger issue for s55's. Unfortunately, there are a lot of differing theories and opinions, so it may be best to research and decide for your self if you think the risk is worth the upgrade, and if you think the upgrade will help reduce the risk.
Here are some related links you may find useful. https://f80.bimmerpost.com/forums/sh....php?t=2077941 https://f80.bimmerpost.com/forums/sh....php?t=1226184 https://f80.bimmerpost.com/forums/sh....php?t=1560274 |
02-18-2024, 08:54 AM | #257 |
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Personally, I believe it's less on an issue for n54 and n55 than s55 (s55's crankhub has more rotating mass to turn than n54 or n55). I also think the issue may be variability in the friction disks, which could potentially be exacerbated by higher power level.
If I were to do any crank hub mods for my car, I'd skip the CBC as I don't believe it does anything. For my car, I'll probably either stay on stock hub, or potentially upgrade to the newer BMW version with larger friction disks. Edit: I'll also continue to use kick-down on my 6hp trans with xHP tune, and never lug my engine at low rpms. |
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02-18-2024, 09:33 AM | #258 |
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This is the S52 harmonics all over again. Likely the crank hub issue could be crank and block harmonics, due to them being stiffer. Could also be the higher redline (like it was in the S52B32 days)
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02-18-2024, 09:34 AM | #259 | |
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02-18-2024, 10:43 AM | #260 | |
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Edit: same for everybody else with boost getting clipped off, if you had ambient pressure logged it would be intersting to see if we calculate the same max tmap value by subtracting ambient from the clipped off boost value. |
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02-19-2024, 05:09 AM | #261 | |
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02-19-2024, 12:01 PM | #262 | |
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02-19-2024, 05:00 PM | #263 | |
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Credit: Payam@BMS So judging by the measurements posted on here about the other inlets, BMS is the largest.
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02-19-2024, 05:13 PM | #264 |
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21.7 psi boost + 14.75psi ambient = 36.45 max absolute pressure (2.513 bar). That's a pretty high ambient, do you know your elevation? Oh, I see Florida, guessing very low elevation.
Does anybody else on stock tmap have any logs with clipped boost and ambient pressure logged? |
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