07-01-2020, 10:32 AM | #23 | |
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i.e. 320i 184hp to 300hp, 330i 258hp to 300hp Interneal comparments and turbos are the same. |
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10-31-2021, 02:58 AM | #24 |
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10-31-2021, 01:43 PM | #25 | ||
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11-17-2021, 05:59 AM | #26 |
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11-17-2021, 08:03 AM | #27 |
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Look up the 320i compression ratio and then compare that to the 330i. I've asked tuners about this. They do not tune 320's to the same level as the 330 due to this.
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11-21-2021, 08:28 AM | #28 | |
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In the B series engines (b46, b48) it's a bit complicated because the 20i had multiple different engines. B48B20A (used ONLY in 20i and in SOME 30e hybrid setups) B48B20B (used in 20i AND 30i identical hardware with different software tune) The B48B20A has different hardware to the 20B and yes compression ratio is ONE of the things which sets the 20B and 20A apart. If you have a 20i with a B48B20B engine, you CAN safely tune it in the same way as the 30i (with caveats) from a hardware perspective. The caveat being, if you use JB4/Racechip, you're going to be "knee capped" by certain settings in the 20i software tune which create a lot of trouble i.e AFR never targeting anything other than stoichemetric & hardcoded throttle closures (I know this because this is what I ran into). If you have a 20i with a B48B20B and do a flash tune (BM3, MHD, Ecutek, etc.) you can unlock it's full capability by freeing up DME to target lower AFR which give you better timing and for all intents and purposes becomes identical to a tuned 30i. If you have a 20i or 30e with a B48B20A unfortunately there's much lower headroom in what you can do because of the compression ratio and difference in other hardware around/in the engine. |
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11-21-2021, 08:34 AM | #29 |
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it's clear why this is done
It's a cost cutting measure, why have another engine with different parts when you can use the same engine across multiple models (20i & 30i) with simply software change. The modular design already cuts a LOT of cost but going one step further to combine 20i & 30i engines makes a LOT of sense given the 20i isn't even available as a trim level in some regions (there is no 320i in the united states as far as I know). |
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11-25-2021, 06:27 AM | #30 | |
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11-25-2021, 07:27 PM | #31 | |
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Imagine you build one car say the 30i and you discover via focus groups or whatever that you can get more sales without cannibalizing existing sales by simply making a less powerful model for cheaper. You can (1) design entirely new parts for this cheaper model, potentially saving a bit on manufacturing costs because lower quality thresholds or materials or (2) change a bit of code because everything is digital now. All you have to do is lower target boost pressure and change some AFR map figures.... That's about it. Remember with new designs and parts comes costs relating to design and testing, that doesn't really apply to software detuning. If you make a part that can withstands 300hp by definition it can handle 200hp. You can see the part numbers on all those things you mentioned are the same. I'm not talking about on bimmercat (even though this is good enough for me) because you might have a ton foil hat on. I'm taking about lifting the hood and physically checking the parts. Between every single B48B20B I've seen the parts are identical regardless of whether the model was 20i 30i or 30e. Only the software / ecu behavior differed |
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02-23-2023, 08:26 AM | #33 | |
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Hello, and sorry for bringing such an old post back, but it seems that you have knowledge, and know how to find information. So i was wondering if I find a 330e with a B48B20B(the engine on 330i), is there any other difference between the engine on 330i and 330e, like pistons or something else, or is it purely software limited to 184hp? |
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02-24-2023, 01:48 AM | #34 | |
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03-10-2023, 01:43 AM | #35 |
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If you get one with the B engine there are no differences at all and they can be tuned reliably to 300hp (404 on the 330e with the electric engine in Xtraboost mode) like the 330i.
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08-24-2023, 11:24 PM | #36 | |
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Tuners say they can take the 300 hp out but its not safe. When i chekced the engine bay it shows "B48B20" but realoem shows using vin numbers "b48d" so i think its the GPF model that cannot safely be tuned like the other b48b20 types. |
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08-25-2023, 02:13 AM | #37 | |
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08-26-2023, 08:00 AM | #38 | |
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I re-checked and in engine is B48B20B. Can i know somehow that my car has the GPF or not? Because on those GPF models tuning power is limited. |
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08-29-2023, 01:33 AM | #39 | |
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320i G20 GPF ..so EU version. Tuners say 220 hp / 370 nm limited torque Some say 260 hp / 420 nm..and like MGflasher 310 hp / 430 nm.. But no one clearly says why some limit the torque and top end power .pistons? Mgflasher says no problems with their power level..damn hard to find truthfull information. |
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