10-04-2019, 06:46 PM | #1 |
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hi so after recently blowing my piston rings in cylinder 3 I've taken the plunge into forged pistons. my question is I've gone from the high compression 320i piston at 11:1 cp ratio, to Carrillo 9.5:1 compression, will the OTS bm3 maps still work without any issues?
other engine mods mst inlet/intake decat charge pipes dv+ arp rod bolts thanks
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forged pistons 9.5:1
arp rod bolts mst inlet/intake dv bm3 stage 2 decat ftp charge pipes |
10-05-2019, 03:33 PM | #2 |
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I would definitely talk to a tuner about that. Changing the compression ratio is a pretty substantial modification that I would assume should be tuned for.
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10-09-2019, 07:29 PM | #3 | |
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10-10-2019, 11:48 AM | #4 | |
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Maybe. Not recommended. Call up BM3 about a custom tune if you are going there. I wouldn't, even stock it would probably be a nightmare. Is this them or just a "shop"? Seems like them: BM3 Tuning NYC/NJ 639 East 31st Paterson,NJ Call/Text: 646.907.9439 or or (862) 823-2370 | 2890 Shell Road, Brooklyn NY |
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10-10-2019, 11:49 AM | #5 |
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10-10-2019, 12:17 PM | #6 | |
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Just saying |
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10-10-2019, 12:32 PM | #7 |
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10-16-2019, 08:08 AM | #8 |
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A compression of 9.5:1 will require considerably more timing and or boost/cfm to make the same hp as an 11:1 compression ratio (all other things equal). I wouldn't even think of doing this upgrade with out a much larger turbo that can support more more boost and cfm, rods as strong as the Pistons, sleeves as strong as the rods/ pistons and an auxiliary port fuel injection that could keep up.
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10-16-2019, 09:13 PM | #9 | |
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10-21-2019, 02:41 PM | #10 |
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Def stick with 10:1 compression and get the rods while you are there. No sense in doing just pistons.... Rods are weak link with this engine above 360 Wheel Torque. If you just do the rods and pistons you can run about 450-500 HP safely with the open deck on supportive turbo and fueling upgrades.
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2012 F30: G25-660 Bottom Mount Mani+ DP+ Intake, CSF FMIC, VRSF CP, Walbro 450 LPFP, PR Injection with AIC 4, S63TU Injectors, Tuned with BM3, ZF Race 4 Puck and Non SSA Pressure plate, Catless, 3.5" Quad Muffler, Custom Valved Bilstein B8 + H&R SS. Max 456 WHP - 452 WTRQ. Currently tuned down to 434 WHP and 362 WTRQ to save the rods.
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