03-19-2020, 12:28 PM | #1 |
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F90 secondary downpipes gains
According to the fabspeed dyno graphs, the secondary cat bypass adds 50 hp to the wheels on F90 and does not require a tune, since secondaries do not have O2 sensors in them. How true is that? Seems like a crazy gain from just a secondaries delete... I had an impression that such power increase is only possible with primary cat delete??
https://www.fabspeed.com/bmw-m5-f90-...-bypass-pipes/ |
03-19-2020, 01:02 PM | #2 |
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03-19-2020, 04:18 PM | #3 |
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At first, thought so too. But it’s a pretty reputable manufacturer, supplying parts for exotic cars and Porsches. Don’t think they would fake the dyno results. Another thing I noticed is that factory cats in primary downpipes vs race cats are just 10 hp difference according to their dyno.
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03-19-2020, 04:35 PM | #4 | |
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05-03-2021, 11:43 PM | #5 |
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I think it's bs! 50 hp no way. Maybe 7hp. The f90 secondary cats flow is not as restricted as some. I was reading a different thread with a flow bench test. Quoted from post:
F90 Factory second cat flows 542cfm at 28 H20 For reference an open 2.5" pipe flows 515cfm An open 3" pipe maxes my bench at 702cfm 2017 Z06 secondary @ 482cfm He said the Z06 gained 35 horse, 18 at the wheels by deleting ALL 4 cats! He said in comparison the F90 on a 3" secondary 21hp at the crank. We are just talking secondary, not all 4 cats. 50 hp lol! Maybe 4whp. The F90 secondary cats are tiny compared to the Z06's. https://f90.bimmerpost.com/forums/sh....php?t=1551285 Last edited by ruderegime; 05-03-2021 at 11:55 PM.. |
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05-04-2021, 02:37 PM | #6 |
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2 cars running exact same tune. 1 has full downpipes removed, other has only upper dp removed.
Difference 100-200 dragy is 0.15-0.2. Measured 10x times. So answer is definitive NO, it does not add 50hp. |
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05-04-2021, 07:35 PM | #8 |
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05-05-2021, 12:46 AM | #10 |
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05-05-2021, 08:25 AM | #11 |
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hilarious.
Idk whats better, calming 50whp gain or paying $1600 for two metal pipes
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05-05-2021, 03:01 PM | #12 | |
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Last edited by boost4breakfast; 05-05-2021 at 03:08 PM.. |
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05-06-2021, 09:24 PM | #13 |
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