08-23-2023, 11:02 AM | #23 | |
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You are replacing the downpipes with higher flow ones, but it's making less power, even with CEL not being on. If it's not sensing anything wrong, why is the car making less power with higher flow downpipes?
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08-23-2023, 11:03 AM | #24 |
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This is my dyno test result on F15 X5 sDrive35i with and without DP.
Same everything but the dp. It shows gain.
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08-23-2023, 11:05 AM | #25 | |
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08-23-2023, 11:06 AM | #26 | |
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Which is what makes the new chassis results even more baffling
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08-23-2023, 11:07 AM | #27 | |
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Or even an O2 spacer since it tricks the DME into thinking it's running between the correct parameters?
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08-23-2023, 11:09 AM | #28 | ||
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The Jb4 does not automatically clear the codes, so if it's on map 0, its turned off, and the car is 100% running stock settings. Quote:
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08-23-2023, 11:13 AM | #29 | |
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All I do just helping out Evolution Racewerks, since I have the car and been friend with them.
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08-23-2023, 11:20 AM | #30 | |
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Only when stock cat back-on, car feels alive again.
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08-23-2023, 11:50 AM | #31 |
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BMW may have expanded the Lambda closed loop operation or perhaps eliminated open loop operation all together on the S58. The post-cat sensor is a narrow band one (deduced from the fact it is a 4-wire sensor), the pre-cat is a wide band (5-wire) sensor.
If closed loop Lambda operation incorporates both pre and post-cat sensors, then lack of a cat would cause the post-cat sensor under high engine loads to oscillate around stoichiometric output AFR at a higher input AFR than anticipated due to lack of oxidation of the exhaust stream that the cat would provide. Lambda feedback would then increase AFR at the pre-cat sensor too and likely either cause the knock sensor to pull timing or just revert to a lower timing on the ignition map due to a higher AFR for the load on the fuel map. The engine is probably then just operating at sub-optimal AFR and ignition values and producing less power. |
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08-23-2023, 11:03 PM | #33 |
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I tried both Wagner and Fabspeed catted downpipes on my OG F87. Loved the Wagner, but it did throw codes occasionally. Switched to Fabspeed and it has been fantastic. Great sound, spools quicker, and zero codes in 2+ years.
Got it from Mike, at Xtreme Powerhouse. More recently I added a Bootmod3 tune, and it is incredible, especially in Sport+. HIGHLY recommend one. |
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08-24-2023, 10:44 AM | #34 | |
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08-24-2023, 12:29 PM | #35 | |
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RG dyno was on stock vs. catless; we do not sell catless.
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08-27-2023, 12:24 PM | #36 | |
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Why is that "lol"? When you join the forum 3 months ago, and immediately start attacking both long time vendors and long time members, maybe it's time to take a step back and re-evaluate your approach. |
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09-08-2023, 10:58 PM | #37 | |
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09-10-2023, 12:55 AM | #38 |
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I have sport cats on my G87.
Get the occasional CEL. No performance impact or limp mode, car drives normally. Clear the CEL to kill the dash light. |
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09-11-2023, 11:16 AM | #39 |
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09-11-2023, 02:07 PM | #40 |
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Euro 5 will still trigger the check engine light
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09-11-2023, 02:37 PM | #41 |
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Technically it should but we have a customer in the g8x m3 threads with about 2 weeks and no cel. Keeping an eye on it.
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12-13-2023, 05:38 AM | #42 | |
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It's been three months since anyone last posted in this thread. Did the customer with your downpipes end up getting a check engine light? I'm potentially considering a sport cat + midpipe setup because I want to increase sound without causing a check engine light, but the dyno chart showing that using non-oem downpipes causing power loss is kind of making me apprehensive as I don't plan on tuning my car anytime soon. Looking forward to your response, thanks!
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12-14-2023, 09:47 AM | #43 | |
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12-14-2023, 10:43 AM | #44 |
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O2 spacers have always been known to cause cars to run lean, not just this one.
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