12-10-2018, 09:01 AM | #45 | ||
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12-10-2018, 09:07 AM | #46 | |
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Are you saying any high flow downpipe? Or, 200 vs 300? Or, in SeanWRT and my application of running the Dinan turbo with Sean’s BM3 map? |
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12-10-2018, 10:33 AM | #47 | |||
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I read in another thread that the 300 CEL cat flows about 80% while the 200 flows about 90% of the air. If that is true, I have two questions... 1. What CEL is the stock cat? I'm guessing 400-800 but I cant find a number. If its 400, the jump from 400 to 300 is probably not worth it. But if its 800 stock, the difference between a 200 vs 300 wont seem as much. 2. What percentage air flow is going through the stock cat? If the 300 is 80%, and the 200 is 90%... ??? |
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12-10-2018, 11:32 AM | #48 | ||||
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12-10-2018, 01:25 PM | #50 | |
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(EDIT) Maybe you're referring to going from 300 to 200? |
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12-10-2018, 01:28 PM | #51 | ||
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12-10-2018, 01:30 PM | #52 | |
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Another commenter said the same about when driving in Comfort mode. Altho, would love to hear others’ input on exhaust volume change when you’re just cruising in Comfort. |
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12-10-2018, 03:44 PM | #53 | |
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When cruising the difference is barely noticeable
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12-10-2018, 06:43 PM | #54 |
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Stock is 600 cell. 200/300 cell adds about 10+ peak hp and 15+ low down torque, flashed or not. Going from high flow to catless adds absolutely zero power at the stock/STG1 turbo power level. We tested everything with our abuse car in 2017.
After the O2 sensor that sits in the middle of downpipe, there is a second cat chamber (4' in dia) with the 300 cell, compared to the straight 3' pipe with 200 cell. 4' pipe has 77% more cross section area than 3', which is why 300 cell isn't really more restrictive. The sound difference between 200 and 300 cell is not all that much, though catless is massively louder. If 200 is too loud for you, so would be the 300. But pretty much every one I know can live with high flow mated to stock cat back. 200 cell adds power and sound with minimal loss of stock drivability. 300 cell trade a bit loudness for 100% stock and is the best value IMO.
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12-10-2018, 07:33 PM | #55 | |
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12-10-2018, 07:54 PM | #56 |
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Mike I don't think anyone outside of vendor would dyno just before and after DP. See below the thread link of a M235i owner sharing his dyno experience where he sees a 11hp gain (318whp vs 307whp) from HJS 300 cell alone on stock flash (10~12psi).
https://www.babybmw.net/forum/viewtopic.php?t=84130 My tests were purely based on 100-200kph times with our abuse car. In early 2017 that car was on FMIC/decat and JB4. The best we did on E30 is low 9s on flat 17~18psi map. Couldn't live with the smell, we switched to 200 cell but nothing changed. We even got slightly better results - occasionally broke into 8.8/8.9s. Couldn't do more ethanol because of fuel pump limit. In mid 2017, we loaded BM3 as BEF and installed WMI, trying to max out stock turbo at ~20psi (taper to 18). We did consistently mid to low 8s at around 80 IAT. Still beaten by a 140i on meth (low to flat 8s), we thought decat can help, so put it back on. But actually it was just loud and smells and don't improve power and 100-200 time at all. Till this day, that abuse car is still FBO on meth and stock turbo. We love that car. It's tuned up to 11, super urgent and ready to fight. Most importantly, it educates me well what M2 stock can do. BTW, on that setup it can barely survive one hard lap at Shanghai International Circuit (F1).
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Last edited by SeanWRT; 12-10-2018 at 08:19 PM.. |
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12-11-2018, 08:30 AM | #57 | |
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12-12-2018, 02:11 PM | #58 |
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Another happy Fabspeed sport cat customer here! I had mine installed yesterday and love it so far. Sound is much improved as is the throttle response. Haven't noticed any difference in power, but I'm sure it's there. Can't wait to test it out in nicer weather!
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12-18-2018, 01:39 PM | #59 |
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I installed the Remus DP with 200 cell HJS cat (thanks mike@x-ph.com for a terrific holiday deal). I'm running with the stock catback, and the only other mod is the Dinan Sport Tuner (soon to be replaced with BM3). First, the sound upgrade is fantastic - just a thrilling noise as it climbs in the revs under heavy throttle. Car also feels like it revs more freely and there is a small, but definitely noticeable, power bump.
Remus fitment was spot on, and power with the Sport Tuner is all I need for the street. |
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12-18-2018, 09:44 PM | #60 | |
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12-28-2018, 05:40 PM | #63 |
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Check your inbox
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12-29-2018, 03:36 PM | #65 |
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Can't speak to the fabspeed, but the Remus is definitely a quality piece (as may be expected from an established brand like Remus). Fitment was spot on. Now 750 miles since install, no cel and absolutely loving it.
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12-30-2018, 11:52 AM | #66 | ||
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For US customers its easier and cheaper to get Fabspeed European customer, its REMUS
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