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04-06-2017, 02:02 PM | #2 |
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If catless, yes you're reducing restriction of flow through the immediate hot side exit of the turbo.. but that CEL counters that unless you use some sort of DP fix(BMS products). Same applies for some downpipes with catalytic converters.
Do it right and you'll get some gains in hp/tq. Plenty of threads around here on the topic.
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04-07-2017, 10:15 AM | #3 |
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I'd go with a tuner product (JB4, MHD, Cobb) at the same time to take full advantage of the DP upgrade and avoid CEL. All depends on what your overall goals are for the car and other mods you have planned. What have you done to the car? What else do you have planned?
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2011 BMW 135i M Sport Space Grey - BMS JB4, VRSF 3.5" catless DP, Berk exhaust, BMS intake, ER CP, Eibach Pro-Kit, H&R spacers, black kidneys, Blacklines, LUX angel eyes
2014 BMW X5 xDrive 35d M Sport Mineral White - MPBK w/ F85 rotors & Carbotech pads, ACS Springs/Links, iND reflector deletes, iND black roundels, MP black kidneys, M50D grille inserts 2007 Suzuki GSX-R 750 - too much to list |
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04-07-2017, 04:42 PM | #4 |
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I data logged the results of my N54 catless downpipe install. These tests were all run in 3rd gear, with ambient outside temp around 70 degrees, and engine fully warm. Each test was done from a full coasting fuel cut condition, meaning the turbos had no load and minimal shaft speed in order to maximize lag time. I had a Cobb stage 1 tune.
I am high altitude with 100k miles, your results might be different. I honestly didn't "feel" much of a difference, I would get a tune first. Stock downpipe results: 1000rpm start 6 psi time: 3.841s @ 2201rpm 12psi time: 5.194s @ 2798rpm 3000rpm start 6 psi time: 0.755s @ 3222rpm 12psi time: 1.200s @ 3415rpm 5000rpm start 6 psi time: 0.354s @ 5099rpm 12psi time: 0.655s @ 5275rpm Catless downpipe results: 1000rpm start 6 psi time: 3.090s @ 1977rpm 12psi time: 4.150s @ 2500rpm 3000rpm start 6 psi time: 0.650s @ 3218rpm 12psi time: 0.959s @ 3356rpm 5000rpm start 6 psi time: 0.301s @ 5159rpm 12psi time: 0.555s @ 5265rpm |
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04-08-2017, 09:20 AM | #5 | |
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Quote:
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04-08-2017, 10:00 AM | #6 |
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Won't get much out of the K&N Filter, the stock intake box is just to restrictive once tuned- consider a different Intake. Cheapest intake is the BMS DCI. I prefer to recommend the AFE Momentum GT but it's not a budget friendly intake but is the better performing of the intake options.
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04-10-2017, 12:13 PM | #7 |
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You'll need the JB4 or a alternative tune to take advantage of the DP and defeat the CEL.
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2011 BMW 135i M Sport Space Grey - BMS JB4, VRSF 3.5" catless DP, Berk exhaust, BMS intake, ER CP, Eibach Pro-Kit, H&R spacers, black kidneys, Blacklines, LUX angel eyes
2014 BMW X5 xDrive 35d M Sport Mineral White - MPBK w/ F85 rotors & Carbotech pads, ACS Springs/Links, iND reflector deletes, iND black roundels, MP black kidneys, M50D grille inserts 2007 Suzuki GSX-R 750 - too much to list |
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