08-24-2015, 07:40 AM | #155 |
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The anti-lag is definitely more aggressive in Sport+. Ultimately there is still lag present in Sport+ when going WOT from a constant speed. But even in aggressive transitions such as driving on a track, I don't feel much lag at all, and that is where is counts. The engine feels quite responsive. However, it needs to be said that the throttle response is not as sharp as it was on my previous ///Ms (E46 and E92) and the F8X responds a little less to throttle steer.
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08-24-2015, 07:43 AM | #156 | |
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I think the "engine" settings are just right, I wouldn't want Sport and Sport+ to be calibrated the same, it would defeat the purpose. IMO, the problem resides in not having a separate control for rev matching.
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08-24-2015, 07:46 AM | #157 | |
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08-24-2015, 07:58 AM | #158 | |
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Because of the longer intake piping, restriction caused by the turbo and (usually) lower compression ratio , the throttle response is less sharp on a turbocharged engine. That is what causes the soft pedal you describe. On previous M engines, with the individual throttle bodies just a few inches from the intake valves, that response is immediate. Lag is the additional delay needed to build full boost and generate the full power.
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08-24-2015, 11:05 AM | #159 | |
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08-24-2015, 11:21 AM | #160 | |
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08-24-2015, 12:08 PM | #161 | |
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Further, the length and size of the intake tract upstream of the throttle body also has an impact on throttle response. How much and by how much the total mass of air in the intake tract needs to accelerate has an impact on the response. As tidbit, the day that we will have perfectly responsive valve control systems will also signify the end of electrical starters .
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08-24-2015, 12:25 PM | #162 |
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If the next M3 will be a hybrid there is so much more options ( and complexity ) to work with the reduce lag, the electric engine used well could mean power unit response never seen before. it's going to be an exciting time, if we thought the F8X is a huge change for M , it's nothing compared to what could be coming in the next generations.
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08-24-2015, 09:06 PM | #163 | |
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08-24-2015, 09:21 PM | #164 | |
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08-28-2015, 07:34 AM | #165 |
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I am hoping that higher flow intake with bigger diameter/smooth bent charge pipes will reduce turbo lag.
Still waiting for ER to release one... |
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08-28-2015, 10:45 AM | #166 | |
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To my thinking "turbo lag" is a lag in acceleration due to build up of boost in the turbo. If you actually are monitoring the boost while pushing the accelerator pedal, measuring the time to see the boost and it turns out to be "minimal" (whatever that means, of course) then be definition isn't any lag in acceleration not dur to "turbo lag"? What am I not understanding here? |
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08-28-2015, 12:43 PM | #167 | ||
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03-08-2017, 08:52 PM | #168 |
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Im an ex 335 owner and I owned it stock and cobb stage 1 and have now moved to an M4. With the M4 there is a lag to full power coming on even in comparison to my 335, I actually wouldn't describe it as a lag more as a deliberate electronic delay of power as its a consistent delay regardless of rpm. Having owned the m4 for 3 months I have a hypothesis on this lag/delay of full power coming on.
Firstly in my opinion it's not turbo lag. It has a fixed time length about 1 second, secondly it happens at all rpms and in all modes even sport plus where I believe turbos are significantly pre spooled. Furthermore being a 335 owner this lag wasn't there that means technically if they wanted they could eliminate it in the m4. In my experience it's like a two stage power delivery and I think it's there to smooth out the power delivery and make the power behave more linearly instead of giving it one huge boost which will make the car lose traction and give it a non linear feel. Before I bought the m4 I even test drove the m6 and felt the same. When I test drove m4 and m6s initially I felt they were slower than my cob'd 335. But then I realised that the 335 was giving me 390ish horses at once resulting in huge g force and the M's do it in a more linear fashion. I love my new m4 but I tell you I miss that push back the 335 would give when floored. All the girls would squeal! Although the m4 is going faster the initial pushback and g force isn't as good as the cob'd (tuned) 335. That's my two cents worth boys. Personally I feel this forced linearity on the M4 also helps it control drifts better |
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03-09-2017, 02:26 AM | #169 | |
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03-09-2017, 07:46 PM | #170 | |
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03-09-2017, 08:19 PM | #171 |
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[QUOTE=Snappy Phoenix;21388589]when I floor my M4, there is like a 2 second lag before the thing starts going super fast so yes it is there. I don't get it how reviewers always say there is no Turbo lag. Very annoying but it is what it is I guess.[/
Is your car a manual or DCT? Also, is the lag experience in all throttle settings? I have a manual and don't feel it much at all. |
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03-09-2017, 09:18 PM | #172 |
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Or a Porsche 944 Turbo. Mash accelerator, wait for it, one thousand one, one thousand two, one thousand three, oh, there's that turbo!
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03-10-2017, 03:52 AM | #173 | |
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[QUOTE=Nicky_do_it;21392915]
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The lag is less in Sports and Sports+ but it's there. As in, the acceleration is not instant like it is with naturally aspirated engines. In comfort mode, it's horrible I can't imagine driving it in Comfort mode other than for shopping for groceries or having the baby in the back seat. |
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03-10-2017, 05:01 PM | #174 | |
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[QUOTE=Snappy Phoenix;21393988]
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03-10-2017, 06:10 PM | #175 | |
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[QUOTE=Nicky_do_it;21397290]
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The proper way to drive any car is the downshift the gear to where the rpms are at the sweet spot- around 4k in this car and THEN floor it. There should be little lag. The only real lag I have experienced driving this car is when you bounce between gears. say you are on the highway at 50 mph in 6th gear, then you drop 3 gears to 3rd anticipating a pass. The is no room so you upshift 2 gears to 5th. If i then drop it back down to 3rd, the car is momentarily laggy, even in 3rd. and wot takes an extra second to kick in.
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03-10-2017, 08:28 PM | #176 | |
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[QUOTE=dkhm3;21397644]
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