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      02-13-2014, 09:58 PM   #331
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Quote:
Originally Posted by Boss330 View Post
The A and CLA AMG are high HP, but BMW M said that they weren't that impressed with that engines characteristics... They would have done it differently

I haven't driven that car, but the engine is fairly low comp and supposedly has noticeable lag (since it's low comp (only 8,6:1), it makes less NA hp before turbo boost kicks in).

That 8,6:1 comp ratio is very old school compared to the 10+:1 that BMW turbo engines has. It seems like a cheap and easy way to make power just by lowering CR and adding boost. Low comp and high boost is easier to accomplish than high comp, high boost and high power... But the latter is far better when it comes to throttle response, as we have a engine that actually performs quite well also as a NA engine. A NA engine with only 8,6:1 compression isn't a very agile, responsive engine by itselves. A turbo engine with a low 8,6:1 CR requires boost to come alive. A turbo engine with a high 10+:1 CR actually makes decent power without boost as well.

The 2l AMG will perform worse off boost than a NA 2l version of the same engine, because CR is so low. A turbo engine with close to NA comp ratio, will perform much more like a NA version of the same engine off boost, as well as have more power on boost.

The S55 has a 10,2:1 CR
The S54 had a 11,5:1 CR
The S65 and N53 has a 12:1 CR

In theory, based on CR and that the S55 has DI, the S55 could actually not be to far off how a S54 behaves/feels (in the lower rev range and "off boost")

(My 1988 Cosworth 2l turbo has 8:1 comp ratio and 280hp. It's awesome when the boost comes, but very mundane off boost... Obviously not comparing a brand new AMG 2l turbo with old tech)
Keep in mind that CLA amg is a 2 liter engine making 355hp... If a 3 liter engine had the same output per liter it would make 533hp. Also keep in mind that the CLA uses 'pedestrian' fuel. By lowering compression, the engine builder is able to increase the amount of air and fuel in the combustion while remaining stoic (or wtv the tune calls for) in order to make that 177.5hp/liter.

Besides, if you are the person to buy a boost buggy, off throttle or out of boost performance is not really what you are after...
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      02-14-2014, 09:38 AM   #332
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      02-14-2014, 05:46 PM   #333
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Originally Posted by DarkAgent
OMG...not another white car! I'm on my 2nd one straight. As much as I love white. It's time for something different.

Fudge up thing is I want red intertior and white goes well with it but I can't....just can't do it again!
White in red or black on red. Omg
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      02-14-2014, 09:54 PM   #334
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Only BMW can master the colour Alpine White IMO... Alpine white on other brands just look cheap on most circumstances. Name it, Audi, Merc, even Aston Martin...
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      02-15-2014, 08:40 AM   #335
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      02-16-2014, 08:36 PM   #336
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      02-28-2014, 09:10 AM   #337
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Jeez...after watching this video again it has me wanting to switch over to a M4. I know, 1st world problems....
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      03-12-2014, 05:11 PM   #338
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I'm in on the white as well,very nice....
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