Everything About the 45 AMG, *official Document* - Page 2 - Mercedes CLA Forum

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post #11 of 32 Old 04-15-2013, 10:24 AM
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Key figures at a glance:

Displacement
1,991 cc

Bore x stroke 83.0 x 92.0 mm

Compression ratio
8.6 : 1

Rated power output (U.S.)
355 hp at 6,000 rpm

Peak torque (U.S.)
332 lb.-ft. at 2,250-5,000 rpm


Engine weight (dry) 326 lbs.

Maximum engine speed 6,700 rpm

Power density 178 hp per liter

Maximum boost pressure 26.1 psi (1.8 bar)

Acceleration 0-60 mph km/h 4.5s (est)

Top speed 155 mph (electronically limited)
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post #12 of 32 Old 04-17-2013, 03:58 PM
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Pretty impressive numbers from a four cylinder from factory. I think it makes most of its power from the turbo. But I'm guessing for the size of the turbo it needs a higher psi to generate that much horsepower and quicker acceleration from the bottom up.
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post #13 of 32 Old 04-18-2013, 10:49 AM
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I wonder if there will be noticeable turbo lag in the 45 AMG model. They are running a small turbo to assist with the lag.

4 cylinder engines with turbochargers I find have noticeable lag.
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post #14 of 32 Old 04-18-2013, 07:01 PM
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Quote:
Originally Posted by AMG4Matic View Post
I wonder if there will be noticeable turbo lag in the 45 AMG model. They are running a small turbo to assist with the lag.

4 cylinder engines with turbochargers I find have noticeable lag.
That could be the case but I heard a little different. to avoid lag it is the most important to choose the right size turbo to pair with the engine.
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post #15 of 32 Old 04-18-2013, 07:05 PM
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Originally Posted by cfrp View Post
26.1 psi of boost is no joke. Most engines would explode from that kind of boost. Too bad only the AMG model has that exhaust butterfly valve. Would have been nice ot have on the regular CLA.
Very true usually with smaller displacement engine they would need to run a high amount of psi to get good power feedback and the turbo is important as well. But a 2.0L? i just hope the engine has enough reinforcing to take all that pressure.
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post #16 of 32 Old 04-19-2013, 12:28 AM
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Talking about turbo lag, does Mercedes have a history of having turbo lag?

So far from what im seeing, it seems as if Mercedes over built the engine, but is tuning it to be good enough. I guess a good place to start to assume if there will be turbo lag is how much PSI is actually being used. Usually low output turbo's that help to do what a V6 can and no more, are quite lag free. It's just high performance applications that get it.
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post #17 of 32 Old 04-19-2013, 08:40 AM
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I guess we'll know about turbo lag (or lack of) once it becomes available to the automotive journalists like Edmunds, Auto Week, C&D, etc. The engine block is sand cast so it will be pretty strong.
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post #18 of 32 Old 04-19-2013, 04:14 PM
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I guess we'll know about turbo lag (or lack of) once it becomes available to the automotive journalists like Edmunds, Auto Week, C&D, etc. The engine block is sand cast so it will be pretty strong.
Whats a sand cast block? Has Mercedes been using "sand cast" blocks for a while now?

I'm curious how strong the engine block is, cause I know eventually tuners will want to add bigger turbos and just crank out more power. Hopefully it's a really strong block that can handle a ton of power.
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post #19 of 32 Old 05-23-2013, 12:31 PM
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Ummm, I don't see anything in there about MPG yet
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post #20 of 32 Old 05-23-2013, 06:10 PM
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Ummm, I don't see anything in there about MPG yet
33.6 mpg
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