Well a stock SL32/SRT6 territory....

Two figures show that the A 45 AMG holds pole position in its displacement segment: the newly developed AMG 2.0-liter turbo engine is the most powerful series production four-cylinder turbo engine in the world. A maximum output of 265 kW
(360 hp) and up to 450 Newton meters of torque are unmatched by any other
mass-produced turbocharged four-cylinder engine worldwide. The power density of 133 kW (181 hp) is also absolutely unrivalled. In this discipline, the new AMG
high-performance turbo engine even outstrips the most powerful super sports cars

Mercedes-Benz Australia - Facts & Figures - A 45 AMG

Note - 26psi of boost.....
but with the caveat of...

To squeeze this much power out of a 2.0-liter four-cylinder, AMG equips it with a high-pressure turbocharger pumping a race-car-like 26 psi of boost. Special bearings and solid pistons handle high internal pressures akin to those found in a diesel engine. Moers claims this souped-up 2.0-liter is as durable as any other AMG engine, undergoing the same rigorous testing regimen as any other Mercedes product
http://www.caranddriver.com/reviews/...st-ride-review

Now I'd like to see the intercooler on that!

And just see how they have addressed the "lag" problem with only one TC instead of 2.

 

In to our territory? (SRT) lol try past it. all wheel drive 353hp 332 ft-lbs weighing in at 3100 lbs... A mildly modded SRT against it would be interesting but stock to stock I don't think it would play out in the SRT's favor.

 

aren't there 500+ HP 4G63's running around out there? I mean I can appreciate a factory car having that kind of power but there are definitely some crazy 4 bangers around

 

They are talking from the factory, but the evo fq400 that was only available in Europe had more hp though. It was 405hp out of a 2.0L and it was from the factory, so I dont know what exactly they are basing the info on...

 

Why not consider a CLA instead?

 

The CLA is what we are getting here in the states

 

Yes sir, I am excited! The only downside is there doesnt seem to be much room for improvement without a turbo replacement. Running 1.5 bar on the stock turbo will run it out of its efficiency range really quick with bolt-ons, a tune and any amount of raised boost levels/air flow.

 

I agree for the most part but if they restricted the Exhaust or intake side of things at all... It could see massive amounts of gain running that much boost depending on the restriction. FI takes great to mods, it just depends how it comes from the factory, and Mercedes is great at engineering but at the same time though, Merc has always been on the conservative side of things.

 

I definitely see a huge performance potential in the CLA...

I mean, look at the gains with the V8 TT platform... Alpha Motorsports (AMS) gained a crazy amount of HP from a simple tune. When you add bigger downpipes + tune, the numbers get silly real quick.

I'm excited to see what they do with it.

 

Yes but most only last a few runs down the strip before spewing parts or fluids LOL I don't think a Mercees AMG owner wants that find of reliability. 26psi in a factory tuned car is pretty wild, especially sicne they put a 4 year 50K mile warranty on it

 

Is that "free of charge" servicing for the first 4years?....'cause there'd be a few company car red liners who'd cost 'em a bomb.

 

some numbers.....(from my model)
going from atmospheric to 26psi = 56kW (191k BTU/hr) of added enthalpy to the stream at 120C (247F)...HOT!
(20C 68F ambient)
You need to bring that down to an IAT of 50C (122F) or IC off about 38kW (130k BTU/hr)
Yes - that only leaves 18kW of compression energy
Now I'm not sure where they measure their boost - but it would have to be "pre IC" 'cause though a front mounted air/air IC and piping - you get quite a bit of dP just due to the drop in temp. We see this in our SLK230's.
To achieve 26psi at 50C (122F) IAT - would be right out there.

From an SC at 65% eff. for 56kW added to the air stream = 86kW required from the crank - OUCH
BTW such boost from our cars would be equivalent to a 60mm SC pulley on an ASP 178 .....for those who choose to venture into territory no man has gone before....."Feel lucky punk"!
You'd have to be pretty sure on your SC bearing loads though.....;>)
BTW - SC pressure is a little more forgiving in that I suspect since the path between SC and MAP is so short the loss in compression due to the temperature drop through the IC would be marginal - whereas in an external air/air (2BConfirmed) the drops maybe quite significant....unknown

However - "as we say sometimes" - not to put the "Kybosh" on the adventurers out there....to pull 38kW (130kBTU/phr) out of your AIT's would be no mean feat.
We have trouble pulling 15kW (50k BTU/hr) even with a Supercooler.
But I think with post compression T's of 120C (247F) you'd get some pretty quick dissipation from your IC. "Where it goes - nobody knows"...into the condenser/radiator path?....another design issue.....

Regardless though
pulling the 56kW/eff from the exhaust stream kinetics rather than 86kW from the crank is of course where these babies (and all turbos FTM) get their advantage.

I just wanna know 2 things
1) how big the IC is and confirm if they have only air/air or include an air/water circuit. Couldnt find anything. But there would be some learnings here for us.
2) second....is there anything really insane in their piston compression design that would exclude us taking our psi up into these stratospheric diesel oriented levels.

 

If you knew anything about Evo's and 4G63s you would not be saying that. 4G63 is an amazing engine that's been around forever capable of easily handling north of 400whp. There are Evo VIII/IXs running 10's on stock turbos! Mercedes is finally doing it right, just shows you that turbo's are far superior to parasitic superchargers . Stock Evo IX has hit 12.8 in 1/4 mile and with bolt ons will put out more whp than our SRT with all the bolt-ons from a 2L four banger. Evo IX - tune, manual boost controller, turbo back exhaust = 350+ whp. I'm curious to see if the 2L mercedes has any tuning potential, I'm sure it would benefit from a 3" turbo back exhaust and possibly an intake, also we need to get a dyno baseline to see how it stacks up against our cars.

 

You touched on the biggest gain right there... These cars are using DI. -And that changes the whole game.

True, the 4g63/4 are great engines, but I can assure you they'll be working harder for the same numbers you get from the AMG 2.0L (see my reply above). So the service interval as compared between the Mitsu and Merc will likely be night and day.

That is, so long as Mercedes learned from BMW's HPFP failures in the N54.

 

I'm guessing is Direct Injection....?

 

Yes sir.....

 

Well 360hp from the new 2.0L AMG so maybe 310whp with a bit under 15% loss, 4g63 will get there with much less boost and they can run like that forever. Now I'd be a bit sketched out to say the least by the Mercedes offering.. a 4 cylinder running @ 27psi?! that's completely uncharted territory, brand new engine, parts.. no thank you.. I smell recalls coming in the near future.. just like BMW couldn't even get it right with a V6 boosting a modest 8.7psi.

 

That would be the I6. And their issue was the HPFP (high pressure fuel pump), which was corrected in later models.

With traditional fuel injection in mind I agree with you regarding the high boost pressure.

However, modern gas engines are setup like diesels, meaning they have a relatively high native compression ratio with boost added on top (direct Injection).

Have a look into the forthcoming Fiat sports cars. They are slated to run nearly 1 bar of pressure, stock.

The landscape of das auto is changing my friend.

As for drivetrain loss, I generally use 18.5%.

 

A couple more "tid bits"...
source unknown.....
".........
forged crankshaft
forged pistons
low friction rings
piezo injectors
multiple spark ignition
all aluminium crank case
new connecting rods
reworked cylinder head
sodium valves
iron protein coated cylinder liners "nanoslide"
water/air intercooler for intake charge
They get 355hp from 2 liters, Over 10 years ago Nismo would take a stock RB 2.6 liter 6 cylinder, and return it to the customer producing 450hp and boosted to 21psi – a similar hp per liter. So this unit is probably not really fragile, given the superior materials in use today
....."

the key I wanted to point out here is the A/Water IC.
Will do some more searching on their componentry design to see if there are many "real" trech advances in this (IC) and the piston/crank design.

and here....(click)
A dual stage air to water intercooler ensures low intake air temperatures, a necessity running at such high boost levels. The setup comes from the SLS AMG, which features 2 watercoolers connected in series, a smaller cooler used at low speed, and the larger cooler in the wheel arch kicks in for high speed efficiency.

 

Gotta ask yourself - 400bhp ex a 2.0L.....
Eurocharged make gains....
A45 / CLA45 : Eurocharged Performance Engine Software - A45/CLA45

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