JoaoMerc

Hey there, I wanted to know your thoughts regarding this engine? I have read that this engine was properly prepared and tested by AMG, internals and forged and reinforced and the engine is almost to the point of motor racing.

But still 26 psi on a turbo for a road car is something that makes us think. Obviously we have to take certain precautions, but what reliably can we expect from this engine?

jamesyot

Im sure its much more reliable than a v12 bi turbo lol. This is suppose to be the best 4 cylinder production engine ever. With a bunch of options this thing is almost 70 thousand. 70 thousand for a FOUR cylinder damn I hope its reliable lol.

msheredy

Remember you're not going to be pushing the 26#s every second of every mile. As long as you change the oil regularly and, in my opinion, make sure you get the engine and trans up to operating temps before hammering down on it this should be a reliable little bugger.

Girard@ACGautomotive

Had mine for a month now... It still starts every morning. More reliable than my other cars.

JoaoMerc

Thank you all for your responses. Now another topic (off-topic...) that worries ''me'' is the optional AMG Performance Suspension, is it really too hard to live with? It will be not a trackday car but of course there will be opportunity to pull the power in some nice B-roads, but it's really worth?? In addition to this, the configuration will be with the 19'' rims and AMG performance seats. Should be an extra to discard or to go for?

jamesyot

The stock suspension is very nice. The stock 18 inch rims are very nice and the stock seats are very nice. If you got money to blow then go ahead and order the upgraded stuff. I think its funny that all these people think these extras make or break the car. All I got was the performance exhaust, steering wheel, center caps, and the multi media. People drool over my car on the daily.

ML63 AMG

26psi is momentary peak boost. Most of the time ECU is probably running 20-22psi if I had to take a guess. They have torque limiters too in the ECU (which lowers boost of course).

The motor is not what I would be worried about, it's the transmission and the PTU power splitter. They are not designed to take stupid power. I bet 450-460 is all they can take before you start running into issues

Exotic-metal55

Should be very reliable and I of course would have no issues going 30 PSI

jamesyot

I like this guy. He is way cooler than all the peeps that like 26psi omg soo crazy omg omg no more boost waaa waaa lol

Flipstylephoto

In regards to the sport suspension, I wouldnt' say it's all that rough. I'm used to driving Big vehicles with huge tires. Maybe i'm just to into how well it eases into 80mph and you don't even notice. lol.

as far as the motor, everything i've read leads to it being very stout and handling even more power than it already has. I'll definitely be doing a tune to up the power once they've been around and everyone else comes away with no problems lol.

VividRacing

26 PSI is also relative, you have to remember 26 PS from this turbo is not the same as 26 PSI from a larger turbo

I have been driving my Evo every day for 4 years @ 28 PSI, I think Mercedes has this handled as long as the keep the car stock. Reliability once you start modifying it is anyone's guess but typically if you start with a solid vehicle and mod it correctly things are okay

Quadcammer

hows that exactly?

VividRacing

Explained simply, a larger turbo forcing 26 PSI into the motor is moving a larger amount of air in order to reach that same amount of pressure

For example, you can run 26 LBS of boost on a stock turbo ALL DAY as that is what Mercedes built the car for

but say you strap something like a Garret GT40 on the car, 26 PSI could be too much for it to handle

Valvestud

Hmmm, Makes no sense to me either. I deal in valving and pressures all day. 26 PSI is 26 PSI. Doesn't matter how it gets there in terms of volume applied..... right?

Quadcammer

hmm, I'm not sure I agree. If the resistance is the same (i.e. you haven't changed anything in the intake/heads/exhaust, etc) a greater flow from the larger turbo should result in more boost, just as going to a smaller pulley on a supercharger results in more boost.

Furthermore, while the boost will be the same, the larger compressor will likely be more efficient, so you end up with a cooler intake charge, thereby you should make more power. Obviously you'd need more fueling for that, but thats a given.

VividRacing

Exactly, 26 PSI is 26 PSI but a larger compressor and housing is flowing more air at the same pressure. You've changed the resistance a lot by having a larger turbo that flows better.

eason

water hose is the best example. 26PSI garden hose vs 26PSI fire truck hose. The big hose will always move more volume.

VividRacing

I was going to say a straw but didn't think it made sense, that makes a lot more sense! Thank you

Jons95c36amg

Its a new motor in its first year of production. Time will tell if its reliable. Want reliable? Go NA.

Quadcammer

thats a given, but that relates to the parts downstream of the turbo or water pump in your example.

What you are saying is that if you enlarged the intake track, intake manifold, intake ports, etcs, (i.e. made the hose bigger) you would flow more air, and I don't disagree.

My point would be that if you put a bigger water pump on the garden hose, you end up with a higher psi because the restriction source has remained the same.

VividRacing

That's also true but we have boost controllers and wastegates that keep the pressure regulated