E63 vs C63 engine
#1
Junior Member
Thread Starter
E63 vs C63 engine
Why does the C63 engine have less horsepower than the E63? Is there only software or also mechanical differences between the two?
#2
Don't be fooled by both of them saying "63". Only the C's engine is an actual 6.3 liter. The E's engine is a 5.5 liter with two superchargers. The C doesn't have a supercharger.
So, they have completely different characteristics.
So, they have completely different characteristics.
#3
Super Member
I think he might be referring to the MY 2007-2011 E63 which share the same engine as the C63, but are rated higher.
The engine is the same, it is software differences as far as i know. Mercedes doesn't want their "cheaper" car to be lighter and have equal horsepower, so they tune the E63 engines so they are rated higher... to sell better.
If you do the same aftermarket ECU upgrade to both engines you will be at the same horsepower I believe.
The engine is the same, it is software differences as far as i know. Mercedes doesn't want their "cheaper" car to be lighter and have equal horsepower, so they tune the E63 engines so they are rated higher... to sell better.
If you do the same aftermarket ECU upgrade to both engines you will be at the same horsepower I believe.
#4
Junior Member
Thread Starter
I just bought my self a C63 engine to put in a hot rod so I was a bit worried to lose some horsepowers to the E63 engine.
#5
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'92 300E, '06 E55
The attached dyno screenshot shows how much power you can gain at higher RPM just by removing the throttle restriction. You can clearly see when the stock tune causes the motor to run out of airflow when horsepower flatlines from 5,000RPM to redline. Allowing the throttle to open fully lets much more air in and allows the motor to continue making power.
Jailbreak's full tune adds even more power and shows significant gains at all RPMs, but this particular dyno run shows how important the throttle plate reprogramming is to unlocking the full potential of the C63. The M156 in the C class is identical to the other models using the M156 and it is only the stock tune that artificially limits power.
Last edited by HGMotorsports; 03-27-2015 at 11:45 AM.
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