I picked up a Eurocharged tune recently and wanted to see how much impact it has on my stock 2013 C63 P31 (only mod is secondary cat delete). I specifically opted for a V5 tune instead of a V7 because of personal preference.

To make things interesting, I also have the dyno files from my old 2009 C63 (also only had secondary cat delete) that had a V4 tune.

Same exact dyno, different cars, but same exact mods.

Quick shoutout to European Auto Source in Anaheim for helping me with this 'experiment' with their dynojet.

First dyno is my old 09 C63 stock vs Eurocharged V4 tune



Next dyno is my '13 C63 P31 stock vs Eurocharged V5 tune



Lastly is all four dynos together...



Final numbers are...

2009 C63 stock: 364/360
2009 C63 tuned: 413/371
2013 C63 P31 stock: 404/355
2013 C63 P31 tuned: 423/377

All in all, the numbers are as expected but its nice to finally see how all four compare on paper.

 

I like the cleanliness of all these curves:

- SAE correction factor used (versus STD which would have inflated the results)

- SAE correction factor seems to be 0,99 for all 4 curves if I am reading the charts properly, so no weird distortions due to non-typical temperatures, barometric pressures, or humidity.

- Also pretty much what I would expect to see - no strange or unicorn results.

Nicely done.

Jim G

 

19 horsepower on a PP with a tune? And how much is a Eurocharged tune? Does it add anything else?

 

Thanks I agree. Everything was inline with my expectations so I can't complain about the power gains.

~20whp gain. Contact eurocharged and they might have some leftover units available at holiday pricing. V5 has a few benefits besides power. Most notably is the transmission blip.

 

It is actually a gain of "only" 19.1 rear wheel hp (423.63 - 404.56). BUT, don't look at just the absolute peak power. look at what it has done to the powerband.

For example, with the stock P31 tune, the power at the rear wheels doesn't hit 400 hp until 6100 rpm.

With the V5 tune, it hits 400 at 5600 rpm.

The engine appears to rev limit at about 7000 rpm (even though the P31 kit apparently enables revving to about 7200).

So, the rpm range in which the power meets or exceeds 400 rwhp has stretched from 900 rpm to 1400 rpm - an increase of 56% in the width of the powerband inw hich power at the wheels exceeds 400 rwhp.

This is a VERY significant benefit in acceleration scenarios.

This is because high performance engines always have a peakier powerband than more pedestrain engines, so you have to keep them in the rpm band in which they make good power. What hampers that effort is the need to keep the engine in that powerband via transmission gear shifting. When the engine hits the rev limit, you HAVE to shift to the next gear. But, that normally drops the rpm quite a bit - even with a 7-speed transmission - to an rpm where the power is normally notably lower. And, even with the short shift times of our C63 transmissions when in "S", or even better in "M", there is a brief interruption in power delivery.

You also have to shift DOWN more often when a powerband is narrower, in order to keep the power up.

By stretching the width of the powerband, you reduce the number of times you need to shift, AND you reduce the magnitude of the power drop when you do so on an upshift.

Furthermore, you have to put "small" power increases like this in perspective with other performance increasing features in the P31 and other packages. For example, the lighter wheels and lighter brakes reduce rotational inertia a small, but notable, amount, which improves acceleration AND handling.

The C63, like so many other high performance cars "picks up a bit here and bit there" and all the bits added together make for a transformed driving experience.

Intence clearly knows this stuff. And to his credit, he is not seduced by the more aggressive V7 tune which also unfortunately appears to stress the durability of the clutch pack in the transmission, and he particularly likes the exhaust burble of the V5 on downshift rev matching.

Hard to quarrel with any of that.

Jim G

 

Cant trust any of this because dyno's can be manipulated.







#trolololol

 

Is this is a confirmed issue with the V7 tune?

 

Couldn't have said it better. V5 just seems more stable based on what I've seen. I think the newest V7 has most of its early issues fixed but I'll wait until more feedback is out.

 

Good job OP. Nice to see these side by side and the overlay

 

In fairness, no. No one has confirmed this scientifically. But take a look at the threads on this forum that discuss transmission slip problems, look at the tunes those cars are running, and draw your OWN conclusions, as I have done.

Jim G

 

Correlation does not equal causation....

 

Makes sense, didn't notice a big jump from stock+row+are to that+v6 tune. Well besides the meaner downshifts and the "surge" from 1st to 2nd which caught me off guard at first. Now I look forward to it.

 

That's true. hat's why I said it has not been scientifically shown, at least yet. But think about it. Sharper upshifts put higher peak loads on clutch plates. More aggressive downshifting puts higher inertia loads on clutches. How sharp and how aggressive can you go before it shows up as notably shorter parts lifetimes? And, who do you think has the better qualified resources and testing budgets to determine what is ok and what is over the line: Mercedes or a small tuner shop?

There's also a big difference in consequential costs in repairing an MB transmission versus say a GM transmission. I was able to handle the repair cost of a GM transmission when I destroyed one. Not so sure about whetehr I am willing to pay for rebuilding an MB tranny.

Jim G

 

 

~2k to upgrade the clutch packs.

https://www.amsperformance.com/cart/...-upgrade.html/

It's also not a difficult job to swap them out.

 

Then what is causing the slippage on some C63s?

Jim G

 

I made 400 whp on a dynojet with my p31.only mod was row boxes but with oem filters.

Then made 442 after a few tunes 405rwt with adding prodry filters also.

 

 

okaaay . . .

Jim G

 

These ghaay. (Spanish Accent)

 

Maybe ask that question over there --> https://mbworld.org/forums/c63-c63s-amg-215/

 

Got a real clever fella right here guys... Look out...

 

Thanks brah.