Full Bolt Ons E63 Dyno Update
So I went back to the dyno and this time I used a wideband. I should say I tried to use one. The sniffer wouldn't properly fit in the exhaust so I'm basically in the same position I was in before. The R.O.W. airbox lids make 0 more horsepower. THE TUNE IS NOT MAKING THE CAR THAT RICH. IT IS A WIDEBAND NOT READING CORRECTLY.
At 5400 rpm the AFR was 12.3 I do not know if it will continue trending downwards. This was also after 200 cell metal cats so the afr is slightly skewed. My goal was get a full pull in and send the file to Jerry to see if he felt it could be leaned out more, but that won't be able to happen until I weld a bung in.
I will need to weld a bung in the collector and data log my afr. A bone stock CLS63 made 405 whp and 377 lbs ft. My car with full bolt ons and a healthy engine made 430 whp and 414 lbs ft. My car has tune only power, if that.
The last graph is of my friends S600 with intakes, ecu/tcu tune, methanol, and some exhaust work done. Check out that torque.
My car has all the mods in my signature:

BONE STOCK CLS 63 (6.2 Liter)

S600 (Twin Turbo V12)

Last edited by layzie12g; Sep 27, 2015 at 10:22 PM.
OE tune is a little more aggressive
YOur figures are correct maybe you should opt for a OE tune if you want more power
The Dynamics was set up to read much closer to a Dyno Jet then if the Dynamics was left uncorrected.
So row boxes, afe filters, Eurocharged tune, MBH long tubes, 3" exhaust to factory mufflers equates to 25 more wheel horsepower then a bone stock car???? I would have to disagree with you.
I'm not following the logic. If the car made 430 whp uncorrected I would be very happy. It would trap 120-122 mph and be making 500 whp with the correction factor these graphs were made with.
Last edited by layzie12g; Sep 27, 2015 at 10:21 PM.
The cars were dyno'd one day apart. Same temperature and same correction factor on the same dyno. I wanted to get a full chart of the AFR to send to Eurocharged to lean the car out, but I was unable to do so. I will need to weld a bung in to the collector and use a wideband that way to plot a full graph.
Without the AFR being accurate a tuner has no direction to go. My car has a box tune per mods.
That being said, I guess a slightly leaner mixture at WOT and a few more degree's of ignition advance will probably net you another 10hp...maybe a another 5-10hp if the VVT tuning can improve the incoming airflow.
But I feel you in the sense that regardless of the net difference, the actual gain seems quite low (25hp peak). I hear that longtubes and a custom tune gains around 50-60hp. Perhaps the tune really might be the issue man.
I have to ask...how lovely does it sound now though? Does it sound like a muscular wobbly-jelly old school v8 as you accelerate with light throttle?
The cars were dyno'd one day apart. Same temperature and same correction factor on the same dyno. I wanted to get a full chart of the AFR to send to Eurocharged to lean the car out, but I was unable to do so. I will need to weld a bung in to the collector and use a wideband that way to plot a full graph.
Without the AFR being accurate a tuner has no direction to go. My car has a box tune per mods.
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I spoke with MHP about the lack of X pipe. They felt it may be costing me 10 hp. I have a feeling the afr continues to dive rich. I know the box tunes must be save. I have only tuned turbocharged cars. I would assume I have at least 20 horsepower to gain if the afr follows its trend downwards.
Last edited by layzie12g; Sep 28, 2015 at 12:52 PM.
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I spoke with MHP about the lack of X pipe. They felt it may be costing me 10 hp. I have a feeling the afr continues to dive rich. I know the box tunes must be save. I have only tuned turbocharged cars. I would assume I have at least 20 horsepower to gain if the afr follows its trend downwards.

I witnessed a similar scenario last December with a C63. He had almost exact upgrades as you with an EC canned tune and the car was weak in my opinion - (408 STD) with a very fat AFR. My [C63] car then with only removed CF and K&N and tuning (OE); made 439 with a 12.6 to 12.7 AFR...not sure where the timing is.
i read on the forums that some computers dont react well and many people have had issues with tunes not uploading properly
or maybe just go with a different tune hopefully putting it back to original and then reloading fixes your issue




Last edited by BLKROKT; Sep 28, 2015 at 07:42 PM.
I wonder if the cam angle might need to be be adjusted also. It's reasons like this that I don't like generic tunes. Esp for N/A motors where every little bit of CFM needs to be optimised.
Also BLKROKT....trapping 120+?? Damn, i would love it if my car can do that once modded!
I asked him if there was a possibility it did not load. He felt it wasnt possible because I would have had a cel since I no longer have primary cats. Ill have to wait till this weekend to get a wideband in the exhaust.
See what I'm getting at? You mention in one of your posts that the numbers are irrelevant and you're more concerned about the net gain. My argument is that your car was already on its way to those gains and you just didn't know about it.




Not every car that rolls of the lot has the same hp. Maybe they had a strong engine from the start and yours not so much. Maybe that bone stock cls was bought use and has a tune on it from a previous owner without the owner knowing. There are a lot of variables in here.
However, the bottom line is that you shouldn't compare two completely different cars that in theory should be identical. Because they likely aren't.
Good luck moving forward. As others have recommended, start with the tune. In fact, with your setup, you should have a professional tune it on the dyno.
114 mph trap speed since "dynos are not for measuring horsepower".
Bad cam adjusters? Totally possible.
I think Ill have a supercharger by the time I spend anymore time with it.




