B Feelgood

A couple of months ago I picked up a 2009 SL63. When doing my first oil change on the car, I noticed some of the exhaust piping seemed to look shinier than the rest. I took a couple of pictures of the exhaust and did some searching on the net. It turns out that the car actually has Kleemann's Stage 2 upgrades which include exhaust manifolds, 200 cell cats, and downpipes. I called up Brandon at Kleemann and he confirmed that the mods were completed at their shop in Colorado. He then offered to check out the ECU to make sure it was running the latest software if I were to send it in, which I did. I also took out the charcoal filters and added a set of K&N air filters.

Long story short, I am extremely curious to see what kind of power my car is making. I found a speed shop close by that is equipped with a dyno and am taking my car there this weekend. The owner/operator asked me to find out which gear has a 1:1 ratio or is closest to a 1:1 ratio for the SL63 to get the most accurate reading. Which gear would this be? Any other tips that I should know about prior to going or to tell the operator upon arriving?

ttboost

You should run whatever gear gets you to about 100mph...likely 3rd...that's about all the air they can usually blow on the car...

sound 8

Heh, look forward to the figures you get.

okbarnett

you should do some research on the kind of dyno the shop has. Many give false or inconsistant readings so you may not be getting a accurate hp reading. I find that most Mustang dynos are highly regarded, search their site and find the nearest to you

ttboost

...and the dyno operator is just as important...in the end it's just a number...and that number will be different dyno to dyno...so don't get all worked up over the number...get worked up over the changes on a specific dyno...

sound 8

And of course, make sure your engine is running on good fuel, recent service
new plugs etc

Thericker

Copy Sound8's every word, he gained 50bhp modifying the exhaust TIPPS alone..

Benz-O-Rama

Wax. Make sure it's waxed.

Make sure when they strap it down, they don't throw the straps over the rear ride height sensor arms. Unless they have history strapping down an SL, there's a good chance they're gonna break those sensors if you don't guide them.

Thericker

But let's not forget rolling windows all the way up, drag coefficient is still factor here

ttboost

I would make sure you have the Performance Box in the window too, might as well take advantage of the time and get some 60-130's...

B Feelgood

Haha, you guys are too much

I did find instructions on how to activate dyno mode for an SL55 however. I am going to try it out today and see if it works on the SL63 as well. Also, I seen on Wikipedia that 5th gear is supposedly 1:1 ratio. Obviously I don't trust 91% of what I see on that site but it was the only relevant information I could find. The dyno operator said that gears with more than a 1:1 ratio will read lower on power and gears with a lower ratio will read higher on power, sound true or just BS? It is a a 224x Dynojet chassis dyno btw.

http://en.wikipedia.org/wiki/Mercede...c_transmission

https://mbworld.org/forums/sl55-amg-...tml?styleid=19

ttboost

The goal of a dyno is to simulate "real world driving". It's all about cooling ability with the fans. 1:1 will get you way faster than that dyno and fans can efficiently cool you, unless he has cooling fans used by NASA. Most everyone dynos in 3rd. That will get you about 100-110mph or so, which is still a little faster than those fans can simulate. The reality is you won't see much of a difference in numbers between 3rd and 4th. In the end, it's all about the delta in numbers, not necessarily the number itself. Dyno your car in 3rd and that will be your baseline...and always dyno, on that dyno, in 3rd from now on, and you can accurately track your changes/improvements.

B Feelgood

I think that this place primarily deals with Mustangs, particularly older ones. You're correct though, winding out 5th gear would practically have the car flying on that dyno, lol. I understand that it is a tuning tool to see the power changes when mods are added/subtracted, will vary depending on who is operating it that day, and also all four different kinds of dynos will give different numbers. However, it will be nice to make sure my A/F is optimized, that there is no spark blowout, and just to give me a ballpark idea of what kind of power it's actually making.

Benz-O-Rama

I believe on your 7G, 5th gear is 1:1, but you're going to have better luck in 3rd and 4th. We 5speed guys, dyno in 3rd, but I think a lot of the NatAss E63 guys, dyno in 4th. But whichever you use, always use that gear, always use that dyno, and always use that dyno operator if possible. As mentioned, the number isn't what's important here, it the delta, pre/post tuning and mods


I'm serious on the rear tie down straps. Don't let them toss the straps OVER the height sensor arms. It's gonna turn into a bad day, real quick

sound 8

The main reason I sold my 2009 SL63 was power, and torque.
I am looking forward to the figures, but how does it drive, say compared with
your GTR. What extra power did Kleeman say you could get.