dbasons55

This is my first dyno since i owned a car so i wanted to share it with everyone here, this dyno is NOT on the wheel its on the cranck shaft and i thought i would get something around 612 HP or so my car is running 98 octane gas since i bought it till today, i tried getting a rwhp but the car was not getting enough grip in the third gear, we tried on the forth gear and the dyno topped on its limit (150 mph) so couldn't do it.

Hopefully there is a dynojet that i will try to make time for soon in order to get the proper readings but since i have done those i might as well put them on.

The best thing about the dyno run was, the car went on dyno mood without pushing any buttons. I thought i was going to run into problems but it went real smooth went on the dyno and it automatically detected the changes and self programed to dyno (went on with ESP off and M mood on). Thought to add this part so that it could be usefull for the future.

Any feedbacks on the sheets to help me understand what's going on will be appreciated

Doctodd33

just curious but what year car? I know the engine is the same, but still curious. I think i see max numbers of 645.9HP, 644.7 lb torque?!?!?!

sweet

T

newton22

I think those are all bhp numbers, none of them torque.

Pretty healthy. How did you dyno at the crank? Surely you didn't take out the motor?

Doctodd33

The top scanned pic is HP...bottom one is torque. They are labeled.

T

whoover

What is the automatic dyno mode about? What is it that the car detects? Is it some kind of instrumentation?

2MANYCARS

Dyno mode or not, those are still some sick numbers from a stock 4 door saloon car.

BoostedS55

i got an S55 and i have a free rev limiterat about 4k, so i'm kinda curious as to how these numbers came about. was it a type of G meter? i have seen the upper price ones pretty right on, within ~25 HP or so, but that was around 400 HP , and the margin of error i would imagine would be about 50% larger up there [way up there ]

but either way some more info would be great!

dbasons55

guys let me tell you one thing this is my first dyno ever to be done to a car.

my car is S65 W221 Stock

when i say that the car configure itself to dyno mood is that its not like the S65 W220 or like the E55 when you put in the key turn on the ignition once and click on the reset button three times as i believe is the way to pop out the dyno mood settings or something like that, its like i said as soon as the car was running on the dyno at slow speed it automatically went on to dyno mood.

1st run was a test run
2nd run was the proper run

the guy who was doing the dyno said it was on cranck shaft its cuz he ran it without putting any load on the wheels, when he tried to put some load the car was not gripping on third gear when we tried at forth gear the dyno topped at 150mph and we couldn't get the numbers at 5500 rpm to know the rwhp. He also said that if you want us to get some reading we should get a couple of people to sit on the trunk of the car yeah right as if i have stolen this car LOL

I hope this would answer somethings but what i really would want someone to explain this graph, its use and what would be my expected rwhp. why am i not getting 612bhp is AMG giving more power to the car so that they can match up with the S65 W220 since this car is heavier please any input will help thanks again

Doctodd33

that sounds like nothing ive heard before.....i think you might need another run somewhere else, or a direct reading for rear wheel horsepower, or someone else to dyno their s65 w221 to back yours up. All the dyno shops i ever dealth with or have seen on TV measure REAR WHEEL HP. I hope this dyno shop is accurate, and not trying to inflate numbers for whatever reason. Corrected numbers can take into account weather, altitude, etc. But this sounds like a bit much.

T

whoover

This is a chassis dyno, not an engine dyno, so you can only measure power at the wheels. Normally it can produce two figures: "wheel" power/torque and "crank" power/torque. The latter is the wheel figures corrected for drivetrain losses using a second reading called coastdown. It basically runs the dyno in reverse to find out how much torque the drive train uses. This is added to the wheel reading to compute the theoretical output at the crank.

I don't know how your shop can produce these "crank" readings without getting accurate wheel readings. You should ask them what these numbers represent.

dbasons55

thanks i will ask the shop again and i do also have some plans to do some more dyno testing once i have time i will find a dynojet and will try my luck their hopefully i will also wait for replies from others maybe i can gather some data and figure out something soon

newton22

I see this all the time. Granted, it looks silly, but having a few friends sit in the trunk (open the trunk and let them sit in it instead of on it) will help traction significantly.

I think those are inaccurate numbers since it sounds like he dynoed at the wheels and then corrected it for crank numbers. Get some wheel numbers. For a 65, you should be in the 500-570 rwhp range.

bp95gsx

I have successfully dynoed a W221 S65 AMG at 510rwhp.