500E on the Dyno - PeachParts Mercedes-Benz Forum

#1 11-04-2003, 08:52 PM

Hello all,

I just got back from Dyno Day at the local Ricer shop. Here are the results:

Run 11: Max Power = 253.00 Max Torque = 271.1
Run 13: Max Power = 255.30 Max Torque = 277.6

The dyno operator had a hard time keeping the car from downshifting. These runs start at about 4k RPM in 3rd gear.

He was a little surprised by the mighty 500E. :-)

He suggested 22% loss. If my math is correct my stock 500E (K&N's) is making 326.92 at the crank. Sounds right?

Any thoughts?

Dave

PS. Someone buy this car so I can get an E55 and have Donnie put a blower on it.

PSS. on a run where the car downshifted the dyno printed POWER = 292.7 and Torque of 363.8!

gerryvz · #2 11-04-2003, 11:55 PM

This is way cool, thanks for the info, Dave!

Cheers,
Gerry

yhliem · #3 11-05-2003, 03:33 AM

Quote:

Originally posted by daveb12

He suggested 22% loss. If my math is correct my stock 500E (K&N's) is making 326.92 at the crank. Sounds right?

since the '92 500E was rated at 326hp, i'd say the dyno was pretty accurate.

however, the devil's advocate in me says that this assumes that he didn't know that factory rating to begin with. if he KNEW that the 500E was rated at 326hp, he could have just done the math the other way to get the numbers to come out right.

Quote:

Originally posted by daveb12

PSS. on a run where the car downshifted the dyno printed POWER = 292.7 and Torque of 363.8!

that would be an hp rating at the flywheel of 374 hp and 466 lbs-ft.

i think maybe the dyno was a little overwhelmed by the sudden application of a LOT of power. remember that most MB engines have a sweet spot in the mid-range and that there's a time component to calculating hp. ie. hp = amount of work / time

placo1 · #4 11-05-2003, 10:49 AM

Dave those are some great figures! What kind of Dyno was used? Did you have a chance to do any 1/4 mile runs?

Cannoli · #5 11-05-2003, 01:52 PM

... shouldn't HP and Torque curves intersect at 5252 RPM?

HP = Torque (ft-lbs) x Crank Speed (RPM) / 5252

Hmmm...

super SEC · #6 11-05-2003, 02:19 PM

Sometimes they are two completely different graphs placed on top of one another. I had a DynoJet shop do that to my dyno graph. The hp was one graph and the torque was another graph and they just super imposed them. I prefer when they use one graph instead of two seperate ones because you have something that looks like this.

super SEC · #7 11-05-2003, 02:40 PM

Here is how my last one looked. I wasn't paying attention or I would have had them change the graph:

#8 11-06-2003, 07:51 AM

The Dyno was a portable "DynoJet" that a guy pulled in behind a pickup.

I did have an hour, but we were the first of the day and they were already 30 minutes behind getting set up. So, I didn't get to do any 1/4 mile runs.

A local competitor to this shop is having a DYNO DAY on the 18th. I just might run down and compare the 2 results.

Dave

CGenberg · #9 11-10-2003, 09:30 PM

Dave,

There is a trick to running the 500E on the dyno and getting the peak torque band. Once the car is out of 3rd gear with the pedal to the floor, you'll have missed the torque peak. The typical dyno operator gets in the car and floors it without realizing that your beast will downshift until about 105mph.

The trick is to not activate the kickdown switch below the accelerator. With the car off, have the dyno operator test the feel of the accelerator's WOT position vs. Kickdown position. With a bit of practice, he can learn the position he should not exceed. There is resistance from the kickdown switch.

Have the operator work the throttle down to the WOT (but no kickdown position) by 3,500 rpm gradually and you'll get a nice run. If he presses it to quickly, it'll kick down anyway, but once it's up to about 80mph with 3/4 throttle, you can usually press it the rest of the way (to the kickdown switch) without getting a 4-3 downshift.

Hope this helps get the most out of your next dyno run. Test it on the road to get yourself familiar with it and you'll be better able to instruct the operator.

super SEC · #10 11-26-2003, 03:53 PM

I just got back from the dyno. I wanted to see what improvement my custom headers made to hp and tq. Looks to be pretty close to what you see on a 500E with a 100 shot of NOS. My set-up is a stock 560 SEC engine with custom headers and exhaust, ATI Procharger P-1SC, methanol/water injection, MSD ignition (from Bergwerks) and MSD Boost Timing Master(Summit Racing). It is nice to have this power on demand whenever I want but a 100 shot of NOS would be amazing. I'm going to change the pully size for more boost and do another run in a few weeks. Uncorrected RWHP, I started with 306.6 RWHP and 372.6 RWTQ and after the installation of the headers I have 345.6 RWHP and 397.7 RWTQ. I'd say that the headers were worth while!

BauhnBuster · #11 11-27-2003, 04:27 PM

Super SEC. That is awesome. I love the 560 SEC and your car is even that much better. It is cool how you are tracking everything with the dyno. It really shows the value of each performance piece installed. That being said......

Hey Dave, now that you have a baseline, start to put on performance parts like the "Y" pipe or other tweaks. The "Y" pipe thread is showing how the peice really wakes our cars up. Maybe a dyno run with the 500 will prove it. I would love to but it is hard for me to get on the dyno with my 500. Nice work and keep the board posted. Happy Thanksgiving Benz owners down south. Cheers!

Shaun