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Discussion Starter · #1 ·
Any thoughts or experiences on this dynamometer?

Click on Dyno Info.

http://advancedmotorsport.com/site/main.htm
 

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Discussion Starter · #2 ·
From AMS website:

LPS 3000 All Wheel Drive Dynamometer (imported special from Germany). A dyno so highly regarded that it is the only dyno used by major manufacturers such as: Audi ,Volkswagen, Porsche, BMW, Mercedes, ..etc. In fact Audi/VW consider the MAHA such an integral part of working with their vehicles, that they have listed it with a factory tool number and you can purchase it directly from them if you so wish.


There are 2 main obstacles when using a chassis dyno, the first is airflow. Most fans used on chassis dynamometers are taken from
contractor suppliers and struggle to simulate a 10-20 MPH road speed, which is equivalent to your doctor asking you to submit to a fitness test while in a sauna. Needless to say, your score will be low. The MAHA approved custom built,"AIR 8" fan on the AMS MAHA dyno, flows over 80,000 CFM (cubic feet/minute) or a road speed of 60-70 MPH!

The second obstacle, is that most dyno's only measure "wheel horsepower" - that is the power that isn't sapped away by everything
located after the clutch (transmission, differentials, driveshaft, axles, even the wheels and tires themselves!). And since wheel
horsepower readings are dependent on the temperature of your transmission and differential oils (cold oil is like molasses and warm is like water..warm oil eats less power) and tire temperature (cold tires offer less resistance than warm sticky tires) so driveline loss can be inconsistant or as an expert refered to it as a moving target !

Many people simply add back a "guesstimate" of the parasitic drag of these components anywhere from 10-20% for FWD or RWD cars and 25-40% for AWD or 4WD cars. The final numbers are only as accurate as the tuner's best guess.

AMS and many OE manufactures have felt that was an unacceptable platform to tune a vehicle from and went in search of something more precise and reliable.

The result of our search was the MAHA LPS 3000.
The inherent beauty of a dyno system like the MAHA LPS 3000, is that after it has measured the wheel horsepower, it measures the resistance of the entire drive train from the clutch to the tires So instead of dynoing a vehicle with a reported 200HP and measuring only 150HP at the wheel, and ASSUMING that 50HP was eaten up by the drag of the drivetrain and wheels The LPS 3000 actually measures the drag loss during the coast down phase. In fact, if the drag loss is only 30 HP, you know beyond a "guesstimate" that your engine only made 180HP, or if the drag was 50HP, you will know EXACTLY how much power your vehicle is really making. However, with a drag measurement you can rest assured that you have isolated ONLY the Engine's HP and not the engine's power minus an unknown amount of drag. The system also corrects for enviromental conditions.

Thus far every stock production car that AMS has tested from Audi, VW and Porsche has dyno'ed within 0-5 HP of the factory crank Horsepower claim. It's that accurate!

We invite all European car enthusiasts to visit our facility and make use of this amazingly accurate tool to make your vehicle the best it can be!
 

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Discussion Starter · #3 ·
Going to give this machine a spin next week. Will post my experience soon after.

Cheers.
 

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Discussion Starter · #4 · (Edited)
So I just returned from AMS and results are in.

1985 US spec 500 SEC (California Emissions)
166,XXX miles (stock engine and drivetrain)

Stock exhaust as follows:
US log style manifolds
Crossover above bell housing to
Single exhaust to
Pre-cat to
Cat to
Resonator to
Rear muffler.

And here's the pudding:[V]
 

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Discussion Starter · #6 ·
Yes that is correct, 156 adjusted horses at the crank.

Stock figures from factory:

184 hp @ 4500 rpm
247 tq @ 2000 rpm
 

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hey there, would you mind shooting the originals to my email?

[email protected]


Thanks!

Jonathan
 

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thanks dude! I like to keep an archive of M116/117 dyno runs..always nice to have for comparison sake etc..:)

Look forward to the next round of numbers!!!


Jonathan
 

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48hp - 4/11/2006 4:08 PM

Yes that is correct, 156 adjusted horses at the crank.

Stock figures from factory:

184 hp @ 4500 rpm
247 tq @ 2000 rpm
I'm confused. The AMS dyno says you have roughy 156 crank HP.....and MB says you have 184 crank HP.

How can the AMS numbers be accurate?

Bruce
 

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Discussion Starter · #11 ·
Hi Bruce,

I would suspect that with 166k on the clock, extremely restrictive Cali exhaust, slightly out of tune and the general age of bits will have a lot to do with the loss of HP. MB rates it at 184 fresh from the factory. Believe me, I was hoping for nicer numbers but if you look at the RWHP, it is very unlikely that that the W126 drivetrain accounts for a 55hp loss.

This MAHA unit is claimed "state of the art" and if AMS are trying to promote product they wouldn't use a dyno less than absolute accurate. I was told that only 4-5 of these MAHA dyno's exist in the US.

http://maha.de/

So I hope to use this one facility for upcoming dyno runs to accurately rate upgrades.

Next, tri-y euro manifolds, free flow cat and muffler. That should help the SEC breath!

[:)]
 

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I'm going to get a dyno done on mine eventually, that'll be interesting to compare.

T
 

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Discussion Starter · #13 ·
Spec'd my current engine configuration today.

Ignition Timing:

Op temp 87C
Idle 672rpm
+- 1 degree
1500rpm
+-17 degrees
3000rpm
+-30 degrees

Compression:
Averaged 147 ft lbs per cyclinder.

Spark plug gaps varied from .032-.035
 

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Discussion Starter · #14 ·
Another date set for this Friday. The changes made:

Complete dual exhaust with euro tri-y manifolds.
Ignition timing adjusted to advanced +-13 degrees at idle.
Spark plugs gapped to .042 (thanks jonathan)

I expect a nice increase as it definitely feels very strong since making the above changes.

Will post results soon after.
 

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Discussion Starter · #15 ·
The results are in.

The new euro exhaust system showed some nice gains all the way thru, even with a cat installed! Attached is a pdf of my first run and a pdf comp stock vs. mod.
 

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