MRAMG1

Hey there E55:

Okay, so you are thinking that a 2-3 lb loss on recipricating mass is going to give you a 10to20 percent gain in mileage? Sorry but the math doesn't add up. The entire rotating assembly, crank, pistons, rods, cams, torque convertor weighs in at over 100 lbs. There is NO way a 2% reduction in mass can give you that increase in mileage. It just doesn't add up my friend. TOO many compaines report BS like this trying to get you to BUY in.

A side note, I tried undrive/ligther pullies on my stang, awhile back before the blower. I made 3 passes at the drag strip 14.3 at 96 mph, put the pullies on, LATER in the night with COOLER air, and guess what, 14.3 at 96 mph.

Moral of the story, DON'T BELEIVE EVERYTHING YOU READ

See yeah

PS: On my way home that night it started to rain, with the A/C on, headlights, and stereo on, each time my wipers would click on, the Volt meter would go into the red. I sold the pullies later that week for about 2/3 of what I paid and NEVER looked back

E55 PWR

lightweight crankpulleys have been dyno proven since the muscle car era. The topic has been prove time and time again. using 1/4 runs is HARDLY an accurate way to measure that b/c variability between 1/4 mile runs can be as much as .5-1 sec between runs so using that as a benchmark is hardly scientific. Also weight reduction off crank pulleys is alot more than 2-3lbs.

General engine theory states that ever pound taken off crank pulley equates to roughly 2.7-3 wheel HP-tq. Most lightweight crank pulleys for euro cars are between 4-7lbs lighter so its simple math.

E36 M3 boys have been using them for years, they dyno 10-12HP every time single time and have been proven to work. I'm not gonna rehash 30 years of proven dynos. Lightweight Crank pulleys have been proven time and time again to work simple as that.

I agree underdrive pulleys suck thats why I would only do stock diameter lightweight crank pulleys.

sales@eurocharged.com

lol...I'm an idiot.

MRAMG1

Hey there E55:

First thing, I am not looking to bash here, but the E36 boys, Vadium being the one who did it/dyno, and I REALLY RESPECT HIM, used aluminum, under drive pullies to get those numbers.

By the way where did you get General engine theory states that ever pound taken off crank pulley equates to roughly 2.7-3 wheel HP-tq? I have seen this on the recipracting mass, ie piston,rods, crank, but NOT flywheels, pullies.

Second, why does EVERY flywheel manufactures only claim faster reving/braking with a aluminum flywheel, and NO horsepower increase, as the flywheel shaves 15 plus pounds. Some even OVER 30 lbs on the old HIPOS!

I am just saying that balancer mass decrease does NOT gaurentee BIG horsepower increase. Your money can be better off spent in other directions.
You may see some gain, no argument here, but you will not pick up that HUGE mileage increase.

And you are right about ET NOT being a good indicator, however MPH IS A VERY GOOD indicator of HP.

See yeah

By the way, yeah under drive pullies for street cars do suck my friend

Vadim @ FD

Nope, sorry this will not happen.

Please show me a book named "General Engine Theory" and which page it is on.


Nope, believe me I have dynoed plenty E36s M3s and 325s and never saw more than 2-3 HP from lighter crank pulleys.

Underdriven, light weight accessory pulleys can make 7-12 RWHP in first three gears. Designed and dynoed those many times on many cars.

E55 PWR: I do not mean to pick on you, but everything that you just stated goes against my 27 years of experience of working on cars. It is exactly opposite and simply sounds like a typicall marketing lingo coming out of many young, inexperiences companies.

E55 PWR

crank pulleys always produce more than accessory pulley systems. Even those who have tried crank pulleys who have accessory pulley systems will agree. In addition, Accessory pulley systems work as a function of rpms, they need rpms to make a difference so you really only get decent gains above 5000rpm. Crank pulleys work as a function of torque. They make maximum gains at maximum torque which is why they produce much more low end to mid range gains than accessory pulley systems. On the E36s I had never seen a single accessory pulley kit make more than 3-4wheel HP, they just don't do that much and they force you to make a ton of sacrifices (which you should not be doing on a Mercedes in a first place, we don't drive honda civics for a reason). I had both on my E36 M3 and accessory pulleys barely did anything (similar to fan delete). The crank pulley got me roughly 10-12 Hp on the dyno throughout the rpm range. massive difference. just speaking from personal experience dynos dont lie

I know you aren't trying to pic on me but you just are not correct in this matter.

AMGSC

I just sent $270 via PayPal to VRUS for his C55 UPD and my car is with Vadim right now. After all the mods are installed, I'd like to see which pulley makes a bigger difference if any. Then we'll see what the combination of the two will do. I saved $150 vs. the EVOSPORT UDP listed at $370 + tax + shipping.

Now I just wonder if the VRUS UDP matches up in quality and performance against the EVOSPORT UPD for a C55.

The reason I do not want a different sized Crank Pulley is because I am already making 6+psi on my HPS SC kit and it would not be safe to run beyond that on a 11:1 compression ratio C55 motor.

btw... Both of these pullies are for Natually Aspirated C55s. My HPS kit uses the same pullies as a stock C55. Only thing the kit adds is a SC pulley made by HPS. Many stock C55 owners have reported great results with the AMS + EVOSPORT pulley combination. I think it's the safest mod for non-blown C55s and will not affect the warranty.

E55 PWR

the stock diameter AMS crank pulley will work on HPS cars as well, SC would never know the difference nor would the ECU. Its 100% safe. As far as the HPS warranty issue, that I don't know but if it runs off stock pulley I would assume that would not be factor. You'd have to talk to HPS directly about that.

Vadim @ FD

Wrong.

Sorry, I do not care to argue with you. It is obvious to me that you have some kind of interest in AMS and will keep pushing their product.

I wish you best of luck.