Eurocharged Canada

alx

what are the documented gains from your lighter pulley?

lighter flywheel does make a difference because of its larger diameter, but a crank pulley has a fairly small diameter and as such reduction in weight will not result in significant hp gains...

nice execution though.. the pics on your web site does look great..

alex
few cars

Dr. C36

If you do a search you can find alot of info on it, heres a dyno for NA M113 V8 from their website:

alx

so they gain 10-15hp across the rev range from a lighter pulley?

i might get flamed for that but this is a typical gain from a lighter _and_ underdriven pulley.

there must be some magic here...

alex
few cars

Addicted2Speed

I have this on my SLK55. I installed this along with new ecu tuning and air filters and my car showed a 20-23whp gain (from ~408whp to ~430whp). Not sure how much of this is ecu tuning and air filters though (probably a lot)

IMO, this will definitely give you at least 5-8whp though...

Dr. C36

air filters almost never make any power on the dyno for these NA 5.5L AMGs (mainly just for sound), but your ECU tuning definitely helps, probably half/half between pulley & ECU. nice gains thats a very nice setup you have (P.SS love the wheels in your sig ).

jimmydagreek

Wow, that's a great price! I ran the AMS crankshaft pulley in my 01 E55 and LOVED IT!!! I never dyno'd the car but I wish I did because after the computer learned the pulley after only a couple of days, it was amazing the power that was unleashed. I mean off the line yes, nice and sharp but between 80-120 it's pushed me back into my seat and never let up!

Ppower

Underdrive pulleys usually yield about 10-15hp, but at the cost of some cooling too. If the pulley is just lighter=0hp gain or so close to 0 isn't worth it.

Pp

SLK_BLK

Is the offer still on? Will it fit SLK55 (R171)?? Please PM me, thanks!

Dr. C36

Every lb you take off the crank pulley equates to roughly 2.7HP @ the crank, roughly 15% of power gains on underdrive pulleys comes from underdriving, and 85% from weight reduction as per numerous famous pulley manufacturers (aka URI and etc after thousands of dynos on all their models). It is the WEIGHT and center of mass that counts most, NOT underdriving. Underdriving only helps at the very top of the power band (5000 rpm+), it doesn't do anything for below that. Crank pulleys are the opposite, the majority of their power gains are in the low to midrange giving you that serious pulling power that throws you back in the seat (it helps top end as well just not as much) vs. just a high rpm burst. two different types of mods, two different results, both have been dyno proven for decades to work since the muscle car era.

With that said on MBs you can actually do both b/c AMS are stock diameter and E\/osport pulleys only do accessory systems. So in this case the best answer is get both

jimmydagreek

Ppower

So, that being said then how much lighter are they then stock? Funny nobody posts about how much lighter their pulley is than the stock one in concrete numbers like lbs. just mystical % numbers. Kind of like the 2.7bhp is "roughly". They state on their website 60-70% lighter than stock. Well what is stock? 5lbs? So their pulley weighs about 2.3lbs or a whole 5hp gain about. Heck we'll even go to say it weighs 4lbs less than stock which would make it about 10hp gain. Of course they are going to say you don't get much gains from underdriving, because they don't underdrive their crank pulley.

Using a smaller crank pulley does nothing below 5000rpm? LOL...So you telling me it isn't easier and faster to spool up something that is smaller in diameter vs. something that is larger at the low end? And say with like 5" pulley won't reach say 4000 rpm faster than a 6" pulley with both being the same weight and equal amount of force applied?

http://www.marchperf.com/superford1.html
not one word about weighing less, just about them being smaller in size. 15hp for less than $100.

http://www.modsearch.com/articles/un...e_pulleys.html



Either way $500 for just a "lighter crank pulley" for blah 10-13hp isn't worth it.

jimmydagreek

I don't know the exact weights of either and I should have weighed them both before I installed the AMS. All I have to say is that the stock is WAY heavier, maybe the 60-70% claimed and I loved the power the light pulley gave. The quality of the pulley and the service is top notch!

SLK_BLK

I am trying to get a quote from LET but no reply so far, is the promote finished?

Addicted2Speed

You might want to give them a call, their number is listed at the first post.

SLK_BLK

Will do, thanks!

Dr. C36

You can contact AMS directly if you like.

SLK_BLK

I did but no reply!

jimmydagreek

Contact Omey direct. He responds best at Benzworld under the name omeyhomey...

c55asleep?

Great guy and product. It really weighs a lot less than the stock, plus the construction of the pulley is way better than oem. When i removed mine the oem pulley was even missing pieces of rubber and the car only had about 13,000 miles. I did not weigh the AMS pulley but i know for a fact that at least 4 pounds came off. You can feel it in your hands!

SLK_BLK

Ordered!!! Can wait to see the result!

jimmydagreek

+1

Nemphys

Just installed the pulley today on my SLK55 and I weighed it first
The stock pulley is 2,92 kg (I think this should be 6,44 lbs), whereas the AMS pulley is 1,29 kg (should be 2,84 lbs). So, the AMS pulley is 1,63 kg (3,6 lbs) lighter than stock, which should roughly mean a 10hp gain.
I haven't found the time to drive it yet, I will post impressions as soon as I do!

jimmydagreek

You should love it, I did!

c55asleep?

Same here Jimmy, btw I was close on my est. With the weight difference.