Stillen Pulley

[firedog68]

Has anyone on the forum have experince with installing stillen pulleys on the M37? I cant seem to find anything on the forum whose had this done.

Any information will be helpful....the shop I was at had a Q50 in which he had the stillen pulleys installed.

[k67p67]

Are you referring to the lightweight crank pulley or the underdrive crank pulley? Install should be identical. Same engine. FSM specifies a special tool to lock the engine in place but you can wedge a breaker bar against the ground and momentarily crank the engine if you are adventurous.

[firedog68]

I was referring to the lightweight underdrive crank pulley made by stillen. yes thought the engine was the same the owner of the Q50 said he got some additional HP out of it. Not sure if he really knows how much. He said 10 but so did stillens website.

Thanks for the info

[ArmedAviator]

I've done Steeda (high quality) underdrive pulleys (harmonic dampener, water pump, and alternator) on two Ford 4.6Ls in the past. Didn't make a difference in power/MPG. It only lightened my wallet, dimmed the lights at idle, and maybe SLIGHTLY decreased wear on belt-driven components.

IMHO, underdrive/lightweight pulleys are a waste of money.

[Ilya]

You have to get one that are stock diameter but weigh less...those in theory should actually provide benefit as there is less mass to rotate. Engine should rev faster, etc.

Smaller diameter, aka underdrive, yes...those are a waste.

[beachbum718]

Sounds like a waste of money.

[ArmedAviator]

You have to get one that are stock diameter but weigh less...those in theory should actually provide benefit as there is less mass to rotate. Engine should rev faster, etc.

Smaller diameter, aka underdrive, yes...those are a waste.

Even lighter is a waste in the grand scheme of things. It'd be money better spent to buy lighter wheels or, dare I say, go to the gym (something I really need to do). The engine is already quick to rev up and shaving a few ounces alone won't make a difference.

Save your money and spend it on a few tanks of gas.

[Altered]

I have the Stillen UD pulley in my M, as stated if someone thinks it will go faster you are indeed wasting your money. I did it simply because I felt like doing a mod, lol. I don't mind the wasted money, the engine revs no different in my opinion, the amp still has sufficient power and I have had zero issues from it. I just like the way it looks when I'm getting my oil changed, same as the strut bar. I have heard in manual 370Zs guys claim better revs, in our cars I highly doubt there will be any noticeable gain. Just an FYI for anyone interested, with all the mods in my sig my car ran the same 1/4 mile times it did stock in the closest conditions I could get.

[insanex1]

I have the Stillen UD pulley in my M, as stated if someone thinks it will go faster you are indeed wasting your money. I did it simply because I felt like doing a mod, lol. I don't mind the wasted money, the engine revs no different in my opinion, the amp still has sufficient power and I have had zero issues from it. I just like the way it looks when I'm getting my oil changed, same as the strut bar. I have heard in manual 370Zs guys claim better revs, in our cars I highly doubt there will be any noticeable gain. Just an FYI for anyone interested, with all the mods in my sig my car ran the same 1/4 mile times it did stock in the closest conditions I could get.

What's your best 1/4 mile times?

[adeedpb]

Someone here ran a 12.8 (was modded), I would say 13.4 + at all stock

[firedog68]

Thanks for the info Altered.....I'm with you with regards to spending money on Mods....running out of things to do so I say why not.......I'm glad you spoke of the proclaimed extra HP not being there. The guy I spoke with felt he had gained HP on his Q50 but also thought he gained HP by adding a grounding kit as well which I find hard to believe. I have on order the Z1 intake Plenum then will do the Stillen Pulleys

[Altered]

you can wedge a breaker bar against the ground and momentarily crank the engine if you are adventurous.

I hope no one actually tries this, definitely a recipe for disaster.

Someone here ran a 12.8 (was modded), I would say 13.4 + at all stock

I suppose that was a 5.6, my M37x ran 14.25 new; then 14.35 actually, I just checked and I did not get the same times as stock

Btw I didn't do the install myself I had it done, so I can't really give advice on what to look for but I would always suggest using the manufacturers recommended tools and procedures for minimum issues and maximum safety.

[Ilya]

Sounds like a waste of money.

You have to get one that are stock diameter but weigh less...those in theory should actually provide benefit as there is less mass to rotate. Engine should rev faster, etc.

Smaller diameter, aka underdrive, yes...those are a waste.

Even lighter is a waste in the grand scheme of things. It'd be money better spent to buy lighter wheels or, dare I say, go to the gym (something I really need to do). The engine is already quick to rev up and shaving a few ounces alone won't make a difference.

Save your money and spend it on a few tanks of gas.

I said 'in theory' for a reason. Some engines may have different results than others due to other factors :p.

[PostalsQ]

Do you think that these underdrive or lighter weight pulleys offer any crankshaft protection. Like for example the ATI or Fluidampr type crank pulleys? I'm not sure if it applies here to these vehicles. But for example. Some crankshaft pulleys have a certain amount of acceptable wobble. New Dodge Cummins fall under that category.

Oh... BTW. When I mentioned buying it from Z1Motorsports to gain as much N/A HP. Salesman said it wasn't necessary. So I'm assuming. It's kind of a bust for any real power gains.

[DredM56]

G and Z guys that actually race their cars have seen gains of .1-.2 in the 1/4 from pulleys. The VQ is internally balanced so they are fine. I'm still looking to find more info about the VK and have some made. The crank pulleys save several pounds not ounces. The rest of the set are ounces each.

[DFW2011M56S]

you can wedge a breaker bar against the ground and momentarily crank the engine if you are adventurous.

I hope no one actually tries this, definitely a recipe for disaster.

Someone here ran a 12.8 (was modded), I would say 13.4 + at all stock

I suppose that was a 5.6, my M37x ran 14.25 new; then 14.35 actually, I just checked and I did not get the same times as stock

Btw I didn't do the install myself I had it done, so I can't really give advice on what to look for but I would always suggest using the manufacturers recommended tools and procedures for minimum issues and maximum safety.

Density altitude can play a big part of that! Going from 3500 da summer air to -600 DA dropped my times nearly 7 tenths of a second. Going off 1/8 mile times my car ran about 12.8 stock!

[PostalsQ]

Thanks Dred. So there's a slight benefit to the pulleys. I was thinking about buying the stock size just for the mere weight savings on the motor. And along with everyone else's ideas. Theoretically it should allow things to spin faster due to less rotational mass. I was just worried about crankshaft balance.