Crank Pulley Installed - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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  #1  
Old 12-26-2007
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Crank Pulley Installed

I finally got it installed at my local Mazda dealer, I know the service manager and head tech. Cost $25 to install. Here are the 2 pics I took all I had was my blackberry. Its raining so I didn't to romp it but I can feel a little better pull at start off or either its my imagination, should I feel something different and at what RPM range?

Comments welcomed and encouraged.

Last edited by FORZDA; 01-27-2008 at 07:08 PM.
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Old 12-26-2007
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Congrats on doing what I think for the price is the best performance mod you can do.
You will feel it through the entire RPM range and you will especially feel it when you drive past the gas station. You will get better MPGs after you stop putting your foot in it.
Enjoy!!
Here is a thread I started on the subject.
http://www.rangerpowersports.com/for...d.php?t=210822






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Old 12-26-2007
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looks good clay, and 25 bucks it a steal. lol
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Old 12-26-2007
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Quote:
Originally Posted by zabeard
looks good clay, and 25 bucks it a steal. lol
I know.
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Old 12-26-2007
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very nice, but yeah all through the RPM range as its less weight to turn. I plan on doing that to much by truck but i want to get all the pulleys. I don't really think I'd need to get the alternator but I'd get it just so I can have them all match lol.
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Old 12-26-2007
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I will be purchasing all of them eventually I got to recover from Christmas first
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Old 12-27-2007
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I got quoted $150 for the install from a local mechanic so $25 is an awesome deal.
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Old 12-27-2007
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How is changing the crank pulley supposed to increase hp and fuel mileage???
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Old 12-27-2007
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Quote:
Originally Posted by 0sixsport
I got quoted $150 for the install from a local mechanic so $25 is an awesome deal.
WOW well I was quoted $75 before I went to talk to them at the dealership.

Quote:
Originally Posted by Ranger Carl
How is changing the crank pulley supposed to increase hp and fuel mileage???
I am unsure if this is correct but its how it was explained to me, smaller pulley doesn't have to work as hard. Now wait for an expert like Wayne to come in and explain it
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Old 12-27-2007
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Kinetic energy. Power to run the accessories.

Look at the link I posted it probably has an answer to most questions.
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Old 12-27-2007
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I appreciate the link however I am not a member of RPS nor do I wish to join another forum. I will await answers here. I did read thru it and it didnt answer alot of my questions
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Old 12-27-2007
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Quote:
Originally Posted by FORZDA
I appreciate the link however I am not a member of RPS nor do I wish to join another forum. I will await answers here. I did read thru it and it didnt answer alot of my questions

What are your other questions?

"should I feel something different and at what RPM range?"

That one was answered. Just wondering.
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Old 12-27-2007
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So changing a pulley gives more hp and gas mileage. On which law of physics do you base this?
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Old 12-27-2007
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Quote:
Originally Posted by vindex1963
What are your other questions?

"should I feel something different and at what RPM range?"

That one was answered. Just wondering.
I read it and now that I had the chance to drive my truck in better weather I do feel a difference, however I am still confused on how it saves gas, I will take your word for it though
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Old 12-27-2007
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Quote:
Originally Posted by FORZDA
I read it and now that I had the chance to drive my truck in better weather I do feel a difference, however I am still confused on how it saves gas, I will take your word for it though
Well theoretically it's the same concept of how much effort is required to turn the wheel of your truck in comparison to a wheel on a shopping cart just not quite that much of a difference.
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Old 12-27-2007
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Quote:
Originally Posted by Ranger Carl
So changing a pulley gives more hp and gas mileage. On which law of physics do you base this?
I can't quote physics but let me try to explain. You know how you can take a cordless drill and if you hold the chuck you can slow it down? Think of your hand as your water pump, alternator, Power Steering, Clutch driven fan and air conditioner.

Use that drill to drive a screw. Thats your wheels. Now take your hand and grasp the chuck while the screw is going in. It probably slowed down and will probably drain the battery of the drill faster. The reason is your hand is taking energy that otherwise would have gone into the screw.

It's not exactly that cut and dry as you aren't "removing" the hand from the chuck completely, you are loosening the grip.

The better explanation would be a before and after dyno. The pulley gained 8 HP and 11 torque. This was same day dyno run with an hour between runs as the pulley was installed while it was still strapped to the machine. Notice the gain is consistent from start to finish. No sweet spots like some other mods:

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Old 12-27-2007
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Thanks Wayne
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Old 12-27-2007
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Rich's thread has data log info. It's on a 4.0 but good info regardless:

https://www.ranger-forums.com/forum2...ad.php?t=34153
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  #19  
Old 12-28-2007
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So your saying the pulley is so much lighter than the stock pulley that it makes hp and torque.

Your wrong.

A light pulley or even flywheel will NOT make hp or torque.

If you use a lighter pulley and/or flywheel you will have faster acceleration of the engine to max. rpm. but there will not be a peak hp gain.

It takes hp to accererate the heavy pulleys or flywheel to speed so there is a loss during accereration but no gain on the max. output.

There is a noticable increase in accereration using a lightweight flywheel and you don't need a dyno to feel the difference. I have felt the difference on my own cars. There is still no max. increase of hp, only more acceleration.

I seriously doubt that taking maybe a pound of weight off a flywheel pulley would produce an improvement in acceleration that even a dyno with instrumentation to produce a curve display would be able to detect. You sure won't feel it on the road. It's all in your imagination.

Now, if your power and torque curves had shown a faster acceleration rate but the same peak power and torque then your claims may be valid. That is, as long as your claim is not unreasonable.

Your current claims are unreasonable and invalid.

And yes, I have run dyno tests on chassis and engine dyno,s and know and understand hp and torque curves and acceleration rates.
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Old 12-28-2007
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Carl the pulley is also a different size.

Its not making HP it is freeing used HP. HP that was being taken up by the accessories on the engine.
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Old 12-28-2007
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Quote:
Originally Posted by Ranger Carl
So your saying the pulley is so much lighter than the stock pulley that it makes hp and torque.
It's a 20% underdrive is why it makes power.
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Old 12-28-2007
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Quote:
Originally Posted by Ranger Carl
Your current claims are unreasonable and invalid.
They are uderdrive pulleys that spin the accessories slower. You're putting the gains on a weight reduction only.

The assumption can be made that I am biased since it IS my product. I posted a before and after dyno. There have been other dyno runs made that support the same thing. A search on RPS would find them. I also Posted a link to Rich's thread. I haven't found anything that would lead me to believe they are invalid.

I would say Jusnes / Bama chips reported they only got 4HP from a 4.0 pulley and they felt is wasn't worth the money. With that 4.0 pulley I gained 8 and rich gained 12. Because of the variances I generally don't post that one up, but give 8 -12 HP number when people ask (the manufacturer claims 16HP btw). I would be in my right to get on here and claim 16 HP but I don't and I won't. With the 3.0 I have found NOTHING that leads me to believe they are incorrect.

As far as weight reduction and it's impact. I have made posts with my best guesses. With my 3.0 water pump pulley (which is the same size as stock so there is no extra reduction on speed) my basic response in Quantifying any gain- it's the equivalent of taking 17 pounds of dead weight out of your truck. This is based on research I did on the different weights (regular weight, unsprung weight, and rotating weight). I came to the conclusion that 1 ounce of rotating mass was ruffly the equivalent of 1 pound of regular weight (spare tire, junk in your bed, etc) i don't think anyone would consider that an outlandish claim. It's realistic based on the research I have done.

I hope that clears up "invalid and unreasonable" as that confused me since I post my results as well as others. I now added the negatives as reported by Jusnes/Bama. I've also posted my claims compared to the manufacturers and I report MY data, not theirs. I'm not gonna go into seat of the pants improvement. I think you would agree those results are gonna be all over the map, from didn't feel anything to being the equivalent of a supercharger.
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Old 12-28-2007
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Jeeeze, you think someone would research a little before just coming out and saying you're wrong. By reducing drag on the engine, you aren't producing any extra hp, you are more efficiently using the hp the engine already produces.

The closest law would maybe be newtons 3rd law? But that would really only be applicable if you were adding hp.
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Old 12-28-2007
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Graniteguy, so you are putting a smaller pulley on the crankshaft and by doing that your claiming a hp increase by reducing the paracidic hp on the engine. Is that right??

I think Jusnes and Bama's results were generous and I think a 4 hp gain would be max. without modifying the engine or fuel system.

In trk straight line full throttle acceleration the A/C is turned off automatically, the P/S is very low parasidic hp, the alt. parasidic load is determined by how many amps it is putting out (no output=very low drag), the water pump is a constant on a curve with the rpm of the pump, fan depends on if fan is locked and driven and load will vary with engine temp.

Yes, a two to four hp gain under certain conditions is posible. Your loosing cooling and alt. output not to even mention the lowered output of the other accesories.

I don't think it's a good idea to reduce the pulley size unless you are building a hot street racer. For a stock engine it's not a good idea. The racer will be geared lower and turning higher revs. to compensate for the smaller pulley.

Well, if it makes someone feel like they have more power then that's what counts I guess. Rest assured you won't FEEL a 4 hp gain. 10 maybe. 20 yep. I doubt you'd see 4 hp gain as better times on the strip given all the variables of track, tires, reaction time, etc.

Last edited by Ranger Carl; 12-28-2007 at 12:30 PM.
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Old 12-28-2007
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lol. Yes. It's a 20% underdrive pulley. I don't know what else to add other than I'm just curious if you think I "cheated" the dyno data. Thats what it comes down to. I sell 200 products (?) and I only make one claim on my site. The 3.0 pulley is good for 8hp and 11 torque. I don't provide the data for anything else be it an intake, header, etc etc. Some would translate that into me not shooting off my mouth and making claims that are unverified, you call it "unreasonable and invalid".
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