| Hilbe |
I just talked to the guys over at Unorthodox Racing. They say the light weight crank pulley (Ultra Sc) part 021011012 will fit on the Murano. It supposedly gains 2.7hp per lb over the stock. This is just a stock replacement....so no need to replace belts.
http://www.unorthodoxracing.com |
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| GripperDon |
| Accel faster, Less rotating mass, so rougher feel. |
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| Gonzo |
| Don't do it to the VQ.... no no no. |
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| ekaxel |
| Another wonderful mostly useless mod.... |
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| Hilbe |
quote:
Originally posted by Gonzo
Don't do it to the VQ.... no no no.
Why not? The VQ is internally balanced...
I'm not doing it to the Murano, I just asked for the heck of it... |
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| Kris |
| As Don said - you have less rotating mass, less inertia, but absolutely no HP gains! This "modification" would be nice if I drove F1 car. But for Murano - useless. Sorry to disappoint you, but you cannot change physics... |
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| njjoe |
quote:
Originally posted by Hilbe
It supposedly gains 2.7hp per lb over the stock.
H-
It may make the engine rev slightly quicker but it will not add horsepower.
-njjoe |
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| Kris |
quote:
Originally posted by njjoe
H-
It may make the engine rev slightly quicker but it will not add horsepower.
-njjoe
Joe,
actually engine will not recv quicker, it will reach top revs quicker, assuming load will allow for that....... |
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| njjoe |
quote:
Originally posted by Kris
Joe,
actually engine will not recv quicker, it will reach top revs quicker, assuming load will allow for that.......
Is that not one in the same?
-njjoe |
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| SIM |
| Probably on neutral it could be quicker to reach 5800 RPM but what about under load? With 700 pounds less than the MO, the 350Z is in the lightweight division. And also do not forget that advertised numbers are usually for the 350Z VQ which is different enough from the MO's to produce 60+ more HPs coming out of the assembly line. |
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| Kris |
quote:
Originally posted by njjoe
Is that not one in the same?
-njjoe
Joe,
I guess it is all down to semantics...;)
Anyway, to be precise the lightweight internals allow for higher "angular accelerations rates"....or something to that exend...
but definitely no HP gains! |
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| Tyler_Canada |
I've always wanted a UR lightweight pulley, but it was too much money for the benefit. If I had to replace the pulley for some reason, I would use a lightweight.
You will not create more HP at the crank, but you will free up HP that can be used at the wheels (only during acceleration). I expect it to have a similar effect to the intake (barely noticeable). Also, you will get a more pronounced engine braking, as there is less inertia keeping the RPMs up when you let off the throttle.
Little things like this may not make a vehicle much faster, but not everything is about speed. If an intake and lightweight pulley improve throttle response, that is a worthwhile benefit too. |
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| Eric L. |
If in the best case scenario you gain 2.7hp, is that even noticable? I mean, you can find a 2.7hp differential just from ambient temperature alone (say a cool morning vs a hot afternoon), so I'm not sure such a small gain (if it exists at all) is a worthwhile mod. But to each their own.
Also keep in mind this is an UNDERDRIVE pulley - it will spin your accessories slower - this means less boost to the AC compressor, PS pump, and water pump. Whether this is a measurable difference I do not know, but I am not willing to sacrifice even 10% of my AC performance for 2.7hp. |
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| ekaxel |
Ebay has a wonderful assortment of portholes. which you (and more importantly everyone else) can SEE!
I don't know, but maybe a 0.1% HP increase??? |
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| Tyler_Canada |
quote:
Originally posted by Eric L.
Also keep in mind this is an UNDERDRIVE pulley - it will spin your accessories slower - this means less boost to the AC compressor, PS pump, and water pump. Whether this is a measurable difference I do not know, but I am not willing to sacrifice even 10% of my AC performance for 2.7hp.
Actually it's just a lightweight pulley. Unorthodox Racing makes both. |
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| Eric L. |
quote:
Originally posted by Tyler_Canada
Actually it's just a lightweight pulley. Unorthodox Racing makes both.
Ah, my bad. Sorry for the confusion. In my Maxima days, a bunch of folks had the underdrive pulley. |
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| Hilbe |
quote:
Originally posted by ekaxel
Ebay has a wonderful assortment of portholes. which you (and more importantly everyone else) can SEE!
I don't know, but maybe a 0.1% HP increase???
Where does it say it'll be that low? The link I provided says:
03-06 MURANO 3.5L DOHC 24V - AWD,FWD - AUTO,MANUAL TRANS - 8-12HP |
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| Eric L. |
quote:
Originally posted by Hilbe
Where does it say it'll be that low? The link I provided says:
03-06 MURANO 3.5L DOHC 24V - AWD,FWD - AUTO,MANUAL TRANS - 8-12HP
8-12hp from a pulley? No way. If it was that easy, it would be standard on every Murano. Forgive my skepticism, but do you really think this tiny change will give that much power? Even an intake and full exhaust would barely get this much, much less just the pulley itself. |
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| njjoe |
Hmmm... an 8 to 12-horsepower increase by simply replacing the stock pulley with a lightweight pulley? Who are they trying to kid?
But you know what? These will pop-up on eBay and people will buy them. And thanx to the placebo effect they will swear their MOs are faster, quicker, more fuel-efficient, will reduce wrinkles, eliminate erectile dysfunction, and reverse male-pattern baldness. What a deal.
-njjoe |
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| crashdump |
look at it this way.
how many millions did Nissan spend testing there engines and the components.
and how much do after market parts manufacturers spend?
that should answer it heh |
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| SIM |
quote:
look at it this way.
how many millions did Nissan spend testing there engines and the components.
and how much do after market parts manufacturers spend?
that should answer it heh
In all logic it should. But logic is not evenly distributed... :2: |
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| Tyler_Canada |
| But what is cheaper to make? A solid pulley, or one with a bunch of "speed holes"? The lightweight pulley will cost a few cents more to make, and there's no way Nissan would spend that! |
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| crashdump |
if Nissan could gain 2.7 horsepower just by putting holes in an aluminum pulley they probably would have. my guess is it doesn't affect the overall gas mileage of the engine and that why they don't?!?!?
I dunno I am still mad my Murano gets 19.5 on the highway. my old 98 dodge dakota r/t with a 5.9l engine and 3.90 gears got 14.3 after some tweaking here and there. and my mo only gets 5 more mpg.
should be alot higher imo.
if i thought a pulley or a resistor in a fancy box would help i would use it.. |
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| njjoe |
quote:
Originally posted by crashdump
if Nissan could gain 2.7 horsepower just by putting holes in an aluminum pulley they probably would have. my guess is it doesn't affect the overall gas mileage of the engine and that why they don't?!?!?
Cutting weight is not always advantageous. Adding weight to a rotating mass can be used to reduce vibrations in the assembly.
-njjoe |
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| njjoe |
quote:
Originally posted by Tyler_Canada
But what is cheaper to make? A solid pulley, or one with a bunch of "speed holes"? The lightweight pulley will cost a few cents more to make, and there's no way Nissan would spend that!
TC-
The crankshaft pulley on your MO has 4 holes cast in it. Casting additional holes would not have cost anything more.
-njjoe |
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| Tyler_Canada |
quote:
Originally posted by njjoe
The crankshaft pulley on your MO has 4 holes cast in it. Casting additional holes would not have cost anything more.
Thanks for pointing that out. Then my guess would be the vibration reduction is what they were aiming at with the weight they chose. Also, a heavier the pulley has more inertia (which is why it helps with vibration), which will also make you feel it less when say the A/C kicks in. You get slightly less engine braking with a heavier pulley. |
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| moforose3 |
quote:
Originally posted by ekaxel
Another wonderful mostly useless mod....
Every car I have seen this done on makes more power (including my 350z that I just traded in on my Murano) , how is this useless? |
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| njjoe |
quote:
Originally posted by moforose3
Every car I have seen this done on makes more power (including my 350z that I just traded in on my Murano) , how is this useless?
mf3-
You installed a lightweight pulley on your Z and it produced more power? How did you verify the increase?
-njjoe |
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| moforose3 |
| I got it dynoed. Id have to call my speed shop to see if they saved the charts, but for that part I believe it was right around 6 whp |
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| b0xdesigns |
| It helped a bit. |
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| njjoe |
quote:
Originally posted by moforose3
I got it dynoed. Id have to call my speed shop to see if they saved the charts, but for that part I believe it was right around 6 whp
M-
I find that very hard to believe. A 2% increase in horsepower by simply taking maybe half a pound from a pulley? It may be true, but I just can't picture that. I think we need Homer for this one.
-njjoe |
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| black03specv |
| I have one on my SpecV and noticed increases as well. Not so much with power (never dynoed) but it definitely rev's quicker. I also noticed that the A/C blows colder and the engine shows less of a performance decrease when the A/C is turned on. |
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| njjoe |
quote:
Originally posted by black03specv
I have one on my SpecV and noticed increases as well. I also noticed that the A/C blows colder
That can definitely be attributed to the placebo effect. A lightweight pulley will have absolutely no effect on the A/C's output temperature. The engine is going to run at a specific RPM at idle and for a given vehicle speed regardless of the pulley mass.
-njjoe |
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| SIM |
| Joe is right. It is the ECU that controls the engine speed. It will always idle at same speed but it will burn more fuel doing so if it is harder to stay at that speed. So, essentially, this pulley is a gas saving device. How much gas though? |
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| moforose3 |
| These have been around forever, I dont know why this seems like something new. Pick up any car magazine and check out the "tuning" pages and you will see pulleys being dynoed now and again. |
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| NyLife |
| i had them on my 1997 a4, it helped with engine reving easier, but thats about it |
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| Hilbe |
I got the Cosmo Racing UDP last night from here:
http://www.cosmoracing.com/producti...id=199&pid=1324
Essentially it does not under drive the alternator or a/c, but it does under drive the power steering. It requires 1 new belt ($15) for the power steering which is a Gates K040300 (30.75" or 780MM).
I am installing this one in my Maxima (fits both Murano and Maxima). If all goes well, I will order another for the Murano and get it installed as well. They run $68 shipped plus the $15 belt.
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| Eric L. |
quote:
Originally posted by Hilbe
I got the Cosmo Racing UDP last night from here:
http://www.cosmoracing.com/producti...id=199&pid=1324
Essentially it does not under drive the alternator or a/c, but it does under drive the power steering. It requires 1 new belt ($15) for the power steering which is a Gates K040300 (30.75" or 780MM).
I am installing this one in my Maxima (fits both Murano and Maxima). If all goes well, I will order another for the Murano and get it installed as well. They run $68 shipped plus the $15 belt.
[
Hopefully you have one of the MO's with the boosted power steering pump, else you'll have even less steering assist if you have to turn the wheel hard over at low speeds. Do a search for "Murano steering issue" if you are unfamiliar with this problem on early Muranos. |
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| Hilbe |
quote:
Originally posted by Eric L.
Hopefully you have one of the MO's with the boosted power steering pump, else you'll have even less steering assist if you have to turn the wheel hard over at low speeds. Do a search for "Murano steering issue" if you are unfamiliar with this problem on early Muranos.
I have a year end 2004 model... |
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| Eric L. |
quote:
Originally posted by Hilbe
I have a year end 2004 model...
It is likely you are ok then, but Consumer Reports noted that the change started in 2005. Maybe some late 2004's also had the modification. |
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| Hilbe |
quote:
Originally posted by Eric L.
It is likely you are ok then, but Consumer Reports noted that the change started in 2005. Maybe some late 2004's also had the modification.
Do you have a specific post you can show me that can help me determine if I have an issue or not? |
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| njjoe |
quote:
Originally posted by Hilbe
Do you have a specific post you can show me that can help me determine if I have an issue or not?
H-
If you had the problem you most definitely would know by now. :p
-njjoe |
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| hfelknor |
Just take it to a parking lot or some big empty field.
Proceed straight ahead at maybe 5-10 MPH and suddenly whip the steering wheel FULL Left or right.
If your power steering quits before you hit the steering stops, you have the original power steering and this can be very dangerous in accident avoidance.
(It also cripples my parallel parking technique.)
If you have this issue, i would be very wary of doing anything in or around the power steering.
I would think that you DO have this problem.
if, OTOH, you just whip the wheel all the way to the stop without incident, you are good to go.
Homer |
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| Eric L. |
quote:
Originally posted by Hilbe
Do you have a specific post you can show me that can help me determine if I have an issue or not?
You can use the search feature. |
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| Eric L. |
quote:
Originally posted by hfelknor
Just take it to a parking lot or some big empty field.
Proceed straight ahead at maybe 5-10 MPH and suddenly whip the steering wheel FULL Left or right.
If your power steering quits before you hit the steering stops, you have the original power steering and this can be very dangerous in accident avoidance.
(It also cripples my parallel parking technique.)
If you have this issue, i would be very wary of doing anything in or around the power steering.
I would think that you DO have this problem.
if, OTOH, you just whip the wheel all the way to the stop without incident, you are good to go.
Homer
To add to homer's post, I find this issue crops up on my MO not when I go full lock to one side, but when I go full lock then turn back opposite lock, and that total steering seems to use up the reserve of steering boost. It doesn't have to be full lock either way, but like homer says, it happens when parallel parking since you usually do a quick right-left with lots of lock when backing in. |
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| Hilbe |
Well, I got the Cosmo Racing UDP installed yesterday on my Maxima. Huge difference. The thing revs a very noticeable amount quicker and feels a lot more peppy. I am not sure if I can tell the HP increase or not, but I am definitely glad to have purchased this item.
I am probably going to wait out the warranty on the Murano before I decide to put the Cosmo Racing UDP on. I've got 26k miles on the Murano and 56k miles on the Maxima, so it may be a while. |
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| nightghost |
just i want to know did u fix the underdrive crank pulley or Stock Diameter crank pulley ?
cause i want to buy one just i want to know which one is better and can give me more HP or different. |
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| njjoe |
nightghost-
A lightweight pulley does not enable the engine to generate additional horsepower. It just enables it to rev slightly quicker.
An underdrive pulley frees up horsepower by driving the accessory drives (alternator, power steering pump, A/C) at a slower rotational speed for a given RPM. However that means you have less electrical power and steering boost at any given RPM. Is that really a good idea? After all, the MO will never be a rocket, not as long as the power is routed through the JATCO CVT. An undersize or lightweight pulley is more window dressing than anything else.
-njjoe |
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| Hilbe |
quote:
Originally posted by nightghost
just i want to know did u fix the underdrive crank pulley or Stock Diameter crank pulley ?
cause i want to buy one just i want to know which one is better and can give me more HP or different.
I'll probably get the underdrive since its cheap. The stock diameter pulley is around $200 and the underdrive can be $75 or so... |
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| ekaxel |
"An undersize or lightweight pulley is more window dressing than anything else."
But you cant see it! Does it come with decals? |
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| Hilbe |
quote:
Originally posted by ekaxel
"An undersize or lightweight pulley is more window dressing than anything else."
But you cant see it! Does it come with decals?
Says who? I see mine every time I lean over the engine from the passenger side or change my oil :) |
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| Eric L. |
Without a dyno test, there is no way to tell whether an underdrive pulley is worth the expense (it doesn't matter if its $75 vs a $200 stock pulley - you don't have to pay for a stock pulley since it came with the car).
Let the guy have his mods if he likes it. |
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| Stu |
2.7 HP increase? You can get more variation by just running your engine on consecutive pulls on the dyno!
Also, 2.7 HP is below the accuracy threshold of most dynos. 2% accuracy at 200 HP is 4 HP.:D |
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| njjoe |
quote:
Originally posted by Stu
2.7 HP increase? You can get more variation by just running your engine on consecutive pulls on the dyno!
Also, 2.7 HP is below the accuracy threshold of most dynos. 2% accuracy at 200 HP is 4 HP.:D
Yeah, but that doesn't matter with the Marketing departments. They'll take the absolute maximums and publish those figures in bold-face type. And sometimes the next guy will take the number and round it up to the next whole number, 2.7 becomes 3. And then the next guy will round it up to the next multiple of 5, and 3 is now 5. It's amazing how these marketeers work.
I especially love when they claim "gains of up to 25 horsepower or more". Or more????
-njjoe |
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| Eric L. |
| 2.7hp extra horsepower on a 4000lb vehicle will be imperceptable. To be honest, you can get that extra power just by stepping on the gas harder and revving the engine higher than you normally would. The extra cost in gas (to tap a few dozen extra RPMs for ~3hp) would be cheaper than replacing the pulley. But, if modding makes someone feel better, then I'm all for it (part of owning a car is personalizing it, even with mods that don't add that much to performance). |
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| jbtech |
Hello to everybody,
My name is josh. With a recent addition to the family my wife an I are looking to add a Murano to the household to cart the kid around. Being that I have the same "tuning sickness" that everybody else on this posting board has I had to see how I can tweak the murano when we get it.
I noticed after reading the post that most people think that you only get 2.7 hp by adding this mod. But noticed in the original post that it is 2.7 hp per pound . So if it is lets say 3 pounds less then it would be about a 8 hp gain. Now i don't have the specs on both pulleys to compare the two but I would assume it is most likely more then a pound lighter than the stock pulley. Just putting in my 2 cents |
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| moforose3 |
quote:
Originally posted by njjoe
nightghost-
A lightweight pulley does not enable the engine to generate additional horsepower. It just enables it to rev slightly quicker.
An underdrive pulley frees up horsepower by driving the accessory drives (alternator, power steering pump, A/C) at a slower rotational speed for a given RPM. However that means you have less electrical power and steering boost at any given RPM. Is that really a good idea? After all, the MO will never be a rocket, not as long as the power is routed through the JATCO CVT. An undersize or lightweight pulley is more window dressing than anything else.
-njjoe
Seriously now, have yo uever modded a car or read a performance magazine? These things will make more power on almost every engine. Look in the power pages of import tuner magazine, sport compact car, superstreet, muscle car, camaro, etc., etc. and they have these installs all the time with dynos before and after. All of these guys are showing increases on the dynos and all of these guys that have had shops for years are using these modifications. How are they getting these results repeatedly if they really arent doing anything. Im not trying to be an ass, I just dont understand where you are getting your info. |
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| ekaxel |
| Most "modders" don't do their work on modern computer controlled engines. For the most part, they don't care about emissions, only horsepower/torque/noise! |
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| Eric L. |
| Folks - before we get into arguing here, I think the facts are that this mod will free up some horsepower, but probably not so much that it can be noticed IN A MURANO (we're not talking a hot rod here). The CVT also dampens the performance feel as well. But there is no doubt that if the engine has to spin a lighter pulley, it has less parasitic load (how much is not really known though unless someone has dynoed' pre-mod and post-mod). |
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| moforose3 |
quote:
Originally posted by Eric L.
Folks - before we get into arguing here, I think the facts are that this mod will free up some horsepower, but probably not so much that it can be noticed IN A MURANO (we're not talking a hot rod here). The CVT also dampens the performance feel as well. But there is no doubt that if the engine has to spin a lighter pulley, it has less parasitic load (how much is not really known though unless someone has dynoed' pre-mod and post-mod).
Very true to all of the above. I definitely agree with the "IN A MURANO" quote also. The thing wasnt meant to be fast, and it would pretty much be pointless to make it fast. |
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