Im looking for puleys for my 87gxl na... i found a nice set at mazdaracing.com for $129.00.. they look very nice and they have posted dyno results of 14.4hp increase on a bone stock car. here is a link to the page.
http://www.mazdaracing.com/pulley.htm
im looking at the street series pulley system,(blue)
i was just wondering what everyone else thought of this product and if i should be shopping somewhere else.
thanks -ben

 

hmm

 

yea, id like to hear from the experts about this =]

 

theres no way i could believe that unless i was there, watched them dyno, then take off the stock pullies and put those on, then dyno again. There is just no way those pullies bump up hp 10%. Seems like a rice trap to me. (ie electric superchargers adding 20 hp, or catback exhaust on stock honda 1.6Ls adding 25hp.)

 

so wait, im to belive that 2 less pounds of rotating weight will give you 14 hp? sounds fishy to me

 

Pullies do work, but DON'T get the Mazda Racing ones(unless you like dead batteries, luke warm A/C, non-functional powersteering, and the like). They're not ideal for street driven cars that have high electrical loads. THEN there'salways the issue of your water pump cavitating...

Steve

 

news flash, an under driven crank pulley prevents water pump cavitation at high rpm.

 

Id rather lighten my own pullies with a drill press. ghetto style lol Besides I only have the last part which is only two belts and can't weigh more than 1-2 lbs itself. I doubt that **** about 14.4hp or whatever it was is true because that would mean I got that much too so therefore I am somewhere in the 160-170whp range instead of 140-150 lol.

 

underdrive pullies free up horsepower. by spinning the accessories slower u free up alot of horsepower cuz the motor doesnt have to work as hard. big gm v8s usually get more hp than that.

 

lt1s in stock trim usually pick up about 5-7hp, and thats on a 275horse 325 tq motor

 

I got both the main underdrive and dual altenator pulley, its not a 14hp gain at all.

 

hahha hey maybe if u do drill ur pulleys and lighten them up like cray ull gain powa!!!!

but 14hp? 14rwhp?

hmmm....

 

Underdrive pulleys are a bad thing. I would get over drive pulleys before I got under drive!!!

Slowing your pulleys down will change the water pump altenator and power steering......all for 14 hp?? As we all know that is a bostrous figure... Invest the money in real power and reliability mods.

 

^it's suppose to slow it down? I thoght make it spin faster! less drag! less weight!

 

The way the pullies save you horsepower is not from weight alone, the diameter is different as well. And the MR ones are dyno proven for 12 hp on an 87 TII. So take that for what it's worth.

Steve

P.S. Jon, you're right, my bad.

 

Pulleys work, Im not sure if those ones cause problems, but I have some pulleys on mine and the alt and a/c work fine. If pulleys didnt work, then why do so many companies make them? And why do so many racers use them?

 

the 95 240SX did gain like 10hp from pulleys. its the the import tuner power pages.

 

the factory water pump has a bad cavitation problem. this menas that it basicaly vibrates and makes air bubbles in the coolant system at high rpms. getting an underdrive pulley system greatly reduces this. thus making a better coling system for high rpm use. that alone is enough reason to buy one not to mention the fact that u pick up some hp. also it doesnt slow them down enough to cause the alt to not charge enough unless u drive below 2k rpms the whole time.

 

so where is the best place to get them?

 

a/c? p/s?? lol if you get rid of both of these, there's a little more hp, less weight, and 2 fewer pulley's you need to buy. just my opinion.

 

Like I mentioned in another thread - those guys are full of ****.
There are a lot of wrong info all over their website.
I'd like to see another FC that is privately owned produce power gains with their pulley swap.


-Ted

 

The factory pump does not have a "bad cavitation problem". Like all OEM water pumps, it was designed for street use. More specifically, the pulley sizes were optimised for street use. On the street the water pump does not have any problems with cavitation. There is no need to undersize the water pump pulley unless you spend long periods of time at high rpm, i.e. a race car.

An undersized pulley reduces the capacity of the cooling system because the pump is turning slower. That's a plain fact. So at the average engine speeds seen while driving on the street you have increased the chances of overheating without seeing any of the high-rpm benefits of the pulley. A couple of extra peak hp from an underdrive pulley (and that's all you can expect) is not worth that risk.

 

I definately agree with what everyone else is stating... theres no proven facts that say these pullies will give you some hp. I could start a website that says my 1.8L non-turbo automatic eclipse can run low 13's on snow tires.

Thats definately one problem with the internet, with the good comes the bad... even more so when it comes to information. Good ol' marketing to come back for you... First it was your TV, now its your internet.... next its in your sleep.... Hmm sleep sounds good right about now...

Id say the only things those pullies might do is make your engine bay look colorful.

 

jason you dominate people on this forum like its your job

 

Just sharing what I know.