Just ordered MRZ performances underdrive pulley. excited to see how much it will do......i will keep everybody updated

 

Excellent. Good luck.

 

thanks

 

Subscribed -- looking forward to your findings!

 

cool man, hope you get a noticable difference with it.

 

somebody told me that accessories suffer from lighter pullies... true or no? anyone

 

I think the accessories will only suffer if you have a big sound system. MRZ said that the stock setup shouldn't suffer. I guess we'll see though.

 

lol not too worried about sound system

 

Great to hear.

And accessories dont suffer but your alt wont be as efficient.

 

yeah, i'd like to see how well the air and **** works with this mod.

 

why wont it be as efficient? its still spinning the same amount of time, its not like the pullies are smaller? i just dont understand why it would

 

Subscribed. Make sure to make a How To.

 

If he got the actual underdrive pulley it is smaller:
They do have a lightweight one though...and it has the same diameter as stock.

Let us know if you see a difference!!

 

oh, that is what i didnt see, that it was actually smaller. well if i get it i am going to get stock size

oh and when you keep the normal opperating voltage in a car it helps better with ignition and sending pulses for fuel system etc...

 

Yea...that's true...but I wonder how much the alternator is actually affected.

 

probably not enough to drop you if you dont have a powered system (stereo) but i would like to wait for someone to do it and post voltage before i attempted it

 

I've ordered the lightweight one. I will hopefully have it installed within 2 weeks

 

If you ordered the light weight one that maintains the original OEM size, all accessories will work fine, alternator will work just as before and you will notice a slight difference in acceleration. I purchased one about five months ago, not from MRZ. It worked great, however it must not have been the correct diameter or just slightly off, not sure which, I just know the one edge was worn away and it caused a slow oil leak. I took it off and put my original back on (Oil leak stopped) and boy could I tell a difference. Now, it almost seems heavier when accelerating, I plan on purchasing a new one from MRZ soon.

 

The one that is lightweight but with OEM size is for the 2.0 though.

 

So are the ones for the 2.2 and 2.4, I got ahead of myself before not realizing this was a thread for 2.2, but hey a Cobalts a Cobalt right. Here, directly from MRZ's site:

"Here they are, the new MRZ Performance Lightweight Crank Pulleys for the 2.2 and 2.4 NA Ecotec's! Same diameter as OEM, but 2.5 times lighter than the OEM cast iron GM pulley!"

 

They have one for the 2.2 and 2.4 (5 Ribs) that was just released
The 2.0 Ecotec has 6 ribs

 

Weird. I thought the 2.2/2.4 was only underdrive. Hmmm. I guess I need my eyes examined. lol

 

they offfer underdrive and OEM size for all models, they actually have the 2.2 ones(underdrive and oem) in the mail right now coming to me

 

Just saw them on their site. Its good to have a choice between the two.

Jn2, when do you have the dyno scheduled?

 

sceduled it fro friday and saturday, but they barely shipped it today from canada, will take about 5 days, so it prob wont be till monday or tuesday depending when they arrive