Hey guys. I'm currently running GM stage 2 on my 06 ss/sc. I was reading about the 2.79" ZZP pulley and it says that it works perfectly on stage2 kit ss/sc's. They pulley is only about 70 bucks shipped (cobaltaddiction). I was wondering if any of you have this current setup (stage 2 plus 2.79 ZZP). If so, how does it run? How long have you had it? Is it reliable? How risky is it to messing up my car? Also, do I need to purchase the ZZP adjustable belt tensioner to make this setup work? Are there any additional parts that I may need? Sorry for so many questions. I just like to know what I'm getting into before I start unloading money on my ride.

 

stay stage 2, get it hp tuned, get HE, get meth, get all supporting mods and you will have a low-mid 13sec car thats DD and will not blow up in the years to come.

 

You wouldn't need any extra stuff but most people don't recommend going below 2.9 with the GM tune.

 

If your gonna go with 2.79 then it would advantageous to go with 60lb injectors because there is talk about the injectors going static with a pulley that small....

 

mkurley13 would it really be a low 13second car? I have no clue about 1/4mile times on these cars.

I am looking to switch to 60lbers and a 2.7inch pulley along with everything in my sig and an amazing dyno tune from my favorite dyno shop. What do you believe I would run 1/4mile if I am an "average" driver. Nothing amazing, but not terrible.

I will also be adding the ttr poly tranny mounts. Incase that helps at all.

To the OP:

I apologize about going off topic. If you use a pulley that small, without cooling mods, you are asking for trouble. Your injectors will be going static. The GM Stage 2 tune is VERY rich. I am talking about mid 9s instead of mid 11s where it should be.

DO NOT grab that pulley and put it on without adding cooling mods, and getting another tune or you will be waiting for your motor to go.

 

What do u mean by "getting it hp tuned"? What exactly does this entail? The other supporting mods that I have in addition to my Stg2 are: AEM CAI, GMPP exhaust, Hurst short throw. I really don't think there's much else out there that I can get to make a significant bump in HP unless I go with a higher stage kit. I thought about an exhaust header, but this will just make the car even louder and only gain like 3hp (already too loud with the GMPP perf. exhaust).

 

Might want to get that pulley from Nate from what i seen zzp pulleys are 5 bolts and if you got the gm stage 2 like me you got a 4 bolt hub so, Smoothflowpulleys.com is the way to go i have his 2.8 on the gm stage 2 and it's geat just get colder plugs!

 

2.8 runs great max out injectors a little before 7k. 2.7 would require 60lbs and a tune, you can run it on a stage 2 tune but it runs lean and max at around 6k but the boost is quite insane.

You don't need to change the tensioner, little slip with 2.7 but not with 2.8. I ran a 2.8 for more than 10k miles (a year and a half) with no issues then my pulley had an accident so it needs to be replaced...back to stage 2 oem for now but not for reliability issues.

You can buy from nate he makes good pulleys for 50 bucks.

That means someone accesses your pcm with the hptuners soft/hardware and changes the parameters then writes the calibration to your pcm.

Actually a header/downpipe change should net you about 10hp even with a cat. It shouldn't make you're car any louder unless you have an exhaust leak...maybe it will make it a little bit louder.

 

hahah so you're telling me that you can run a 2.8 inch pulley, or even a 2.7inch with "a little belt slip" on the stock gm stage 2 tune with 42lbers. Thats bullsh!t. Your injectors would be so damn static that its not even funny. Theres no way that if you have a decent amount of power that the stage 2 tune can hold a 2.8inch pulley without going static. I would LOVE to see some IDC's in the 80% or lower, hell even 100% or lower, with a stage 2 tune and a 2.8 inch pulley.

I don't buy that for a minute. Don't run a 2.8 inch pulley on the stock tune, and don't do it without all the cooling mods.

 

Yeah...me and a hundreds of other people must be full of crap. You're right everyone else is wrong, we'll be sure to build a monument in your likeness as a testament to your greatness. You're the guy who got the 2.93 pulley because you heard the 2.9 pulley would blow up your engine right?

 

please stop giving bad advice out...look at some logs and you will see how hazardous it is to run that pulley on the 42's and gms2 tune.

 

it is a little dangerous running a 2.9 with gms2 tune. im at 99% IDC's with 42's and a 2.9 at sea level. depends on your sea level really.

 

Ok, I'm lost lol. Guess that this discussion is above my head. What is an IDC? Really is there a way to run a smaller pulley on the GM Stage 2 without screwing up the car? I'm just looking for more power. I've got all the "small mods" (cai, exhaust, shifter) along with stage 2. Just looking for another bump in power. Please guys, I want honest information from people with knowledge and experience. I don't wanna mess up my car. Which pulley is gonna do the job safely? 2.7, 2.8, 2.9??? Ahhh I'm lost!

 

IDC is short term for Injector Duty Cycle. Definitely NOT a 2.7. You may be able to get away with a 2.8 but to be the safest just go with a 2.9. I have been running a 2.9 for 18,000 miles now with no problems and I am at sea level.

 

is there much of a difference between the stage 2 pulley and a 2.9...performance wise?

 

yeah there is, boost comes on a lot quicker...but i see you have no aftermarket exhaust so stay with the stage 2 pulley unless you want to hear excessive amounts of knock in your engine

 

theneelster - no, i am still on the stock stage 2 pulley. That was a different guy, I read that thread and laughed, but do understand that he wants to be "different" lol even if its by .03 haha.

My main point is, in my personal opinion, it is only SAFE to add a smaller pulley once you have done the cooling mods, plain and simple.

 

x2....alls I have to say is whoever started this thread don't be dumb and throw a 2.7 pulley on their with the stage 2 tune...worst thing you could do...look at raillist he has ran a 13.6 on a "STOCK PULLEY"...alls he has is cooling mods and an exhaust.

I hate how people think lets throw a small pulley on their and we will make a ton of power...you have to have cooling mods and a good tune if you actually want to use that power.

 

Exactly. 007Buff and ralli, and I all agree. There are some variables that come into play but some things are just plain and simple to see. If you run a VERY small puley such as a 2.5, or a 2.6 or a 2.7 on 42lb injectors on a stock stage 2 gm tune with NO cooling mods, in time something will break. I don't care where you live, or what temp it is outside, something will break. Period. The GM stage 2 tune is so rich that it puts some cars into the 9s, like mine.

The question is to the op, what are you really looking for. More power, or quicker times? Because they really are 2 different things. If you want more power then I recommend you do the following.

Header, Downpipe, Cat, custom exhaust, or exhaust of choice, heat exchanger, dual pass end plate with option b, methanol kit.

With that being said, you will be able to gain MUCH more from your gm stage 2 kit. If you would like at that point, I would say you would be safe to drop to a 2.9inch pulley. HOWEVER watch your IDC "Injector duty cycle" to see if you are maxing out your injectors.

If your injectors are going "static" or running over 100% this is NOT good. Most people feel and agree that 80% and under is where they like there injectors to be at WOT *wide open throttle*.

So what you might have to do, is simply upgrade to 60lbers and then go with whatever pulley that you wish. If you go this route, I personally wouldn't go lower then a 2.7 but some say 2.6s are fine and some push the limits and say 2.5s are fine. I however disagree and say that 2.7s are the "safe" zone.

It really all depends if you want your car to last, or if you want it to break. There will be a lot of people telling you "oh well i run a 2.8 on the stage 2 tune for 12,000 miles and im fine". I would like these people to actually use hptuners and check there injectors and see what they are at when there at 7k rpms. Then they will realize there mistakes.

I hate it when people make assumptions without any knowledge, and speak without knowing what there talking about. It really frustrates me.

The best way for you to gain "power" is to get cooling mods. The best way to gain better 1/4mile times would be "cooling mods, and traction mods". I personally recommend the Ingalls Stiffy TD for a traction mod.

It would be a good idea to put the list of your mods in your sig op.

This is my 2 cents, and I hope it helps.

 

Im running a 2.79" pulley with the gm stage 2 on my car,but i wouldnt recommend it if you beat the **** out of your car everyday.I dont race my car,so im not worried about it.I dont even remember the last time i redlined it.Ive had it on my car for like 25k miles with no problems to date.It put down 246 hp on a dynapack with only a muffler and drop in filter.Stock exhaust piping,dp etc.If i was going for max power,i def wouldnt do it with the 42lb injectors.

 

ptrblkz24, has a good point, i am on gm stage 2 tune with 42s and a 2.79, i dont beat the **** out of my car everyday, and it runs great, now i am saving for 60's and a tune but for the time being it runs great, and all i have is a front mount.

 

Thanks for your input man. It's the most solid advice I've had yet. I'm still learning about aftermarket mods. What are the "cooling mods" you speak of? Where can I get them? How difficult are they to install? I have experience with N/A engines, but not FI. Hope it's something that I can do. Anyway, as far as the other mods I'm running, I have the Ingalls TD, AEM cai, gmpp perf. exhaust, hurst short throw and gmpp stage 2. I'm looking for better 1/4 mile times. I have brand new Pirellis on so the tire issue is covered. I was thinking about exhaust header, but have been hesitant, b/c the gmpp perf. exhaust is a little too loud for my liking and I thought the header would just make things worse. Any more input you can provide would be greatly appreciated.

 

The 2.79 is a little too small for the Stage 2 tune.... you can run a 2.8 pulley on the 42's with meth and a damn good tune! Without that you run the risk of starving your motor, and pushing your injectors too far!

A safer point would be a 2.85 (with tune), or a 2.9 seems to run nicely on the stage 2 tune!

Cooling mods are Dual Pass, Methanol Injections, and Front mount H/E....

Get the most for your money the meth and H/E you can get both for 4-500.00 and give you substantial drops in temps!

 

So it's "safe" to run a 2.9 with 42lbs ers and the GM tune?

 

no it is not "safe" to run a 2.9 and 42lbers with the gm stage 2 tune. Your injectors will be going over 100% and that is NOT what you want.

However, will it kill your car and blow your motor and take your first born child if you do it? No. It can be done, but it should not be considered safe.