Hey guys, my cavy should be getting back on the road here any day as im just waiting for an idler arm for my blower kit

Anyways, I am running the gm tune for now and im wondering... will the blower cams from comp cams make a decent difference on that tune,
and do you think it is necessary to upgrade the valvetrain with those cams?

The other option (besides doing both but thats a ways down the road), is to pick up a zzp pulley kit. Not sure what size to pick up (stock internals
til next year).

What would you guys do aside from telling me to ditch the gm tune and get a real tune lol


had a blown ecotec swapped 2000 cavy, now just an 02 Grand Am, and a 74 BMW 2002...

Well I would say you need a real tune either way lol. But the cams will make more power by making the engine more blower friendly. You should upgrade springs for this. With the smaller pulley you will be getting more boost. Niether of these will work to their full benefit with the gm tune.

Blower cams wont do you any good on the GM crapflash and you NEED to upgrade your valvesprings for them. The computer cant see that you changed something in the engine, so i just keeps on running like it did before. I only plan on driving my car to get it re-tuned with the GM Crapflash and blower cams.


The GM crapflash runs pig rich and people(including myself) have had good results with running a 3.1" on it. Any smaller and you start running the risk of leaning out in the higher rpms.

What tinkles said is right. Im running the 3.0 pulley and the car will blow a little black smoke if I rev it sitting still from being so rich, but I also had a lean code stored . I'll be switching to a 3.1 pulley soon.

Alright thanks guys, about how much of a difference are people seeing with the 3.0 pulley?


had a blown ecotec swapped 2000 cavy, now just an 02 Grand Am, and a 74 BMW 2002...

if you get the cams i would drop a pulley size either way if you want more power, you will have less boost if you keep the stock compaired to a stock one without the blower cams, i have a 3" and im pushing about 13psi and i did the blower cams so ill be dropping to the 2.8" cause ill prob loose about 3 psi from the cams, so dropping to a 2.8 will make up for the 3-4 psi loss...


13.22 @ 105.2

Ty Petersen wrote:Alright thanks guys, about how much of a difference are people seeing with the 3.0 pulley?

Im at 10psi(3.1") and ~220whp with the mods in my profile. My boost pressures have always seemed to be a bit lower than everyone one elses, but psi doesnt mean power so im not concerned about that.

I already have the MPS on my M62 so since i will be getting retuned for the cams i am dropping down to a 2.9" just to compliment the new mods.

you sure all your lines are tight? im at like 13psi with a 3.0 and i was at about 10psi with stock


13.22 @ 105.2

I dont have any leaks, as i said before my pressures have always been lower than other.

Tinkles isnt your blower ported? if it is that will make your PSI lower.

EvoFire wrote:Tinkles isnt your blower ported? if it is that will make your PSI lower.

Not to my knowledge. When i bought it i was told that the only thing done to it was the MPS and i didnt see any tell tail signs that it was ported. It did come off a 284whp SS/SC though.

I'm only seeing 11 with the 3.0 pulley . There's lots of determining factors as to what psi you see with a specific size pulley . Mods ,altitude ,temp. All sorts of stuff

yeah i know that, when i was at a race even with my 3" my gauge was maxed out and it goes to 15... so it was probably more, but it was really cold and windy and the wind was blower against us....all i have is intake exh and i hit 13... huh, ah well, what did you guys get with the stock pulley?


13.22 @ 105.2

Jean Fortier wrote:if you get the cams i would drop a pulley size either way if you want more power, you will have less boost if you keep the stock compaired to a stock one without the blower cams, i have a 3" and im pushing about 13psi and i did the blower cams so ill be dropping to the 2.8" cause ill prob loose about 3 psi from the cams, so dropping to a 2.8 will make up for the 3-4 psi loss...

Loosing psi as a result of installing cams is NOT a bad thing. It's a good thing. Your making more power with less restriction and heat.

Don't drop a pulley size just to "maintain" a certain pressure; it is not a good reason to do so. Keeping the charge consistently cool and running reasonable advance w/o knock and having to run 10:1 afrs will yield more reliable power than spinning the blower faster.

It's your engine, i'm just saying - the blower moves a FIXED amount of air per revolution and making your motor eat that air more easily is key.

i wasnt saying its a bad thing lol, and i dont mean drop to a 2.6, im dropping to a 2.8 to get a lil more power after installing my cams.


13.22 @ 105.2

Dosnt having your system intercooled drop your boost pressure too? I Have always been wondering why my system is running low boost pressure compared to others. I have the stock pulley on it and only seeing 7-8 psi, seems more like 7 at most times. I always thought it was because my system is intercooled, but i dont see how its could drop 2-3 psi because its liquid cooled and not air cooled...... Also for the bottom vacuum line on the bypass valve, do you guys have that hooked up to anything or just have it open to atmoshere? I dont even have a vacum hose on the bottom nipple of my bypass valve, do you think thats making a difference in my set up? I have also been thinking about getting a 3.1" pulley because of how rich these things run on the crapflash. Something to raise my boost pressure to comp for the excess fuel would be nice probolly make more power too.



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