a 2.6 is over spinning/working the supercharger..but give or take it is what it is.. as a member on here posted... he was replacing his blower every 30,000 miles with a 2.5 or 2.6 cuz ur over spinning the blower.

 

your wrong.. obviously you have to taper down the rev limiter, your not over spinning it, but rather getting it to where you want it to be FASTER.

 

The M62 reaches Peak efficiency at 14,000 rpms. Max efficiency is 16,000. Too far past that and it is getting over spun and is producing more heat and causing more parasitic hp loss then extra power.

The size of the sc pulley determine where in the RPM range the blower hits those efficiency points.



Most people say go with a 2.8" because it will hit 16,000 blower RPMs just after 7k. A 2.6" pulley hits 16,000 blower RPMs at 6500 engine rpms. An M62 will still make HP past 16,000 but not very efficiently.

 

Yeah, well i get a screeching belt sound sometimes around 6500-7000rpm...ONLY when its humid/been raining out...At least thats all i noticed. But yeah, its a real GM stage 2 belt from CED.

 

i had a 2.6 on my m62 too that is what i was refering too lol but good eye!

 

you have to make sure your tune is on point, other wise the motor will say **** you and blow #1 and #4 ringlands.... ask me how I know.

 

Yeah, well i def dont have a tuner that i personally can trust...just one that has been recommended to me.

haha thanks. Figured that was the case, but just wanted to check!

 

okay... anything below 2.7 ur over spinning the blower dude. jsut be realistic.

 

That plain statement is not necessarily true.

You could run a 2.6" pulley and never "over spin" the blower if you shift at 6500. Just because your rev limiter is set at 7,000rpms does not mean you have to wait that long to ****.

You guys really need to get your sh*t straight. Stop regurgitating what you have heard other people regurgitate and take the time to understand what you are talking about it.

Technically, you can "over spin" the M62 on a 2.9" if you decided to rev out to 7300rpms.

We have already established that the LSJ makes Peak HP around 6500rpms. The only reason to rev past that would be to start at a higher RPM in the next gear. Anything after 6500rpms and the power is falling off.

Do you guys not understand what I am talking about?

 

So ebristol going to the track would you recommend shifting at 6500 rpm?

 

Listen to this guy.

 

Proof that pulleys dont chunk engines. It's all about the t00n

And heres some advice. When you have a knowledgable veteran posting dyno sheets and trying to drop some knowledge, listen

 

I ran a 2.6 and 60s and a h.e for one year as well no issues........ I dont recommend that but it was a testing stage lol

 

For the record, my ZZP 2.6 pulley on the M62 didn't need grinding when I had that pulley

 

I used to be one of those "people". My friend still regurgitates it to me when i tell him im planning on pullying down some more. After doing more research, i have to agree with you (obviously). I think most people were just going under the idea you'd still be shifting at 7000-7400rpm, in which case...yeah...overspinning it.

However, by shifting where the stock limiter is, you're fine. Obviously need the supporting mods (meth seems to be a consistent item, or E85 for you lucky *****!).

 

I hear that the ZZP 2.6" pulley clears the snout.

I'm glad you have confirmed it.

 

Over spinning at 7k+. How long are you holding the motor at 7k+ and how often do you go 7k+??? Hmm?? I was about to make a post stating the same thing as Ebristol. He knows this from learning from us veterans that learned from eachother. He is a valuable member and YOU need to listen to what he has posted as I back it up from personal knowledge and experience. Too many of the members that have joined in the last 4 years (since the LNF basically) are just spitting up misinformation. Do some thinking. And while your at it, answer my first question about how long/often you at at 7k+RPM..... It DOESN'T MATTER. The TUNE does....

This is why I don't frequent this forum as much as I used to. No one listens to someone who actually knows wtf they are saying......



No problem man. Honestly, if you have any questions, look me up on FB and get my cell off that

WickedSS2005


Amen to that

Personally, I did my best runs shifting just shy of 7k, drops me back to a better RPM at the next gear

 

I appreciate it man. Will do.

 

(Slight jack warning) So the stock crank pulley is 6.3"? I picked up a CA overdrive used a few months ago, would a 2.7 on one of those act as a 2.6?

 

Hypothetically, yes

 

Probably because the number of Cobalts in German are probably easily counted on one hand.

 

So whats better...running a 2.6 @ 6500 or a 2.8 @ 7000 powerwise? Is it just a difference in low end torque?

 

sub. cause i have a 2.6 sitting in my room

 

Oy.....:Facepalm:

There needs to be stickies on some of the information posted here.

I was always under the impression that our crank pulley is 6.5".

 

Bolt it up. You will love it! If you have meth or running E that is. When I bolted up my long tube and 2.5" catback I noticed a drop in low end torque. Well the 2.6" brought it right back up and more. I love 2nd gear. It pulls hard