Witt, there is a lot more than HP to be considered for engine safety. in the GP market people blow up all the time with less than 250WHP on stock motors. At the same time we do turbo builds past 500WHP all day long on stock bottom ends and have gone over 700WHP on stock bottoms. Detonation is what kills the engines in many cases and a stock Cobalt with a 2.5" pulley is going to run into EGT and detonation issues unless you're running a lot of octane.

Our twin charged car actuallly did 465WHP on a stock bottom and was set to do 500 til the clutch let go. This was never to advertise the kit as being sold like that. If you recall the threads, during the build people we're saying the stock bottom would let go at 350, then before 400, etc. Everyone chiming in about the motor not being able to handle it. Our goal of running the twin charged to nearly 500WHP was to show that our kit is safe. Obviously if we can make that kind of HP, it's reasonable to assume that 350 is going to be pretty safe for a long time.

The other goal was to demonstrate that we are experience in advanced modding and are capable of doing things that other companies and people are not. It took us two months to out dyno anything the members here or vendors had ever done. When we did, we bruised some egos and got called liars so we repeated the performance on a customer car. We got called out again so we'll have cars at the track in a few months. When we hit the track it will be the same thing. We will run times with our mods that blow people's minds and we'll make it look easy. But once again, when we post a time it won't be because we're claiming that anyone with XXX mods from ZZP will run the same time. It will be to show what the potential of our mods is and what we're capable of.

 

lets see here
3.0 pulley at 22 degree's of timing
versus
2.7 pulley at 22 degree's of timing

which ones faster through the traps?

funny someone speaks of egt's. a stock ss will bury the needle. a stage 2 car does the same thing.

hell a stage 2 2007 ss runs 22.5 degree's of timing. or tries too.

 

agreed. these cars run hot as hell. its just rediculous.

 

What kinda EGTs do you get with a 2.7 with cooling mods ( meth, HE , Option B Dual Bypass) Vs a 2.6 same mods as above....?

 

depends on timing and afr.

i hit the traps at 1350 degree's. tvs

i hit 1500 degree's on a 2.7 runnin a gto to 150 mph with the m62.

 

How far is your probe from the head?

 

i believe his is 1.5in from the head in the #4 cylinder primary.

 

1.5 inches away from the exhaust port on number 4

 

pretty decent memory huh

 

might say that

 

Highway Cruising: 1300-1350*

WOT: 1475-1500*

Idle: 800-900*

2.7/meth/and lots of timing

 

aren't you supposed to be working?

 

I was gonna drop to a 2.6 or 2.7 but hell after readin this i might just keep my 2.8 and be happy lol

 

Those pulleys are good but you have too have the cooling mods too support.

 

Eh, I ran nothing but injectors, 2.5" pulley, and tune. No cooling mods, complete stock exhaust. I did finally get meth at the end, but only after the motor build because I raised compression.

 

my buddy just blew his motor last week. he was running an Intense stage v kit... basically its all in the tune.

 

I agree if you have a good tune with proper timing and air/fuel with the 2.6 you will have no problems.....

 

Hm but the 2.8 holds power all the way threw and doesnt over spin the M62....thats reallly my only worry with running smaller, Would a 2.6 and H/E be ok as long as i dont beat on alot

 

hmm apparently he wasn't running any cooling either... no one said my friend was smart.

 

You will be fine with a 2.6 and h/e. You'll pull timing up top due to your iat's being high. I ran a 2.6 on my car for a while with 0 cooling mods. It was fine. Just heatsoaked like crazy and my iat's were a little high

 

It was more so the Intense tune than anything. They are known to be ****, and caused a lot of blown motors.

 

So if you run a large HE with a good meth mix you should be fine?? What were your IAT2's with 0 cooling mods...my 2.7 with HE , Meth ---(water injection) was running 114F degrees at WOT tops...

 

My iat's with 0 cooling mods were like. 180+ after several WOT pulls I'm sure. It was ridiculous.It pulled a lot of timing.

With meth only they stay around 150 after several WOT pulls with only a 3gph nozzle.

 

Hopefully this doesn't start any drama. The intent of my posting (and all of my posts) where I'm giving information is to help the community.

Back to what I was saying. The majority of guys here are running too small a pulley. Not just for safety but for performance as well. Yes, a larger pulley in many case will yeild higher HP and better ETs, assuming you setup the car properly for it. Further supporting my case against water injection and super small pulleys is this thread:

https://www.cobaltss.net/forums/drag-racing-52/new-stock-blower-record-140630/

The fastest guy (stock blower) on this entire forum is running a 2.85" pulley. Additionally, he is not running windshield washer fluid. This is out of thousands of guys buying mods and trying to go fast. Clearly Hatrickstu is doing things right. You cannot run times like his without knowing something and you cannot be the fastest without doing things better than other people are. He would not run 11's with meth and a 2.6" pulley, he would slow down. This guy is even runnig faster than most TVS guys because the TVS is not going to give much gains without increased octane or intercooling. You cannot take advantage of higher boost levels the TVS can make without cooling the charge or raising octane. But now I've delved into 2 different topics.

Oh, also to note. Our 2004 Ion ran 13.5's at close to 107mph with a 3.1" pulley and stock PCM.

 

He has very good times.. And ALOT of it has to do with traction mods...

I think he would do better times if he put the smaller pulley on...

I also cant see why you just cant let things go already...