Can you 8000 rpm guys post vids of your cars acceleration?

 

 

He wants to see a video of a cobalt hitting 8000 rpm..

I wouldn't mind seeing it either.

 

find a non race cobalt that isnt already on youtube in here...our engine can withstand 8k revs we are not hondas

 

You need better information.

 

bone stock internally it may be unintelligent. there are only a couple things that need to be done in order to have it though

 

Not stock, but a killer valve train and a reason to go that high and it could work. It would way overspin the blower though on really small pulleys.

 

Someone go buy neutral balance shafts and upgrade your valvetrain. lol

 

i know that, notice i said race engine, anyone rev'n to 8k ona lsj is not a streetcar, let alone on a m62

 

I will get it done give me half a month. I am buying jbp's valve train group buy cuz I plan on going 8000 rpm. GM did it in there LSJ build book with a 2.8 pulley as well.

 

but how efficient do you think the blower will be at that kind of speed? and what is the purpose of wanting to rev that high? rev'n higher does not mean you get more pwr...you need a lot of mods to make a 8k shift point beneficial, i dont even think the 40+hp coby whats his name, paul, shifts that high

 

8192 red line, take it there every day i drive it.

shes most definitely a street car.

 

I am going to be setup to run up to 8k as well. I won't be back until April but if no one does it by then, I'll make a movie myself.

 

Sweet man what you do to get there?

and I ment half a year not month. I am buying the valve train parts in half a month so you should have a vid befor me.

 

The blower will be less efficient but that all depends on the pulley. An 8k redline would be beneficial in first gear (Longer to gain traction) and third in the quarter (no 4th gear shift on the faster cars that have this issue).

Finally, imagine our long 2nd gear with an 8k redline! That would be fun!

Why are you so negative about a higher redline?

 

I have the neutral balance shafts, and an ottp head with upgraded valvetrain. I also replaced pistons in the block to mate with the tvs I have.

 

not the higher redline that bother im all for using it to your advantage, but looking at the mods he has on his profile: which is close to none; a 8k redline even with the valvetrain will do almost no good on a stock set up like what he has, if he plans for it in the long run than yeah it might be worth it, but also remeber the point is to make power thru out the entire powerband, no point in shifting @8k when ur powerband climaxes at 6k or 6.5k or whatever the stock LSJ peaks @

 

xtc im selling some jbp first gen cams with springs if you are interested

it wouldnt peak at 6.5 with cams. thats kind of the point.

 

I still have way more studying about cam profiles to do before I get a grind of my own.

 

PM coming your way hat.

 

your pm box is full

 

I just made room sorry.

 

Here are some quick numbers:

If 16k rpm is the maximum safe speed for the M62, then these numbers should be a nice baseline for anyone considering going to 8k.

2.5 @ 6400 = 16,000 rpm = 20,000 rpm @ 8000
2.6 @ 6656 = 16,000 rpm = 19,231 rpm @ 8000
2.7 @ 6912 = 16,000 rpm = 18,519 rpm @ 8000
2.8 @ 7168 = 16,000 rpm = 17,857 rpm @ 8000
2.85 @ 7296 = 16,000 rpm = 17,544 rpm @ 8000
2.9 @ 7424 = 16,000 rpm = 17,241 rpm @ 8000
2.99 @ 7654 = 16,000 rpm = 16,722 rpm @ 8000
3.11 @ 7962 = 16,000 rpm = 16,077 rpm @ 8000

So it appears the stage 2 pulley (3.11) would be just passed 16k by the time you hit 8,000 rpm, and any pulley smaller than that would be over spinning the blower. That doesn't necessarily mean your m62 goes pop, it just means you're outside of its efficiency range and deceasing its lifespan.

As far as whether you'll still be making power that high, I wouldn't know that. I imagine at that point you'd need meth to control the heat.

(FYI the TVS has been tested at speeds up to 22,000 for over 100 continuous hours with zero failure per Harrop)

 

i can be done very cheaply. neutral shafts or shaft delete, higher strength springs, and either cams or cam gears to take advantage of the RPMs and your done.

 

Pyros, could you post the same numbers for the tvs? I am curious if we can spin the blower outside it's efficiency range.