Well has anyone else noticed that the 2.2 seems to pull up to the 6500 and want to keep going? Well with the possibilities of tuning coming how high can the stock internals go safely? Im pretty much done with my car as it is now but I may get some nitrous here soon and would much rather wait til i can get somewhat of a tune?

 

cant remember which thread it was, but someone said they raised the rev limiter to 7k i believe and it made power to 6900 and dynoed at like 160hp at 6900k

 

i thought our cam profiles have us set around 6200 for max power...

 

this is true, in order to make any more power you would need a different cam profile.

 

i believe the weak point of our engines is the connecting rods that i have heard give out between 250HP and 300HP but there are some aftermarket rods made by eagle that can withstand 600HP

 

Well, the pistons are actually the weak part of the engine. The rods only get 10% of the stress put on from the pistons. The pistons are weak because they have VERY little space between the piston rings and the top of the piston, making them bad for FI. You can go much more then 250hp on the connecting rods, its the pistons that are going to get you. But if your going to get nitrous, then you may want some forged pistons and rods, then you can throw a 100 shot on it if you wanted to.

Nitrous is kinda like a really hot, skanky chick. They are really hot to look at, but you never really wanna hit it.

 

but every once in a while you just cant resist

 

i hit it all the time

also unless I'm on nitrous, no I don't feel my car continuing to pull at 6500

it seems to fall on its face IMO shortly after 6Kish

 

X2 When I drive my dads 2.2L Ion, I shift at 6. From 6 to 6500 rpm it seems to take FOREVER, the motors just screaming at you by then.

 

Hot skanky nitrous girl ftw!

 

the connecting rods snapped at 281HP under nitrous...connecting rods will be the first to go if running high HP numbers...FI your safe to about 250HP, but for nitrous stay below a 75 unless you want to do a little internal work

 

even with a intake and full exhaust the 2.2 still seems to go flat at 6 or just before... other then that she's just revving up.

 

Couldn't say it better myself!!!

 

damn i wish i could change and tune. ******* no tuning avaible so i cant get Cams that will give good performance

 

To answer your question, the stock engine can safely spin at a bit over 7000 RPM. The limiting factors become the Balance shafts and the valve springs. With neutral shafts and better springs, you get up over 8000 RPM. The engine has been built in race applications to 10,000 RPM.

However, normally aspirated Ecotec power comes from torque, not high revving horsepower. Your torque peak is around 3-4 thousand RPM, so any higher is just a waste.

 

Wait so are you saying people should shift at peak torque???? Please explain?

 

no...shift at peak power...since our peak torque is at around 3.5kRPMs, along with our cam profiles falling off at 6200RPMs (causing torque to greatly drop at 6200RPMs), your power band will be at 4-6.2kRPMs

gotta reember...Power=torque*RPM/5252

but new cams with a power range of say 4k-8kRPMs would raise the max torque...i believe..?
it would still be beneficial with new cams is what im sayin

 

Weird, I replied to this yesterday but my post is gone now. Server issues....

Looks like HunterKiller above got it. I never said anything about how to shift. I was saying that torque is what accelerates the car. So since higher RPM will make more horsepower but not more torque, there isn't too much point in raising the stock RPM since you can achieve best acceleration within the RPM band already available.

But talking about shifting, you would want to shift at a point that drops the RPM to just above the torque peak to keep the engine at max available torque through the gears. I think some Porsches actually have the torque band marked on their tachs.
Well sure, with a cam change you could move the torque band. But now you are getting into some serious stuff. I don't know of any aftermarket cams that are geared toward high revving power. I'm not sure of what the GMPP racing cam set is designed to do. You would need probably need a custom grind.