I shift mine at 10,700rpms

 

Well Chris@ Mellon tuning is shifting @ 8500RPM on stock valvetrain with HKS 280's .
Watch his video(last part)
Im revving 8100 in my HKS 280s

 

damnnnn im bumping my limiter to 8grand too!!! good information to know...but ill keep it safe and never go pass 7500...

 

usually dont go past 7200, at the drag strip 8000 is the max i will go to.

 

7600RPM is the Factory Rev Limit. Don't you think Mitsu won't made a valve spring that will rev 1K pass the rev limit?

 

I've been spinning mine to 8500 since December 07 as needed to make it through the 1/8th mile in 3rd gear or 1/4 mile in 4th gear without hitting the limiter or having to shift to the next gear. I use it sparingly because I know it's risky.

 

yea i dont think ill be hitting 8500 right now but ill be close but still good input people. i hated shifting into 5th at the track, slowed me down too much

 

I think the specs on your cams have alot to do with how high you can safely rev the motor with stock valvetrain. Lower lift/less ramp profile has a ton of impact on rpms the stock springs can manage.

HkS cams have lower lift then Cossie's for example. Refer to your cam card for the info.

Just my.o2.

 

What about rod bearing failures any reports of that?

My valvetrain is upgraded but still on stock pistons and rods..rod bolts etc.

 

yes but on www.3si.org screwed that one up

 

How important is it to replace the rod bolts and how much of a PITA is it? I've done it on a DSM but have never had an EVO opened 4G63 opened up.