valvesprings/retainers would be an insurance just like ARP head studs "higher boost is must needed" , i would

 

This thread is a total waste. I will agree with one thing though, Warrtalon is a total dick, constantly posting nothing but rude irrelavant responses to questions. I can't tell you how many times I have seen his posts, always off topic and never helpful.

Proving once and for all you are what you eat.
Warrtalon=Dick

As far as your question, factory redline typical is set to prevent idiots from over revving the motor. Usual there is a little room for error in the factory redline. Valvetrain components and "bottom end" components (i.e.- rod bolts) are critical to letting your engine rev higher. These are the moving parts that absorb the stresses involved with revving your engine higher.

Tuning will need to be done though to utilize this increase in RPM, seeing as how the boost drops off near factory redline. When you begin to increase the boost thats when those head studs will come into play. I would have them done though while you have the cams out.

My .02, don't own an EVO but understand the dynamics of internal combustion motors.

 

Sorry, this is an off topic reply, but it seems Warrtalon has a large fan-base...haven't dealt with him so I can't judge him, but DAMN!!!!!

As for rev limit, it really has less to do with the cams themselves and more to do with how much the springs/retainers AS WELL as the bottom end (pistons/crank/rods) can take. I just bought the Works 269 cams and springs/retainers and I asked them about the rev limit. They said with just cams, safely to 7800 (stock is 7600 I think) and with springes/retainers...8000. They said they wouldn't push it past that without some bottom end work...

 

i have 280"s in my car and i shift at 7500 but im sure 8k is safe on stock valvetrain

 

I thought that too but another Evo owner told me that I was talking BS, saying that the rods would need replacing before the bolts ever did.

 

the rod bolts are subject to 4 tons of acceleration force, they're much more prone to stretching and subsequent breakage than the actual rod.

 

Warralton got beat up for his lunch money his whole life. Thats why he is so ignorant.

 

ARP headstuds are not "must have" either for high boost. I run 23 to 25psi on the street and as high as 32psi at the track on racegas most of this year. No hg issues at all.

They are a bit more insurance against bad tuning blowing the headgasket. Detonation is the first thing to blow a hg. Detonation at 300hp could kill the hg seal before 500hp would if tuned clean, just as example.

 

yeah I was surprised too, maybe we should start a thread with a poll and make it a sticky in the general or off topic forum..



I was looking at Buschur's valvespring/retainer set which retails for like $375

 

where's blairstown, NJ?

 

A lot of these things depend on the degree/frequency of use anyway. I.e. endurance racing or sporadic batches of fast driving and predominently street use.

I don't care much, I don't own an Evo and only have to worry about internals if I want to go over 8000rpm.

 

Anymore info on using the gear settings of 2/0 to drop the powerband down a bit?

 

The set of valvesprings and retainers are $275, not $375 That's actually a very good price, i'll actually maybe consider getting them now.

https://secure.buschurracing.com/cat...2860a6aec1b43d

 

Are you still on the stock turbo? If so then 8k seems like it would be a pretty good limit for your setup. If it were me I would at least get springs and retainers if you want to go over 8k. You probly can run the moter to 8.2 to 8.4k for a while but each time you do you are streching the rod bolt, the bolt could continue to hold but now you have opened up the big end rod clearance slightly therby eventually leading to a spun rod bearing it continued to run with excessive clearance. I would also start to question the long term durabilty of the piston at 8.5k rpm.

 

I'd probally buy the kit from buschur just as insurance, i've never seen a price for them that low.