Hi guys,

I have same question for 2 setups.

I my self have stock jdm 8mr 10.5 turbo and my brother has fp white. Both engines are stock.
Question is do we need to have arp studs in order to run 25psi till redline? atm we are both spiking 26 and dropping do about 21 but would like to hold the boost a bit higher at the top.

Also we are running on 98ron(similliar to us 93)

any input would be appreciated.

cheers,

Marek

 

theres a couple of threads on this subject with very good info brotha. i installed mine before i got retuned and turn the boost up to 32psi. it wouldnt hurt to have a peace of mind

 

i tried searching but didn't find thread so maybe some links if known?

^32psi is that on e85? what turbo?

 

NOT needed.

 

^ have you tried running that boost on stock studs before?
do you know when will the stock studs start to be a problem?

 

fp green and e85 at 32psi. to clearify i was running 28psi when i was on 100oct with the stock bolts.... use some of these as reference
https://www.evolutionm.net/forums/ev...s+boost+rpm%3F

https://www.evolutionm.net/forums/ev...d+headstuds%3F

 

I ran 30 psi daily for a year on the stock studs with a red and e85.

 

i just want to confirm that all those boost levels you are talking about are at redline?

 

I think you should be ok as long as you dont do any hard pulls in 5th gear in low rpm. That is what i was told long time ago. Gl bro

 

Btw i was at 28 psi at the time

 

I was running out of fuel so i had to drop it to 28psi by redline 8000rpm to make AFR's safe.

 

Yes. I have run well over 30psi on the stock head studs.

You are trying to find a direct relation between manifold pressure (boost) and the limit of the head studs, which is limited to cylinder pressure. A spike in cylinder pressure is what will cause the studs to stretch and lift the head.

 

^exactly... thats why a low rpm 5th gear pull can blow it easy...

i ran 25psi tapering to 21psi(91oct) on my stock studs no prob... got arp studs because i went e85 running 30psi tapering to 22-23psi(e85) and didnt want to risk anything.

in the end with your setup you dont NEED them. If you are worried about it, get them...it wont hurt anything.