i've been running 10-16 psi for two years now w,upgraded ct-26 60-1.
arp studs @ 85flbs. ididn't spray the HG with anything either.
arp studs @ 85flbs. ididn't spray the HG with anything either.
how many are running stock HG's?
- Thread starter JDM 1JZ
- Start date
- Status
damn thats pretty impressive i think? any other mods? tuning? im thinking this is definately the correct route for me to go at this time because i am not comfortable throwing a MHG on like some people do it with out decking the block, when i do things i like them to be done right and the right way is def composite hg, arp studs, copper gasket, and x tq i havnt decided what yet
JDM 1JZ said:
It's a personal choice...like I said, it won't hurt on a composite HG. The big thing here is to use ARP hardware (torqued to ARP spec). You want the head/block deck smooth as possible, but you don't have to worry about a low RA like you do on a MHG.
Oh...HP out of this motor is directly related to boost. Above 14 psi you run more of a risk of detonation (depending on fuel mods)...a composite HG will not take ANY detonation. With a MHG, you might get away with it.
but either way detonation is death to the hg on our motors correct? im sure the mhg can take a tad but no more than usuall id exspect
Death to the HG or the pistons 
FYI...IJ's motor took a detonation hit (went lean on him) at 30 psi...his HKS Stopper MHG survived. A MHG allows you to push the limits more than a composite HG allows.
I'm not saying running over 14 psi of boost will cause detonation...there are many factors that cause it. Several guys have (and still are) running well over that on a composite HG...what I'm saying is the composite HG leaves you very little room for error. Attention to detail in the build and the tune spells success or failure in this game 14 psi of boost leaves you a margin for error and will still give you pretty darn good HP numbers.
FYI...IJ's motor took a detonation hit (went lean on him) at 30 psi...his HKS Stopper MHG survived. A MHG allows you to push the limits more than a composite HG allows.
I'm not saying running over 14 psi of boost will cause detonation...there are many factors that cause it. Several guys have (and still are) running well over that on a composite HG...what I'm saying is the composite HG leaves you very little room for error. Attention to detail in the build and the tune spells success or failure in this game
14 psi of boost leaves you a margin for error and will still give you pretty darn good HP numbers.
so really it can be looked at 2 ways. since the mhg is near bulletproof, it can risk the motor and with the composite the composite will blow before the motor will? or does that not make sense, sorry for all the ?'s by the way. since im choosing to go this direction because it is more the right thing to do i would just like to know the facts
In general, a composite HG will blow (under detonation) before it damages the pistons. Having said that, I've seen piston lands come apart and the composite HG did not blow Running a MHG does not put the motor at risk...pushing the motor to high HP numbers does though. The more boost you run, the better the motor (attention to detail) has to be built.
Going with a composite HG is easier to do...the machine work does not have to be as smooth as requires for a MHG. Just realize a composite HG has it's limits...stay under those limits and you'll be fine.
Running a MHG does not put the motor at risk...pushing the motor to high HP numbers does though. The more boost you run, the better the motor (attention to detail) has to be built.Going with a composite HG is easier to do...the machine work does not have to be as smooth as requires for a MHG. Just realize a composite HG has it's limits...stay under those limits and you'll be fine.
i relize, down the road a little when i have more time and money i am going to do her with machine work and good hg, but for not this has to do, no sense in throwing the mhg on and hoping it will seal because thats just ghetto to me, atleast i'll be doing the composite install correctly and i can atleast live with myself
im stock at about 15lbs.... lexus afm and 550s, aem eugo
i know im pushing it too much, but what are ya gonna do
i know im pushing it too much, but what are ya gonna do
JDM 1JZ said:
That's the way to think...do it right, do it once
Just don't push the motor too hard with a composite HG and use ARP hardware (did I say torque to ARP spec...lol). Make sure you measure the head/block decks for flatness per the TRSM...In fact read the TRSM on this subject several times :naughty:
Dean Marcum did it. I don't know if anybody else has. He seperated the ring lands at about 500rwhp, but didn't loose the OEM style headgasket. Go figure.jdub said:
JDM 1JZ said:
Right here...what you are looking for is in the EM section.
http://www.cygnusx1.net/supra/techtips.aspx
- Status