When I first got my eclipse I had crazy plans for it. I once read we we're limited to boost pressures in the upper 20's due to our heads lifting even with the best head studs available. Has anyone come up with a better head stud since then or are we just screwed due to physics? Not that I am near 30 PSI or boosted yet for that matter. Just Curious.
Originally posted by thedawg
I ran 15-18psi on my stock a604 for about 30k miles then it broke. It makes cool whining noises now.
#106171, "RE: Boost still limited by head studs?" In response to Reply # 1
How much have the 1/2 inch studs been proven to handle? or what has been the weakest link after that? I need to pick up Maximum Boost. Are there any other good reads available that I should grab while im at the book store?
Originally posted by thedawg
I ran 15-18psi on my stock a604 for about 30k miles then it broke. It makes cool whining noises now.
#106172, "RE: Boost still limited by head studs?" In response to Reply # 2
you won't be able to reach the threshold of power that the 1/2" studs will be able to clamp. In conjunction w/ a cometic HG, and your seal is very hard to break. Even at over 30psi
Outside of Corona: "That sucks, peace out..." (jamie walks away)... "Sweeet, what we doin?" -Zac Tim's garage (prior to motor install): "Im gonna smoke real quick, that way if you fuck up I am already nicotined up" -Tim
Outside of Corona: "That sucks, peace out..." (jamie walks away)... "Sweeet, what we doin?" -Zac Tim's garage (prior to motor install): "Im gonna smoke real quick, that way if you fuck up I am already nicotined up" -Tim
#106188, "RE: Boost still limited by head studs?" In response to Reply # 7
Originally posted by misfitz tap messure shows mines 1/2 inch... im already running 21psi
Then yours aren't stock.
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#106199, "RE: Boost still limited by head studs?" In response to Reply # 9
they can be ordered a-la-carte from ARP
there are 10 studs total so pay attention. 4 short studs are 5.06" long 6 long studs are 6.76" long
for the short ones you can either go with: 1. ar5.000-1lb which is their 5" studs 2. ar5.250-1lb which is their 5 1/4" studs Tricky because you don't know if you can get away with #1 or #2. A machine shop can help you with this.
for the long ones you can go with: ar6.750-1sb which their 6 3/4" studs
the shortie studs are $6.13 a piece x4 = $24.52 the long studs are $8.67 a piece x6 = $52.02 you'll need 12 pt nuts for your studs which is part# 300-8334 -- $30.75 and you'll need washers part# 200-8534 -- $8.92
grand total _________ $116.21
That is directly from ARP but I can't remember if that includes shipping or moly lube
Outside of Corona: "That sucks, peace out..." (jamie walks away)... "Sweeet, what we doin?" -Zac Tim's garage (prior to motor install): "Im gonna smoke real quick, that way if you fuck up I am already nicotined up" -Tim
#106200, "RE: Boost still limited by head studs?" In response to Reply # 10
Originally posted by 420agreenvilleSC they can be ordered a-la-carte from ARP there are 10 studs total so pay attention. 4 short studs are 5.06" long 6 long studs are 6.76" long for the short ones you can either go with: 1. ar5.000-1lb which is their 5" studs 2. ar5.250-1lb which is their 5 1/4" studs Tricky because you don't know if you can get away with #1 or #2. A machine shop can help you with this. for the long ones you can go with: ar6.750-1sb which their 6 3/4" studs the shortie studs are $6.13 a piece x4 = $24.52 the long studs are $8.67 a piece x6 = $52.02 you'll need 12 pt nuts for your studs which is part# 300-8334 -- $30.75 and you'll need washers part# 200-8534 -- $8.92 grand total _________ $116.21 That is directly from ARP but I can't remember if that includes shipping or moly lube
#106201, "RE: Boost still limited by head studs?" In response to Reply # 10
Originally posted by 420agreenvilleSC they can be ordered a-la-carte from ARP there are 10 studs total so pay attention. 4 short studs are 5.06" long 6 long studs are 6.76" long for the short ones you can either go with: 1. ar5.000-1lb which is their 5" studs 2. ar5.250-1lb which is their 5 1/4" studs Tricky because you don't know if you can get away with #1 or #2. A machine shop can help you with this. for the long ones you can go with: ar6.750-1sb which their 6 3/4" studs the shortie studs are $6.13 a piece x4 = $24.52 the long studs are $8.67 a piece x6 = $52.02 you'll need 12 pt nuts for your studs which is part# 300-8334 -- $30.75 and you'll need washers part# 200-8534 -- $8.92 grand total _________ $116.21 That is directly from ARP but I can't remember if that includes shipping or moly lube
Yeah that defently needs pin'd or wiki or something...
#106202, "RE: Boost still limited by head studs?" In response to Reply # 9
Originally posted by misfitz
Originally posted by DarkOne
Originally posted by misfitz tap messure shows mines 1/2 inch... im already running 21psi
Then yours aren't stock.
Take that back, umm, i messured wrong they are stock 7/16... So you guys are saying with these i can can over 21 psi of boost? hmmm, how much are 1/2 studs and where do i get them for mine?
Im running 23-24psi on a 20g with 7/16" studs with no problems. Plan on boostin up to 26-27psi on the dyno once I add meth. Maybe they will hold. Untill you start getting close to the 400whp range I wouldn't worry about them at all
#106208, "RE: Boost still limited by head studs?" In response to Reply # 13
Originally posted by SilvrEclips
Originally posted by misfitz
Originally posted by DarkOne
Originally posted by misfitz tap messure shows mines 1/2 inch... im already running 21psi
Then yours aren't stock.
Take that back, umm, i messured wrong they are stock 7/16... So you guys are saying with these i can can over 21 psi of boost? hmmm, how much are 1/2 studs and where do i get them for mine?
Im running 23-24psi on a 20g with 7/16" studs with no problems. Plan on boostin up to 26-27psi on the dyno once I add meth. Maybe they will hold. Untill you start getting close to the 400whp range I wouldn't worry about them at all
The most its put down was 383 on 22psi..
So im pretty close to the 400 mark..
I guess ill talk to the machine shop on those 5.06 studs and see which would be best to get the 1/2 studs so theres no worries at all..
Outside of Corona: "That sucks, peace out..." (jamie walks away)... "Sweeet, what we doin?" -Zac Tim's garage (prior to motor install): "Im gonna smoke real quick, that way if you fuck up I am already nicotined up" -Tim
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