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02-20-2012, 06:02 PM | #1 |
Former Vendor
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I want hear the stories, the good, the bad, and the ugly.
Trying to make a decision on what to use on a car running 35+ PSI / 700ish WHP I have the 625+ 11mm in stock, the P&L and AMR are on backorder for a month. Cost is a non-issue. Anyone put any real boost through the 625+ yet? Anyone have any problems using the bigger stuff? Keeping the extra material in the block with the 11mm sounds nice as long as they can take the pressure. If I have to, I will wait for the bigger stuff. Heres some data I found, I am not an engineer. ARP CA625+ Material - ARP Custom Age 625+ Yield Strength: 235-255,000 PSI 11mm body diameter Tensile Strength: 260,000 PSI Torque Spec - 100ft lbs P&L Material - ARP2000 215,000-220,000 clamp load rating 13 mm body diameter 110 ft/lb torque spec Larger 24.5 mm/o.d. washer for increased clamping area AMR Material - 8740 chromoly 220,000 psi clamp load rating 9/16 diameter (14.2mm) 120ft/lb torque spec
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Last edited by No Limit Motorsport; 02-20-2012 at 06:13 PM. |
02-20-2012, 06:09 PM | #2 | |
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02-20-2012, 06:14 PM | #3 | |
Former Vendor
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---------- I just heard that the boys at Georgie Performance have been using stock diamter (L19) studs with good success. That tells me the 625+ would only be better. |
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02-20-2012, 06:59 PM | #4 |
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I have the custom age 625+ . I run the calculations and even with the larger cross sectional area and 10ft/lbs more at final torque the P&L 13mm have less clamping force than the 625+.
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02-20-2012, 07:00 PM | #5 |
Former Vendor
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How much horsepower are you running and how many pounds of boost? I need results not math lol
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02-20-2012, 08:40 PM | #6 |
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02-20-2012, 09:27 PM | #7 |
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Real world experience > math/theories
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02-20-2012, 09:48 PM | #8 |
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02-20-2012, 10:09 PM | #9 | |
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02-20-2012, 11:19 PM | #10 | |
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I had planned on guinea pigging the 625 11mm in my own car this year. 14mm have never given an issue but they're pricey. They're the only oversized stud that Darton East will install. |
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02-20-2012, 11:46 PM | #11 |
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Anyone know what studs the other fast cars are running? Obviously p&l are running their own
Easy street? Rigoli? Roger Clark? Precision tuning? I'm sure I am forgetting a bunch. Evo guys making 700ish tend to go for the L19 studs stock diameter with no issue. We have built a couple evos that make just over 800 with L19. Different application though. |
02-21-2012, 08:10 AM | #12 |
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I think these guys are doing Orings in racing.(the Evo guys surely are)
What are your guys retorquing strategies after initial install? Last edited by CatfaceType-R; 02-21-2012 at 08:15 AM. |
02-21-2012, 08:19 AM | #13 | |
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02-21-2012, 10:51 AM | #14 | |
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This particular Subaru motor is getting O-ringed |
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02-21-2012, 10:52 AM | #15 |
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02-21-2012, 11:08 AM | #16 |
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the Gobstopper don't have a headgasket, they use o-rings and something like o-rings to separate the oil and water from the block going to the heads. It works for closed deck Subaru engines only, I think version 3 and 4 STI engines. lots of machining but they have proven their technology
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02-21-2012, 11:30 AM | #17 | |
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I made some phone calls. I am going to give the CA625+ a go. Going to O-ring the block and run Cosworth headgaskets. If it lifts, I can always do bigger studs. I have faith it won't at the power levels this thing will see. Its also going to save about $400 in work that the machine shop wanted to do the job. Just waiting on my billet JE pistons to get here so I can sleeve this thing and get the ball rolling... Last edited by No Limit Motorsport; 02-21-2012 at 11:41 AM. |
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02-21-2012, 11:38 AM | #18 |
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02-21-2012, 12:20 PM | #19 | |
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Any particular reason why use Cosworth head gasket instead of oem? I'm thinking about that for a long time now, RCM 14mm headstuds, sleeved block with o-ring, I just don't know if the oem head gasket can be "o-ringed"... Btw what sleeves will you use? Is it Darton or LA Sleeves? Thanks |
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02-21-2012, 12:56 PM | #20 | |
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No doubt the OEM headgaskets are good. We have never had a problem with the Cosworth gaskets either, only great experiences. Perhaps its a placebo effect, the feeling that the more you spend the better you get. Here is a test showing the clamping area of the different gaskets. http://www.motoiq.com/magazine_artic...ed-blocks.aspx |
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02-21-2012, 02:48 PM | #21 |
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what's the biggest stud that will fit through the stock dowels?
also, wrc cars use larger studs on the center two holes. It's something I've thought about doing. Although we were up to 38psi on cosworth 11mm L19 studs. I think keeping the headgasket together is more an issue of temperature management than it is headstud size. Last edited by jamal; 02-21-2012 at 09:13 PM. |
02-21-2012, 07:51 PM | #22 |
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I am running the A1 Technologies Bolts. 620 whp at 28 psi on a GT4094R with E85 and a mustang dyno. I plan on pushing the boost to around 35 psi in two weeks.
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02-21-2012, 09:19 PM | #23 |
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Sounds promising. Keep us updated. I would expect the performance to be very similar to the ARP 625+. Are you running the chromoly or H11 version?
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02-21-2012, 10:16 PM | #24 | |
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02-21-2012, 11:18 PM | #25 |
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That sounds great. Please let me know if it is available in the market already
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