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02-02-2017, 11:26 PM | #1 |
Scooby Specialist
Member#: 243992
Join Date: Apr 2010
Chapter/Region:
MWSOC
Location: Morton Grove, Illinois
Vehicle:2006 WRX TR WRB |
Refresh H TUFF rods eith 625 hardware for 600-700whp?
So. I will keep it simple.
I have a 75 lb/min turbo and am going one of two ways with my motor build. Low cost and limiting power. Or high cost and shooting for whatever the turbo (and rods) will allow. I bought the Manley Htuffs with like 3k on them. They have the standard ARP2000 hardware. Would the 625 rod bolts help these rods up near 700whp? It's a small turbine/turbine housing/spool valve so it'll be decently torquey. Is it even worth refreshing the rod bolts in general? Then that being said. What's the best way to find the upgraded rod bolts? I assume just call Manley/ARP.
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02-02-2017, 11:58 PM | #2 |
Scooby Specialist
Member#: 25768
Join Date: Oct 2002
Chapter/Region:
RMIC
Location: CO springs
Vehicle:2003 XONA 9569S 40++ 2.3 slobaru |
The guys at Manley and outfront say the H tuff should handle 250 crank hp per cyl with the 2000s
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02-03-2017, 01:05 AM | #3 |
Scooby Guru
Member#: 71875
Join Date: Oct 2004
Location: Montana
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Well, my understanding is that the forces on the rod bolts mostly come from RPM and piston and rod weight, not so much the power. And then the rod itself is stressed more by peak cylinder pressure.
So if redline isn't going to be particularly high, I don't think the ca625 bolts are necessary. The real way to tell if you need new bolts or not is to measure them before and after. If they've stretched, they need to be replaced. |
02-03-2017, 02:32 PM | #4 |
Scooby Newbie
Member#: 143837
Join Date: Mar 2007
Location: Houston, Tx
Vehicle:2000 Impreza 2.5RS BRP |
When you are looking into 625's, case bolts, and 1/2" bolts pay attention to your mains. You are getting into some machine work and potentially very specific bearings.
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02-04-2017, 01:59 AM | #5 |
Scooby Specialist
Member#: 57064
Join Date: Mar 2004
Vehicle:2008 STi IAG built HTA86 E85 Kel272s Cos IM |
Should be fine
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02-04-2017, 05:59 PM | #6 | |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
Quote:
625s will be more tolerant of a miss-shift as well. |
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02-04-2017, 08:00 PM | #7 |
Scooby Specialist
Member#: 243992
Join Date: Apr 2010
Chapter/Region:
MWSOC
Location: Morton Grove, Illinois
Vehicle:2006 WRX TR WRB |
I will be running a beefier piston than necessary, turbo tuffs.
Stock redline as I'm on stock heads at this point in time. |
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