Er loopt nu een thread op vortex met heel wat uitspraken over te vermogen dat een std blok aankan, ik post hier wel wat daar staat, ik zelf vind dit heel handig.
#1 How much power can stock aaa vr6 rods hold with JE 8.5:1 pistons and stock crank?
#2 Has anyone seen problems with non metal head gaskets even with arp head studs retorqued to proper spec?
#3 Has anyone seen or had 02A axles snap? And if so what conditions did they break under?
#4 Has anyone had problems eating through thermo coatings on manifolds and exhaust housings? If so what did you do as an alternative?
#5 And last would be an open question for what problems people have had on HIGH power turbo VRs?
#1 Answer-ish: The real problem with the VR rods isn't hp it's torque. The main reason for upgrading to forged pistons is not only that they hold up better to SLIGHT detonation but they have stronger ring lands. The down fall to using stock connecting rods is they aren't recommended for high torque (even though they were designed to be diesel rods). There are a handfull of people with high 400 torque numbers and over 500 hp with stock rods. Piston speed is also a problem when turning higher RPM's.
#2 Answer-ish: What do you mean by non-metal? If you have built a VR6T with a head spacer you know you have to use an MLS head gasket (ie. MK4). If you are using low compression forged pistons I would recommend the MK4 MLS gasket.
#3 Answer-ish: I don't care what axles you use, they can break. We broke a set of DSS stg. 5 axles on a Neon non SRT4 with much less torque than you are trying to make. The real killer of axles is the sudden torque spike from wheel hop, bumps in the road and unexpected traction when spinning.
#4 Answer-ish: The best thermo coating I know of is ceramic. Most thermo coatings will hold up as long as go don't go super lean and have a heat spike. 1300-1500F is about max.
#5 Answer-ish: Lots........
Chris ran 531whp on his stock rods when one broke...or spun a bearing, I cannot remember which right now. I still use stock axles with a stock trans with just a Quaife. Some say I drive like a b!tch but nothing breaks. As far as the gasket, I cannot say because I used C2's steel gasket. It doesn't leak and its worth the money for peace of mind.
1. Stock 12v pistons make good turbo pistons. (very thick above top ringland) I suggest don't bother with pistons 'only', if you keep stock rods, then keep stock pistons and do head spacer.
Similar to: when you do a clutch, you do chains a guides while your in there.
Don't go thru the trouble (opening the motor) for pistons 'only'.
Stock parts have been proven to mid 400's whp over the long term.
Build the motor if you 'need' 500+.
2. non metal gaskets eventually fall apart. (think older V8 stuff)
5. Most 12v owners that hit 500whp have been at it for a while. They've seen a lot and broken ~everything once already, so the cars are pretty reliable by this point.
-Jeffrey Atwood C2 motorsports