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Max Horsepower

How much hp an original engine capable of? I changed the connecting rod bolts to ARP. I has read something about 650 hp???

Thanks in advance

Jimmie

Old 05-23-2013, 03:54 AM
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I don't know about water cooled engines but air cooled the most HP that I know off is 1365rwhp out of a 3.6
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Old 05-23-2013, 04:24 AM
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Sorry my mistake it is a 930 engine 3.3l
Old 05-23-2013, 04:41 AM
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I'm at 720rwhp out of a 3.2 with 3.3 pistons and cylinders.
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Old 05-23-2013, 04:48 AM
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Has you done anything more to the engine or is it stock??had any problems??
Old 05-23-2013, 05:02 AM
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Stock? with normal bolt ons, bigger boost spring, new turbo, exhaust, headers, bigger intercooler, most guys get in the high 300's HP range. More than that you need to work on the internals. The engines do not normally take more than about 1.0 BAR of boost on the stock CIS (Fuel injection system) without failing (usually catastrophically).
Old 05-23-2013, 06:44 AM
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I would get better rods if going for over 500HP. I had one break with ARP studs on dyno at that number with stock rods. The factory went all the way to titanium with their higher HP motors. Their are a number of better rods between stock and titanium to choose from.
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Old 05-23-2013, 07:11 AM
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I would like to have between 600-650 bhp or 550-600 whp. That is why woundring if stock engine can handle that.. Will have EFI and E85 fuel.
Old 05-23-2013, 08:20 AM
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I've read that you only need to replace rods, not due to strength, rather for lightness.
Old 05-23-2013, 07:20 PM
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Granted, we check and recondition the rods before reusing, but have repeatedly done over 500whp on stock rods fitted with ARP bolts.
Highest thus far is 752whp. Over 3 years on that engine, zero issues.
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Old 05-23-2013, 10:59 PM
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If i am not mistaken, the turbos issue is the smaller rod bolts correct? you can use the bigger carrera or aftermarket though.
Old 05-23-2013, 11:56 PM
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Correct me if I am wrong, but the issue with the smaller rod bolts is a rev related issue not a hp related issue. If you keep to standard rev limits then the rods are not a problem. I know my New Zealand mechanic used factory rods when he built motors for 993GT2 race cars that ran 24 hours at Le Mans.
Old 05-24-2013, 07:07 AM
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Quote:
Originally Posted by Groovie Ghoulie View Post
If i am not mistaken, the turbos issue is the smaller rod bolts correct? you can use the bigger carrera or aftermarket though.
3.2 Carrera and 3.3 turbos share the same crank (almost), rods and rod bolts. The SC has larger rod bolts, IIRC.

911-32 is right; the rod bolt issue is most often provoked by over-revs - but 3.2's do sometimes drop rod bolts for no good reason as well.

ARP bolts are a good investment in my book, even on a stock motor.

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Old 05-24-2013, 07:19 AM
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