GIBBS
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Registered: 22nd Feb 01
Location: Kent, Jap Car Importer :)
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http://www.mototuneusa.com/break_in_secrets.htm
very interesting article, and makes you think.. seeing as i'm close to finishing the rebuild of the ca18det (with a smaller turbo unfortunately  )
i'm interested to see proper techie's views on this, a perfect ring seal is what i'm after.
Matt
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Ditch
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Registered: 29th Nov 02
Location: St Albans Drives: JDM Celica GT4 WRC
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worry about not letting the car idle for long periods, and make sure it gets a spread of different loads on the first 100-200miles or so. Just jumping on the motorway and sitting at 60mph is pointless, and will not give a proper ring seal - and as you rightly say, your looking to wear in the piston rings most importantly after an engine re-build.
Find a nice long gentle hill, on a quiet A road, and repeatedly accelerate up it at different throttle positions, slowly building up the rpm's
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Ditch
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Registered: 29th Nov 02
Location: St Albans Drives: JDM Celica GT4 WRC
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varied and increased loads is the key 
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GIBBS
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Registered: 22nd Feb 01
Location: Kent, Jap Car Importer :)
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but what kind of power and rpm should be put down on the run in ? most will say not above 3k rpm for first few hundred etc.. i don't think i'll cane the arse off it, but i don't wanna bitch about
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Ditch
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Registered: 29th Nov 02
Location: St Albans Drives: JDM Celica GT4 WRC
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obviously keep the revs as low as possible to start with, 3k sounds reasonable, but as its a turbo engine your going to have to use boost at some point.
where do you expect full boost?
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Tom
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Registered: 3rd Apr 02
Location: Wirral, Merseyside
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Imo you'll have to go on boost at least 10 times in the first 100 miles it's not gonna do it much harm plus u might need to overtake 
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Ditch
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Registered: 29th Nov 02
Location: St Albans Drives: JDM Celica GT4 WRC
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the site you posted makes interesting reading 
That fella reckons you have 20 miles to get a decent ring seal... but how many cars has he worked on?
To be fair, i have only ever run in motocross bikes after new piston rings, and I know your supposed to use all the gears, and all the powerband as soon as the bike is up to operating temperature...
One very good point which I missed is to use the engine to do most of the braking for the first few vital miles... slow down the gears gently though!!
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