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Registered:
May 2002
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Re: 4agze parts/build questions.
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Wed, 10 August 2005 07:41
 
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Injectors: common upsizing includes 440cc (7MGTE), 550cc (13BT), there are others that fit but those are probably the most common used. Suppliers: there are plenty, I got a set of new injectors through my local workshop, I reckon any place thats worth their salt could access what you want. The other option is to get some second handies (forums or importers) and get them cleaned and flow tested.
Cams: Wade are what a guy here is using, his car is getting tuned to day so can't comment on them it's a 4AGTE also. But Wade Cams are local and might be worth chatting to.
The factory forged pistons can be purchased from Toyota (oversized), these are good for 20psi and more  Getting these is good value too as they come in at around the $400 mark for a set. Aftermarket???? I do recall ads in the 4 cylinder mags over the years that advertised forged 4A pistons available locally. Head down the newsagent and have a flip through some mags Zoom, Hot 4's etc.
There are a number of people I associate with running around 20psi or more on stock rods and have done so for a long time (year or more) and have not had any failures. We have had one 4AGTE up over 25psi with no probs (factory pistons, stock rods). I have personally never seen or heard of a 4AGZE rod failure, I am sure it has happened but it can't be too common, they are strong looking compared to most factory rods, beefy.
My engine is internally stock as it came from Japan, it sees up to 21psi, and plenty of rpm, no probs at all. It's been doing this for years 
I read how your engine failed on your trip, I also heard last week of another turbocharged car (not Toyota) have exactly the same sort failure under similar conditions (towing, long period on boost = burnt hole in piston) and it was a stocker.
Good luck with the rebuild, let us know how the whole SC14 thing pans out when you have it sorted 
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