Thread: performance
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Old 05-12-2011, 04:28 AM   #7
cre

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AFAIK, the JZ series was the first to see production use of hypereutectic alloy... the JZ pistons aren't an uncommon upgrade for a number of earlier Toyota blocks (including the 7M) for this very reason.

Here's a thread where they recommend just that (from SF ): http://www.supraforums.com/forum/sho...tectic-Pistons

For those who want to know more though:
http://en.wikipedia.org/wiki/Hypereutectic_piston


EDIT:

So, do you have a link to the aforementioned article?

The KVAFM is actually a very good and accurate system.

Back to the original discussion though, over 12psi on a stock CT-26 isn't advisable. Beyond 13 or 14psi (ambient conditions always a consideration) the CT-26 isn't efficient and tends to blow hot to the point that you may actually lose power and you significantly increase the risk of damage from detonation; The compressor isn't large enough to provide a cool charge at that volume.

EDIT2:

I'm still looking.. Looks to me like the JZ series and UZ series were the first blessed with this hardware from what I can find. I suspect that if Toyota were using it earlier it would have been in their race engines; This includes limited "not for market" 7Ms: see: 1988 Group A Supra (not to be confused with the Turbo A model which was sold to the JDM in a quantity of only 500).

This has taught me more about the process and it's effects than I had ever planned on knowing. I think I'm done looking now... if you find that article or anything else I'd like to see it.
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Last edited by cre; 05-12-2011 at 08:58 AM.
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