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Originally Posted by nissanfanatic
The rich condition isn't completely to blame. If you have to run AFs and timing like that, it sounds like you have hot IATs. What are the size and specs of that intercooler you have? I see what you're saying about why you have to run those AFs and timing, but that just means you have another problem. Pistons or not, 10:1AFs are not correct for a turbocharged engine. Thats more like a nitrous tune. And with that low of a comp., the timing shouldn't be that low either. Good luck.
Have you looked into Alcohol injection?
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My old FMIC is only a 13" X 6" X 4" core. The new IC has a core that's 18" X 9" X 2.5". With the old FMIC, IAT's run about 40°F over ambient at WOT @ 15 psi, which seems pretty reasonable, although I'm hopeful that the new IC may run a bit cooler.
One thing to keep in mind is that my motor, the 22RTE, is a SOHC that was originally designed as a forklift (!) motor. Toyota sold several generations of the 22R motor in pickup trucks and Celicas, and it was produced in various forms from 1983-1995 (and longer if you count the 20R motor that proceeded it). However, Toyota only produced a factory turbocharged version for three years, 1985-88, after which they introduced a normally aspirated V6 as an alternative to the normally aspirated inline 4. So this is pretty old technology, and it was not designed from the ground up as a turbo motor, or even a particularly advanced motor: in bone stock form, this motor made 136 hp at the crank @ 6 psi boost, on a stock CR of 7.4:1, and got around 17 mpg.
I've had a lot of fun with this project, and I've done just about everything that you can think of to this motor short of nitrous. It's currently making 222 rwhp on 91 octane pump gas, gets 15-17 mpg, and it's very drivable -- nice idle, smooth to drive, but with very decent power under the right foot. That's approx. double the stock power output, which ain't bad. Not sure if I would choose this motor again as the basis of a big buildup, but this project was my first introduction to turbo motors, and so seven years and several large bags of money later, here I am...
Anyway, I do agree with you, 10:1 A/F is not where I want to be, which is why I'm adding water injection, or water/methanol injection, and we'll see what that does. As for something else being the culprit, I'll stand by my assertion that the piston crown/combustion chamber interface is the cause of my high boost detonation; water injection will keep the mixture stable for a longer period of time, and this will be good enough for me. It isn't a solution that addresses the root cause, but it's good enough for what I'm after. I'll be happy to post here again in a couple of months after I get all of the new parts installed and retuned.
Thanks again for your feedback,
Jeff