Quote:
Originally Posted by fred_boosted
Yes I'm not, just want begin to talk this topic.
And listen to adivces.
Why can't you just say why I'm wrong and tell us how to do thing right?
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I am very sorry for offending you. I am not very good at disagreeing.
Logically what you said didn't make sense because a thinner headgasket increases compression ratio.
Others could misunderstand what you said and then believe it to be a fact.
Quote:
Originally Posted by Ryephile
12.5:1 static CR with good DI is not a real problem if you want light boost. A quick calculation tells me that with 93 octane, 10PSIg boost would be plausible for a tuned-to-the-edge-but-still-reliable setup, assuming IAT's are kept rational and the knock control as as good as anything from the past 10 model years.
That said, just because the combustion chamber might be able to handle the BMEP, doesn't meant the piston lands, wrist pins, con-rods, crank, bearings, block, head gasket, or cylinder head can handle the increase in BMEP. There is always a fuse, a weak-link, and it'll take testing, measurement, and trial-and-error to determine what's the weak links are to reliably achieve the power level you're interested in.
Since most tuners have minimal real experience with DI tuning, there will either be an influx of amateur engineering experiments flooding the market, or there will be a slow ramp-up by competent tuners that take the time to do things right [which is rare, especially with an affordable car]. By all means, buyer beware!
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^This +1.
Quote:
Originally Posted by fred_boosted
It is CR... I can type japanese and chinese ... 压縮比
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Wonderful! It can always come in handy to have someone with your skills! Like today, Aki and Ichitaka were very busy with work.
Personally, I am very happy that the compression is 12.5:1. It is high enough to be even more efficient with E85 yet still be safe for low boost with pump Gasoline. For turbocharging, a lower compression is usually more inline with most tuner's/builder's goals and safer and more reliable. In this case, I think high compression fits better with 90% of the car's purpose otherwise they would have used one of Subaru's turbo motors