Quote:
Originally Posted by shiv@vishnu
What Laguna said wasn't biased and was perfectly true. Running 25psi of boost on 91oct requires very low ignition advance. Which will result in very high EGTs. This is fact.
Running 25psi of boost on a single 62mm or twin GTXs should make ~675whp on a well tuned engine. If you are making 100whp less at the same boost pressure, where do you think that all that extra combustion energy is going? It's not pushing the crown of the piston downwards (into kinetic energy). Instead, it escapes in the form of heat that is then passed into the cooling system and into the exhaust. And 100whp worth of heat A LOT. Engines don't like this. This is why experienced tuners carefully find the balancing point between thermal efficiency and power given a fixed octane restraint.
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There was more to my post you quoted. They weren't on a finalized tune, they were only a week into preliminary tuning and broke the record for 91 pump gas on a just-for-fun dyno run. Once we see some finalized tuning and higher octane, i'm pretty confident the numbers will be greater than the single kits have currently put out.
We don't have any EGT data, so to say EGT's are at a dangerous level is fiction. Of course more boost=more heat, but that's not what was originally said.