Quote:
Originally Posted by Walter_
The v6 is direct injection it is rated at 87. See below for how it does it.
Direct Injection (DI)
As the name suggests, DI involves injecting fuel directly into the cylinder. While this system does provide greater control of the combustion cycle, that is not the greatest benefit of DI.
Because it is sprayed directly into the cylinder, and not warmed first in the manifold on the other side of the intake valve, gasoline entering the cylinder actually cools the combustion chamber. This cooling effect reduces the chances of fuel “pre-ignition,” which has two significant benefits.
First, DI improves engine efficiency by allowing the use of higher compression ratios. Simply, the mixture of air and fuel can be squeezed more tightly by the piston before it is ignited—this allows for a more complete fuel burn and thus better energy utilization.
Second, the need for more-expensive, higher-octane fuel is reduced. A fuel’s octane level determines its resistance to pre-ignition. As DI reduces the occurrence of pre-ignition, it enables an engine that might otherwise need premium fuel to run on mid-grade or regular-grade gas.
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The 6th gen camaro 3.6 V6 has 11.0 to 1 compression ratio, that and high heat and especially with a manual trans is a recipe for spark knock with 87 octane. Spark knock sensors (very sensitive ones) retard spark at any hint of spark knock because of that 11 to 1 compression ratio. Retarding spark is timing loss or reducing timing which = power loss plain and simple. The car has high timing tables and low timing tables in the ECM. Forget 0-60 times, run the the car down the 1/4 mile on a track. My 6th gen manual trans 1LT base V6 camaro ran 13.5 on the stock all season tires and everything bone stock with a very steady diet of 93 octane. Let me hear from a manual trans guy running 87 octane only on a bone stock 6th gen V6 camaro in no less than a 1500-2000 DA day who has done better.