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I have an L28 block with a P79 head from a 1983 non-turbo. With head work, compression will be 10:1. Can I run on 91 octane or am I going to have to add an octane booster?

Also, I may lighten the flywheel to increase acceleration. Is it worth it for a fun daily driver?
 

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Unsure on the fuel.

On the flywheel, I will not go back to the stock flywheel. The lightened flywheel makes enough difference on my turbo to be well worth it. Generally helps the motor rev through the non boost portion of the rpm range very quickly, so I am sure you will notice a difference. It will depend on how much you lighten it. I am running a 10 pound aluminum with Centerforce II clutch.

Kevin
 

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What does that 10# flywheel do to the driveability of the car in stop and go traffic like cruises or traffic jams? Does it want to die between shifts or at idle? I have considered this upgrade, but didnt like the price or the possability of these bad habits rearing thier ugly head and making me dread cruising. Fuel mileage is another factor for me because I do drive it to work. One other Question, how much does the original flywheel on a 78 Z wieght and how much wieght can be taken off of a stock flywheel?
 

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Some owner indicated that the lighter flywheel would cause the car to lose momentum when you lift off the gas. I haven't noticed a significant amount of this. City driving is fine, however, you must remember that a turbo motor is only running at 8 to 1 compression ratio, so there isn't a lot o resistence. If you have a high compression motor there may be a significant drop in momentum if you lift off the gas in gear.

On the track I really like my setup, even though the rest of the car is currently stock. The quickness coming out of the corners is quite noticeable. I can hardly wait until all of my planned mods are finished. Unfortunately it is a long term plan.

Hope this helps.

Kevin
 
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