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I chalked the detonation up to a flat spot on my TPS. Yes, I did have the knock sensor connected and yes it was working. It takes about a minute for the normal timing maps to come back after it senses detonation.

Starion guys have been running 8.7 pistons for a good while now and I haven't heard much in the way of detonation complaints. You can run 8.7 on pump gas without problems. Personally, I wouldn't do it again without the oil squirters.

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Jamez: I run cheap gas myself. I don't think the Quest calls for premium. A assume the lower CR offsets.


You are braver than I. Premium isn't required per se, but it is recommended for the Quests.


Then again most of the Starion guy disconnect everything they can think of including the spark box and detonation sensor and wonder why they have a pile of melted parts. <img src="/forums/images/graemlins/notooth.gif" alt="" />

I built my first 8.7 motor about 16 years ago. I eventualy setteled on 7.8 to 1 as a good compromise. The fuel I had in Cali would still drop the timing/ boost back at part throttle.

The gas in the Portland area is a lot better.

Kevin

87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...