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Minimum Octane Rating For Volvo 850?


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I just want to add. This car has 2 knock sensors..These are made for when you get low grade fuel.

as soon as pinging is heard,the car will pull timing untill it stops,then gradually add the normal timing back untill it hears pinging again....it does this in miliseconds

If your using a high compresison n/a motor its better to use supreme and more needed for obvious reasons....If your using a turbo its best to use supreme for optimal performance and obvious reasons..BUT ITS NOT ABSOLUTLY NECASSARY!

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I just want to add. This car has 2 knock sensors..These are made for when you get low grade fuel.

as soon as pinging is heard,the car will pull timing untill it stops,then gradually add the normal timing back untill it hears pinging again....it does this in miliseconds

If your using a high compresison n/a motor its better to use supreme and more needed for obvious reasons....If your using a turbo its best to use supreme for optimal performance and obvious reasons..BUT ITS NOT ABSOLUTLY NECASSARY!

Ya its fine for stock ecu, but when you install an upgraded ecu with more advanced timing tables, the ecu is going to advance until it hears knock, and using regular fuel will cause it to knock more quickly and the ecu will pull timing, thereby increasing the amount of detonation the motor experiences, as well as rendering the advanced timing tables that you are paying for to be useless.

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What are you going to calculate, give us some numbers since you know so much more than everyone else here.

This has to be the worst discussion I have ever read!

There is absolutely no calculations in this thread and the whole thing is filled with worthless opinions that are like assholes they all stink.

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What are you going to calculate, give us some numbers since you know so much more than everyone else here.

First, you need to know a few things and I don't know them.

What is the compression ratio?

What is the timing of the chip? What is stock timing?

What is the knock setting of the ecu? (aka. what is the computer knock sensors looking for?)

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I'm on Shell V Power 100 octane all day and there is NO difference to 98 (91 in the U.S.A ?) octane fuel. They made a test with an optimized (can handle 100+ octane) Audi V8 motor to check out if the octane number can give you more power... was not worth speaking about. Here for a tuned car 98 octane are enough. Anything else is luxury...

Sam

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Haha you pay a 1,000 for your chips yet i pay 200 for mine and expect 16hp gain. I don't care if i feel anything or not. It's all in your head :ph34r:

I am assuming this price is not including shipping...Get back to me with the info...

and also, BUMP.

I am curious what this did for you, you are supposed to have had the ECU back in your car today...probably too busy testing out the new found power than sitting doing nothing on VS like the rest of us :lol:

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