Running 87oct in my Turbo'd GSX

[JustROLLIN]

Heres the thing... On ANY car with a knock sensor you can make up the cost difference when running premium gas. The ECU will advance timing until it sees knock, regardless of throttle position, except for WOT. As the ECU sees knock, it will pull the timing back and do it all over again. The ECU is designed to drive the car on the very edge of knocking for high efficiency. So, when running the 87 you are losing the MPG and in turn using nearly as much money, if not more. Not too mention, you can use the thousands of dollars of high performance goodies you bought for the car. So, logic dictates once again. Using 92 will not only allow you to push the pedal through the floor, but also net a better economic position when you arent into it.

[Shane@DBPerformance]

Originally Posted by JustROLLIN

Heres the thing... On ANY car with a knock sensor you can make up the cost difference when running premium gas. The ECU will advance timing until it sees knock, regardless of throttle position, except for WOT. As the ECU sees knock, it will pull the timing back and do it all over again. The ECU is designed to drive the car on the very edge of knocking for high efficiency. So, when running the 87 you are losing the MPG and in turn using nearly as much money, if not more. Not too mention, you can use the thousands of dollars of high performance goodies you bought for the car. So, logic dictates once again. Using 92 will not only allow you to push the pedal through the floor, but also net a better economic position when you arent into it.

That is not true. Most knock sensor equipped cars do not tune themselves based off of knock. DSMs run off of hardcoded timing tables, it will retard timing when it sees knock, but it will not run more timing than what is in the tables on its own.

[JustROLLIN]

Originally Posted by ecoli

That is not true. Most knock sensor equipped cars do not tune themselves based off of knock. DSMs run off of hardcoded timing tables, it will retard timing when it sees knock, but it will not run more timing than what is in the tables on its own.

When you say "most" remember the fact that DSMs are not "most" cars. I was unaware that DSMs will not push that ragged edge, but I can assure you that "most" cars do in fact run like this. Granted DSMs are a different breed seeing as they are turbo-charged. But, cars equipped with knock sensors do in fact push the limit in the name of gas mileage.

[MATCHBX]

Yeah, the 30-something mpg on 87 is awesome!!!! I'm almost having second thoughts about putting the talon back together. It's amazing how much that CRX keeps saving me. Even with 220,000+ miles on it.

I am very tempted to get a bike this year as well. I only have a 10 minute drive to work on backstreets.

[95tsi]

Who cares if prices jump up 20 cents... on a DSM it will cost you an extra $2.00 to fill the tank watch out. Are you gonna stop driving if they get super high?? Probably not. Just think of all the people driving over seas and what they pay, we got it good.

[Shane@DBPerformance]

Originally Posted by JustROLLIN

When you say "most" remember the fact that DSMs are not "most" cars. I was unaware that DSMs will not push that ragged edge, but I can assure you that "most" cars do in fact run like this. Granted DSMs are a different breed seeing as they are turbo-charged. But, cars equipped with knock sensors do in fact push the limit in the name of gas mileage.

Some newer cars and motorcycles may do this. But the 1990-2000 Hondas, Supras, 240sx, 300zx, etc with knock sensors only use it to retard timing from their base timing maps.