so could i run lower 87 octane without any harm done since there are higher compression quads running 87?? right now i run a 50/50 mix of 87 octane and 91 octane

 

So H.T. , you say you stay below 12:1 so that you can stay away from having to run race gas / 110 octane. So then I can only assume that your running a blend of ?+?....

If so , what would you do if you were in a pinch and had to run pump gas ?

 

11.5:1 = 91 octane pump gas. No need to blend.

 

Very interesting thread[img]i/expressions/face-icon-small-wink.gif[/img]

So whats the compression on the stock DS motor?

 

DS-E....
So from 11.5:1 up to 12:1 you can run Premium Pump gas but just above 12:1 you need to take the big step to 110 octane.... that seems odd. But this (11.5:1 w/ 91 ) would be for if you were in a pinch right? Not what you would want to run as the rule... yes ? no?

 

In stock form the DS has a 9.7:1 compression ratio

 

Seems kinda low compared to the new yam, so thats why they are so quick for 450's, sneaky

 

Yup...and they are very light[img]i/expressions/face-icon-small-wink.gif[/img]....Nice quads for sure. I really like it win a win a drag race aginst one of them when theve been moded.[img]i/expressions/face-icon-small-smile.gif[/img]

 

could you run normal pump gas such as 87 octane in a stock ds? And would you get more power

 

You could and it will act as though you have advanced the timing. Doubt though that you'll notice the power increase if any. If you deside to do this. I would sugest doing plug checks everytime once in a while expecially as ambiet temps change. As well as anytime you change altitudes. Your looking for any sign of small chunks / deposits on the plug. This may be signs of pre ig or detonation. Very bad for your motor.