High Test Gas or Regular?

[Baldy_54]

Is the XR able to run on regular gas if it is tuned for it? Just as an every other day car would it be okay to de-tune it? Just by changing the dist. advance.

[SvoSierra]

Others will say no, but I have one XR I de-tuned 1 degree timing and limit boost to 10psi. I ran 87 octane and got a little knock. I now run 89 and no issues. Again, some call me stupid.

[Maurice S]

If you keep it at 9psi, or just disconnect the wastegate rod for NO boost, you should be ok. it'll be a dog though.

[mikerobison]

You can run low octane fuel with the turbo is working order, and dist. in stock timing, just don't drive like a flippin maniac. Keep your right foot off the throttle and not buried into the floorboards.

[Maurice S]

You can run low octane fuel with the turbo is working order, and dist. in stock timing, just don't drive like a flippin maniac. Keep your right foot off the throttle and not buried into the floorboards.

LOL! this is very true...However, boost being more addictive than cocaine, crack, crank, meth, sex...etc...well...it's not always practical.

I should develope and market....Boost-erette GUM....yeah...that's the ticket. Give's you the SENSATION of 20psi boost even while driving a Yaris.

[thesameguy]

My stock-engined '86 runs fine at 8psi on 87. I don't get any knock even under hard acceleration...

[richardcurtis]

If you drive, say, 10,000 miles a year, and you average, say, 20 mpg., and let's say for the sake of discussion that the difference in price between 87 octane and 93 octane is 26 cents a gallon, you'll save $130 a year.

[thesameguy]

Yeah, but what if the price difference is 27 cents per gallon? Think of all the PBR you'd be able to buy with the savings.

I'm just saying...

[Ray]

...now, with the cost of fuel being so high so the difference in percentage of cost being so low...





enjoy the car.

run the premium fuel.

[Baldy_54]

Ray, you are right, since I am using Historic Tags, and limited to 5,000 miles per year what difference does it make. NONE

[xrattiracer]

dont assume that you will get the same mpg on both flavors. i would bet that youll get less mpg with the lower octane fuel, offsetting the savings to some extent.

[GeneticRehab]

How much money do you think you will save over a year? If you have good driving habits, then this would not be a problem. To me. I dose not matter weather you have a honda or a merkur. Driving habit dictate gas consumtion. You can get up to 25 to 30 mpg with a good stock tuned XR. Well good luck on you work.

[thrashperformance]

LOL! this is very true...However, boost being more addictive than cocaine, crack, crank, meth, sex...etc...well...it's not always practical.

I should develope and market....Boost-erette GUM....yeah...that's the ticket. Give's you the SENSATION of 20psi boost even while driving a Yaris.[/quote]

i am not addicted to the boost, i can quit any time i want to

[xr4man]

i ran this experiment with my saab 900 turbo. i adjusted the stock boost controller all the way down to basic boost (5pai) and filled up with 87. it ran fine. i took it on a 200 mile highway trip. then the next day i filled up with 93 and cranked the boost up to about 18 or 19 psi. i took it on a 200 mile highway trip. after wards i calculated gas mileage and figured out cost per mile based on the mileage and cost of gas for each test. what i found was that on 87 with 5psi of boost, the car got such crappy gas mileage that it was actually MUCH cheaper to run at high boost with 93 octane gas.

so all of you that are thinking that you can turn the boost down and drive for cheap on 87 octane, you are just fooling yourselves. a turbo motor running basically in NA mode will make such little power that you will get much worse gas mileage.

[John Brennan]

In two decades and a quarter of a million miles, I've never run anything but the best Premium I could get in any of my Merkurs and never would.