# Thread: Fuel Additive when using 87

1. ## Fuel Additive when using 87

Hey, so I take a vacation every year to a local lake where they only have 87 available, I know that the RXP's are only supposed to be ran on premium and last year I had all kinds of knock sensor issues after running their 87 so i'm looking for ideas as to how i can boost the octane of the fuel. i do have access to 100 and 110 race fuel at a local shop as well as C10. What would you guys do?

2. I'd go with VP StreetBlaze or C-10! 100 octane and unleaded! Or Avgas 100 low-lead.

Other options:
Torco Unleaded Accelerator additive (MMT)
Amsoil Motorcycle additive

3. We use, ACES IV Gasoline Formula http://www.bndautomotive.com/page/page/901818.htm

4. So would you recommend just mixing it with the 87 to get it to a higher octane rating?

5. Fot the Aces IV they do not recomend 87 use 89 and above.

6. I think I'd either haul 5 gallon cans or pull the ski to fill it up rather than use 87 gas in it.

7. Originally Posted by 1tommygunner1927
I'd go with VP StreetBlaze or C-10! 100 octane and unleaded! Or Avgas 100 low-lead.

Other options:
Torco Unleaded Accelerator additive (MMT)
Amsoil Motorcycle additive
where would one purchase these?

8. Stay away from Aviation fuel.
Take 5 gallon cans full of your normal pump fuel. This way you can be confident filling up.
OR
Take a 5gal can with 110 for mixing.
Here's a quick formula to figure your octane.
x=87 (or whatever the pump says)
y=110 (race fuel octane number)
z= octane after mixing

((87x + 110y) / (x + y) = z

Or
Mix 1gal of 110 with 4gal of 87 for @91.6 octane.

This has worked many years for me-with zero engine failures.

9. Originally Posted by 98gsxl951
where would one purchase these?
VP Fuels
http://www.vpracingfuels.com/vp-racing-dealers.html
http://torcoracefuel.net/pro-accelerator.html
http://www.amsoil.com/storefront/mob.aspx

If you use avgas or Torco, remove your O2 sensor.

10. 91 is the minimum and not the best for maximum performance
Imo aim for 93 to 94 for a home mix

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