hey guys, i'm heading out to the track tomorrow, i got some 110 oct and wondering how high can i boost to be on the safe side. I don't really have time to search because i have to go to work in a bit...any suggestions thanks. oh, i'm boosting 21 right now.

 

Without a tune you shouldn't up it at all. You need to be tuned for the 110oct

 

 

you need to be tune for 110? because i did have my ecu reflash...

 

That has nothing to do with being tuned for 110oct. Anyway, I responded via PM, so you didn't need to make this thread.

I prefer you use high octane UNLEADED (100-104), but if you use 110, then mix it 50/50 with pump gas and shoot for 24-25psi.

 

i only got 5 gallons just for the track but there is a gas station that has 100 oct...if i pump 100 oct could i still run 24-25psi...

 

Yes, you can, but try to be on pure 100oct instead of a mix. Get your tank down to below the empty line, then put in 3 gallons of 100oct. Or, you can drain the fuel tank using the fuel return line, then toss in the race gas.

The 100oct will not affect your tune like the 110oct.

 

Whats wrong with straight 110 btw? I would think that would work much better than 100-104 as far as a fail safe?

 

Don't need a failsafe when you're not even leaning out the AFRs or adding timing and only running moderate 24-25psi. 110 is leaded and does better at leaner AFRs than at richer ones. With the unleaded 100-104, he'll be able to do no harm to his o2 sensor and get gains from the boost without a real need for leaning out the mixture.

 

the only problem that i have right now is that i already have 5 gallons of 110 ready for tomorrow. I'm heading to work in about 15 mins and its about an hour and 30 mins to get there...i don't get home till midnight and i'm heading out early in the morning so i don't think the gas station will open yet....that's my problem right now.

 

It's not a problem. 110oct is fine. You also don't need anywhere near 5 gallons (nor do you want to use that much) unless this is road racing or something that takes a long time.

Get your current tank down to the empty light, then add 2 gallons of 110 and race. Keep your fuel level as low as possible on the drag strip.

 

thanks for your input guys...the only choice i have right now is go 50/50 because i won't have time to get the 100 but maybe next time i'll just fill it up full tank and head to the track next month.

 

I just said you want to be as low on fuel as possible. Why would you go with a full tank? Crackmonkey...

 

i was writing my post when you had yours up...