[Slamaster1261]

im getting the jb4 tune with dual cone intake and up here in alaska i can only find 90 octane. will this octane be fine with the tunes that i have. help please, before i break something

[Elie335]

use map 5, it will auto tune it self to the octane you have.

[JayKay335i]

Shouldn't even be running the car stock on less than 91

[tomz17]

Originally Posted by JayKay335i

Shouldn't even be running the car stock on less than 91

Agree... I would be very wary of increasing the boost. Stock requires 91, and you are already pushing it with 90.

[tibra1]

Originally Posted by JayKay335i

Shouldn't even be running the car stock on less than 91

+1

min octane s/b 91..alaska doesnt have higher than 90..wtf?

[JayKay335i]

Try methanol injection

[tibra1]

yea hes gonna have too..or run NOS octane booster..but that will get expensive..each can will up a full tank 2 octane points

[Tom K.]

Read the manual - 91 is recommended for stock but 89 is the minimum. (87 for the NA motors).

Tom

[Johnny D]

Originally Posted by Tom K.

Read the manual - 91 is recommended for stock but 89 is the minimum. (87 for the NA motors).

Tom

I came to post this.

[tibra1]

So you would be ok putting the min 89..seriously?

10.2:1 compression ratio..can u say knock..knock

[JayKay335i]

Originally Posted by Tom K.

Read the manual - 91 is recommended for stock but 89 is the minimum. (87 for the NA motors).

Tom

Its the minimum, but would you run it? The only reason you can probably run it is due to the car being able to retard timing and making up for the crappy octane. Would you really tune your car if you couldn't even get 91?

The obvious choice here is the go with methanol injection if you really want to tune and be safe.

[smokinHawk]

well with slightly cooler temps in Alaska, it wouldnt be as bad running 91 down south in the heat.

[tibra1]

with the kind of temperatures the n54 sees that would still be risky..even more so if u r running a tune..running a tune on 91..is bad enuff but 90?..no way man sorry..meth injection is def the way for him to go if he has nothing else other than 90available

[Slamaster1261]

thanks for all the help, but the question is about the jb4 and the octane level. does it need to be at 93 octane or is there a safe mode with the jb4 where i would be ok running 90 octane because thats all we have up here in alaska? thanks

[smokinHawk]

map 1, or autotune, i dont believe one octane point will make that much of a difference.
plus how hot does it get up there? i doubt not as hot in cali which only has 91....

[Elie335]

Originally Posted by smokinHawk

map 1, or autotune, i dont believe one octane point will make that much of a difference.
plus how hot does it get up there? i doubt not as hot in cali which only has 91....

map 1 would knock to death, map 5(auto tune) would be the best

[fdriller9]

Originally Posted by tibra1

So you would be ok putting the min 89..seriously?

10.2:1 compression ratio..can u say knock..knock

Nope.....there's octane and knock adaptations on our cars. The DME will adjust the timing, valve lift, vanos etc. to run the engine without knock.

[tibra1]

Originally Posted by *********

Nope.....there's octane and knock adaptations on our cars. The DME will adjust the timing, valve lift, vanos etc. to run the engine without knock.

yeah stock..but with a piggy?

[Elie335]

Flash tune would be perfect, piggybacks require high octanes...

[tibra1]

I agree..but i dont wanna go down that road w the piggy guys here..lol

[Elie335]

anyway even the op seems doesn't even know what he's asking...

Thread fail

[fdriller9]

Originally Posted by tibra1

yeah stock..but with a piggy?

A piggy back tune modifies the signal from the DME to the engine. It doesn't alter the DME itself.

A reflash alters the DME. Whether the company decides to take the adaptations out or not is up to them. I don't see why you would take it out though.

The octane adaptation isn't just for adjusting to different octane ratings. It also adjusts to the mixture of the fuel. Not every tank you fill up is going to be exactly 93 octane or whatever you fill up with.