Quote:
Originally Posted by Mike@N54Tuning.com
91-92 octane is pretty bad. Don't expect much over Stage1 tuning with it. Maybe a handful of HP, some additional torque, and less lag.
For the +4psi setting only the 'boost over stock' field is changed.
Mike
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Interesting.
So the only way stage 2 can get the added power is by running a higher octane fuel.
I understand why higher octane will allow a higher boost level and perhaps more timing, but is this suggesting that the N20 has reached a limit with stage 1 and regular pump gas?
IOW, there are no more gains to be had from the stock engine using up to 93 octane fuel?
Also, is stage 1 tuned to take advantage of 93 for the areas that have 93?
Or, is stage 1 tuned for 91 to cover the whole US as that is the highest some people can get?
What about a 100 octane tune or option for those who don't want to run E85 and get less MPG?
I realize it's a piggy back so not much tuneability for different octane fuel.
But, it sure would be nice to have optional piggy's like one for 91, for 93, and for 100, and then the E85.
That way people can choose which one based on the fuel they can get.
I had a JB+ in my 135i and it had an adjustment for higher boost. I'm guessing that adjustment also allowed for higher octane fuel by turning the setting to maximum.
Does the tune for N20 and N55 have the same adjustment?