RON rating question JDM vs US and OEM ECU timing

[vandale]

Hi. Is there a difference in the OEM timing between the JDM and US 91-94 NSX's?

Reason why I ask is that I have a 91 JDM and am running a DALI superchip and it only crossed my mind today that the DALI superchip will be tuned for US RON ratings which may not be the same as what we get at the pump here which is 98RON.

Experts, please chime in. Also this is not a chip discussion/comparison

Thanks

 

[solidol]

One fit all chips are garbage. No two engines are the same.

 

[Zoom]

Ditto. Dont play lottery with your engine life. Tune it properly or keep it stock.

 

[vandale]

Thanks. Yes have been considering a megasquirt solution.

 

[JD Cross]

This may help
http://retail.petro-canada.ca/en/independent/2069.aspx
Para 2 and 4 may be useful.

Our 91 octane has an RON of 97.2 which is pretty much what your 98 RON is

 

[prym8]

Does Canadian gas usually have 10% ethanol like your southern neighbors?

 

[JD Cross]

Does Canadian gas usually have 10% ethanol like your southern neighbors?

Shell 91 in Canada is ethanol free.
Most other 91 octane allows up to 10% ethanol.
Canada is not a big ethanol producer so other than Shell not sure how much is actually added by other brands.