Quote:
Originally Posted by Apex-Apex
I'm not sure if it's safe but their 93 tune is meant with the larger pulley. From what I've read, the smaller pulley is 11.5 psi.
100mm for the smaller
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Exactly, both the HKS 91 and 93 tunes are tuned for the standard pulley (110mm).
Only the HKS E85 tune is tuned for the smaller (100mm) pulley. You can run the smaller pulley with 93 octane, or even 91, but you have to have the fuel and tune to support it. That's just not a solution HKS sells.