well i have a 12:1 ls/vtec that was tuned on 93 octane, but they had to retard the timing a bit...im wanting to take it to the track with slicks, and advance the timing, but in order to do this i know i need some race fuel...im wanting to use Q16 but it requires more fuel since its oxygenated...can i just increase the fuel pressure a bit instead having it retuned?? or will it be ok to run str8 up without adjusting fuel pressure and no retune?

 

Q16 is way OVERKILL for a 12:1 compression motor. Just stick with Unleaded 110 or similar.

 

Buying and using race gas without a tune is a complete waste.

 

ive never heard of anyone having to retard timing on a 12.1 cr ls vtec setup. im advanced alot on my motor with 12.5 cr b20 vtec tuned on 93 with no issues.