Herb Posted February 12, 2018 Share Posted February 12, 2018 So I am swapping in an L28Turbo with an upgraded T3/T4, p79 A-Grind Cam, p90 Head with dished pistons, Megasquirt, larger injectors, etc... I know the compression starts at around 7.4 for turbo motors and the N/A motors are around the mid 8's. My buddy has a 76 280z with a stage 2 cam and exhaust and runs 87 octane with no problems. So my questions are: 1. With this turbo set up, can I run 91 octane or lower? I had 2 turbo cars already, 90 VW Corrado and 1999 Audi A4, I always had to run 91 octane. 2. Is there an amount of boost where 91 octane will not work anymore? The turbo I have says 18psi max, but I don't plan on putting it that high, maybe around 15psi for weekend driving and 10psi for daily driving. Any info would be great. Thanks Quote Link to comment Share on other sites More sharing options...
HuD 91gt Posted February 12, 2018 Share Posted February 12, 2018 You can use whatever gas you tune it for. But there is a reason turbo cars usually run higher octane fuel. 1 Quote Link to comment Share on other sites More sharing options...
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