Jump to content
Sign in to follow this  

91 Octane gas with modified L28 Turbo Motor...???

Recommended Posts

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

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this