Higher octane with late model cars
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  1. #1
    Phasis
    Guest

    Higher octane with late model cars

    Does anyone have any info about what difference Optimax and octane booster will have on power output.
    I did a dyno on Friday night and got 164hp at the engine. My 306 S16 is only rated for 150, and an extra 14hp seems alot for an exhaust and cone filter. I did have optimax in, so could the extra power be more attributed to this?

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    1995 306 S16

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  2. #2
    Guru davemcbean's Avatar
    Join Date
    Apr 2001
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    Camden NSW & Selwyn NZ
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    2,334
    From what I've read, on an otherwise stock engine, the usual cone filters might gain you (on average) about 2% (if it is drawing cold air), the exhaust might gain you 2-15% (depending on how good it is) and the high octane fuel would allow the computer to take advantage of everything, without having to retard the spark (to avoid pinging). I don't think a 14hp gain is unreasonable, on a 150hp engine, considering you've got these 3 factors working together. After all, it is still less than a 10% improvement.

    Dave
    NZ Fleet
    1976 504 Ti
    1984 205 GT twin carb
    1991 205 SI 1.6GTI motor
    1994 106 Xsi
    1996 Mondeo V6
    Aus Fleet
    1955 203C
    1997 Civic Cxi (great allrounder- revy, flexible, nimble, comfortable , economical, simple and durable )

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