| T.R | Title | User | Personal Name
 | Date | Lines | 
|---|
| 770.6 | GSI Octane plug, or is it? | SMAC10::NEALE | Steve Neale, UK Defence Agencies | Tue Mar 06 1990 18:06 | 6 | 
|  | My GSI has a thingy under the  bonnet like other Cavaliers that you can change
depending on the octane rating of petrol you use. Now the GSI does this by
electricty, and my car just has A or B on either side. Anyone know what this
does to a GSI engine.
S
 | 
| 770.7 | The small reply note :-) | UKCSSE::RDAVIES | Live long and prosper | Wed Mar 07 1990 09:41 | 6 | 
|  |     It tells the the electronic ignition to retard the timing of the spark.
    This is all the conversion normally is anyway. The other factor that
    really determines unleaded suitability is hardened valve seats which
    all the vauxhalls now have.
    
    Richard
 | 
| 770.8 | Would be pointless on a GSI | SMAC10::NEALE | Steve Neale, UK Defence Agencies | Tue Mar 13 1990 16:43 | 6 | 
|  | But the GSI has a Bosch fuel injection system that does this automatically.
Like the Saab Turbo's do.
So an A/B thing can't be to do that.
Steve
 | 
| 770.9 | moved by mod, try dir/title=GSi next time | UKCSSE::RDAVIES | Live long and prosper | Fri Sep 14 1990 13:33 | 14 | 
|  |             <<< MARVIN::DISK$TOOLS:[NOTES$LIBRARY]CARS_UK.NOTE;1 >>>
                            -< CARS_UK conference >-
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Note 1228.0                      GSi2000 speedo                       No replies
ODDONE::TILLING_S                                     8 lines  14-SEP-1990 12:40
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    I am now the happy owner of a Cavalier GSi2000. The only thing
    is I feel the speedo over reads. If I travel at a constant speed
    and then re set the trip computer the avarage speed indicated
    is at least 10 mph slower than on the speedo.
    
    Has anyone else seen this problem and does anyone know of a fix??
    
    Simon
 | 
| 770.10 | Try getting it re-calibrated... | IOSG::MARSHALL | What is a !fm2r anyway? | Fri Sep 14 1990 13:42 | 8 | 
|  |     By law, speedos cannot under-read.  They may legally over-read by up to
    10%, I think.  It sounds like yours is at the limit...
    
    Alternatively, do the trip computer and speedo get their inut from
    different sources?  If so, changing the tyre size (for example) might
    affect one and not the other...
    
    Scott
 |