mdelorie Posted July 31, 2003 Report Share Posted July 31, 2003 Is this possible? or is it permanently set? Quote Link to comment Share on other sites More sharing options...
GnatGoSplat Posted July 31, 2003 Report Share Posted July 31, 2003 If the Lumina is anything like the Grand Prix, it's possible. There's a laser-etched resistor on the main circuit board that controls the speedo (which is basically just an electromechanical voltmeter). The resistor is the black paint looking stuff on top of a white chip looking thing. You can parallel something like a 10-megohm resistor across it to decrease the speed reading. I think you would have to add resistance to increase the speed reading. Quote Link to comment Share on other sites More sharing options...
mdelorie Posted July 31, 2003 Author Report Share Posted July 31, 2003 There's no exact science to follow in going about it though? Quote Link to comment Share on other sites More sharing options...
RomeoZ34 Posted July 31, 2003 Report Share Posted July 31, 2003 You might be able to have it professionally done? Quote Link to comment Share on other sites More sharing options...
GnatGoSplat Posted July 31, 2003 Report Share Posted July 31, 2003 My thought was to use something like a 10-turn variable trimmer resistor. That way you could fine tune it. Although funny thing is, a simple 10-megohm (or maybe it was 1megohm?) across the resistor in my GP made it read PERFECT and matched the HUD exactly. Quote Link to comment Share on other sites More sharing options...
hazmatic Posted August 2, 2003 Report Share Posted August 2, 2003 what about in a regal i been noticing im 10 mph off Quote Link to comment Share on other sites More sharing options...
GnatGoSplat Posted August 5, 2003 Report Share Posted August 5, 2003 If it's digital, there's no adjustment that can be made. If it's 10mph off, that means there's a problem somewhere like a mismatched MEMCAL or tranny. Quote Link to comment Share on other sites More sharing options...
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