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  #1  
Old 07-17-2007, 10:27 PM
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Default Horsepower rating difference in 86 to87

The horsepower rating for a 87 GN is Higher then a 86 GN. What change was made to get this horsepower difference?
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Old 12-04-2008, 09:30 PM
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Default Re: Horsepower rating difference in 86 to87

i think there was a chip update for the ecm, the hp difference is only 10hp
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Old 12-04-2008, 10:24 PM
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Lightbulb Re: Horsepower rating difference in 86 to87

Plus, the Corvette's HP changed, so they could advertise more.

http://www.gnttype.org/forums/showthread.php?t=3447
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Old 12-05-2008, 10:59 AM
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Default Re: Horsepower rating difference in 86 to87

Actually, the chip update thing was more for cold idle and cold start emissions (and there was another "recall" chip that came later in 87 too).

The drivetrains are basically identical and the HP was pretty much advertising trickery.

If you notice, the ratings are at different RPMs in 86 and 87.
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Old 12-25-2008, 03:30 PM
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Default Re: Horsepower rating difference in 86 to87

The GNX is also a full second faster than the GN in 1987.
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Old 12-25-2008, 03:37 PM
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Exclamation Re: Horsepower rating difference in 86 to87

There are equipment reasons for that. (i.e. turbocharger, intercooler, exhaust)
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