Steve,
Hope you do not mind my reposting but you are a great source of very good info.
Here I go again.
I thought the following might be helpfull to know if a chip can not be used per class rules.
Quote:
Originally Posted by Steve W
The data on the chart is based on an 87-89 ECU unit. Although the 87-89s are supposed to put out 10 more hp than the 84-86s because of the programming, I have not seen an appreciable difference on the dyno between the two. At cold ambient temps, the 87-89 cars may put out a bit more hp, but at normal to warm temps, it seems as if the later programming puts out less power because it is more aggressive at trimming back overall ignition timing as the ambient temps rise. The later programming does put out a bit more low and mid end throttle response than the earlier cars, which give the impression that they are more powerful though. In either case, the power gains from chipping are the same no matter which year the car is. The chips are already tuned and tested assuming 91 octane with 10% ethanol, so that is not an issue. Also, as I mentioned, the Motronic programming is designed to trim back overall ignition timing irelative to the ambient intake air temps, so even if you are in 100+ degree heat, the programming compensates and keep you in a safe range...
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