Singh himself went to the trouble of having his modifications tested when he started out... But verification from Singh groove users is hard to find, especially as not many bother to really test them properly.
Always thought this was Unicorn stuff, myself, and probably not compatible with more modern multi-valve cars... Especially if you can't eliminate the effects of ECU relearning like these guys did by using a MegaSquirt.
Quote:
Originally Posted by Xist
I did not see an overall conclusion, just many tables and summaries after each series of tests. They certainly seemed thorough.
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The summary is before the tables. Lower fuel consumption and cooler operation in most conditions. I wonder, though, if it would have been better to do a "before" test for both engines... just to eliminate the effects of manufacturing variances which might cause one engine to naturally run better. But the preparation of the engines sounds pretty good, if they're telling e true, and they were pretty thorough, otherwise.
Strange that the wideband shows less oxygen in the exhaust and that the engine runs cooler even with less fuel being injected. Does the groove promote better burn by pushing the air towards the plug as the cylinder goes up?