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Turbo questions, grooves ?
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DougG View Drop Down
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Joined: 20 Sep 2009
Location: Mo
Points: 8108 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DougG Quote  Post ReplyReply Direct Link To This Post Topic: Turbo questions, grooves ?
    Posted: 04 Mar 2019 at 6:02pm
Looking at the Cowtown shootout tractor pull rules in KC, and they really state - no map enhanced grooves in certain classes , whats the map enhanced grooves ? Heard of this , but never had to worry about it back when we were hot and heavy in it

Edited by DougG - 04 Mar 2019 at 6:03pm
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Dnoym N. S. Can. View Drop Down
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Joined: 03 Oct 2009
Points: 544 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dnoym N. S. Can. Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2019 at 6:55pm
try this



 I think this mite be what there talking about

   B:-)     Dnoum
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DougG View Drop Down
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Points: 8108 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DougG Quote  Post ReplyReply Direct Link To This Post Posted: 04 Mar 2019 at 7:57pm
Thanks for that link, probably just it
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injpumpEd View Drop Down
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Points: 4916 		Post Options Post Options   Thanks (0) Thanks(0)   Quote injpumpEd Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 2019 at 7:15am
The you tube video shows a custom made cover that is adjustable in the width of the map groove. The majority of turbos out there on pulling tractors don't have any adjustment to them. Many will machine it to various widths. Many pulling classes limit what can be done to the map groove, and some even don't allow a slotted type of charger, so smooth bore only. Map width enhancement groove or slot. Also called a bleed slot. When turbo gets close to stall, the excess boost pressure is allowed to bleed out the slot and back around to the intake side of the compressor wheel. Many people think it allows more air to enter. Now in the case of a too small a turbo on an engine, it might take additional air in there. I'm no turbo expert, just know enough to sell and size them most of the time. lol!
210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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