BeerTurbo Posted February 24 Share Posted February 24 Hey just wondering on anyone's experience fitting larger throttle bodys to a barra? I have seen the dual std setup but wondered how a big single or event the gt500 twin throttle goes? is there any easy alternative the std pcm is happy with? Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted February 24 Share Posted February 24 Everything is easy when you know how 😉 It's something I've thought about doing just to have the data for it. Quote Link to comment Share on other sites More sharing options...
BeerTurbo Posted February 24 Author Share Posted February 24 old mate here said there is a small gain in running two throttle bodys. https://www.facebook.com/watch/?v=2262823637210304 just seems overkill to go two std 70mms and that's why i wondered if the Shelby twin 60mm would be benifical at all. Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted February 25 Share Posted February 25 I've made over 1300hp through a single stock BF TB. I wonder if it would have made more with a bigger TB? Quote Link to comment Share on other sites More sharing options...
BeerTurbo Posted February 25 Author Share Posted February 25 3 minutes ago, Puffwagon said: I've made over 1300hp through a single stock BF TB. I wonder if it would have made more with a bigger TB? oh sorry im talking NA Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted February 25 Share Posted February 25 If you want to see if your TB is a restriction, you log MAP and see if it holds 100kpa or falls down at the end to less than 100kpa. No restriction will hold the same amount of vacuum, some restriction will be more vacuum ie less than 100kpa. My VN V8 through the stock intake manifold drops to 85kpa up top, a very clear restriction. Quote Link to comment Share on other sites More sharing options...
BeerTurbo Posted February 25 Author Share Posted February 25 19 minutes ago, Puffwagon said: If you want to see if your TB is a restriction, you log MAP and see if it holds 100kpa or falls down at the end to less than 100kpa. No restriction will hold the same amount of vacuum, some restriction will be more vacuum ie less than 100kpa. My VN V8 through the stock intake manifold drops to 85kpa up top, a very clear restriction. i like that scientific. went over a couple of the dyno logs and after 5500 rpm it starts slowly going down but it only goes to 96KPA. Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted February 25 Share Posted February 25 So there's a restriction up top then. A bigger TB will likely make a difference in that area. Not really an issue for a daily driver but a reasonable mod for the person who wants the absolute most out of it. Quote Link to comment Share on other sites More sharing options...
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