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Helpful ReplyHot!The MR2 Australia SW20

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Re: The MR2 Australia SW20 2018/08/08 17:28:35 (permalink)
+1 (1)
It's a Doc Race manifold. The waste gate inlet is as close to the turbo as possible - i.e. as far into the open collector as possible.
The ideal design for this manifold would be 2 x 38mm waste gates on either side of the collector, and at an angle that promotes maximum flow into the waste gates.
I am going to fit a single 50mm waste gate on one side with a very good flow angle into the waste gate inlet. That should do the trick without totally remaking the manifold.
It's mainly the bad angle with the existing design that is causing the problem.
robk
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Re: The MR2 Australia SW20 2018/08/09 00:14:30 (permalink)
0
I've had no trouble controlling boost anywhere between about 17 and 30 psi with a 44mm wastegate and the exhaust manifold pictured in my avatar.

President of the MR2 Club of NSW. 
There is an extensive build thread for my car here: http://www.mr2australia.com/mr2play/tm.aspx?m=18316
track_mr2
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Re: The MR2 Australia SW20 2018/08/09 19:13:44 (permalink)
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I'm hanging to see if the bigger wastegate and angle change fixes the problem too because when you look at the pictures on page 42 of this thread it really looks like only one collector is connected to the wastegate and definitely like the flow from at least two of the cylinders can bypass the wastegate. Will be interesting to see what happens after the weekend.

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Re: The MR2 Australia SW20 2018/08/09 19:51:17 (permalink)
+1 (1)
Here are some better photos of the manifold.
https://photos.app.goo.gl/gL7gVkChfp7JnUDn6
B24
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Re: The MR2 Australia SW20 2018/08/09 20:50:15 (permalink)
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I think that looks ok as its catching two ports plus it will scavenge from the collector. It is also a proven manifold so I go back to saying as I did before, it may be the spring pressure but a 50mm will not do it any harm. If it becomes too much, sell it and fit a 2GR..  

SW20 V6 circuit car. 
Wakefield Park: 1:07.7
Founder : MR2 Trackday Challenge 

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Re: The MR2 Australia SW20 2018/08/14 18:57:56 (permalink)
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Maaaaaate as I have said before, I don't want to make the car slower. I want to go faster! πŸ˜ŽπŸ‘πŸ˜
B24
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Re: The MR2 Australia SW20 2018/08/15 19:52:33 (permalink)
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Admin
Maaaaaate as I have said before, I don't want to make the car slower. I want to go faster! πŸ˜ŽπŸ‘πŸ˜


Lol. you are a funny guy! 

SW20 V6 circuit car. 
Wakefield Park: 1:07.7
Founder : MR2 Trackday Challenge 

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