How big is a penny?
03-16-03, 05:36 PM
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How big is a penny?
I am trying to see how big I have ported my wastegate so far and can only really compare it to coins. Anyone know how big(or can measure for me) a penny is? How about a nickel? In millimeters would be great. TIA.
03-16-03, 05:46 PM
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I've heard that the hole can be bigger than the flapper. This is correct, right? Something like the flapper has to cover 75% of the hole, right?
Oh and the stock S4 WG is 12mm, right? Right now I am at about 18 then, how big do you think I need to keep boost down to 10psi or lower? Thansk alot for the help.
Oh and the stock S4 WG is 12mm, right? Right now I am at about 18 then, how big do you think I need to keep boost down to 10psi or lower? Thansk alot for the help.
03-16-03, 06:26 PM
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03-16-03, 06:41 PM
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Originally posted by Cheers!
please read this thread
https://www.rx7club.com/forum/showth...hreadid=155100
please read this thread
https://www.rx7club.com/forum/showth...hreadid=155100
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03-16-03, 09:38 PM
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Bump for those questions up there. PLUS, I was wondering what size WG everyone thought was needed to control boost with my turbo(TO4B compressor housing/wheel, P-trim turbine wheel, 360 degree thrust bearing on an S4 turbo)? Like how many millimeters. I know that a standard external wastegate is alot of times 35mm, so what should I shoot for with my WG? Like 25mm?
03-19-03, 04:36 PM
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Originally posted by joelu
stock the wastegate is 15mm the door is 20mm i ported to mine to 22m. the door now covers 86% of the hole i think. i still have to see how it works.
stock the wastegate is 15mm the door is 20mm i ported to mine to 22m. the door now covers 86% of the hole i think. i still have to see how it works.
03-19-03, 04:53 PM
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i measured the hole with a telescoping gauge and micrometer throughout the process. im pretty sure it was 15mm. either way its bigger now
. i did the math and the door covers 83% of the hole at 22mm. im soo tempted to go that little bit bigger. if i make it 23mm the door covers 76% but it would probably lag a lot more.
. i did the math and the door covers 83% of the hole at 22mm. im soo tempted to go that little bit bigger. if i make it 23mm the door covers 76% but it would probably lag a lot more.
03-19-03, 05:36 PM
#14
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Originally posted by $150FC
you can get bigger flappers, you know. That's how BNR ports stock wastegates to ~35mm.
you can get bigger flappers, you know. That's how BNR ports stock wastegates to ~35mm.
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