Aarons Drag CQ: 3-29 anodized and welded stuff. AN lines
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fasterthenrs2
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zerb
- speeding-g60
- Posts: 2152
- Joined: Fri Mar 01, 2013 10:46 am
not your eyes.... .050" = 1.27mm, so not a straight across comparison, but best info i could find. the head is blueprinted so i know everything about it, from where the coil springs bind, to compressed height and everything to know about them.
stock cam specs (looking on interwebz)
Max lift Intake Duration..050” lift Max lift Exhaust Duration .050”lift
Stock 7.65mm 184 9.29mm 196
Web 7.87mm 196 9.83mm 206
MAX intake lift dur @ 1.00mm lift exhaust lift duration @ 1.00mm
1003756 9.55mm 227 11.65mm 235
so yeah, they got just a lil more to them.... it isnt your eyes Janis....
stock cam specs (looking on interwebz)
Max lift Intake Duration..050” lift Max lift Exhaust Duration .050”lift
Stock 7.65mm 184 9.29mm 196
Web 7.87mm 196 9.83mm 206
MAX intake lift dur @ 1.00mm lift exhaust lift duration @ 1.00mm
1003756 9.55mm 227 11.65mm 235
so yeah, they got just a lil more to them.... it isnt your eyes Janis....
- speeding-g60
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- Joined: Fri Mar 01, 2013 10:46 am
- speeding-g60
- Posts: 2152
- Joined: Fri Mar 01, 2013 10:46 am
- speeding-g60
- Posts: 2152
- Joined: Fri Mar 01, 2013 10:46 am
and the exhaust mani, its coming along. hopefully it gets finshed soon so i can get this car back here and work on it... goal is now Aug 30th i think.... Pacific Waterlands show.....
but the manifold is a true twin scroll set-up. paired cyl's into each volute. and yeah, i know 4 is a little longer than 1, but it will be alright i think....


but the manifold is a true twin scroll set-up. paired cyl's into each volute. and yeah, i know 4 is a little longer than 1, but it will be alright i think....


- speeding-g60
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- Joined: Fri Mar 01, 2013 10:46 am
- speeding-g60
- Posts: 2152
- Joined: Fri Mar 01, 2013 10:46 am
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AudiSport4000
- Posts: 795
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- Location: Fort Wayne, IN
Wow, that is insane! I love it 8)
1986 4kq Commemorative Design
2012 Jetta TDI
Follow me on YouTube at Mike's Virtual Garage!
https://www.youtube.com/channel/UCaMvwkjuW7Ziy5pmfVh_PJQ/
2012 Jetta TDI
Follow me on YouTube at Mike's Virtual Garage!
https://www.youtube.com/channel/UCaMvwkjuW7Ziy5pmfVh_PJQ/
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HT Motorsport
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- Joined: Wed Feb 27, 2013 11:56 am
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a_CQ
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qezel
a_CQ wrote:Sweet....question on exhaust mani...why not run 1+2 to front and 3+4 to rear....that way #4 would be shorter..
i don't know too much (next to nothing) about twin scrolls but going on pure speculation.. the idea is to have direct 1/4 into one scroll because they rise and fall together as well as 2/3 into one scroll because they also rise and fall together.. thus giving each scroll a constant and even pulse of exhaust gas pressure?
yup. to keep even pulses. even (some of) the old VW 8v manifolds had two outlet ports and a dual tube downpipe
1+4 and 2+3
http://i18.photobucket.com/albums/b116/ ... 090010.jpg
1+4 and 2+3
http://i18.photobucket.com/albums/b116/ ... 090010.jpg
http://www.ExceleratePerformance.com
2003 540i/6 #1090/1265 imported M5 diff+Sway, Powerflex bushings, BC Racing coils
1991 200 20v Avant MRC Tune + Bilsteins... more to come.
2001 330Ci Convertible -Fiance Mobile
2003 540i/6 #1090/1265 imported M5 diff+Sway, Powerflex bushings, BC Racing coils
1991 200 20v Avant MRC Tune + Bilsteins... more to come.
2001 330Ci Convertible -Fiance Mobile
- speeding-g60
- Posts: 2152
- Joined: Fri Mar 01, 2013 10:46 am
qezel wrote:a_CQ wrote:Sweet....question on exhaust mani...why not run 1+2 to front and 3+4 to rear....that way #4 would be shorter..
i don't know too much (next to nothing) about twin scrolls but going on pure speculation.. the idea is to have direct 1/4 into one scroll because they rise and fall together as well as 2/3 into one scroll because they also rise and fall together.. thus giving each scroll a constant and even pulse of exhaust gas pressure?
correct. you utilize paired cylinders together per volute.
out on the Interwebz wrote:[/quote]
A twin scroll turbine housing uses dual side by side passages into the housing. When coupled with a pulse converter manifold that separates exhaust pulses as many crank degrees in the firing order as possible, a twin scroll or divided housing works to reduce lag, decrease exhaust manifold backpressure on the top end, reduce the potential for reversion, and increase fuel economy. The twin scroll is based off the same reasoning a tri-Y header uses: keep spent exhaust gases out of an adjacent cylinder drawing in fresh air. At high rpm on a turbo car, exhaust backpressure is usually significantly higher than atmospheric pressure, and often higher than intake manifold pressure as well. A divider between each of the two volutes allows the cylinders to expel the exhaust gases without it interfering with the fresh air for combustion. Since there are two openings, each a smaller overall volume than a single scroll design, the exhaust velocity of each pulse can be maintained. This also spins the impeller more easily because lag is a function of the scroll area. A single turbine housing opening isn't as efficient since cylinders on the exhaust stroke of the 4 stroke cycle contaminate the cylinders that are on overlap with exhaust gas. A conventional turbine housing is not as effective in using exhaust pulse energy to help spin the turbine up to speed as it does not exploit the energy contained in the pulses as well.[/quote]





