996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

Overboost, do I have a wastegate issue (GT3582)

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Old Oct 4, 2015 | 01:30 PM
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Originally Posted by m_motorsport
When i had my EBC i ran 1/8npt to 5mm hose connectors, then ran these direct to the bottom of the wastegates, then ran the top port of the wastegates to my EBC. I now have this closed as i am running a hallman pro MBC so just have the lower port connected to this and top port to air. I think the less distance involved the better to be honest and it seams neater using the compressor housing. I was at TV3 a week ago and was hitting 207mph on their 1.3 mile runway, but hoping to get to 210-215 next events after a few more cooling mods, will be up for vmax for sure so count me in
Ahhh your the fast Porsche ive heard about !!!! What turbos are you running? Heres a link to the event, should be good with 40+ 911's

http://www.911uk.com/viewtopic.php?t=106676
 
Old Oct 4, 2015 | 01:42 PM
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Originally Posted by johnny.dangerous
Ahhh your the fast Porsche ive heard about !!!! What turbos are you running? Heres a link to the event, should be good with 40+ 911's

http://www.911uk.com/viewtopic.php?t=106676
Im running 3076r with external gates. Awsum, yeah i was at woodbridge last weekend managed to get about 15 runs all between 205-207 and the runway is fantastic, so much better than bruntingthorpe. Would love to attend, would be a great event. Will post up on there shortly.
 
Old Oct 4, 2015 | 01:49 PM
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Originally Posted by m_motorsport
Im running 3076r with external gates. Awsum, yeah i was at woodbridge last weekend managed to get about 15 runs all between 205-207 and the runway is fantastic, so much better than bruntingthorpe. Would love to attend, would be a great event. Will post up on there shortly.
Im only in Gatwick if you ever fancy a meet up or chat!!
 
Old Oct 4, 2015 | 02:04 PM
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Originally Posted by johnny.dangerous
Im only in Gatwick if you ever fancy a meet up or chat!!
Yes mate im up for that, i actually live in Ipswich but i down in london quite often so would be good to meet up, if you are ever up this way let me know, there is some good 1-2 mile unused roads
 
Old Oct 5, 2015 | 09:52 AM
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I don't think it will fix your issue. Stupid question- when did all this start to happen. Secondly , why aren't the headers built to clear a 35r?
Hers mine and never had any issues with boost creep.
Both ports are connected. Side goes to compressor housing and the center to the ebc.
 
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Old Oct 5, 2015 | 10:43 AM
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It looks to me that one side clears (driver side here in the US) and the other side does not. Maybe the way the comp housing needs to be clocked and that style of collector on his header causes this. I would just shorten the wastegate runner and angle it out of the way of the housing. Btw - NICE headers Markski!
 
Old Oct 5, 2015 | 10:44 AM
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Originally Posted by MARKSKI@911tuning
I don't think it will fix your issue. Stupid question- when did all this start to happen. Secondly , why aren't the headers built to clear a 35r?
Hers mine and never had any issues with boost creep.
Both ports are connected. Side goes to compressor housing and the center to the ebc.
Its first time Ive run it Mark, I would imagine that the headers were primarily designed for a smaller T3 turbo like a 3076, for the money I paid trust me I can put up with a few teething troubles, Ive bought 2 fittings to go direct from comp housing to side port and then hopefully we can raise boost from 0.8 bar.
 
Old Oct 5, 2015 | 12:12 PM
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Originally Posted by 03EvoIII
It looks to me that one side clears (driver side here in the US) and the other side does not. Maybe the way the comp housing needs to be clocked and that style of collector on his header causes this. I would just shorten the wastegate runner and angle it out of the way of the housing. Btw - NICE headers Markski!
If the dry sump tank was not in the way I could have just kicked the WG mount, im also paranoid about the WG hanging down as in the UK we have 1000's of the devils own work.............................speed humps !!!!
 
Old Oct 5, 2015 | 02:48 PM
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The merge angle could be an issue, but i would only jump to that conclusion after you get the wastegate lines right.

Mine has a short line from the compressor to the lower wastegate port. Boost control is rock solid





 
Old Oct 5, 2015 | 03:49 PM
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^^^That's what mine look like. I like your WG dumps though...Mine are just dumping straight out from the gate.
 
Old Oct 5, 2015 | 07:50 PM
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as much as it pains me to agree with markski i have to! i think the headers are the issue. rework them to fit the turbos not try to fit the turbos to the headers
 
Old Oct 7, 2015 | 11:14 AM
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Originally Posted by 32krazy!
as much as it pains me to agree with markski i have to! i think the headers are the issue. rework them to fit the turbos not try to fit the turbos to the headers
After putting a boost ref to the lower port all seems fine, they hold 0.9 bar and only saw 1 bar for a split second , this is taking the ref from the intake near the TB so I think when I plumb them into the comp housing it will hold at 0.8/9 bar which is perfect as I can increase from there, im fitting the vac ports to the comp housings tonight so will plumb the N75 back in and see if we can run 1.2 bar
 
Old Oct 7, 2015 | 12:25 PM
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NICE man! Glad to hear it was an easy fix!! Yea you should get quicker response on the reference port taking it directly from the comp housing. That's what I do. I come off the comp housing directly to the side port of the WG and I have a T-fitting in that line that goes up to the MAC valve.
 
Old Oct 7, 2015 | 12:36 PM
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Originally Posted by 03EvoIII
NICE man! Glad to hear it was an easy fix!! Yea you should get quicker response on the reference port taking it directly from the comp housing. That's what I do. I come off the comp housing directly to the side port of the WG and I have a T-fitting in that line that goes up to the MAC valve.
Thanks dude, I have no idea why my mapper said top port only !!! Ive always plumbed the bottom ports as well! Oh well its done now and hopefully no boost creep. Just got to build the spare motor and box now to use the turbos properly
 
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