Wastegate Porting
05-20-2005, 01:13 AM
#1
Senior Member
Thread Starter
Join Date: May 2004
Location: Coon Rapids, MN
Posts: 310
OK I have been searching around and cant seem to find a definitve answer to this, maybe because not alot of people have done it.
I have stock S5 turbo which is creeping to 20 psi in 3rd gear, maybe even more, I dont want to venture further to find out.
My question is that who out there has ported there wastegate and has it worked? Were you hitting approx your desired boost pressures? Did you have to do any custom work to the turbo?
It was pointed out to me that porting the wastegate alone would not get me to the the desired PSI levels I am shooting for, 12-14psi. They said that the w/g would have to be vented to the atmosphere through custom work to the turbo......
Some other info about the setup:
Intake, full 3 inch exhaust, stock S5 turbo, Haltech E6X
Any help here would be great because I cannot afford to upgrade to a big single right now so I want to be able to run the stock turbo at low enough boost to where it wont start wearing out to quickly.
I have stock S5 turbo which is creeping to 20 psi in 3rd gear, maybe even more, I dont want to venture further to find out.
My question is that who out there has ported there wastegate and has it worked? Were you hitting approx your desired boost pressures? Did you have to do any custom work to the turbo?
It was pointed out to me that porting the wastegate alone would not get me to the the desired PSI levels I am shooting for, 12-14psi. They said that the w/g would have to be vented to the atmosphere through custom work to the turbo......
Some other info about the setup:
Intake, full 3 inch exhaust, stock S5 turbo, Haltech E6X
Any help here would be great because I cannot afford to upgrade to a big single right now so I want to be able to run the stock turbo at low enough boost to where it wont start wearing out to quickly.
05-20-2005, 08:33 PM
#3
Senior Member
Join Date: Oct 2001
Location: Peoria, AZ
Posts: 10,906
He doesn't have a boost controller, and his w/g connections are solid. I am going to test the wastegate if and when I get the turbo back in the shop.
For now I just ported the wastegate runners and the angle at which the exhaust enters the w/g runner. I also milled out the backplate and the top of the door to allow further travel of the door. I'm curious to see how well it works out.
If it doesn't I am going to make a seperate dump tube for the w/g that vents to the atmosphere.
For now I just ported the wastegate runners and the angle at which the exhaust enters the w/g runner. I also milled out the backplate and the top of the door to allow further travel of the door. I'm curious to see how well it works out.
If it doesn't I am going to make a seperate dump tube for the w/g that vents to the atmosphere.
05-21-2005, 08:28 PM
#4
Senior Member
Join Date: May 2002
Location: California
Posts: 22,465
either somethings not flowing or our turbos are bad, but with an s5 turbo and a full open exhaust i'm having trouble getting MORE than 10-12psi. mine was running .5bar and once i put the cat in boost is spiking to .8-.9 in the upper gears.
mines a stock s4 with an intake, fcon, s5 turbo and rb exhaust
the other car is an s5 t2 with an e6k and 3" exhaust
both cars are running stock unported wastegates
mines a stock s4 with an intake, fcon, s5 turbo and rb exhaust
the other car is an s5 t2 with an e6k and 3" exhaust
both cars are running stock unported wastegates
05-21-2005, 08:32 PM
#5
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Join Date: Jan 2002
Location: San Jose, CA
Posts: 1,145
I ran the same setup on my car for nearly 3 years. I had to beg, plead, and practically make a deal with the devil to get the turbo to hold 14psi of boost.
There is something else amiss with your setup.
There is something else amiss with your setup.
05-22-2005, 03:01 PM
#6
Senior Member
Thread Starter
Join Date: May 2004
Location: Coon Rapids, MN
Posts: 310
Your having trouble MAKING boost that high with wide open exhaust liek that?? That is very strange. A friend of mine was running almost the same setup on his s5 t2 except he had 2.5 inch dp/mp, but he was still making 17-18 psi under high loads.
Anyways, ran the car and the porting definetly worked. Under high loads like 4th gear I am making 10-12 psi right now, So hopefully with a boost controller I will be able to turn that up just a bit.
Anyways, ran the car and the porting definetly worked. Under high loads like 4th gear I am making 10-12 psi right now, So hopefully with a boost controller I will be able to turn that up just a bit.
05-22-2005, 08:20 PM
#7
Senior Member
Join Date: May 2002
Location: California
Posts: 22,465
[quote name='spooliNrx7' date='May 22 2005, 12:01 PM']Your having trouble MAKING boost that high with wide open exhaust liek that?? That is very strange. A friend of mine was running almost the same setup on his s5 t2 except he had 2.5 inch dp/mp, but he was still making 17-18 psi under high loads.
Anyways, ran the car and the porting definetly worked. Under high loads like 4th gear I am making 10-12 psi right now, So hopefully with a boost controller I will be able to turn that up just a bit.
[/quote]
you're missing the point. the lower the flow, the higher the boost. the more free flowing my exhaust is the lower my boost is. if YOU are hitting 18psi, something is not flowing as it should
Anyways, ran the car and the porting definetly worked. Under high loads like 4th gear I am making 10-12 psi right now, So hopefully with a boost controller I will be able to turn that up just a bit.
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you're missing the point. the lower the flow, the higher the boost. the more free flowing my exhaust is the lower my boost is. if YOU are hitting 18psi, something is not flowing as it should
05-24-2005, 01:15 PM
#9
Senior Member
Join Date: Dec 2003
Location: Minneapolis,MN
Posts: 500
I have a stock s5 turbo and a EBC and have no problems dialing in the exact boost I want. No spikes or problems.
I set it at 8lbs and it will hold all the way to redline.
I set it at 15lbs and it holds all the way to redline.
I set it at 8lbs and it will hold all the way to redline.
I set it at 15lbs and it holds all the way to redline.
05-24-2005, 09:40 PM
#10
Senior Member
Join Date: May 2002
Location: California
Posts: 22,465
[quote name='1Revvin7' date='May 22 2005, 09:43 PM']He has a 3" thunderfabrications downpipe/midpipe with the Apex N1 exhaust...
I have seen more than a handful of stock turbo FC3S with full 3" exhaust hit over 17psi....
Anyhow I'm suprised it work.
[/quote]
n1 single? thats the problem right there.
I have seen more than a handful of stock turbo FC3S with full 3" exhaust hit over 17psi....
Anyhow I'm suprised it work.
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n1 single? thats the problem right there.