Begi-s boost creep issues
02-26-2008, 10:31 PM
#41
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you wouldn'd agree that free-er flowing exhaust allows the car to build more boost?
it allows the exhaust gases to exit more quickly out of both the wastegate AND the exhaust housing. but since they are not equally restrictive the whole path of less resistance comes into play. air will flow more through the turbo than through the wastegate since the wastegate passage is more restrictive therefor building more boost
the unrestricted exhaust further exaggerates the difference in how restrictive the waste gate and exhaust outlet are.
it allows the exhaust gases to exit more quickly out of both the wastegate AND the exhaust housing. but since they are not equally restrictive the whole path of less resistance comes into play. air will flow more through the turbo than through the wastegate since the wastegate passage is more restrictive therefor building more boost
the unrestricted exhaust further exaggerates the difference in how restrictive the waste gate and exhaust outlet are.
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02-27-2008, 03:50 PM
#44
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Porting the wastegate is not something we recommend you do at home. Not only does the casting get drilled out, Corky said there is a small hole drilled elsewhere.
We are more than happy to port a wastegate for anyone (regardless of who it was purchased from) at no charge. Just send us your turbo and we can send it back within a day or two. A pain to do, yes, but safer in the long run.
Stephanie
We are more than happy to port a wastegate for anyone (regardless of who it was purchased from) at no charge. Just send us your turbo and we can send it back within a day or two. A pain to do, yes, but safer in the long run.
Stephanie
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02-28-2008, 09:45 PM
#53
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Porting the wastegate is not something we recommend you do at home. Not only does the casting get drilled out, Corky said there is a small hole drilled elsewhere.
We are more than happy to port a wastegate for anyone (regardless of who it was purchased from) at no charge. Just send us your turbo and we can send it back within a day or two. A pain to do, yes, but safer in the long run.
Stephanie
We are more than happy to port a wastegate for anyone (regardless of who it was purchased from) at no charge. Just send us your turbo and we can send it back within a day or two. A pain to do, yes, but safer in the long run.
Stephanie
At what cost? my T3 doesn't see less than 13psi at redline with your manifold and DP and Jason's 3" catback.
I planned on doing it myself with a die-grinder, but i cant refuse this offer... I still need your water-bypass kit, so i might as well get it sent back with my order.
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02-29-2008, 05:50 PM
#56
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This does work but then there is a chance that when you do actually want to turn up the boost the flapper will blow open. This has been proven time and again with larger flappers on MHI turbos. But we're talking about 15+ psi and over 300hp so I'm not sure what bearing this has in this application.
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02-29-2008, 08:58 PM
#57
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Good point. As most of you probably know, force is surface area times pressure, and area goes up with the square of the radius. Doubling the diameter for example means quadrupling the area. I'm not saying of course that anyone would double the size of the wastegate, just using that for illustration. But the point is a small change in the wastegate diameter has a potentially strong effect on the force required to hold the valve closed, thus probably requiring a stronger spring in the wastegate actuator to compensate.
OK that is enough technobabble for a Friday night. Time for a beer.
OK that is enough technobabble for a Friday night. Time for a beer.
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03-01-2008, 12:43 PM
#58
Synasthetic,
You're on a turbo website. Guys building, installing, modifying there own stuff. Of course there are going to be issues. Take a Greddy kit and push it to 18psi and stuff will break.
The BEGI S system is basically brand new. BEGI saw the boost creep problem and are now taking steps to correct it - porting the WG.
There are hundreds of guys running FM, BEGI, custom and DIY kits for a long time without significant issues. There are lots of guys here that have great running systems with little or no issues. The thing with DIYers is lots of the problems wouldn't be significant if we weren't always looking for ways to get more power, more efficiency and push closer to the limits of the engine. You take a small 4 banger and double or triple the horsepower there are going to be occasional problems. Lots of people also can't pay for dyno time for proper tuning.
Check out the websites, if there are any, on the engine swaps. I'm sure everything isn't all rosy there either.
Enough trying to convince the Newb not to give up on turbos. Just ban him.
You're on a turbo website. Guys building, installing, modifying there own stuff. Of course there are going to be issues. Take a Greddy kit and push it to 18psi and stuff will break.
The BEGI S system is basically brand new. BEGI saw the boost creep problem and are now taking steps to correct it - porting the WG.
There are hundreds of guys running FM, BEGI, custom and DIY kits for a long time without significant issues. There are lots of guys here that have great running systems with little or no issues. The thing with DIYers is lots of the problems wouldn't be significant if we weren't always looking for ways to get more power, more efficiency and push closer to the limits of the engine. You take a small 4 banger and double or triple the horsepower there are going to be occasional problems. Lots of people also can't pay for dyno time for proper tuning.
Check out the websites, if there are any, on the engine swaps. I'm sure everything isn't all rosy there either.
Enough trying to convince the Newb not to give up on turbos. Just ban him.
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