Finished Turbo crossover pipe - single or twin 44mm gates??
09-13-2007, 03:31 PM
#1
Finished Turbo crossover pipe - single or twin 44mm gates?? I just finished up my crossover tube for the turbo and need to locate the tial 44mm gates. I probably should have gone with a single 60mm but I've already got the twin 44s. Can a single 44mm control the boost?
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09-13-2007, 10:11 PM
#9
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Originally Posted by bc56f100
Depends on how low of boost you plan on running!! It should be fine!!
I would run both Phil. It can't hurt, and might help. The worst case scenario with going overkill on the wastegates is that your boost control is slightly more inaccurate. Meaning you'll have more minor fluctuations. On a datalog you might see a 1psi difference in mountainous boost levels (ie peaks at 10, then bumps to 10.5, then drops to 9.5, etc). Whereas if you were sized correctly, you may see only a .5psi difference (So hits 10, then hits 10.25, drops to 9.75, back to 10, etc). At any rate, not a big deal, not noticeable by the driver, and a good tune will handle it no problem.
Whereas if your WG is too small, your boost will start to rise with RPM, as exhaust flow overcomes that of the WG, and starts causing the turbo to overboost, possibly by over 5psi by the time redline rolls around, depending on how undersized you are. And while 1psi is no big deal, 5 can cause problems quickly.
09-13-2007, 10:23 PM
#10
Originally Posted by FieroZ34
Actually the amount of boost has no affect whatsoever on what size/quantity of wastegates he needs.
If your trying to run low boost under 10lbs with one small wastegate you might might have problems controlling boost.. It wont be as noticeable with higher boost.
If you have the space i would run the two. or a larger single.
very nice looking work btw
09-13-2007, 10:30 PM
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Originally Posted by lteone
huh...
If your trying to run low boost under 10lbs with one small wastegate you might might have problems controlling boost.. It wont be as noticeable with higher boost.
If you have the space i would run the two. or a larger single.
very nice looking work btw
If your trying to run low boost under 10lbs with one small wastegate you might might have problems controlling boost.. It wont be as noticeable with higher boost.
If you have the space i would run the two. or a larger single.
very nice looking work btw
09-13-2007, 10:53 PM
#12
but if your trying for lower boost, the wastegate has to flow more exhuast, bypassing the turbine housing, slowing down the turbo.. high boost means less flow thur the wastegate, so you can get away with using a smaller wastegate. (or single in this case)
09-14-2007, 09:50 AM
#16
Originally Posted by FieroZ34
The amount of boost has no affect on the sizing of the wastegates
If this guy wants to run 6psi he will not be able to it with lets say a 38mm gate. If he runs a 60mm gate then it will have no problem venting off enough exhaust (due to its size valve and venting off more flow per given amount of time) and allow the car to maintain a low boost setting.
You are right about the engine creating the exhaust flow, but the wategate has to evacuate it quick enough as not to have boost creep AND MAINTAIN THE DESIRED BOOST LEVEL.
If you want to hit a target PSI, wastegate sizing has everything to do with it.
I agree with overkill being better than undersizing.
09-14-2007, 09:59 AM
#17
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Correct me if im wrong but how ever you do it you want the bottom side of the gate to be pointed down the exhaust pipe towards the motor! That way the exhaust gases will be flowing straight into the gate which will put boost control at maximum efficiency! Going with two gates will never hurt because you dont have to use them to there full potential! They might only have to open a quarter of the way to keep the boost were you want it verses one gate having to open half way!!
09-14-2007, 10:05 AM
#18
Originally Posted by bc56f100
Correct me if im wrong but how ever you do it you want the bottom side of the gate to be pointed down the exhaust pipe towards the motor! That way the exhaust gases will be flowing straight into the gate which will put boost control at maximum efficiency!