Pic request: "Y" pipe splitter mod
11-13-07, 11:15 AM
#1
Pic request: "Y" pipe splitter mod
the original thread is missing the photos. we're doing this to my Y pipe and i wanted some photos for reference.
did anyone happen to save the photos before they disappeared from the internet?
did anyone happen to save the photos before they disappeared from the internet?
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11-13-07, 06:00 PM
#8
bryant
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I haven't read the whole thread in awhile, but has anyone mentioned the fact that the butterfly valve in the rear y-pipe stays closed until switchover, therefore the boost of the 1st turbo isn't slamming over to the 2nd turbo causing alot of turbulance. It does fill up the small amount of space going to the butterfly valve, but then once it fills that up, its going up and through the IC, etc. Once the 2nd one comes on at 4500 and it opens up, I doubt if the boost of the 1st turbo is really making much of a difference to the boost that just got release into the system from the 2nd turbo. Since both are going to be around the same amount of boost, ones not going to be overpowering the other and shoving air past the oncomig air and hit the compressor wheels on either turbo. If installing the divider made a difference, maybe the boost drop at transition, when it always drops, would be lessened, but thats just a guess.
Tim
Tim
11-13-07, 08:56 PM
#9
When the y-pipe is divided, flow in each runner is reduced significantly as you lose the shared flow capacity of the plenum area. Additionally, maximum turbulence is moved to a point closer to the 90 deg bend at the top, which further reduces efficiency. There is a reason that the pipe was not designed with a divider from the factory. It must be understood that dividing the y-pipe is not the same as dividing the inlets to a turbine.
11-14-07, 03:32 PM
#11
The mods that I found do make a [modest] improvement cannot really be duplicated from pics, as it is the shape of the primary runner, not a divider.
11-19-07, 10:15 PM
#12
derrick at A.R.T. (seee my sig) ended up welding in a splitter. check out the pics.
i have an extra Y pipe, so i figured we would do the splitter mod. we're going to put both of them on the flow bench when we have some time. A.R.T. is getting a dyno in jan so we're going to test splitter vs. no splitter on the dyno also.
i have an extra Y pipe, so i figured we would do the splitter mod. we're going to put both of them on the flow bench when we have some time. A.R.T. is getting a dyno in jan so we're going to test splitter vs. no splitter on the dyno also.
06-20-12, 04:35 PM
#14
I have buy a used y pipe from japan and come to me with this mod.
I have it in my car over 2 years now, transition work great but I feel the second turbo loose power from 0.7 to 0.6 in load condition.
I have new 99 spec turbo and is in great shape the same for vacuum line and solenoids ,do you guys believe that maybe this mod create this problem?
I have it in my car over 2 years now, transition work great but I feel the second turbo loose power from 0.7 to 0.6 in load condition.
I have new 99 spec turbo and is in great shape the same for vacuum line and solenoids ,do you guys believe that maybe this mod create this problem?
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msilvia
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