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s476r slow to spool or not.

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Old 04-18-2017, 07:43 PM   #21
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yes the piping is 2 1/4 single merge. the first few I built I used 2 1/2 pipe and they have been working great. my nova has a 2 1/2 and has gone 9.90 on 14 psi boost and seems to work well. the 2 1/4 is an effert to gain a little lowend spoolup. and as of yet I don't see any issue once in boost.

one of the hot sides I built is on my buddys Camaro with 2 1/2 to a single 2 1/2 looks exactly like the truck setup and has ran 9.40s on a 5.3 at 3550 raceweight with a on3 78/75 turbo @ 20 psi boost. I'm not seeing the big restriction at that power level yet. and i'll tell you the truck 2 1/4 setup pulls very good up stairs we have ran it to 7000 rpm on the ls2 370" engine and ljms stage 2 and it keeps pulling up there. thanks.
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Old 04-18-2017, 07:50 PM   #22
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here is the 2 1/2 one that runs 9.40s stock 05 5.3 with triple 12 cam and stock 706 heads on3 78/75 3200converter 400th and 3.73 gear. best 1/8 mile 6.05 @114 so far.
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Old 04-19-2017, 09:26 AM   #23
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The 5.3s with smaller turbos might manage to work.....does not mean it is right.

A 370 feeding a bigger turbine needs more volume to spin the turbine while the car is at the starting line......not a merge pipe the same size as the primaries. If you want 2.125" or 2.25" then they need to stay divided all the way to the turbine wheel.
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Old 04-19-2017, 09:33 AM   #24
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Iím not sure thatís a fact. Do you know the scroll exit diameter of a T4 1.25 housing? If itís collectively smaller than a 2.25Ē pipe than the pipe isnít a bottle neck. The 1.32 T6 is about 1.5Ē per scroll Iím told. Iím sure the T4 is significantly smaller, but I donít know exactly. Stuff some clay in that sucker and find out for us!

Also the smaller pipes increased velocity will have a greater impact spool speed than additional volume. Question is if the piping is small enough to be a choke point at his 370s current power level. Which I doubt.

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Old 04-19-2017, 10:21 AM   #25
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the 2.5 pipe is very close to the inside diameter of the t4 flange . meening if you hammer a round 2.5 pipe square it is not to far off of the t4 flange size. the 2.1/4 is a little bit smaller but still larger than if you look at the inside of the turbine housing it necks way down before getting to the wheel itself.

my idea with single 2 .5 or 2.25 pipe is to gain velocity entering the turbo. I have seen no evidence showing the pipe is to small. in a week or so we will do some track testing and I will let you know how it works. I know the 2.5 single pipe works great . thanks.
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Old 04-19-2017, 07:56 PM   #26
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In for data.

Good luck!!
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Old 04-20-2017, 04:06 PM   #27
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Interesting........
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Old 04-21-2017, 10:34 AM   #28
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I would be very interested if you changed that single 2.25" pipe, and reported back with results. That would solve the question of the pipe too small right there.
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Old 04-21-2017, 12:42 PM   #29
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we might but not until we get some solid track runs in to get a base et/mph with the 2 1/4 pipe.
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Old 04-21-2017, 01:29 PM   #30
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Quote:
Originally Posted by yenkomike View Post
we might but not until we get some solid track runs in to get a base et/mph with the 2 1/4 pipe.
Good move!!
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Old 04-21-2017, 01:50 PM   #31
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Have you done a back to back on something to show this? I asked about this a while back, and we met with a bunch on internet scientist saying that "it work work right" since its basically impossible to "pair" the cylinders "correctly".


But, in practice I cant see how it wouldn't be a benefit.
We back to backed a 2.5 merged to 3 with a fully divided 2.25 on a car that had datalogging capability.

the motor was 500 RPM quicker to get to 105 kpa, 5 psi , 10 psi.

The hotside was the only change.
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Old 04-21-2017, 03:27 PM   #32
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Quote:
Originally Posted by LilJohn View Post
We back to backed a 2.5 merged to 3 with a fully divided 2.25 on a car that had datalogging capability.

the motor was 500 RPM quicker to get to 105 kpa, 5 psi , 10 psi.

The hotside was the only change.
500rpm is huge.
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Old 04-21-2017, 05:50 PM   #33
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Quote:
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We back to backed a 2.5 merged to 3 with a fully divided 2.25 on a car that had datalogging capability.

the motor was 500 RPM quicker to get to 105 kpa, 5 psi , 10 psi.

The hotside was the only change.
Exactly what the ferk I was looking for.

Thank you sir! Not sure how hard that set up was pushed but did you see any differences up top?
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Old 04-21-2017, 06:44 PM   #34
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Quote:
Originally Posted by LilJohn View Post
We back to backed a 2.5 merged to 3 with a fully divided 2.25 on a car that had datalogging capability.

the motor was 500 RPM quicker to get to 105 kpa, 5 psi , 10 psi.

The hotside was the only change.
John, where do you put the waste gate on the 2 1/4" thats run all the way to the divided base ? Just 90* off the split, right at the turbo mount ?
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Old 04-21-2017, 07:59 PM   #35
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500 rpm is huge, something I may need to try that in the future. But for now I'm going to install my PTC and see what happens.

Quote:
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John, where do you put the waste gate on the 2 1/4" thats run all the way to the divided base ? Just 90* off the split, right at the turbo mount ?

Here is how mine is setup, single JGS 60mm works awesome.

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Old 04-22-2017, 10:05 AM   #36
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500 rpm is huge, something I may need to try that in the future. But for now I'm going to install my PTC and see what happens.




Here is how mine is setup, single JGS 60mm works awesome.

Oh ok. That looks like it would work really well. Im considering doing 2 1/4" all the way on mine as well. If I could come in 500 rpms early it should solve my converter/boost issue.
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