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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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06-23-2020, 06:24 PM | #29 |
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The pipes I got were used. I'm the third owner of the header, and I was told it had a repair from a crack that occurred at one of the main flanges. These flanges are welded on the inside from the manufacture, and there are a few tack lines on the outside. The repair work looks good, but I plan to reinforce the area with more welds on the inside and out. The overpipe to frontpipe flange has welds on the inside and outside. The overpipe to header flange has welds on the inside, but is only seem tacked on the outside. I will likely add more welds to that end.
The header was also missing the plaque, which seems to have broke off. Because it is on the outside of the header and just tack welded in place, I am not surprised it broke off during heat cycles, as it probably was cooler than the pipe. There is no evidence that it was cut off or pried off, which would be hard to impossible to hide. I am a novice welder, but the welds looked good from the outside and could use improvement on the inside. I used a borescope to examine the welds on the inside and take a few pics. First, a good pic: This is from the overpipe. The weld had good penetration, and it looks like it was back purged, as the inside and outside look the same without any pores. In this picture we can see a solid weld at the pipe union. The line running down the pipe and the line in the right lower section are welding lines from making the pipe, where the manufacture of the pipe rolled sheet metal, welded the pipe then ground down the weld. The line mid right is the center of the merger section, which didn't have the best penetration. The rest of the picture are from the header. Here we see welds that penetrated through the metal around the O2 sensor bung, and we see another merger seem with no penetration. Here are a few more pictures of sharp edges. This doesn't mean the weld will fail, but if it did fail then the answer could partially or entirely be due to a partial thickness weld.
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06-23-2020, 06:50 PM | #30 | |
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I have never dyno'd my car, but I am in the process of updating my DT. Even if the header was the only change, I believe Bill versus Zach is doing my tune this time, and the tune likely includes general updates from product development over the last two years. I don't know if it is an apples to apples comparison. Also, I like your idea, but it would be hard to know where the power was added by datalogging the performance without going pretty crazy trying to account for all variables. The idea of this thread is to better understand and see where does the curves change for the 150, 250 and 350.
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06-23-2020, 07:17 PM | #31 |
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@Irace86.2.0
I’m a semi wannabe professional weld critic. Those welds look great. You have JDL 4-2-1 now and switching to ace 150? Could do the test but noting times at 500rpm intervals possibly one is noticeably faster at 4200-5700 and the other 5700-7200 even if both have similar 4200-7200 times. I would suspect the JDL 4-2-1 would be quicker early and 150 quicker later. Not 150/250/350 specific but still could be good data if something substantial comes from it. |
06-23-2020, 09:48 PM | #32 | |
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I have the OEM headers now. I’ll consider doing a datalog.
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08-20-2020, 08:43 PM | #33 | |
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So Question I have a Vortech Supercharger (centrifugal) and I currently have the Borla UEL headers I am looking for a new header to maximize the top end power of my Supercharger I was looking at the JDL 4-2-1 but now I think the ACE 150 may be better. Any Advice? Attached is my dyno chart (363/273). I don't really want more Torque because I know that may break something in my engine. Thanks in advance. |
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08-20-2020, 08:53 PM | #34 | |
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08-20-2020, 08:57 PM | #35 | |
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So from this one post it made me think the 150 would be better for the top end. |
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08-20-2020, 09:56 PM | #36 |
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I don't follow. The 150 is meant for high revving, where the engine makes the most power, but the 350 makes more power up top? Or do you mean the 350 makes more area under the curve?
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08-20-2020, 10:20 PM | #37 | |
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08-20-2020, 10:25 PM | #38 | |
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The stock engine starts to choke around 7000 rpm; FI, particularly centrifugal with rising boost, masks that. |
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