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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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07-19-2019, 01:01 AM | #15 | |
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07-19-2019, 05:01 AM | #16 |
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07-19-2019, 08:07 AM | #17 |
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Really interested to see a direct comparison like this on the NEW 4-2-1 Jdl offering.
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07-19-2019, 08:14 AM | #18 |
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10-17-2019, 05:48 PM | #19 |
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Bump to see if CSG has been able to get around to it yet!
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11-19-2019, 11:16 AM | #20 | |
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11-19-2019, 01:25 PM | #21 | |
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11-19-2019, 07:51 PM | #22 |
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Same dyno, not same day (weather is compensated for), and not same car.
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11-20-2019, 06:37 AM | #23 |
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11-20-2019, 07:59 AM | #24 |
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11-20-2019, 08:18 AM | #25 |
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If car & header is customer's, that paid for dyno time .. yes, it might be hard to convince him to pay double own money for header (that's not his) installment & dyno time. Customers may also dislike having their bought ware to first be installed on other car.
That aside, on same dyno imho it might be good enough for rough comparison imho |
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11-21-2019, 07:16 AM | #26 | |
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I think just a decent comparison of similar modded cars, tuned for the headers, would be a decent enough comparison in my mind. Not overlaying a jdl uel or el against the ace. The actual right 4-2-1 jdl header. |
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11-21-2019, 05:43 PM | #27 | |
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I think it is worth it to describe these headers better. The Ace is not a 4-2-1 header. As I said above, it is a 4-2 header, which works with their 2-1 overpipes, and that overpipe varies, such that the 150/250/350 progressively adds more length to the two pipes before they merge. The JDL header is maximizing the runner length as much as it can for the limits of a 4-2-1 header by merging to a single exit at the last possible inch. (Estimated from the pictures) The JDL header merges about 4-6 inches sooner than the Ace 150, which merges about 4-6 inches sooner than the 250, which merges about 4-6 inches sooner than the 350. Also, the Ace header has 4 pipes for three-quarters or more of its length, where the JDL has 4 pipes for about one-half its length. My guess is that we could plot the differences on a dyno between the 150/250/350 and extrapolate that the JDL would be equivalent to a 50 in the lineup, such that JDL50/Ace150/Ace250/Ace350 would follow like so. With that said, if your setup was ideal for the 150 over say the 350 then the JDL setup could also be ideal, but if the 350 was already better than the 150 than the 350 will be even that much more better than the JDL.
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11-21-2019, 06:01 PM | #28 |
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Extrapolating from this post:
http://www.ft86club.com/forums/showp...&postcount=185 It could be hypothesized that the JDL 4-2-1 header might offer slightly higher peak horsepower, while offering less torque. What would be nice would be a dyno overlay of the 150 vs 250 vs 350 to really see where the plots shift, and it wouldn't be a stretch to infer that the JDL header might shift the plot over just one more spot, likely towards the top of the rpm range and potentially at the detriment of low end torque--if I was speculating.
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