engineermike
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- #406
No, being 3” straight through I’m betting it hasn’t changed.Will you retest your exhaust back pressure test after installing the Jones mid-muffler ?
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No, being 3” straight through I’m betting it hasn’t changed.Will you retest your exhaust back pressure test after installing the Jones mid-muffler ?
It's one data point but the fastest and quickest person I'm aware of with ESS' smallest blower (G2 with 100mm pulley running 9.4x @ 149.xx) runs this resonator and has been doing so for over a year.Have you dyno tested or track tested the Jones muffler? I'm seriously thinking about sending mine back due to the crap internal construction and the wide open turbulence chamber. I don't think that spot weld will last over a year. I afraid it will start rattling and cause false knock
It's one data point but the fastest and quickest person I'm aware of with ESS' smallest blower (G2 with 100mm pulley running 9.4x @ 149.xx) runs this resonator and has been doing so for over a year.
@kevinvan6000
Bigger is better.28 pages in
Cliffnotes on the experiment??
That is a bit of a surprise. I suppose more tuning would get the 15 plus more. If back pressure was needed every race car would have some.Oddly, I learned on the dyno that you actually can go too low on backpressure. Once my entire system was full 3" straight through, adding cats back in actually gained about 15 hp, to everyone's surprise. It is possible that some more work with lambda and cal timing could get it back but still.
Good to hear. I think I'll install the one I have, I'm ready to quiet the car down some.tge jones is on my buddy’s car and it’s doing fine.
Keep in mind we have a ton of valve skirt area which allows a lot of low lift flow, and the tivct means we’re running a lot more overlap at wot than a typical street street or sc cam would. Then add boost to the equation. The stock exhaust imposed 10-15 psi backpressure so blowthrough would be reduced a lot. The Roush stock cal even accounts for charge blowthrough to correct the o2 sensor reading, so we know some bypassing is happening. My guess is that significantly reducing overlap up top is what it would need if your backpressure is Uber-low. However, every aftermarket tune I’ve laid eyes on runs the same overlap regardless of exhaust. Roush runs a lot more.That is a bit of a surprise. I suppose more tuning would get the 15 plus more. If back pressure was needed every race car would have some.
I think there is a reflected wave from your cats causing a bit of ram tuning from the exhaust. Just my EWAG (Educated Wild Ass Guess)
Just a thought, any possibility the catalytic monolith cores are contributing by creating a more laminar exhaust flow post catalytic vs systems with no catalytic.Keep in mind we have a ton of valve skirt area which allows a lot of low lift flow, and the tivct means we’re running a lot more overlap at wot than a typical street street or sc cam would. Then add boost to the equation. The stock exhaust imposed 10-15 psi backpressure so blowthrough would be reduced a lot. The Roush stock cal even accounts for charge blowthrough to correct the o2 sensor reading, so we know some bypassing is happening. My guess is that significantly reducing overlap up top is what it would need if your backpressure is Uber-low. However, every aftermarket tune I’ve laid eyes on runs the same overlap regardless of exhaust. Roush runs a lot more.