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02-25-2008, 11:46 PM | #11 |
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I was about to post this heh. This is currently the fastest setup available for the N54, based on 1/4th mile times, posting 11.89 with DRs, on the tuner's car. I'd definitely put my money on this setup over the V2 ATM, but the guy who did this video is going to do some pulls with a TBE V2 car soon to see the result.
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02-26-2008, 12:22 AM | #12 |
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Please forgive what I'm about to ask As I don't have a clue!!
What the hell was he talking bout?? Down pipes & something about pills?? would someone please be kind enough to relay what he said in "big dummy terms" I think that was awesome tho!!
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02-26-2008, 12:50 AM | #13 | |
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After the exhaust gas flows through the exhaust turbine, it exits the turbocharger into the "downpipe", this pipe carries the exhaust out of the engine comparment down to the rest of the exhaust. Catalytic converters are typically integrated into the downpipe. By replaces the down pipe with a unit that allows for more flow, and removes obstructions like cats, one can promoted faster, more efficient exhaust gas flow. This is particularly important in turbocharged cars, since the engines are always working under high pressure. By reducing exhaust back pressure, exhaust gas can be more efficently evacuated from the engine. This allows for several things. It allows the air from the intake to flow into the engine faster, increasing the amount of air that can enter the engine, allowing for more power. It also results in gas passing over the exhaust turbine side of the turbo faster Since it's moving faster, it transfers more kinetic energy, causing the turbo to "spool up" faster. I hope that made sense. As for "pills" he's talking about a "Hot Pill"(H-Pill), which is something that only the Juice Box uses. Since boost in our car is controlled by a computer, changing the eletric signal entering that computer can increase the amount of boost that the turbo developes. The H-Pill is a resistor that alters the electrical signal slightly, causing a slight increase in boost pressure.
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02-26-2008, 04:00 AM | #14 | |
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02-26-2008, 07:08 AM | #16 |
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There's another little detail that most folks haven't mentioned in awhile and Chuck was good enough to allude to it. Firing order, and the subsequent exhaust pulses in a straight six, make the use of two small turbos, rather than one large one, pretty dam effecient. Thanks to the firing order, each three cylinder bank has 120 degrees of crankshaft rotation (think of it as time) before the next exhaust pulse hits the turbo. It allows for the exhaust wave to exit the turbine and downpipe with decent separation between it and the subsequent pulses. It actually creates a bit of vacumm behind it and that assists in extracting the next pulse, und so weiter . . .
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02-26-2008, 07:44 AM | #17 |
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:eyebulge:What a pull. That from just an OTS tune and race gas with just a DP? Not full TBE?! No fueling mods required?!
Holy cow.
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02-26-2008, 09:28 AM | #18 | |
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This is a different car BTW.:wink: |
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02-26-2008, 09:29 AM | #19 |
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02-26-2008, 10:25 AM | #20 | |
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02-26-2008, 11:20 AM | #21 |
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[quote=E82TT6;70711
By replaces the down pipe with a unit that allows for more flow, and removes obstructions like cats, one can promoted faster, more efficient exhaust gas flow. [/quote] Thanks for the informative post! Forgive my complete ignorance, but I assume that since the downpipe bypasses cats, it would probably fail emissions inspection? |
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02-26-2008, 11:50 AM | #22 |
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Hmmm - I believe there are two sets of cats on this engine, light-offs and then primaries - the light-off cats are snugged up under the turbines. You may be able to remove them and pass emissions [spoken with the same voice as Abe Vigoda in the Godfather saying, "You may be able to tape the gun . . ." ; -].
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