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[quote][i]Algselt postitas: Maku[/i] Tõusin hommikul ülesse ja mõtlesin, et väljalaske vastusurvet ei ole ju mõõtnud. Seal ei tohiks midagi rasket olla. Võtan lambda pesast välja ja sinna keeran kuusepuuga poldi asemele, mille külge voolik rõhukellaga. Mõtlesin ka korra googeldada ja tulemus selline: Back-Pressure The first step before modifying an exhaust should be to measure the backpressure of the existing system. The higher the backpressure, the greater the restriction the exhaust is imposing on the engine. If the back-pressure is low, the gains that you can make in that area by fitting a new exhaust are also low. On the other hand, a high measured exhaust back-pressure shows that there’re lots of potential for gains in the exhaust area. Measuring exhaust back-pressure is easy.[b]The most convenient way to measure backpressure is to temporarily remove the oxygen sensor near the beginning of the exhaust system. The sensor can be unscrewed from the exhaust and left to dangle in the engine bay. Next you’ll need to find a bolt with the same thread as the oxygen sensor. Drill a small diameter hole through this bolt (from the head through the bottom) and weld a short length of metal pipe to the head. If you don’t have any welding equipment, any exhaust shop should be able to do this for you in a couple of minutes. An alternative is to find a plumbing fitting that will screw into the hole. The fitting needs to be in there for only a few minutes and doesn’t need to be more than finger-tight, so it doesn’t matter if the thread isn’t identical so long as it will easily screws in and stays in without leaking! Run a hose from the fitting to a pressure gauge located temporarily in the cabin. Any sort of pressure gauge that reads up to say 100 kPa or 15 psi is fine – it doesn’t even have to be an automotive gauge.[/b] [b]To read maximum back-pressure, it’s then just a case of selecting an appropriate gear and accelerating at full throttle to the redline.[/b] And, as we said, on the Falcon, that measured maximum was 8.7 psi. So how does that compare with other cars? The highest backpressure measurement we’ve seen came from a bog-stock Holden VL Turbo. Peak backpressure (measured immediately behind the turbine) was an astonishing 13.2 psi. A 1994 Subaru Impreza WRX (fitted with a more powerful Japanese-spec engine) saw up to 8.8 psi exhaust backpressure. Fitment of a high-flow exhaust then achieved a power increase of ten percent. The standard exhaust on a 2.4 litre Nissan Pintara caused a relatively low 5.9 psi backpressure – though this was measured after the cat converter, so it’s not representative of total exhaust backpressure. The total exhaust backpressure would likely have been about 7 – 7.5 psi. An SR20DET-powered Nissan 180SX with a standard exhaust had a measured peak back-pressure of 9.3 psi. [url=http://autospeed.com/cms/A_108185/article.html]Frank's Exhaust, Part 1[/url] Hydroscandis on kuusepuuga polte täitsa saadav, iseasi, kas ka nii suuri. Lambda mutter/polt peaks olema 18 eksole ja keere poolteist? Täisgaasil anyway lambdat ei kuulata, nii et kuusepuu külge ja proovima. Huviga ootan, mis tulemusi stock süsteem annab vs näiteks 3". Rain Aava ütles mulle kunagi nii (tsitaat ühest teemast): [quote][i]Algselt postitas: Maku[/i] Valjalaske vastusurve ei tohiks olla üle 1 bari.[/quote] [/quote]
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Eesti Audi Klubi foorum
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XMB Audi Club Edition
Täiendanud: indro, klem, j6mm & diversion @ 2002-2020
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