Jim Strickland wrote: >>Ok, my bad. Angular velocity, not velocity of car. >> >> > >I usually use RPM because there is a gauge on my dash that tells me what >the RPM is. I do not have an angular velocitometer. > Angular velocity is the correct term for "rotational speed" and _you_ measure it in rotations per minute. Usually it's in degrees/second or radians per second. Comes to the same thing though. Power is directly proportinal to the torque produced multiplied by the speed you can spin it.... Getting really basic here.... >Exactly not! With horsepower does not necessarily come torque, >especially on high revving Hondas! I don't get your point, anyways. > You're thinking of bottom-end torque - ie what you get from an american engine or in my case a Diesel (I drive a modern direct injected turbo-diesel - 2 litres and 250Nm of torque at 3000rpm). Torque is produced higher up in the rev range which results in lots of power..... You yourself already stated torque and power are directly proportional.... > >I would not say this. Choosing a correct turbo for an engine is very >important. It can easily be too small or too large for an application. >Every turbo has an efficiency map. When making a turbo system, the user >must choose the best turbo for the application. This is done using an >efficiency graph with the axes "pressure ratio" and "air flow". The >pressure ratio is based on the turbo pressure, the air flow is based on >the size of the engine and RPM. Too much or too little pressure for the >type of engine and turbocharger will make the turbo run non-efficiently. > And you must also choose to mount the turbo to the end of a tuned pipe with headers or to a manifold, putting it as close as possible to the exhaust ports on the cylinder heads, deliberately creating turbulence in the exhaust to increase the pressure available to spin the turbo. Over-spinning is always a risk, so in practical terms the wastegate is required to protect the turbo and engine, but in theory, the turbo will try to keep boosting to higher and higher flows. > > >> >> >No. I was talking about the sensor that senses turbo pressure and >controls the gain and psi of the turbo. Say you want to run 5 psi to the >engine, and you set the electronic control for the wastegate at 5psi >(assuming you have an electronic wastegate). > Electronic wastegate.... OK now I *think* I understand how these things go. You're talking the difference between an HKS boost controller and my friend's £10 bleed-off valve mounted in his centre console http://www.skylinegts.co.uk/images/Owners_cars/Sisky-int.jpg It's to the left of his cigarette lighter. (yes I know the car's old, but considering what Nissan were doing in 1985 just goes to show how out of date the DeLorean is- it's a phenominal car to drive). All this valve does is deliberately bleed air off from the wategate upping the boost pressure. It's a simple way of doing what the "electronic" controllers achieve for £xxx more. It only works because the RB20DET uses mass air flow metering. Martin [Non-text portions of this message have been removed] Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=244522.3707890.4968055.1261774/D=egroupweb/S=170512 6215:HM/A=1595054/R=0/SIG=124ukap9t/*http://ashnin.com/clk/muryutaitakenat togyo?YH=3707890&yhad=1595054> Click Here! <http://us.adserver.yahoo.com/l?M=244522.3707890.4968055.1261774/D=egroupm ail/S=:HM/A=1595054/rand=497965169> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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