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Topic: Turbo lag

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	Turbocharger - Wikipedia, the free encyclopedia
		Centrifugal superchargers operate in the same fashion as a turbo; however, the energy to spin the compressor is taken from the rotating output energy of the engine's crankshaft as opposed to exhaust gas.
		A lag is sometimes felt by the driver of a turbocharged vehicle as a delay between pushing on the accelerator pedal and feeling the turbo kick-in.
		Another common method of equalizing turbo lag is to have the turbine wheel "clipped", or to reduce the surface area of the turbine wheel's rotating blades.
	en.wikipedia.org /wiki/Turbo_lag (4741 words)

	SuperchargersOnline.com :: Turbo vs. Supercharger
		A turbo is instead driven by exhaust gasses that have been expelled by the engine and are travelling through the exhaust manifold.
		Turbos are complex and require manifold and exhaust modifications, intercoolers, extra oil lines, etc. - most of which is not needed with most superchargers.
		Turbos are known for their unique ability to spin to incredibly high rpms and make outrages peak boost figures (25psi+).
	www.superchargersonline.com /content.asp?ID=19 (1593 words)

	Turbo - WOI Encyclopedia Italia
		Compressed air from a turbo may be (and most commonly is, on petrol engines) cooled before it is fed into the cylinders, using an intercooler or a charge air cooler (a heat-exchange device).
		A turbo timer is a device designed to keep an automotive engine running for a pre-specified period of time, in order to execute this cool-down period automatically.
		Lag can be reduced by lowering the rotational inertia of the turbine, for example by using lighter parts to allow the spin-up to happen more quickly.
	www.wheelsofitaly.com /wiki/index.php/Turbo (2876 words)

	About Turbocharger at The Learning Center from TurbochargerPros.com
		Lag is also reduced by using a precision bearing rather than a fluid bearing, this reduces friction rather than rotational inertia but contributes to faster acceleration of the turbo's rotating assembly.
		The two smaller turbos produce the same (or more) aggregate amount of boost as a larger single turbo, but since they are smaller they reach their optimal rpm, and thus optimal boost delivery, faster.
		Its Turbo Jetfire was a 215 in³ (3.5 L) V8, while the Corvair engine was either a 145 in³ (2.3 L)(1962-63) or a 164 in³ (2.7 L) (1964-66) flat-6.
	www.turbochargerpros.com /about-turbocharger.html (3453 words)

	TurboByGarrett.com - FAQ's (Site not responding. Last check: 2007-09-17)
		Choosing between a single or parallel twin turbo setup is primarily based on packaging constraints in the engine bay, or a personal choice by the tuner.
		Turbo lag is the time delay of boost response after the throttle is opened when operating above the boost threshold engine speed.
		Turbo lag is determined by many factors, including turbo size relative to engine size, the state of tuning of the engine, the inertia of the turbo's rotating group, turbine efficiency, intake plumbing losses, exhaust backpressure, etc.
	www.turbobygarrett.com /turbobygarrett/tech_center/faqs.html (5119 words)

	Technical Mysteries Unraveled
		Turbo Lag was really the biggest problem preventing the early turbo cars from being accepted as practical.
		In the presence of turbo lag, it is very difficult to drive a car fluently.
		For a view on how difficult a Turbo car can be look at some reviews of early 911 turbos, which still have a reputation for wild behaviour when the boost arrives.
	www.ukcar.com /features/tech/Engine/turbo/forced_induction.htm (1145 words)

	CelicaTech - Lag caused by lightened flywheel?
		Turbo lag should decrease slightly with a lighter flywheel because the engine will be able to accelerate and move more exhaust flow more efficiently thus spooling the turbo quicker...
		Lag is cause by not having enough spent gasses to spin the turbine to create pressure.
		Now the lag of the turbo is X amount of time at WOT at X throttle and the rpms pick up faster with a lightweight flywheel so in effect you will get up higher in the rpm band before the turbo is at boost.
	www.celicatech.com /forums/showthread.php?t=79 (3889 words)

	Halfbakery: Steam Anti Turbo-Lag System
		Nice idea, but instead of using the steam to reduce turbo lag instead I am very sure u can produce a complete steamturbo system using the engine cooling water and extra heat by extracting the heat from the exhaust in the exhaust pipe as well.
		This would not only reduce lag to zero but be enough to drive the turbo on its own at low rpms.
		Turbo type oil pumped from a small sump would be far easier to control and move.
	www.halfbakery.com /idea/Steam_20Anti_20Turbo-Lag_20System (3848 words)

	AutoZine Technical School - Engine
		The turbos operate sequentially, that is, at low speed, all the limited amount of exhaust gas is directed to drive one of the small turbines, leaving another idle.
		It is primarily used to reduce turbo lag at low engine speed, but it is also used to introduce EGR (Exhaust Gas Recirulation) to reduce emission in diesel engines.
		Ordinary turbochargers cannot escape from turbo lag because at low engine rpm the exhaust gas flow is not strong enough to push the turbine quickly.
	www.autozine.org /technical_school/engine/tech_engine_3.htm (2542 words)

	[No title]
		When considering a turbo charger most folks tend to look at the maximum CFM rating of the compressor and ignore everything else under the assumption that the compressor and the exhaust turbine are perfectly matched out of the box.
		To minimize turbo lag, it is imperative that the turbine and the compressor are properly matched to the engine as well as the engine being properly matched to the transmission gears, the ring and pinion gears, and the tires.
		Turbo lag is often confused with the term boost threshold, but they are not the same thing, lag is nothing more the the delay from when the throttle is opened to the time noticeable boost is achieved.
	www.turbomustangs.com /turbotech/main.htm (15379 words)

	Turbo Anti-lag systems - A technical description
		As you might be aware of, turbochargers display what is known as lag time which is the time needed for the turbine to reach its full throttle from an intermediate rotational speed state.
		The duration of a turbocharger's lag depends on many factors among which its inertia, airflow efficiency, back pressure, etc. The problem is partly dealt with by fitting a turbo dump valve, which acts each time the driver lifts his foot from the throttle.
		Luckily the turbo sits right there and the explosion keeps it turning (otherwise it would slow down since its intake, the exhaust gases, is cut-off).
	www.rallycars.com /Cars/bangbang.html (898 words)

	Squires Turbo Systems - Turbo lag (Site not responding. Last check: 2007-09-17)
		Turbo Lag is a term used to describe the time that it takes from when you push the accelerator to full throttle to when the turbocharger comes onto boost.
		Turbos can be sized for specific applications to perform best at low, mid, or high rpm ranges.
		You can see by the chart that when the turbo is in the rpm range which it was designed to operate, that full boost can can be reached from a closed throttle to full boost in less than 1 second and in as little as 100 RPM's.
	www.ststurbo.com /turbolag (865 words)

	Big 16G Turbo Lag - DSMtalk Forums
		Only way to rid a little lag but also remember its not really lag on the AT beacuse you will be launching with about 8-12 psi, its more of a the tranny trying to put down the power with the stock converter.
		I would hazard a guess that since the Big 16G is a signigicantly larger turbo than the T-25, the exhaust gases at the same given rpm aren't able to spool the turbo as high as they could with the T-25.
		Turbo lag is really bothering me but after 3500rpm, the turbo feels better than the small T-25 at 20psi.
	www.dsmtalk.com /forums/showthread.php?t=266 (952 words)

	about turbo lag - SportsCarForums.com
		The smaller the turbo the less exhaust gas is needed to spool it..
		Which causes a forced missfire so the turbo stays spooled for a little bit longer to allow for braking into a corner without having to worry about re-spool when powering out of the corner or variable turbo's which divert exhaust gasses onto different areas of the impeller(fan blade) so the air is used more efficiently.
		While going w/ a sequential setup, or a smaller turbo needing less exhaust gas to spool up helps, the single best advance that engineers have made to reduce turbo-lag, is using light weight material to produce light weight turbines that need less accumulated gas pressure to begin spooling.
	www.sportscarforums.com /f13/about-turbo-lag-6277.html (1526 words)

	Turbochargers 101 (Site not responding. Last check: 2007-09-17)
		As has already been mentioned, a turbo is driven by the exhaust gasses which are already being expelled from the engine.
		Lag actually refers to how long it takes to spool the turbo when you're already at a sufficient engine speed to create boost.
		Turbos can be designed to minimize lag but this usually comes at the expense of top-end flow.
	www.xmission.com /~dempsey/shelby/turbo101.htm (2004 words)

	IGN: Turbochargers: Part 4 - Turbo Lag
		This power, though, is traded for an increase of the larger turbo in lag time for it to spool up and gain a useable amount of boost.
		If power is more important, such as on the racetrack, the turbos will be somewhat larger to allow for higher boost at rpm that are usually maintained throughout the race (unlike you sitting at the stoplight).
		Ok, so now we've got a turbo that is applicable to the type, as well as the projected use, of the vehicle in question.
	cars.ign.com /articles/457/457452p1.html (513 words)

	i-Club -- Forums - Turbo lag...reduction (Site not responding. Last check: 2007-09-17)
		Lag is the time it takes from when you hit the gas to the time you have full boost.
		With a small turbo for the low end and a bigger turbo for the high end.
		Granted sequential turbos are fairly tough to plumb as I understand it, but they would really give you the best of both worlds.
	www.i-club.com /forums/showthread.php?t=27005 (1289 words)

	Turbo Lag - GTIROC
		So its a choice really, Loadsa power, bigger turbo and a bit more lag or a smaller unit which will restrict your overall power but be less laggy and make low down responce alot better....
		Lag isnt that much of a problem when you learn to drive the car around it.
		most modern turbos (unless really huge) are so far removed from having any lag worth worrying about its no longer an issue, a t28 is not a modern turbo so compared to some medium sized bb turbos is laggy.
	www.gtiroc.com /forums/showthread.php?t=43906 (276 words)

	Aerotech Turbo Harley Davidson (Site not responding. Last check: 2007-09-17)
		However, just like watermills, (how many of those have you seen lately) turbochargers have several problems: The most noticeable is turbo lag, and it makes turbos all wrong for motorcycles.
		Aerocharger's patented process almost obliterates turbo lag -- making the motor think it is supercharged -- because they've come up with a way to keep exhaust gas velocity high at all engine speeds, by restricting the turbine inlet.
		The turbo sits below the rider's left foot, driven by modified exhaust pipes, and pushes air through a frame-mounted intercooler in the direction of the carburetor, a flatslide unit.
	www.motorcycle.com /mo/mcharley/aeroturbo.html (892 words)

	View topic - Turbo Lag and Turbo Size - Myths and Reality
		Larger turbo needs enough flow of exhaust gases to create enough back pressure in order to produce any boost, that's why larger turbos have lag.
		Because if you have 3 psi of back pressure after the turbo and you want 6 psi of boost then there will be 9 psi of back pressure between the turbo and the engine.
		Getting a signifigantly smaller turbo and pushing it harder will result in an overheated intake charge, so even though you might be making big boost numbers, it will not translate into power.
	forum.mazda6tech.com /about55.html (966 words)

	Turbo lag - 8th Generation Honda Civic Forum
		Turbo lag is an equation based on proper turbo sizing to th engine and mods that it has.
		There really is not much of a lag at all since one turbo comes online at low RPM, and the second comes alive at higher RPMs when the first begins to run out of steam.
		The turbo lag was relatively small and it kicked in rather smoothly unlike the 2006 mazda 3 series were the lag was also small but the kick in was abrupt.
	www.8thcivic.com /forums/showthread.php?t=19202 (867 words)

	Turbo Lag - LawnSite.com - Lawn Care & Landscaping Business Forum
		Well the turbo runs off spent exhaust gases so the engine has to be revving up to spin the turbo faster to make more power causing a little pause between the turbo to spin and getting it back into the intake manifold.
		The small turbo spools almost instantly, but goes out of its efficient range quickly, by the time you it does the large turbo is spooled.
		It's a centrifugal system in which the faster the turbo spools, the wider the vanes open and when the turbo is spooling slighty, it lets in enough exhaust to boost quickly without lag.
	www.lawnsite.com /showthread.php?t=125520 (1022 words)

	BMW Turbo Discussion - BMW 745i and BMW Turbo Project Forums - Turbo lag.. .... redefined....
		So what is turbo lag really as compared to the M6...
		In the 6 the torque curve is a 45º slope, in the 745 it is a near verticle slope, and IS verticle if the tranny is torQue stacked...
		With a turbo motor it is not necessary to shift at such a high RPM.
	bmwturbos.scottiesharpe.com /topic.asp?TOPIC_ID=902 (1032 words)

	LS1TECH - Turbo lag whats that lol (Site not responding. Last check: 2007-09-17)
		Lag is when i put it in 6th and oly get 1psi (crusing at 1600rpm)
		Reducing timing will reduce lag because the exhaust gasses are hotter when they leave the head.
		The T04E/T-50/T3HF turbo was a BIT laggy on a 2.0L, but the timing knocked off 1000RPM on spool.
	www.ls1tech.com /forums/showthread.php?t=39953 (1618 words)

	Howstuffworks "How Turbochargers Work"
		A turbo can significantly boost an engine's horsepower without significantly increasing its weight, which is the huge benefit that makes turbos so popular!
		Sometimes these changes may not be feasible -- a turbo can be a simpler, more compact way to add power, especially for an aftermarket accessory.
		If a turbocharger with too much boost is added to a fuel-injected car, the system may not provide enough fuel -- either the software programmed into the controller will not allow it, or the pump and injectors are not capable of supplying it.
	auto.howstuffworks.com /turbo3.htm (1072 words)

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