turbo lag
More Turbo
Joined: Jan 2005
Posts: 568
Likes: 38
From: Henniker
In order for the turbo to kick in it needs plenty of exhaust pressure, wich you have to get the engine spinning to get the exhaust pressure. It also has to do with emissions, Your engine wont give it a ton of fuel until there is plenty of boost. This is done to prevent black smoke. So you need the engine to rev up to get the boost but you need the boost to give the engine full fuel.
Elder User
Joined: Nov 2003
Posts: 987
Likes: 3
From: Bass Lake, CA
what you are descrtibing is NOT TURBO LAG....
I usually refrain, as this comes up a million times on this site, and is always wrong.
what the deal is, the rpm of the engine is below the boost threshold of the turbocharger.
turbo lag, and the amount of time it takes the turbo to produce positive pressure in the intake tract AFTER BOOST THRESHOLD has been reached, not from the time you mash the pedal. it would have the SAME EXACT delay if no turbocharger was present.
as for lag, the 6ohh has NONE.
sorry for the rant.....but your not feeling lag.
here is an excerpt that defined it better than me
Lag is not to be confused with the boost threshold, however many publications still make this basic mistake. The boost threshold of a turbo system describes the minimum turbo rpm at which the turbo is physically able to supply the requested boost level. Newer turbocharger and engine developments have caused boost thresholds to steadily decline to where day-to-day use feels perfectly natural. Putting your foot down at 1200 engine rpm and having no boost until 2000 engine rpm is an example of boost threshold and not lag.
http://www.answers.com/topic/turbocharger
I usually refrain, as this comes up a million times on this site, and is always wrong.
what the deal is, the rpm of the engine is below the boost threshold of the turbocharger.
turbo lag, and the amount of time it takes the turbo to produce positive pressure in the intake tract AFTER BOOST THRESHOLD has been reached, not from the time you mash the pedal. it would have the SAME EXACT delay if no turbocharger was present.
as for lag, the 6ohh has NONE.
sorry for the rant.....but your not feeling lag.
here is an excerpt that defined it better than me
Lag is not to be confused with the boost threshold, however many publications still make this basic mistake. The boost threshold of a turbo system describes the minimum turbo rpm at which the turbo is physically able to supply the requested boost level. Newer turbocharger and engine developments have caused boost thresholds to steadily decline to where day-to-day use feels perfectly natural. Putting your foot down at 1200 engine rpm and having no boost until 2000 engine rpm is an example of boost threshold and not lag.
http://www.answers.com/topic/turbocharger
Senior User
Joined: Jul 2004
Posts: 375
Likes: 0
From: W. Philly Burbs
Yes, but one interesting thing is from what ive seen and been told the turbo lag can effectivelly be dialed out of the 6.0 with some creative tuning of the VGT........the turbo threshold is actually attained at a low RPM but the VGT doesnt take advantage of it untill higher up in the RPMs.
If ford would only look into these things more and do it in a off the showroom manner
If ford would only look into these things more and do it in a off the showroom manner
Last edited by King of the Road 04; Dec 31, 2005 at 05:47 PM.
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From: Arizona
Originally Posted by PAID BY FORD
I powerbrake it at lights and launch it when green its a blast!!!
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