535d drivers
02-16-2007, 04:41 AM
#51
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Originally Posted by BetterMakeWay' post='392180' date='Feb 16 2007, 08:23 AM
OK about the turbo lag debate: It is a rule than EVERY turboed engine suffers more or less from turbo lag. Petrol, diesel, sequential, parallel turbos it doesn't matter. Yes the sequential TT set-up on the 535d makes it almost turbo lag free, but ALMOST! If you do some test with the throttle response/engine (turbo) delivery you'll see that there is some turbo lag left. Even though it's true that the small turbo in the 535d is spooled up a bit even from idle, that doesn't mean it's spot on with the delivery at every throttle input. To be spot on, in theory it would have to be spooled up at maximum or very high speeds and that would be almost impossible in practice. It would probably need a bov just to blow into the atmosphere the extra boost not needed in some times.
In conclusion i'm sure that no turbo car (even the 997 turbo) has the response of a NA engine.
In conclusion i'm sure that no turbo car (even the 997 turbo) has the response of a NA engine.
Amen
02-16-2007, 05:07 AM
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Originally Posted by BetterMakeWay' post='392180' date='Feb 16 2007, 01:23 PM
OK about the turbo lag debate: It is a rule than EVERY turboed engine suffers more or less from turbo lag...To be spot on, in theory it would have to be spooled up at maximum or very high speeds and that would be almost impossible in practice. It would probably need a bov just to blow into the atmosphere the extra boost not needed in some times.
In conclusion i'm sure that no turbo car (even the 997 turbo) has the response of a NA engine.
In conclusion i'm sure that no turbo car (even the 997 turbo) has the response of a NA engine.
http://en.wikipedia.org/wiki/Turbocharger#Lag
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.
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.
Sometimes it's worth getting on with the practical experience rather than letting oneself be gnawed at by theory or by having a particular axe to grind. Live and let live.
ABC
02-16-2007, 05:42 AM
#53
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My Ride: E61 535d Apr 05. UK spec + Media Pack, Luxury Pack & Visibility Pack
Originally Posted by aybeesea' post='392192' date='Feb 16 2007, 02:07 PM
I usually avoid Wikipedia as possibly inaccurate and I await any corrections.
check this out. I don't particularly feel any turbo lag in my 535d either. Any hesitation is usually down to the blasted gearbox (from a standstill) or DSC.
To know the meaning of turbo lag, test drive an early Saab 900 (ca 1980 vintage), a BMW 2002 Turbo or a first generation Porsche 911 Turbo.
02-16-2007, 05:48 AM
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Originally Posted by dlevi67' post='392204' date='Feb 16 2007, 02:42 PM
I don't particularly feel any turbo lag in my 535d either. Any hesitation is usually down to the blasted gearbox (from a standstill) or DSC.
ABC
02-16-2007, 05:49 AM
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Originally Posted by dlevi67' post='392204' date='Feb 16 2007, 06:42 PM
check this out. I don't particularly feel any turbo lag in my 535d either. Any hesitation is usually down to the blasted gearbox (from a standstill) or DSC.
To know the meaning of turbo lag, test drive an early Saab 900 (ca 1980 vintage), a BMW 2002 Turbo or a first generation Porsche 911 Turbo.
PS: Or an evo fq 400. Top Gear proved the point of turbo lag
02-16-2007, 05:50 AM
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Originally Posted by aybeesea' post='392205' date='Feb 16 2007, 02:48 PM
Trying to keep the rubber on the ground can be errrr.... fun.
ABC
ABC
02-16-2007, 05:50 AM
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Originally Posted by BetterMakeWay' post='392206' date='Feb 16 2007, 02:49 PM
I still think that the turbo engine whatever they do it won't have the same response as a NA engine.
Theory and practice.
ABC
02-16-2007, 08:00 AM
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Originally Posted by aybeesea' post='392208' date='Feb 16 2007, 06:50 PM
And a nanometer is shorter than a micrometer but does it really matter?
Theory and practice.
ABC
Theory and practice.
ABC
But we were talking more theoretical weren't we?
02-16-2007, 08:41 AM
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