Motorway driving
30 March 2005 | 02:56 PM
#1
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Motorway driving
MY97UK Turbo, pretty standard bar exhaust, filter, BOV.
Question is: In 5th, what speed/RPM does the turbo kick in? I do a lot of m-way driving & find that doing 80 at 3100 increases fuel consumption A LOT more than doing 70 at 2800.
Question is: In 5th, what speed/RPM does the turbo kick in? I do a lot of m-way driving & find that doing 80 at 3100 increases fuel consumption A LOT more than doing 70 at 2800.
30 March 2005 | 04:50 PM
#4
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From: A long way from Tipperary
Originally Posted by Tak
Just wondered if any1 could be more precise cos on a 200 mile trip i can save about £15 of fuel if i dont use the turbo
30 March 2005 | 05:37 PM
#5
Originally Posted by Tak
Just wondered if any1 could be more precise cos on a 200 mile trip i can save about £15 of fuel if i dont use the turbo
If by the end you feel you want to save another £15 for the return trip, trade your scooby in for a Diesel...
Been driving my brothers A4 2.5tdi for the last week, and have saved so much...
30 March 2005 | 09:02 PM
#7
Originally Posted by SamUK
200 mile trip will cost 3/4 of a tank...just keep your foot light and hold at 70..though can be very boring...
If by the end you feel you want to save another £15 for the return trip, trade your scooby in for a Diesel...
Been driving my brothers A4 2.5tdi for the last week, and have saved so much...
If by the end you feel you want to save another £15 for the return trip, trade your scooby in for a Diesel...
Been driving my brothers A4 2.5tdi for the last week, and have saved so much...
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30 March 2005 | 09:05 PM
#8
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Joined: Aug 2003
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From: Sheffield; Rome of the North
SWINDON ? I assume that you get excellent MPG driving there but about 12 miles to the gallon as you try to get away from the God awful place.....?
Nuclear bomb dropped on Swindon; how much damage? £15!
/David Brent
Nuclear bomb dropped on Swindon; how much damage? £15!
/David Brent
30 March 2005 | 09:12 PM
#9
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From: Ascended to the next level
70 to 80mph is right where the turbo wants to play.
The result is a very tiny movement on the throttle sends you from vacuum or 0bar right up to 0.5+bar and conseqently a big increase in fuel consumption.
The trick is to find the throttle postion to keep you at 80mph on the flat and DON'T MOVE YOUR FOOT! Seriously, as the tiniest increase at the speed create a disproprtionate increase in boost and fuel consumption.
I find the cause (on classics) maybe partly due to the gearing on the throttle and linkage. The scooby seems to have a directly proportionate throttle linkage. - i.e 1/2 on the pedal = 1/2 opening at the buttlerfly. Many other cars I have looked at don't work like this...they only get 1/2 opening at the butterfly at 3/4 at the pedal (if that makes sense
) so the first 3/4 movement of the pedal only moves the throttle a very small amount, where the last 1/4 of the pedal move the throttle alot.
The other cause is the turbo being so sensitive to spooling up at that speed, would be great if you could just switch it off
The result is a very tiny movement on the throttle sends you from vacuum or 0bar right up to 0.5+bar and conseqently a big increase in fuel consumption.
The trick is to find the throttle postion to keep you at 80mph on the flat and DON'T MOVE YOUR FOOT! Seriously, as the tiniest increase at the speed create a disproprtionate increase in boost and fuel consumption.
I find the cause (on classics) maybe partly due to the gearing on the throttle and linkage. The scooby seems to have a directly proportionate throttle linkage. - i.e 1/2 on the pedal = 1/2 opening at the buttlerfly. Many other cars I have looked at don't work like this...they only get 1/2 opening at the butterfly at 3/4 at the pedal (if that makes sense
) so the first 3/4 movement of the pedal only moves the throttle a very small amount, where the last 1/4 of the pedal move the throttle alot.The other cause is the turbo being so sensitive to spooling up at that speed, would be great if you could just switch it off
31 March 2005 | 10:10 AM
#12
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From: house in a street on the earth
Originally Posted by Shark Man
70 to 80mph is right where the turbo wants to play.
The result is a very tiny movement on the throttle sends you from vacuum or 0bar right up to 0.5+bar and conseqently a big increase in fuel consumption.
The trick is to find the throttle postion to keep you at 80mph on the flat and DON'T MOVE YOUR FOOT! Seriously, as the tiniest increase at the speed create a disproprtionate increase in boost and fuel consumption.
I find the cause (on classics) maybe partly due to the gearing on the throttle and linkage. The scooby seems to have a directly proportionate throttle linkage. - i.e 1/2 on the pedal = 1/2 opening at the buttlerfly. Many other cars I have looked at don't work like this...they only get 1/2 opening at the butterfly at 3/4 at the pedal (if that makes sense ) so the first 3/4 movement of the pedal only moves the throttle a very small amount, where the last 1/4 of the pedal move the throttle alot.
The other cause is the turbo being so sensitive to spooling up at that speed, would be great if you could just switch it off
The result is a very tiny movement on the throttle sends you from vacuum or 0bar right up to 0.5+bar and conseqently a big increase in fuel consumption.
The trick is to find the throttle postion to keep you at 80mph on the flat and DON'T MOVE YOUR FOOT! Seriously, as the tiniest increase at the speed create a disproprtionate increase in boost and fuel consumption.
I find the cause (on classics) maybe partly due to the gearing on the throttle and linkage. The scooby seems to have a directly proportionate throttle linkage. - i.e 1/2 on the pedal = 1/2 opening at the buttlerfly. Many other cars I have looked at don't work like this...they only get 1/2 opening at the butterfly at 3/4 at the pedal (if that makes sense
) so the first 3/4 movement of the pedal only moves the throttle a very small amount, where the last 1/4 of the pedal move the throttle alot.The other cause is the turbo being so sensitive to spooling up at that speed, would be great if you could just switch it off
31 March 2005 | 06:48 PM
#14
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From: From Kent to Gloucestershire to Berkshire
MY02UK with numerous mods. Turbo starts doing things by about 60, close to full boost by about 65 in top. By courtesy of a properly set-up map, still does a comfortable 300 miles/tank (call it 28-29mpg) going along at a fairly steady 85ish mph on the motorway (but never at that sort of speed in the UK, of course). Suits me!
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