Maximizing mpg
#47
Addict
Lifetime Rennlist
Member
Lifetime Rennlist
Member
But WHAT a 10!
Cheers,
Mike
#48
Nordschleife Master
My average is right around 19mpg which includes both city and hwy. best I ever did was right after a tune up, got 24 mostly hwy driving.
looked at 02 sensors for a 993, ???? why are they so expensive? are the Volvo ones direct replacement?
for $100 I'd replace all of them but $450 for a set! I don't think so.
looked at 02 sensors for a 993, ???? why are they so expensive? are the Volvo ones direct replacement?
for $100 I'd replace all of them but $450 for a set! I don't think so.
#50
Nordschleife Master
Thanks! Have you used the universal fit sensors and changed the plugs to adapt to your 993? a good way to save $300
#52
Addict
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Leading question folks:
How much would you be prepared to pay to improve performance by 10%, gas mileage by 20% and at the same time reduce engine wear by a factor of 5?
$1,000 or $10,000?
How much would you be prepared to pay to improve performance by 10%, gas mileage by 20% and at the same time reduce engine wear by a factor of 5?
$1,000 or $10,000?
#55
Advanced
Thread Starter
Join Date: Oct 2011
Location: los altos ca
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
Thank you all for the great input. I just bought a scangauge II (vs e because of a better trip calculator) to help me better understand how to influence my mpg.
The SG can be calibrated by changing the speed measurements. As I was trying to calibrate the settings using my odometer by measuring the time it takes to complete a certain distance and compare this with my SG reading, it hit me.
Would all my measurements be wrong because my rims are 18' vs the original stock rims (98 993 cab)? If so is my odometer underrepresenting the distance travelled, And have my prior mpg calculations done the old fashioned way (distance travelled divided by gas amount to refill tank), been underestimated too.
Is that the case? What would the adjustment have to be?
I can still calibrate my SG with external distance markers and measuring time, but question is puzzling me. Has anyone gone through a similar calibration and can share the sg adjustments?
Thank you
The SG can be calibrated by changing the speed measurements. As I was trying to calibrate the settings using my odometer by measuring the time it takes to complete a certain distance and compare this with my SG reading, it hit me.
Would all my measurements be wrong because my rims are 18' vs the original stock rims (98 993 cab)? If so is my odometer underrepresenting the distance travelled, And have my prior mpg calculations done the old fashioned way (distance travelled divided by gas amount to refill tank), been underestimated too.
Is that the case? What would the adjustment have to be?
I can still calibrate my SG with external distance markers and measuring time, but question is puzzling me. Has anyone gone through a similar calibration and can share the sg adjustments?
Thank you
#57
Rennlist Member
Get/borrow a GPS, find a flat straight road, maintain a steady speed using your cruise control and calibrate your speedometer...and odometer. Go from there.
#58
In terms of your engines influence on fuel economy the largest losses are caused by carbon deposit build up in the engine squish area, valves , pistons, cat and o2 sensors. It absorbs your fuel and tricks your o2 sensor into sending a lean condition to your cars computer which turns around and increases your injectors pulse width and adjusts timing. This creates a vicious cycle as the fuel trapped in the carbon does not thoroughly burn and created more carbon.
This is greatly increased by the reformulated gasoline we have been burning in our cars for the last 20 years. The next generation of direct injection engines is turning out to be a headache for manufacturers as they suffer even more from this issue.
Fuel trim on a car with 40k can be out as much as 7-12% without setting off a code.
Get rid of the carbon and improve performance and fuel economy.
This is greatly increased by the reformulated gasoline we have been burning in our cars for the last 20 years. The next generation of direct injection engines is turning out to be a headache for manufacturers as they suffer even more from this issue.
Fuel trim on a car with 40k can be out as much as 7-12% without setting off a code.
Get rid of the carbon and improve performance and fuel economy.