 | |
computer economy chip
Volvo automobiles Volvo automobiles. (alt.autos.volvo)
 |
| | Thread Tools | Display Modes |
#11
 
| |||
| |||
|
Re: computer economy chip -
08-11-2009
, 06:27 AM
|
Leftie wrote: Centre Parting wrote: Leftie wrote: Tony wrote: Leftie wrote: Centre Parting wrote: Leftie wrote: masqqqqqqq (AT) aol (DOT) com wrote: Is there such a thing as a computer upgrade chip for a 92 960 that would increase fuel mileage? Even though it would reduce acceleration......... I doubt it, but the good news is you can get pretty much the same result by increasing tire pressure to 10% below the max pressure listed on the sidewalls, ... but don't brake or corner too hard in the wet! If you are running good (not even great, just "good") tires it won't be a problem. If it seems a little too stiff, back off the pressure one or two psi at a time. I have Goodyear F1 on the back of my 940 and had the pressure up at +8psi for a long trip 80% loaded. After finishing the trip and going back to normal loads I didn't reduce the pressure for a few days, the back end does breakaway in the wet and you do lose grip, it is simple physics, the economy goes up because the contact patch with the road is reduced, you will end up wearing your tyres in the middle and have less chance at avoiding unexpected obstacles. Not worth the risk IMO. If you want economy this way then much better to fit the skinniest tyres (correctly inflated) that will go on the rim, and you benefit from reduced air resistance as well as rolling resistance. Of course making sure the tyres are not under-inflated is important too. -- Tony It's not quite that simple. The rolling resistance can be reduced without reducing the size of the contact patch, by making the tire stiffer - i.e. by increasing the pressure 10%. What is the Goodyear F1? If it's a Summer tire With the greatest disrespect, not being a snow-tyre has nothing to do with rain performance. If Summer tyres weren't able to deal with rain, they'd be completely useless - and have absolutely no market. Wrong definition, wrong application to the situation in question. In short, you're wrong. that could well make it slippery - I wouldn't use Summer tires for anything except racing on dry pavement. A good all-season, with somewhat stickier rubber, should be fine running 38psi. Postscript: I just looked, and the F1 is indeed a Summer radial. All-Season tires have a more open tread design than Summer tires, Dry = slick tyres Summer = rain tyres All-season = snow tyres You're reading too much into the names. and this helps in rain. Summer tires aren't "useless" in rain, I just prefer the all-around traction of All-Seasons to the mainly-dry-pavement traction of performance Summer tires. |
pretty much all year round, varying from slight to downpour at any time.
Snow is rare, and ice normally abated with salt.
We have only one type of tyre, no such thing as a summer tyre here, and
I'd day that a F1 here is pretty soft, and has pretty open tread. In
mid europe they have much harsher climates with hotter summer and colder
winters, I guess the US is similar. They have to change tyres because
of how the temperatures affect the rubber, not really to do with whether
there is snow or ice on the roads. Of course they do try to optimise
tread patterns more for typical weathers, but it doesn't make that much
difference.
Any advice about pressures is therefore at least geographical and
seasonal, and probably car and tyre related to. Unless you are an
Engineer and able to experiment I would just follow the manufacturers
advice.
--
Tony
#12
| |||
| |||
|
|
Centre Parting wrote: Leftie wrote: Centre Parting wrote: Leftie wrote: Tony wrote: Leftie wrote: Centre Parting wrote: Leftie wrote: masqqqqqqq (AT) aol (DOT) com wrote: Is there such a thing as a computer upgrade chip for a 92 960 that would increase fuel mileage? Even though it would reduce acceleration......... I doubt it, but the good news is you can get pretty much the same result by increasing tire pressure to 10% below the max pressure listed on the sidewalls, ... but don't brake or corner too hard in the wet! If you are running good (not even great, just "good") tires it won't be a problem. If it seems a little too stiff, back off the pressure one or two psi at a time. I have Goodyear F1 on the back of my 940 and had the pressure up at +8psi for a long trip 80% loaded. After finishing the trip and going back to normal loads I didn't reduce the pressure for a few days, the back end does breakaway in the wet and you do lose grip, it is simple physics, the economy goes up because the contact patch with the road is reduced, you will end up wearing your tyres in the middle and have less chance at avoiding unexpected obstacles. Not worth the risk IMO. If you want economy this way then much better to fit the skinniest tyres (correctly inflated) that will go on the rim, and you benefit from reduced air resistance as well as rolling resistance. Of course making sure the tyres are not under-inflated is important too. -- Tony It's not quite that simple. The rolling resistance can be reduced without reducing the size of the contact patch, by making the tire stiffer - i.e. by increasing the pressure 10%. What is the Goodyear F1? If it's a Summer tire With the greatest disrespect, not being a snow-tyre has nothing to do with rain performance. If Summer tyres weren't able to deal with rain, they'd be completely useless - and have absolutely no market. Wrong definition, wrong application to the situation in question. In short, you're wrong. that could well make it slippery - I wouldn't use Summer tires for anything except racing on dry pavement. A good all-season, with somewhat stickier rubber, should be fine running 38psi. Postscript: I just looked, and the F1 is indeed a Summer radial. All-Season tires have a more open tread design than Summer tires, Dry = slick tyres Summer = rain tyres All-season = snow tyres You're reading too much into the names. and this helps in rain. Summer tires aren't "useless" in rain, I just prefer the all-around traction of All-Seasons to the mainly-dry-pavement traction of performance Summer tires. The names and specs are also geographical, In N.Ireland we have rain pretty much all year round, varying from slight to downpour at any time. Snow is rare, and ice normally abated with salt. We have only one type of tyre, no such thing as a summer tyre here, and I'd day that a F1 here is pretty soft, and has pretty open tread. In mid europe they have much harsher climates with hotter summer and colder winters, I guess the US is similar. They have to change tyres because of how the temperatures affect the rubber, not really to do with whether there is snow or ice on the roads. Of course they do try to optimise tread patterns more for typical weathers, but it doesn't make that much difference. Any advice about pressures is therefore at least geographical and seasonal, and probably car and tyre related to. Unless you are an Engineer and able to experiment I would just follow the manufacturers advice. -- Tony |
Good point about geographical differences, but I have to disagree on
two points: you don't have to be an engineer to experiment with tire
pressures - just don't exceed the maximum or minimum rated pressures.
And the difference between Summer and Winter tires here *is* about grip,
not about how the seasons affect the rubber, except that soft compound
snow tires don't hold up well in Summer heat.
#13
| |||
| |||
|
|
Tony wrote: Centre Parting wrote: Leftie wrote: Centre Parting wrote: Leftie wrote: Tony wrote: Leftie wrote: Centre Parting wrote: Leftie wrote: masqqqqqqq (AT) aol (DOT) com wrote: Is there such a thing as a computer upgrade chip for a 92 960 that would increase fuel mileage? Even though it would reduce acceleration......... I doubt it, but the good news is you can get pretty much the same result by increasing tire pressure to 10% below the max pressure listed on the sidewalls, ... but don't brake or corner too hard in the wet! If you are running good (not even great, just "good") tires it won't be a problem. If it seems a little too stiff, back off the pressure one or two psi at a time. I have Goodyear F1 on the back of my 940 and had the pressure up at +8psi for a long trip 80% loaded. After finishing the trip and going back to normal loads I didn't reduce the pressure for a few days, the back end does breakaway in the wet and you do lose grip, it is simple physics, the economy goes up because the contact patch with the road is reduced, you will end up wearing your tyres in the middle and have less chance at avoiding unexpected obstacles. Not worth the risk IMO. If you want economy this way then much better to fit the skinniest tyres (correctly inflated) that will go on the rim, and you benefit from reduced air resistance as well as rolling resistance. Of course making sure the tyres are not under-inflated is important too. -- Tony It's not quite that simple. The rolling resistance can be reduced without reducing the size of the contact patch, by making the tire stiffer - i.e. by increasing the pressure 10%. What is the Goodyear F1? If it's a Summer tire With the greatest disrespect, not being a snow-tyre has nothing to do with rain performance. If Summer tyres weren't able to deal with rain, they'd be completely useless - and have absolutely no market. Wrong definition, wrong application to the situation in question. In short, you're wrong. that could well make it slippery - I wouldn't use Summer tires for anything except racing on dry pavement. A good all-season, with somewhat stickier rubber, should be fine running 38psi. Postscript: I just looked, and the F1 is indeed a Summer radial. All-Season tires have a more open tread design than Summer tires, Dry = slick tyres Summer = rain tyres All-season = snow tyres You're reading too much into the names. and this helps in rain. Summer tires aren't "useless" in rain, I just prefer the all-around traction of All-Seasons to the mainly-dry-pavement traction of performance Summer tires. The names and specs are also geographical, In N.Ireland we have rain pretty much all year round, varying from slight to downpour at any time. Snow is rare, and ice normally abated with salt. We have only one type of tyre, no such thing as a summer tyre here, and I'd day that a F1 here is pretty soft, and has pretty open tread. In mid europe they have much harsher climates with hotter summer and colder winters, I guess the US is similar. They have to change tyres because of how the temperatures affect the rubber, not really to do with whether there is snow or ice on the roads. Of course they do try to optimise tread patterns more for typical weathers, but it doesn't make that much difference. Any advice about pressures is therefore at least geographical and seasonal, and probably car and tyre related to. Unless you are an Engineer and able to experiment I would just follow the manufacturers advice. -- Tony Good point about geographical differences, but I have to disagree on two points: you don't have to be an engineer to experiment with tire pressures - just don't exceed the maximum or minimum rated pressures. And the difference between Summer and Winter tires here *is* about grip, not about how the seasons affect the rubber, except that soft compound snow tires don't hold up well in Summer heat. |
bursting might be a problems aswell.
I can't say I know directly for sure, but Engineers I speak with in
mainland Europe tell me the rubber in winder tyres is too soft for
summer use, and summer tyres become too hard in winter. The rubber
doesn't flex properly or does not provide enough stiffness, and the
wrong tyres becomes dangerous when used in the wrong temperature even if
the road is dry.
--
Tony
#14
| |||
| |||
|
|
Leftie wrote: Tony wrote: Leftie wrote: Centre Parting wrote: Leftie wrote: masqqqqqqq (AT) aol (DOT) com wrote: Is there such a thing as a computer upgrade chip for a 92 960 that would increase fuel mileage? Even though it would reduce acceleration......... I doubt it, but the good news is you can get pretty much the same result by increasing tire pressure to 10% below the max pressure listed on the sidewalls, ... but don't brake or corner too hard in the wet! If you are running good (not even great, just "good") tires it won't be a problem. If it seems a little too stiff, back off the pressure one or two psi at a time. I have Goodyear F1 on the back of my 940 and had the pressure up at +8psi for a long trip 80% loaded. After finishing the trip and going back to normal loads I didn't reduce the pressure for a few days, the back end does breakaway in the wet and you do lose grip, it is simple physics, the economy goes up because the contact patch with the road is reduced, you will end up wearing your tyres in the middle and have less chance at avoiding unexpected obstacles. Not worth the risk IMO. If you want economy this way then much better to fit the skinniest tyres (correctly inflated) that will go on the rim, and you benefit from reduced air resistance as well as rolling resistance. Of course making sure the tyres are not under-inflated is important too. -- Tony It's not quite that simple. The rolling resistance can be reduced without reducing the size of the contact patch, by making the tire stiffer - i.e. by increasing the pressure 10%. What is the Goodyear F1? If it's a Summer tire With the greatest disrespect, not being a snow-tyre has nothing to do with rain performance. If Summer tyres weren't able to deal with rain, they'd be completely useless - and have absolutely no market. Wrong definition, wrong application to the situation in question. In short, you're wrong. that could well make it slippery - I wouldn't use Summer tires for anything except racing on dry pavement. A good all-season, with somewhat stickier rubber, should be fine running 38psi. Postscript: I just looked, and the F1 is indeed a Summer radial. |
|
« Previous Thread
|
Next Thread »
| Thread Tools | |
| Display Modes | |
Linear Mode
| |
Powered by vBulletin
Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.
Copyright ©2000 - 2009, Jelsoft Enterprises Ltd.