Howdy. I've asked this of several people who own Saturns, and nobody can tell me the advantage/disadvantage of having the Trac traction switched on versus turning it off. I usually turn it off, because the light annoys me, but if I were on slippery roads, I'd use it. But does it have any effect at all on the mileage? The traction advantage seems so minimal when you know what you're doing behind the wheel. Snow isn't the problem it's made out to be, but this Traction thing looks like it's mostly a useless bell/whistle, like the switch that makes it shift differently. I've never noticed a difference there, either. Tedrick
Simply put, traction control prevents wheel slippage by applying brakes and reducing power to the specific slipping wheel so that that all wheels keep good traction on the road. I have never heard of TC affecting mileage at all. TC is great if you want more traction on rainy, snowy, or any road conditions. By improving traction, you basically improve your handling too.
What TC does affect is your speed. Naturally, if TC needs to slow down a misbehaving wheel, ie: you are street racing and want your wheels to spin, then you would want to turn TC off. Otherwise, TTC does work and is intended to be completely invisible to the driver as it does it's job.
Howdy back at you - afik the traction control on my '01 lw300 does not affect the engine or shifting under normal circumstances. What it does do when it detects a wheel slip (on acceleration) is to apply the brake to the slipping wheel. This attempts to divert power to the wheel that still has traction and to regain traction on the slipping wheel. If this is not successful, the engine power is cut back until the wheel slip is eliminated. The dashboard 'low traction' indicator will come on for either of these conditions. There is no need to let up on the accelerator since this is automatic.
Wheel slip is detected by sensing wheel RPM on all wheels and comparing results. Wheel rpm is affected by the wheel radius and radius is a function of tire pressure. What is important to keep in mind is that you should always use identical wheels and tires, keep the inflation to spec and rotate the tires on schedule to keep the radius on all tires identical. If you have a tire that is starting to run flat, then it is a good idea to switch off the traction control until your fix the flat. (of course, never drive on a flat tire unless you want to buy a new tire and wheel).
Where I see the traction control coming on mostly is in wet weather when the car starts to hydroplane. Also on heavy acceleration for passing, I get much better stability with the traction control enabled. Compared to the minivan I used to drive, the lw300 is a muscle car and the ABS/TRAC systems are well appreciated.
Keep the bugs off the bumper and the shiny side up y'all. Oppie
I always recommend that you read the owner's manual (took me 3 times through to get all the significant details). There is a lot of information there about the correct operation and care of your vehicle. Take some of it with a grain of salt and others as the gospel truth. (you decide with the filter of experience)
The automatic compensation of throttle in a low traction event may vary from vehicle to vehicle. The L300 is a drive by wire and the computer actually controls the throttle. The accelerator pedal talks to the computer and has no direct mechanical connection to the throttle. (a bit strange at times).
In a low traction event, the L300 backs off the throttle. On non-drive by wire cars, the engine power is reduced by retarding the spark timing. This is not as effective as the computer controlled throttle. It does work but in either case, for a prolonged loss of traction, it is best to lift your foot slightly off of the pedal.
I'm not sure how the non-drive-by-wire, but otherwise computer controlled engines throttle back. Retarding timing would be one way, reducing or cutting off injectors would be another way.
Anyone out there in Saturn land *KNOW* how the computer throttles back the engine in this case?
We had a couple of inches of good packing snow the other day. On the way home from work, on the parkway which had not been plowed or salted yet, the surface was slushy. The lw300 was handling just wonderfully even with the uneven and slick surface. At about 40mph, I turned off the trac switch. The handling suddenly became much more unstable and I had to very carefully compensate for every furrow and puddle. Switched the traction control back on for the remainder of the trip home. Even changing lanes from a well traveled surface to an un-traveled one was nice and smooth. Got to love technology when it works properly. Oppie
Don't know about the gas mileage aspect. I would suspect it does nothing but "watch" the relative wheel motion. this uses very little power.
I had similar questions about the feature, as well. It's sorta newly emerging Older technology for the masses and we are not used to the feature or the display.
The feature TRAC is great! you hardly notice it, EXCEPT it removes all slipping and sliding. Provides very crisp handling in tight turns, wet roads, etc.
The advise I received was to go out and try to slip the wheels without the TRAC and then put it on. This way you can feel the effect in a controlled off-road situation and anticipate what it does in traffic. ...In the mean time... leave it on!
Short answer is that Traction Control (if all is well) does not affect gas mileage. If you have one tire, especially a drive wheel, that is low on air, it might fool the system into dragging a brake. Not entirely sure if this scenerio is correct but could conceivably cause a loss in mileage. Bottom line is to check tire inflation regularly and rotate tires on schedule for best performance. Oppie
MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.