M6 remote starters inside.
In any case, with a modern remote starter setup and the use of a properly adjusted parking brake, you have nothing to worry about.
1. You already mentioned that the parking brake wasn't used.
2. A 4-cylinder Civic weighs less and has less engine compression to overcome than an LS1 f-body (hence a starter motor has a better chance of moving the car)
3. It must have been an older remote start setup without the safety timeout circuitry. There is no way a starter motor, even running continuously, can generate enough engine revolutions on a car left in gear to fool the remote starter brains into thinking the engine is running. A modern remote starter would give up after a few seconds of being unable to start the engine - so the car would never move far.
The misconception that a starter motor (even without the parking brake engaged) does not have enough power to start the car and have it drive away is simply not true.
The starter motor is capable of spinning in excess of 6000 RPM when unloaded but is generally designed to turn the engine at 200-250 rpm when starting, let's go with 250 RPM for now.
First gear in an M6 F-body has a ratio of 2.66:1. That means that if the starter motor turns the engine at 250 RPM, the drive shaft turns at 94 RPM (I'm rounding for simplicity).
Manual transmission F-bodies have a rear end ratio of 3.42:1. That means that the 94 RPM of the drive shaft becomes 27.5 RPM at the wheel. 27.5 RPM equals 1650 revs per hour.
The 16" wheel/tire (245/50R16) turns 813 times in a mile (the 275/40R17 turns 811 so they're about the same). 1650 revs per hour divided by 813 revs per mile gives 2.03 miles per hour.
So, assuming the starter motor can move the weight of the car and assuming that the battery can keep up the average 350 amps current draw for any length of time, the car will go blazing across the parking lot at the impressive speed of 2 miles per hour - slower than my mother-in-law using her walker (average adult walking speed is about 3.1 mph). Bear in mind that the 250 RPM rating of the starter motor is for turning the engine alone - with the added resistance of the weight of the car, the starter motor would turn much slower resulting in even less speed moving the car.
But feel free to believe in remote starters causing manual transmission cars to go flying some distance into various expensive obstacles. After all, it must be true if somebody said it on the internet.
Last edited by WhiteBird00; May 19, 2009 at 10:33 AM.
The starter motor is capable of spinning in excess of 6000 RPM when unloaded but is generally designed to turn the engine at 200-250 rpm when starting, let's go with 250 RPM for now.
First gear in an M6 F-body has a ratio of 2.66:1. That means that if the starter motor turns the engine at 250 RPM, the drive shaft turns at 94 RPM (I'm rounding for simplicity).
Manual transmission F-bodies have a rear end ratio of 3.42:1. That means that the 94 RPM of the drive shaft becomes 27.5 RPM at the wheel. 27.5 RPM equals 1650 revs per hour.
The 16" wheel/tire (245/50R16) turns 813 times in a mile (the 275/40R17 turns 811 so they're about the same). 1650 revs per hour divided by 813 revs per mile gives 2.03 miles per hour.
So, assuming the starter motor can move the weight of the car and assuming that the battery can keep up the average 350 amps current draw for any length of time, the car will go blazing across the parking lot at the impressive speed of 2 miles per hour - slower than my mother-in-law using her walker (average adult walking speed is about 3.1 mph). Bear in mind that the 250 RPM rating of the starter motor is for turning the engine alone - with the added resistance of the weight of the car, the starter motor would turn much slower resulting in even less speed moving the car.
But feel free to believe in remote starters causing manual transmission cars to go flying some distance into various expensive obstacles. After all, it must be true if somebody said it on the internet.
I used to have a jeep wrangler with a manual trans, stock 3.73 gears and 33" tall tires. The starter could drive the jeep on its own up hill in my driveway, i would guess a 15 degree slope. On flat surface it was more than enough to start the engine.
All the math in the world is not going to compare to real world experience.
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How's this for real world experience? I don't have a remote start on my car but I figure sitting in the car and holding the key in the start position would be the same thing. Besides, as previously stated, a modern remote starter will time out if the engine doesn't start quickly so this experiment is more like it would have been back in the days of carburetors and unsophisticated electronics.
So, at lunch today I went out and tried it. I used the parking lot where I work because it's relatively level - there's enough slope to make rain water drain but this is Florida... everywhere is basically flat. The car is in good shape with only 70K miles but has no modifications that would affect this test (gears, high compression, etc.) although I'm sure my 250 pounds didn't help any. The battery is a year-old red top and the starter is original. It has always started immediately without excessive cranking.
The car lurched and shuddered and moved a little over eight feet before I gave up for fear of destroying the starter. It never came close to starting and driving off. It took almost ten seconds to go that eight feet - much longer than a remote starter would keep trying.
I suppose it's possible on a low compression engine (e.g. 8.8 in the six cylinder Jeep), in a relatively light vehicle, with a good starter and battery, with the parking brake disengaged, and an old remote starter without the safety timeout feature, that a vehicle could move far enough to actually run into something.
But that's meaningless to somebody wanting to buy a remote starter for the F-body these days. Yes, moving a couple of feet is enough to dent another car or a garage door but using the parking brake will avoid even that possibility.





