Minimum weight change you can 'feel'...
 

What is the minimum weight change YOU could feel in your 911?
For me, it is about 75 lbs - at the track I can notice the difference
right at this point........between a 75 lb passenger and one at 150.

Craig

Great question. I know I can tell when an average size guy (170 lbs?) is in there but I dont really notice when my 5 year old daughter is there (40-50 lbs?) I will have to try and quantify it a little better. I suspect that the better driver - the more perceptive. So if you can feel 75 lbs I probabably could feel 150 lbs :-))

On the street I notice a diff between one dog and two. Each dog is about 50 lbs. So between 50 and 100 lbs

I'd say 50 to 75 lbs. is just right, especially for smaller displacement engines like my 2.4. An almost empty tank of gas makes a HUGE difference, in both acceleration and handling.

When I took out the spare, I noticed a change. What's a spare weigh? 40 lbs, I think.

It might also depend on where the weight is taken from - the bumpers, for instance, might yield the most dramatic feel.

I notice a big difference when removing my spare at the track too.

Come on, a spare weighs 40 lbs? Can't be that heavy.

Spare, jack, misc tools (unneaded from kit), autopump and other none bolted items in trunk= about 70 lbs. I was shocked!!! Another way to shed weight 20ish #'s is to drain the window wiper fluid or just remove the system and replace with a racing res in the trunk area.

that tank is huge

I think the regular res holds like 3 gallons and the secondary holds 1 or 2 more. When I did my bumpers I put the "remove washer for lighter race unit" on my summer list of TTD.

Anyone have a good lead on a race wiper res system?

Not sure about feel but
 

I just thought of an interesting test that could be run using a Gtech Pro. Since it calculates HP once weight is entered. Make several runs with the correct weight of your car entered. Then determine the weight you think you can reduce from your car. Either add or subtract the weight from your actual weight and enter that figure. Take new test runs and observe the new HP calc. The difference should be the HP you can gain by reducing the weight. For example, my car weighs about 2820 lbs. If I enter this figure and measure 165 HP (Gtech measures wheel HP with drag taken into account), then change the weight entered to 2920 lbs, the calculated HP would be greater (more work done in the same time). If the new HP calculates 175, this would tell me a 100 lb drop in weight would yield an equivalent 10 HP increase. I use the term equivalent since the change would not be seen in actual HP increase but in decreased 0-60 time. Maybe I'll try it when it gets warmer.

I think you'll notice anything more when it's out at the corners as opposed to closer to the centre of the car.

Your washer bottle and your spare you 'should' notice more than the 100lb person/object sitting next to you.

Adam