What can be done to add more off the line accelleration to my 03 NB 911?

 

Lots of things, for example:

• Air Intake
• Exhaust (Headers, Cats, Mufflers)
• Throttle Body
• Chip
• Supercharger (RUF, VF, etc)
• Turbocharger (IMA and TPC make kits, both here on the forum)
• Bore Kit (3.6 to 3.8+)
• or have the engine rebuilt with some different internalts
• other stuff i might have forgotten

It all depends how ballistic you want to go.

However, Porsche Trannies are not drag transmissions, and do not like being power shifted. If you decide to go way above stock power, also do breakes, suspension, heavy duty clutch, and wider tires. Might also want to consider Front bumper & wing for more downforce at that point.

 

Lighter weight will help a lot without taxing the transmission, and it makes it easier in other components such as brakes etc. Lighter wheels and lighter exhaust can save you 50 pounds depending on what you have now.

 

+1

I put my car on the following weight loss program:


GT3 wheels replaced with Carrera lightweight wheels:
-cost: 0
-saving: 20lb rotating weight, equivalent to 80-90lb static weight.

Braille battery 31Ah
-cost: $200
-saving: 30lb

Removed spare wheel
-cost: $40 (tire repair kit+foam)
-saving: 12lb

Fabspeed exhaust:
-cost: $1100
-saving: 12lb

Fabspeed x-pipe:
-cost: $1500
-saving: 10lb

 

Do you use the Braille battery for daily driver? Issues?

 

No issues when car is used regularly. But since the standard battery is 90Ah, you need to use a maintenance charger if not using the car for a while. I left the car for about 10 weeks in cold weather just before Christmas and then I was unable to start the car. Now I use a maintenance charger if leaving the car stationary for more than two weeks.

 

did you find the fabspeed x-pipe to make a difference?

 

Remember what Newton said, F=MA. With the equation being linear, every % change in mass (weight/gravity) will give the same change in acceleration. So a 144 lb reduction in a 3000 lb car will result in a 4.8% reduction in weight and an increase in acceleration of 4.8%. External forces of drag, friction internal and external not withstanding. So, theoretically, zero to 60 in 5 sec before should equal 0 to 60 in 4.76 sec. If you want 0 to 60 in 4.0 sec, get a TT.
James Greer

 

C70Pete:

I have not fitted the x-pipes on the car yet. Will fit them together with an ECU upgrade before the driving season starts over here in April.

GREERJ1:

+1

So, for a 300bhp 3000lb car like the 996 3.4, a ~5% weight loss will give the same straight line acceleration as if the car had ~5%/~15bhp more power (not taking wind resistance into account).

The lighter car will be more responsive, corner and brake better. While the higher power car will have the better high speed acceleration and the highest top speed.

 

Uhh..bingo

 

 

You hit it right on the money.

 

Physics rocks and an engineering degree doesn't hurt either. This is why the little Lotus Esprit kills the 996 at the track. At least mine. Could be my driving skills though.
James Greer