Best RPM to Launch at for 1/4 MT?

Phimosis · 07-24-2010, 08:32 PM

Street tires don't work great on a well prepped track. They will stick better than on bare pavement, but when they start to let go, they let go all at once.

Slicks will give a more progressive loss of traction.

With that said, you launch at 3,000 rpm on the street and you get a steady controled wheelspin and off you go. At the track, 3,000 rpm wont yield any wheelspin and you'll likely bog the engine for a slow start.

Launch it at 3,500 and let the clutch out too fast and your tires will be up in smoke.

As a baseline, I would try 3,500 and let the clutch out nice and controlled. The key is to not get too excited and let the clutch out too fast. ;-)

370Zsteve · 07-24-2010, 08:36 PM

Quote:

Originally Posted by Phimosis

Street tires don't work great on a well prepped track. They will stick better than on bare pavement, but when they start to let go, they let go all at once.

Slicks will give a more progressive loss of traction.

With that said, you launch at 3,000 rpm on the street and you get a steady controled wheelspin and off you go. At the track, 3,000 rpm wont yield any wheelspin and you'll likely bog the engine for a slow start.

Launch it at 3,500 and let the clutch out too fast and your tires will be up in smoke.

As a baseline, I would try 3,500 and let the clutch out nice and controlled. The key is to not get too excited and let the clutch out too fast. ;-)

Car & Driver agrees with you. +1 rep

tranceformer · 07-24-2010, 11:42 PM

Quote:

Originally Posted by Phimosis

Street tires don't work great on a well prepped track. They will stick better than on bare pavement, but when they start to let go, they let go all at once.

Slicks will give a more progressive loss of traction.

With that said, you launch at 3,000 rpm on the street and you get a steady controled wheelspin and off you go. At the track, 3,000 rpm wont yield any wheelspin and you'll likely bog the engine for a slow start.

Launch it at 3,500 and let the clutch out too fast and your tires will be up in smoke.

As a baseline, I would try 3,500 and let the clutch out nice and controlled. The key is to not get too excited and let the clutch out too fast. ;-)

+1

All tracks are different, and of course conditions vary.

3500-4000 RPM seems to be the sweet spot for my Z at my local track. Lowering the tire pressure to 25ish PSI seems to help as well.

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07-24-2010, 08:32 PM	#1 (permalink)
Phimosis Enthusiast Member Join Date: May 2009 Location: Oildale, CA Posts: 412 Drives: 2013 911 4S Rep Power: 416	Street tires don't work great on a well prepped track. They will stick better than on bare pavement, but when they start to let go, they let go all at once. Slicks will give a more progressive loss of traction. With that said, you launch at 3,000 rpm on the street and you get a steady controled wheelspin and off you go. At the track, 3,000 rpm wont yield any wheelspin and you'll likely bog the engine for a slow start. Launch it at 3,500 and let the clutch out too fast and your tires will be up in smoke. As a baseline, I would try 3,500 and let the clutch out nice and controlled. The key is to not get too excited and let the clutch out too fast. ;-)