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Jake Raby · 09-27-2009, 12:56 PM

The 6 speed may or may not be of benefit based on your application more than anything.. The fact is the 6 speed is a much stronger arrangement, able to take any amount of power we can throw at it. The gear ratios and spreads are great for some applications, and they suck for others.

The 6 speed is a heavier and longer tranny than the 5 speed.. That may or not be of concern for you. The 6 speed does have larger CVs and uses a heavier duty input shaft with more selections for clutch packages available.

I have a 5 speed in my Boxster and a 6 speed in my 911. The 6 speed was optimum for my Wife's Land Speed Racing last weekend, but it doesn't work very well for my DEs at Road Atlanta, where the 5 speed seems to be much more effective. She was at the top end of 5th gear at 149.280 MPH with 200 RPM of potential left... I seldom touch 5th at Road Atlanta except the back straight and I use 6th gear maybe once per week driving the car daily.

You should select the 6 speed based on what your application of the engine and car will be. We'll couple that with the engine package that I design for you, as some optimize the 6 speed much better than the 5 speed and vice versa.

The difference in my engine isn't really the HP, its what we do with the concentration of the engine's power and how much TORQUE we add to the combination.

That said, over this winter I am starting with a 3.2 core and building a Stage III 3.6 for my '98 Boxster. I will be coupling this to a 6 speed tranny for a dual purpose street/ DE much like my 911 and we'll be converting the 911 into a full blown LSR car for my Wife.

I am choosing the 6 speed due to the extreme torque the 3.6 engine in stage III tune will be producing along with it's 8,500 RPM rev range...

Its all up to YOUR application, I'll work with you to design a complimentary package; thats what I do.

09-27-2009, 12:56 PM	#4
Jake Raby Engine Surgeon Join Date: Aug 2008 Location: Cleveland GA USA Posts: 2,425	The 6 speed may or may not be of benefit based on your application more than anything.. The fact is the 6 speed is a much stronger arrangement, able to take any amount of power we can throw at it. The gear ratios and spreads are great for some applications, and they suck for others. The 6 speed is a heavier and longer tranny than the 5 speed.. That may or not be of concern for you. The 6 speed does have larger CVs and uses a heavier duty input shaft with more selections for clutch packages available. I have a 5 speed in my Boxster and a 6 speed in my 911. The 6 speed was optimum for my Wife's Land Speed Racing last weekend, but it doesn't work very well for my DEs at Road Atlanta, where the 5 speed seems to be much more effective. She was at the top end of 5th gear at 149.280 MPH with 200 RPM of potential left... I seldom touch 5th at Road Atlanta except the back straight and I use 6th gear maybe once per week driving the car daily. You should select the 6 speed based on what your application of the engine and car will be. We'll couple that with the engine package that I design for you, as some optimize the 6 speed much better than the 5 speed and vice versa. The difference in my engine isn't really the HP, its what we do with the concentration of the engine's power and how much TORQUE we add to the combination. That said, over this winter I am starting with a 3.2 core and building a Stage III 3.6 for my '98 Boxster. I will be coupling this to a 6 speed tranny for a dual purpose street/ DE much like my 911 and we'll be converting the 911 into a full blown LSR car for my Wife. I am choosing the 6 speed due to the extreme torque the 3.6 engine in stage III tune will be producing along with it's 8,500 RPM rev range... Its all up to YOUR application, I'll work with you to design a complimentary package; thats what I do.