The rods should be here today!

 

The tranny had all six gear ratio changed. First and second were made longer, third, fourth, fifth and sixth were shortened. Don't remember all the gear ratio's off hand, but first was something like a 3.18-1 which with our redline takes first to about 72 mph. All gear ratios are listed in our thread in the Tuner/Modification section. All gears were made using the 28 mm width square cut teeth like the RSR tranny to add strength. One of the shafts was rifle drilled to provide additional oiling to the upper gears. All gears were friction coated and the shafts and case interior was coated to repel oil. Syncro's are steel and black carbon coated. The case was drilled for an external oil cooler and pump. A billet RSR LSD was utilized. Case was tapped for tranny oil temperature probe.

The tranny was built by Brian Copan.

 

I just looked up the tranny ratio's and stock 6 speed and TIP ratio's.

We used the following gears from first thru sixth.

3.167:1, 1.938:1, 1.474:1, 1.174:1, 0.968:1 and 0.821:1

Stock gearing on the six speed is:

3.82:1, 2.05:1, 1.41:1, 1.12:1, 0.92:1 and 0.85:1

Stock TIP gears:

3.59:1, 2.19:1, 1.41:1, 1.00:1 and 0.83:1

 

Interesting selection. What was your motivation for this change and the resulting ratios?

 

Chad, you truely amaze me everytime. By the time that car is built it will be worth more than a CGT The first gear goes as high as BBi built that black 996tt with two more mph.

 

Brian Copan suggested those ratio's based on and motor designed for about 850 hp and a redline of 9400 rpm's. This was going back a few years ago.

The stock first gear was pretty useless. The traction was none existent and the time in first was extremely short. The 3.16-1 is very close to what is used for first in the CGT. Considering we will have over twice the hp of the CGT coming on at about 3200 rpm's ........ this should be a very useful first gear for all standing starts an I really didn't build the car for standing starts.

The stock second gear has the same issues as first but to a lesser degree.

The stock third through sixth never seemed to have enough response so we went the other direction with these gears.

In all cases the ratio's were chosen to keep the rpm's at the start of the torque curve or the sweet spot after the shift was completed.

Finally, this body style likes to "fly" depending on road and wind conditions somewhere just North of 235/240 mph. I wasn't interested in finding out exactly where. I'm going to leave that one for joetwint.

 

Now I see why you are going with GTxxxx turbos Chad to hold up top

 

Hey thanks.....I think?

 

Hey, I'll be right behind you on this one.

 

 

joe ......... I don't have a pilot's license and I'm not exactly sure where these babies take flight.

 

Neither do I.Ya think I need one?

 

If you plan on going much faster without some serious wind tunnel time and body modifications ............. yes.

 

Pilot, wind tunnels, aero space engineers......what is brewing up here fellas? You guys are not planning to fly to the moon right

 

Hey back in the day I was an Instructor Pilot. If that'll get me a ride in the beast I'll be happy to give you a lesson Joe