Mussl Kar

Going into my third or forth year the cup R&P. :-)

demiruyar

3.89! Very good!

NJ-GT

For autoX use: the Cup 4.00:1 or even better the Guard 4.25:1 R&P would be my choice. ($4,000 job)

For track use, move stock 5th to 6th, new 3rd, 4th and 5th, using the stock R&P. ($4,000 job)

For track use with $$$ no object, new main shaft, new R&P, new gears ($12k job)

997gt3north

I sort of kind of disagree with the $4000 2nd option. The reason is that 2nd gear will still be too long for 45mph corners that almost all tracks have. With the 3.8 and 4.0 engines it starts to matter much less but with the 3.6 engines and a long 2nd gear, this is really were the 4.0 R&P helps - basically exactly your autoX comment.

As Porsche has already 'tweaked' the marketing message between the 'regular' GT3 and RS (more HP and different gearing), I personally think the RS market is ready for a gear set (especially when it comes with a 7speeed PDK box) that is basically a race specced set of gears - 1st gear that takes you to 50-60mph getting out of pit lane and then short equally spaced set that tops at 180mph. The RS does not have to do 205mph - let the GT2 do that. They should double the downforce again on both axles, make the gearing a true race box, include a Race ABS module, fit 265/345 tires and make the engine a 4.3 liter 525 HP with 400TQ. Sell it for $165k. They could probably sell as many as they could make.

GTgears

While there is no magic, from a purely technical standpoint this statement is inaccurate. You are adding HP with this change. You are not adding BHP. You are adding WHP. You put more horses to the ground in every single gear because you have increased your mechanical advantage.

NJ-GT

Even the 3.6 GT3 has enough torque to break loose at 45 mph in 2nd gear, yes it could use a shorter 2nd gear, but given a limited budget and the choice of short R&P vs. new 3rd, 4th, 5th, re-gearing is the best performance improvement for track use.

There is too much spacing between 2nd and 3rd (this is the one that hurts the most), 3rd and 4th are still too spaced, 4th and 5th are closer but it could be better, and 6th is useless unless the track exceeds 180 mph.

If you can take the 45mph turns at full gas in 2nd gear, yes the 4.0 R&P will help, but it will not resolve everything that happens later.

The 997.1 GT3 really is a 3-speed manual transmission at most tracks.

NJ-GT

I have a chart that support this, I used it for autoX in the 997.1 GT3 RS. I plotted 30 mph to 60 mph speeds with 5mph intervals, using the dyno graph and the gearing, gives WHP at a given speed.

The chart uses the stock 2nd gear in the 997.1 GT3 RS vs. the 4.25 R&P. The WHP difference at 30mph: 50 whp. At 60 mph: 75 whp. As high as 90 whp at certain speeds. These differences are bigger than the power difference between the 997.1 GT3 and the 997.2 GT3 RS 4.0.

So, depending on the vehicle speed range, a short R&P or a short gear is like adding a lot of power. The car still produces 415Hp at its peak, but at a given speed in a given gear, the gear ratio determines how much power is being put to the ground.

Larry Cable

OMG this is the setup I want too!

Larry Cable

+1, r&p, 4.0 LWFW + new LSD ... perfect!

p.s I hate you!

Larry Cable

dont forget that 1-5 on the GT3 and RS are the *same* ratios only 6th and the final differ... and the LWFW of course!

Larry Cable

calling Alex @ Sharkwerks .... calling Alex ... time for a SW "kit" ????

997gt3north

I still stand by my statement that you have to 'use it'. I have been a passenger in many a gt3 and at almost any level but the pro-level, most DE people don't always gear down for certain corners, or parts of corners, where WHP wise they really should. They want to be smooth (which is correct) but they leave lots of time that a pro would never do. I saw this in my own car at Mosport when pro David Empringham took me out.

At Mosport with my 4.0 R&P
Turn 1 - he used 3rd, I used 4th
Turn 2 - he used 3rd then 4th, I used 4th
Turn 3 - he used 3rd then 4th , I used 4th
Turn 8 - he used 3rd, I used 4th
Turn 10 - he gets in 2nd, I use 3rd

One of the reasons that I for the most part was 1 gear up is that it would be very high in the rpm range in the lower gear so as I was not out setting lap records the car was just slightly easier to drive when it isn't at 8400rpms. Besides David being an infinitely better driver than I am, and it being an awesome experience to be driven around Mosport at near 10/10ths, you could just tell that he was extracting all the WHP of the engine - and it added up in the lap time.

For the mancation crowd, he did a 1:32 with me in the car, in my lowly 3.6 GT3 with stock tires. I tried to describe to the gents last year how fast he entered #2 and #4 but it is really beyond words - and his brake technique not to trigger ABS cresting the hill was amazing.

GTgears

Emp. is a bad ****. Watching him drive for the BGB guys this year has been quite the treat. The final laps at Mid-Ohio a few weeks back he showed was separates the men from the boys. There's a very good reason he's currently the points leader in GS in Continental Tire.

Mvez

I need to move to Florida if that's all it costs for 4 gear ratio changes....it ain't $4K in this neck of the woods, and I've got Copans right up I-71.

GTgears

It's more than $4k in parts unless you are using the cheapo Albins gears that certain vendors are peddling.