GT4 final drive discussion
#47
Race Car
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BMW has had it for several years . Guys used to take it out for quicker shifts. Carl
#48
Nordschleife Master
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Glad you are happy with them. Bill or Pete might want to run actual thrust forces on charts but the common comment is that gears are worth 25whp. That decreases the higher you go, but in 3rd gear that likely true.
#49
Nordschleife Master
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Dog boxes engage far more aggressively than synchro boxes. The 997 sequential is one of those and has narrower gears than the Cayman gearboxes. Its not about reducing shockload on the actual gear teeth.
#50
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The other thing to mention is that with 3rd gear now so close to 2nd gear, I have not found a need for 2nd gear on a track yet. That may change if I go back to Thompson - doubt I will though. Haven't tried Palmer yet. Neither LRP or Watkins requires 2nd. Also, with this new gearing, I have to use to 6th gear after exiting turn 4 at the Glen...hitting 147mph before braking for the bus-stop. These new gears are perfect. If I decide to start tracking the GT4 and get rid of my CR, I may have to make the same gear changes. On street driving, I find myself going from 2nd gear to 4th gear skipping 3rd.
If the gears can be used in the GT4 similar to what I have done in the CR with a similar 3.8 engine, I would highly recommend it. If anyone is around LRP, look me up for a drive or ride-along.
If the gears can be used in the GT4 similar to what I have done in the CR with a similar 3.8 engine, I would highly recommend it. If anyone is around LRP, look me up for a drive or ride-along.
#51
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The other thing to mention is that with 3rd gear now so close to 2nd gear, I have not found a need for 2nd gear on a track yet. That may change if I go back to Thompson - doubt I will though. Haven't tried Palmer yet. Neither LRP or Watkins requires 2nd. Also, with this new gearing, I have to use to 6th gear after exiting turn 4 at the Glen...hitting 147mph before braking for the bus-stop. These new gears are perfect. If I decide to start tracking the GT4 and get rid of my CR, I may have to make the same gear changes. On street driving, I find myself going from 2nd gear to 4th gear skipping 3rd.
If the gears can be used in the GT4 similar to what I have done in the CR with a similar 3.8 engine, I would highly recommend it. If anyone is around LRP, look me up for a drive or ride-along.
If the gears can be used in the GT4 similar to what I have done in the CR with a similar 3.8 engine, I would highly recommend it. If anyone is around LRP, look me up for a drive or ride-along.
#52
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I have the following videos but not in car. I upgraded to the HD2X system with Race-Keeper in the Spring and they are still working on a 3rd camera option...
Lime Rock Park - https://www.youtube.com/watch?v=mFyp...ature=youtu.be
Watkins Glen (this is with a broken rear sway bar!!!) - https://www.youtube.com/watch?v=_YcS...ature=youtu.be
Lime Rock Park - https://www.youtube.com/watch?v=mFyp...ature=youtu.be
Watkins Glen (this is with a broken rear sway bar!!!) - https://www.youtube.com/watch?v=_YcS...ature=youtu.be
#53
Burning Brakes
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I also agree with the above remarks about how most guys are just going to talk about this for a few years until their clutch needs replacing or their warranty goes out. Guys don't crack open a brand new gearbox. I have sold exactly 1 set of gears to a 981 racer. All other sets of Cayman gears I have sold have gone into 987 cars. The market for GT4 transmission parts won't even form for 2-3 years.
Matt, I believe there has been a sea change with respect to the Cayman platform in recent years. The car has gained much more respect that it had in its early days. People have seen how much potential the car has once the performance is unleashed. There is more interest than ever in Caymans being used on the track or being converted to dedicated track cars. For most of us, the GT4 is a $100K+ car. For many of us, an additional $5K - $10K tranny/gearing upgrade, if it was the ideal combination, would be very compelling. Do I need to send you a deposit now to convince you?
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Last edited by Beantown Kman; 10-04-2015 at 10:21 AM.
#54
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This recipie, one of a very good enthusiast car that has significant potential that can clearly be unlocked, has in the past made for epic tuner cars. The GT4 is great in most ways, but it's crying out for more thrust. Gearing is the most obvious way to address this, and I suspect many will be in search of a solution. Normally making this investment makes no sense, but in the GT4's case the next "step up" is a 45k more expensive GT3 (automatic only) or an older GT3. Both have issues of their own, making the modification route interesting in a way that it normally isn't.
#55
Nordschleife Master
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I don't agree. Having owned three 987's and now a GT4, I can say that while I never felt the need for different gearing in my 987's, I feel otherwise with my GT4. I have a highly modified 987.2 track car that I am very happy with. But my expectations are different for my GT4. The GT4 has the potential to perform at a very high level and it is being constrained by the gearing. If there was a viable option for an ideal transmission/gear package, similar to the 997 GT3 RS, I would buy it immediately.
Matt, I believe there has been a sea change with respect to the Cayman platform in recent years. The car has gained much more respect that it had in its early days. People have seen how much potential the car has once the performance is unleashed. There is more interest than ever in Caymans being used on the track or being converted to dedicated track cars. For most of us, the GT4 is a $100K+ car. For many of us, an additional $5K - $10K tranny/gearing upgrade, if it was the ideal combination, would be very compelling. Do I need to send you a deposit now to convince you?![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Matt, I believe there has been a sea change with respect to the Cayman platform in recent years. The car has gained much more respect that it had in its early days. People have seen how much potential the car has once the performance is unleashed. There is more interest than ever in Caymans being used on the track or being converted to dedicated track cars. For most of us, the GT4 is a $100K+ car. For many of us, an additional $5K - $10K tranny/gearing upgrade, if it was the ideal combination, would be very compelling. Do I need to send you a deposit now to convince you?
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Sure, some shop project cars and dedicated racecars will get it done but your average track day guy? Not anytime soon. That guy will be the exception, not the rule. But if they want to spend their money I'll take it from them happily.
#56
Race Director
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Is it possible that this becomes such a commonly needed fix, that opening the gearbox for this particular car becomes the "de rigeur" modification everyone does? If enough people want to shorten the final drive, maybe gtgears et al will finally have a good business case on their hands.
#57
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Personally I'm temped to buy another box to modify to avoid this issue...
For modification a ring and pinion is perhaps an easier sell? It seemed pretty popular for 951s for a while using the S2 part as I recall, and between the RS R&P and the 4:1 Cup there must have been quite a few that went into GT3s? Of course I suspect those were generally factory parts installed, not aftermarket...
For modification a ring and pinion is perhaps an easier sell? It seemed pretty popular for 951s for a while using the S2 part as I recall, and between the RS R&P and the 4:1 Cup there must have been quite a few that went into GT3s? Of course I suspect those were generally factory parts installed, not aftermarket...
#58
Burning Brakes
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For me, a R&P would have to be coupled with a longer 6th gear for highway cruising. I just got back from an extended road trip and it's marginally too short as it is.
#59
Addict
Rennlist Member
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Its just too bad we are stuck with 2nd being so tall.