JNOSOL's GT4 Mods and Notes
06-09-2018, 08:24 AM
#16
Burning Brakes
While I think it should be a recall, if the 3 gear does go, I do believe that the new transmission is an updated part (number) from the original unit. I have not heard of any replaced gearboxes under warranty failing again.
06-09-2018, 09:05 AM
#17
Good to know. How's the stiffer spring for the street? Since the strut isn't valved for the stiffer rate, wouldn't that make it bouncy and unstable?
Oh no, I didn't say the GT4 is better than a 991.2 GT3 at all. The 9k RPM bespoke motor, wide body, and crazy torque - C'mon LOL. What I said what the stock GT4 sounds better than a stock GT3, exhaust sound and not engine valve train sound. I said the GT3 is better than the GT4 in my opinion, but it's not $80k better.
I like manual and PDK equally.
Also, it's disappointing the Porsche didn't put stronger 3rd gear on the GT4. After 78 reported cases on RL alone, you would think they'll recall the issue and replace it with stronger parts.
Oh no, I didn't say the GT4 is better than a 991.2 GT3 at all. The 9k RPM bespoke motor, wide body, and crazy torque - C'mon LOL. What I said what the stock GT4 sounds better than a stock GT3, exhaust sound and not engine valve train sound. I said the GT3 is better than the GT4 in my opinion, but it's not $80k better.
I like manual and PDK equally.
Also, it's disappointing the Porsche didn't put stronger 3rd gear on the GT4. After 78 reported cases on RL alone, you would think they'll recall the issue and replace it with stronger parts.
06-09-2018, 09:46 AM
#18
Pro
Thread Starter
I didn’t install the stiffer springs to test them myself, but I read ride quality is pretty much unchanged. I will say the ride quality is better on the street with the DSC. The car is stiff but it absorbs bumps much better. The DSC is fantastic and I wouldn’t hesitate to do it again. If you have the offset rear toe links from TPC, they will also include a calibration for the DSC that is specifically mapped for those toe links.
06-09-2018, 09:54 AM
#19
Pro
Thread Starter
Based on this, I would advise against any power mods for the GT4 unless you replace the 3rd gear with stronger ones. Porsche is one of the better service companies who stand behind their product, but I'm sure someone is looking at these figures and tightening up on the warranty claims. So if you have power mods, they can "technically" deny your 3rd gear failure warranty claim.
https://rennlist.com/forums/gt4/9614...-database.html
06-09-2018, 12:49 PM
#20
Rennlist Member
06-09-2018, 08:36 PM
#23
Rennlist Member
Good to know. How's the stiffer spring for the street? Since the strut isn't valved for the stiffer rate, wouldn't that make it bouncy and unstable?
Oh no, I didn't say the GT4 is better than a 991.2 GT3 at all. The 9k RPM bespoke motor, wide body, and crazy torque - C'mon LOL. What I said what the stock GT4 sounds better than a stock GT3, exhaust sound and not engine valve train sound. I said the GT3 is better than the GT4 in my opinion, but it's not $80k better.
I like manual and PDK equally.
Also, it's disappointing the Porsche didn't put stronger 3rd gear on the GT4. After 78 reported cases on RL alone, you would think they'll recall the issue and replace it with stronger parts.
Oh no, I didn't say the GT4 is better than a 991.2 GT3 at all. The 9k RPM bespoke motor, wide body, and crazy torque - C'mon LOL. What I said what the stock GT4 sounds better than a stock GT3, exhaust sound and not engine valve train sound. I said the GT3 is better than the GT4 in my opinion, but it's not $80k better.
I like manual and PDK equally.
Also, it's disappointing the Porsche didn't put stronger 3rd gear on the GT4. After 78 reported cases on RL alone, you would think they'll recall the issue and replace it with stronger parts.
06-09-2018, 09:25 PM
#24
Three Wheelin'
Congrats on the new GT4! Totally agree on the GT4 winning the fun/$ ratio over the GT3. There is so much more performance than can be used on public roads in either car that I really value the light feeling and mid-engine handling of the GT4 that you can appreciate all the time over the added grip, power, and capability you get with the GT3 which at least where I live I would rarely get to enjoy.
As for the transmission, I see it more as a lottery, a bad one, than an inevitability since it seems to be related to a batch of bad transmissions and build dates. As there's nothing you can do about it and no way to tell if you have a potentially bad one, you might as well just enjoy the car and not worry about it. I have a 9/15 build with over 15k miles, over 5k with over 460hp on the stock tranny, and things have been solid but if 3rd goes that'll be a great opportunity to go to a shorter gear stack
As for the transmission, I see it more as a lottery, a bad one, than an inevitability since it seems to be related to a batch of bad transmissions and build dates. As there's nothing you can do about it and no way to tell if you have a potentially bad one, you might as well just enjoy the car and not worry about it. I have a 9/15 build with over 15k miles, over 5k with over 460hp on the stock tranny, and things have been solid but if 3rd goes that'll be a great opportunity to go to a shorter gear stack
06-09-2018, 10:46 PM
#25
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Welcome Jimmy & thanks for your review & thoughts on the car.
Your comments make me feel a little less hard done by, for not getting a .2 GT3 allocation in MT. Having had high power 911 turbos in the past & being fairly comfortable with the 911 chassis, I was somewhat apprehensive getting the GT4. Now that I've had one for a while, I'm so happy with the car.
With the mid engine configuration, It's such a fun car to drive (really is go cart like), and the sense of control with high speed & cornering is just awesome.
With a couple friends who own GT3's & having a sense of these cars, another thing I really love about the car is the smaller cabin.
It's great that the Rennlist community has really discussed extensively, how the car can be even further improved. Thanks everyone!!!
Your comments make me feel a little less hard done by, for not getting a .2 GT3 allocation in MT. Having had high power 911 turbos in the past & being fairly comfortable with the 911 chassis, I was somewhat apprehensive getting the GT4. Now that I've had one for a while, I'm so happy with the car.
With the mid engine configuration, It's such a fun car to drive (really is go cart like), and the sense of control with high speed & cornering is just awesome.
With a couple friends who own GT3's & having a sense of these cars, another thing I really love about the car is the smaller cabin.
It's great that the Rennlist community has really discussed extensively, how the car can be even further improved. Thanks everyone!!!
06-10-2018, 03:41 AM
#26
Regarding the transmission, mine went (at around 5000kms, car now has 10000kms) and was replaced in about about a week with a loaner provided (fun little Macan which was quite "used" when I gave it back). You can still drive the car OK with 3rd gone so it's not as if you're stuck. There have been zero failures I know of with the replacement box and you get a brand new LSD to boot so not so bad really. Given Porsche just the replace the box no questions asked regardless of mods you may have made I don't see the issue. If they did a recall you'd get about the same level of disruption and reality is most the tranys will last the life of the car; its a failure of the friction weld on the shaft and its the same type of gear fixation used since the 993 in Getrag boxes.
06-10-2018, 06:02 PM
#27
Three Wheelin'
Regarding the transmission, mine went (at around 5000kms, car now has 10000kms) and was replaced in about about a week with a loaner provided (fun little Macan which was quite "used" when I gave it back). You can still drive the car OK with 3rd gone so it's not as if you're stuck. There have been zero failures I know of with the replacement box and you get a brand new LSD to boot so not so bad really. Given Porsche just the replace the box no questions asked regardless of mods you may have made I don't see the issue. If they did a recall you'd get about the same level of disruption and reality is most the tranys will last the life of the car; its a failure of the friction weld on the shaft and its the same type of gear fixation used since the 993 in Getrag boxes.
^^can you expound further on this?
06-10-2018, 08:06 PM
#28
I was under the impression that the 981 trans had a spline on third then went to a fusion weld? At least that's what the forum members that are supposed to be familiar with the 981 gearbox say?? Not true? Same weld as used for the 993 that goes back to 95? I had a 993 TT tracked the sh-t out of it and no gearbox issues 400ft lb ? carl
06-10-2018, 11:39 PM
#29
I'm sure GT Gears could expand but that that's as I understand it. I think a friction weld is where the shaft is cooled in liquid N and the gear heated and then cooled so it's an interference fit and if the heating or cooling or machining is just off a bit then the weld can fail. I think the upgraded gears from GT Gears may have spline but 993 boxes for sure used fusion/friction welds.
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ackrepps (08-13-2023)
06-10-2018, 11:54 PM
#30
Pro
Thread Starter
Congrats on the new GT4! Totally agree on the GT4 winning the fun/$ ratio over the GT3. There is so much more performance than can be used on public roads in either car that I really value the light feeling and mid-engine handling of the GT4 that you can appreciate all the time over the added grip, power, and capability you get with the GT3 which at least where I live I would rarely get to enjoy.
As for the transmission, I see it more as a lottery, a bad one, than an inevitability since it seems to be related to a batch of bad transmissions and build dates. As there's nothing you can do about it and no way to tell if you have a potentially bad one, you might as well just enjoy the car and not worry about it. I have a 9/15 build with over 15k miles, over 5k with over 460hp on the stock tranny, and things have been solid but if 3rd goes that'll be a great opportunity to go to a shorter gear stack
As for the transmission, I see it more as a lottery, a bad one, than an inevitability since it seems to be related to a batch of bad transmissions and build dates. As there's nothing you can do about it and no way to tell if you have a potentially bad one, you might as well just enjoy the car and not worry about it. I have a 9/15 build with over 15k miles, over 5k with over 460hp on the stock tranny, and things have been solid but if 3rd goes that'll be a great opportunity to go to a shorter gear stack
Regarding the transmission, mine went (at around 5000kms, car now has 10000kms) and was replaced in about about a week with a loaner provided (fun little Macan which was quite "used" when I gave it back). You can still drive the car OK with 3rd gone so it's not as if you're stuck. There have been zero failures I know of with the replacement box and you get a brand new LSD to boot so not so bad really. Given Porsche just the replace the box no questions asked regardless of mods you may have made I don't see the issue. If they did a recall you'd get about the same level of disruption and reality is most the tranys will last the life of the car; its a failure of the friction weld on the shaft and its the same type of gear fixation used since the 993 in Getrag boxes.
Do I get new clutch and flywheel?