Tuned 991.2 PDK Redline Shift Bounce/Flutter- MASTER THREAD
08-15-2019, 08:42 AM
#32
Three Wheelin'
Thread Starter
Ok, a follow up for those who are interested.
The car was re-tuned. The car no longer exhibits the 3-4 flutter issue. The issue has to do with a myriad of factors like boost, timing, AF ratio, etc.
It takes that special mix to get a tune to exhibit the shift problem. I would say 95% will never have this problem and to replicate it is difficult.
So, the solution really is just to re tune the car. You have a 95% chance that the new tune will eliminate the problem.
Cobb is re releasing their OTS maps with reduced boost and other factors to completely eliminate this from happening.
I'm not a real fan of the solution, but it will eliminate this issue 100% on all OTS maps, so you get less gains but zero problems.
If you want to get the most out of your car a Pro Tune is really the way to go. They take a stock MAP and customize it to your specific car and components.
For me, the new tune actually picked up 25hp and torque. The car is now around 483hp to the wheels from 458hp previously.
On the dyno, the car actually started to hop or bounce from all of the torque/hp which was kind of scary but, this dyno is one that ties down on front and rear and not down.
I did some runs this morning and I did Dragy it. The car ran nearly identical to the old tune (maybe a hair slower) but no misshifts.
Still trying to figure out how adding 25hp/torque isnt translating to a faster car, but maybe it needs some time to adapt.
In any case, the car not mis shifting is the best scenario for me. Problem solved.
PS: My tuner did NOT dial down the boost. He changed some timing and other tweaks, We are running 28lb boost, which is as high as the last tune.
Anyone interested in using him, he is a traveling tuner and travels the world tuning any and all cars.
Shout out to Mike Botti
Instagram stimikey
The car was re-tuned. The car no longer exhibits the 3-4 flutter issue. The issue has to do with a myriad of factors like boost, timing, AF ratio, etc.
It takes that special mix to get a tune to exhibit the shift problem. I would say 95% will never have this problem and to replicate it is difficult.
So, the solution really is just to re tune the car. You have a 95% chance that the new tune will eliminate the problem.
Cobb is re releasing their OTS maps with reduced boost and other factors to completely eliminate this from happening.
I'm not a real fan of the solution, but it will eliminate this issue 100% on all OTS maps, so you get less gains but zero problems.
If you want to get the most out of your car a Pro Tune is really the way to go. They take a stock MAP and customize it to your specific car and components.
For me, the new tune actually picked up 25hp and torque. The car is now around 483hp to the wheels from 458hp previously.
On the dyno, the car actually started to hop or bounce from all of the torque/hp which was kind of scary but, this dyno is one that ties down on front and rear and not down.
I did some runs this morning and I did Dragy it. The car ran nearly identical to the old tune (maybe a hair slower) but no misshifts.
Still trying to figure out how adding 25hp/torque isnt translating to a faster car, but maybe it needs some time to adapt.
In any case, the car not mis shifting is the best scenario for me. Problem solved.
PS: My tuner did NOT dial down the boost. He changed some timing and other tweaks, We are running 28lb boost, which is as high as the last tune.
Anyone interested in using him, he is a traveling tuner and travels the world tuning any and all cars.
Shout out to Mike Botti
Instagram stimikey
08-15-2019, 09:13 AM
#33
Rennlist Member
PTS im excited you got it fixed!!! Re: being “slower” its probably because youre not spending 2 seconds at redline in 3rd gear 
08-15-2019, 10:51 AM
#34
I did some runs this morning and I did Dragy it. The car ran nearly identical to the old tune (maybe a hair slower) but no misshifts.
Still trying to figure out how adding 25hp/torque isnt translating to a faster car, but maybe it needs some time to adapt.
In any case, the car not mis shifting is the best scenario for me. Problem solved.
Shout out to Mike Botti
Instagram stimikey
Still trying to figure out how adding 25hp/torque isnt translating to a faster car, but maybe it needs some time to adapt.
In any case, the car not mis shifting is the best scenario for me. Problem solved.
Shout out to Mike Botti
Instagram stimikey
Why is the car no faster despite increased peak numbers? Area under the curve.
08-15-2019, 10:54 AM
#35
Rennlist Member
Check the DA between runs also. And if you ran a bunch of times before dragy it couldve been heat soaked
08-15-2019, 09:06 PM
#36
Three Wheelin'
Thread Starter
I do not know why the car isnt noticeably faster. I am going to test it on a different dyno where it cant hop, to get more accurate numbers.
Regardless, its plenty fast. I looked at the leaderboard on Dragy and my car is right up there with the Turbo S models, so Im ok with were I am now
Regardless, its plenty fast. I looked at the leaderboard on Dragy and my car is right up there with the Turbo S models, so Im ok with were I am now
08-16-2019, 01:08 AM
#37
Rennlist Member
Id take the new calibration without pdk misbehavior ANY day regardless of small power differences. If that was my car bouncing off the limiter all over the place id be spooked as hell. Like the tranny was trying to save itself. Im glad u got it fixed just enjoy the buttery smooth pdk
08-16-2019, 03:51 AM
#39
Rennlist Member
Ok, a follow up for those who are interested.
The car was re-tuned. The car no longer exhibits the 3-4 flutter issue. The issue has to do with a myriad of factors like boost, timing, AF ratio, etc.
It takes that special mix to get a tune to exhibit the shift problem. I would say 95% will never have this problem and to replicate it is difficult.
So, the solution really is just to re tune the car. You have a 95% chance that the new tune will eliminate the problem.
Cobb is re releasing their OTS maps with reduced boost and other factors to completely eliminate this from happening.
I'm not a real fan of the solution, but it will eliminate this issue 100% on all OTS maps, so you get less gains but zero problems.
If you want to get the most out of your car a Pro Tune is really the way to go. They take a stock MAP and customize it to your specific car and components.
For me, the new tune actually picked up 25hp and torque. The car is now around 483hp to the wheels from 458hp previously.
On the dyno, the car actually started to hop or bounce from all of the torque/hp which was kind of scary but, this dyno is one that ties down on front and rear and not down.
I did some runs this morning and I did Dragy it. The car ran nearly identical to the old tune (maybe a hair slower) but no misshifts.
Still trying to figure out how adding 25hp/torque isnt translating to a faster car, but maybe it needs some time to adapt.
In any case, the car not mis shifting is the best scenario for me. Problem solved.
PS: My tuner did NOT dial down the boost. He changed some timing and other tweaks, We are running 28lb boost, which is as high as the last tune.
Anyone interested in using him, he is a traveling tuner and travels the world tuning any and all cars.
Shout out to Mike Botti
Instagram stimikey
The car was re-tuned. The car no longer exhibits the 3-4 flutter issue. The issue has to do with a myriad of factors like boost, timing, AF ratio, etc.
It takes that special mix to get a tune to exhibit the shift problem. I would say 95% will never have this problem and to replicate it is difficult.
So, the solution really is just to re tune the car. You have a 95% chance that the new tune will eliminate the problem.
Cobb is re releasing their OTS maps with reduced boost and other factors to completely eliminate this from happening.
I'm not a real fan of the solution, but it will eliminate this issue 100% on all OTS maps, so you get less gains but zero problems.
If you want to get the most out of your car a Pro Tune is really the way to go. They take a stock MAP and customize it to your specific car and components.
For me, the new tune actually picked up 25hp and torque. The car is now around 483hp to the wheels from 458hp previously.
On the dyno, the car actually started to hop or bounce from all of the torque/hp which was kind of scary but, this dyno is one that ties down on front and rear and not down.
I did some runs this morning and I did Dragy it. The car ran nearly identical to the old tune (maybe a hair slower) but no misshifts.
Still trying to figure out how adding 25hp/torque isnt translating to a faster car, but maybe it needs some time to adapt.
In any case, the car not mis shifting is the best scenario for me. Problem solved.
PS: My tuner did NOT dial down the boost. He changed some timing and other tweaks, We are running 28lb boost, which is as high as the last tune.
Anyone interested in using him, he is a traveling tuner and travels the world tuning any and all cars.
Shout out to Mike Botti
Instagram stimikey
08-16-2019, 09:45 AM
#40
Three Wheelin'
Thread Starter
RENN "Id take the new calibration without pdk misbehavior ANY day regardless of small power differences"
So, would I but the strange thing is that the car tuned stronger the second time around and produced more hp/tq.
I am not complaining about the car being incrementally slower, I am curious how it could pump out higher numbers and still be slower.
Again, the car was hopping on the dyno, I should ask the tuner for the graph to show the bumps on the chart.
I am going to do a run on a different dyno and publish the results. Hard to get an accurate reading when car is bouncing.
So, would I but the strange thing is that the car tuned stronger the second time around and produced more hp/tq.
I am not complaining about the car being incrementally slower, I am curious how it could pump out higher numbers and still be slower.
Again, the car was hopping on the dyno, I should ask the tuner for the graph to show the bumps on the chart.
I am going to do a run on a different dyno and publish the results. Hard to get an accurate reading when car is bouncing.
08-16-2019, 03:17 PM
#43
Mike botti is well known in the Subaru tuning world. He's good.
08-16-2019, 11:22 PM
#44
Rennlist Member
"For me, the new tune actually picked up 25hp and torque. The car is now around 483hp to the wheels from 458hp previously.
On the dyno, the car actually started to hop or bounce from all of the torque/hp which was kind of scary but, this dyno is one that ties down on front and rear and not down"
PTS, is this the same dyno you originally used to get 458hp? With your fast Dragy times, that seems really low. I would guess any other dyno is going to read higher than that one.
On the dyno, the car actually started to hop or bounce from all of the torque/hp which was kind of scary but, this dyno is one that ties down on front and rear and not down"
PTS, is this the same dyno you originally used to get 458hp? With your fast Dragy times, that seems really low. I would guess any other dyno is going to read higher than that one.
08-17-2019, 09:50 AM
#45
Three Wheelin'
Thread Starter
I have used this dyno and one other. It is well known to be the absolute lowest reading dyno in the area and the owner is aware of it.
This is the same dyno that was reading 458, it is now reading 476hp with the hop.
I do believe it is producing more than the dyno is reading, which is why I am going to do a run on a 3rd dyno to see if I can get a cleaner reading.
Car is running very strong and is very close to the previous Dragy numbers and no longer has any bounce or flutter so its a win for me
This is the same dyno that was reading 458, it is now reading 476hp with the hop.
I do believe it is producing more than the dyno is reading, which is why I am going to do a run on a 3rd dyno to see if I can get a cleaner reading.
Car is running very strong and is very close to the previous Dragy numbers and no longer has any bounce or flutter so its a win for me