So I took the car out yesterday to see what she does. I did a 1/4mile pull. With a 2.2 60' time I managed to run a 11.5@130.2 However, I noticed that my car was doing 60-130 in 7.8 seconds! My car is taking 1.9 seconds to get from 110 to 120. After looking over a few other runs this happens every time. Anyone know what could be causing it or anyone with a tip know if this is an inherent issue with the tips. Will a TCU upgrade take care of this issue?

Wow. it really looks like it stops pulling in between shifts. I wonder if it's the trans or the ecu causing this anyone know?

TCU maybe will improve a little bit but i think that you will need to remake the gearbox, after the tx mile ask todd, he is the tip guru

Yeah 1.9 is about .5 longer than it should be with your setup.

Hey,

It seems to me that it was one gear that is giving you big problems? The change from 1st to 2nd and 2nd to 3rd was okay?

So I will be running similar power to you and I have just sent my gearbox to MKB in Germany to have: -
1) New clutchpacks made from Kelvar with an additional 2 in each bank
2) New solenoids - these are the pressure ones that help with shifting - I understand from research that this speeds up the shift times
3) General overall + fitting Tranny Cooler
4) I already have an upgraded Torque Converter

The gearbox will then be rated 1300nm tq. Not that I will be intending to hit that obviously, but it should ensure that I don't get any slippage.
I think there are two main issues - one is slippage and the other is the lock up times. I understand that 2) above helps considerably with lock up times.

I should have car on the road on 16th April, so I will try and post a similar data log to see what the improvement is.

Ken

does anyone in the states do the same type of upgrade as MKB?

do you want to run more that 700hp ?

I dont know of anyone like MKB here in the states so I would love to know who could help me out with this issue. I was hoping that by next summer I would be able to upgrade the motor, run GT30's, and have Tony at EPL work his magic. Anyone know if you can put a 997 turbo trans and TCU into a 996?

I am not looking for 700 hp from my car, but I would like to improve the shift times and depending on cost beef up the internals so I know I wont have any issues.

Regarding the HP, I had been quoted from 9ff for guaranteed 800bhp/900nm. However MKB came back to me with a better offer, and a bigger guarantee re hp/nm. At the end of the day MKB are specialists in upgrading MB cars, but to do that, they have had to upgrade he box, which in general for quite a few models they do, is the same gearbox.

To be clear what MKB does (and this should be able to be done by any MB specialist)
- they replace the clutches and add a bigger disc carrier for the packs, so that they can add more discs. The disc has a special surface (kelvar I think) which is used in motorsport. I understand that they increase the number of discs in the k2 bank to be 9 from 6, and in the k3 from 10-12.
- they reprogram the TCU, not for faster shifts, but to allow the additional torque up to 1300Nm. My understanding is that the standard TCU has a restriction in place re torque, and therefore it will trip pcodes if you are over this.
- they don't offer the TC upgrade because they do not upgrade the TC
- they don't fit a tranny cooler, but recommend it. I have sourced one which is electronic fan assisted - not the type that you put the radiator at the front of the car. This one monitors the temperature of the ATF, and once it hits a certain point, the fan switches on. It is plug and play, and was only around 200GBP. But ideally you need the gearbox out to fit this, which it will be.
- finally, there are two solenoids in the tiptronic switch unit (I think it bolts into the tranmission) that control the pressure regulator. I think there are actually four in total, but two of them are responsible for the pressure control in terms of shifting. In our boxes, most of us have old brown based solenoids. There has been 4 iterations of these, and the latest blue ones, improve shifting time. Have a look at the thread
https://www.6speedonline.com/forums/...e-problem.html
it also has a subthread on this.

There are also some US based shops mentioned.

The reason why I went with MKB, is because they are absolutely specialists in MB tuning, and use the MB boxes that we have in a lot of cases. You just need to find a good MB gearbox specialist who offers reinforced boxes. It is not a porsche specialist that you need on this imo, but a good MB gearbox specialist for the mechanical side.

Given I can run up to 680awhp with my set up at 1.5 bar, with transmission lost of 28% you can see that I will be running high hp. I probably will plan to run at 1.25 most of the time. I was having locking up issues at 1.1 bar which was affecting my times.

On that latter point, I did not get them for the first 20 or 30 miles with some hard runs, just afterwards. I believe that as soon as the ATF heats up, that adverserly affects the performance of the shifting.

I also know that Max in Bahrain has just had this done, and is not having issues. He has just had his car upgraded by Todd K.

I think the TCU upgrade will help improve, but only once the mechanical part has been resolved. In the end, if the pressure values are slow, no matter how good the TCU is, that will still be the bottleneck, as will any slippage with the clutch packs.

So I am leaving the TCU upgrade (other than what MKB does for the tq limit) to the last.

I won't know until the 16th April whether I am getting good results.

BTW - did you get those times in D or M mode, and have you tried both to see your times?

I am completely lost with this thread, can you help somebody who would like to learn something this morning. First, what tool did you used to come up with this graph ( two graphs ???). And what are the gray( high peak = shift???), red, blue, yellow lines. Thanks for the information....

what is the price at mkb ?

I believe the OP used a Vbox, which you can produce these graphs from. By plotting the g-force, you can see the shift changes.

Regarding cost is was about 4k Euro approx + shipping

Ok I've heard about the Pbox but of course I have to do some more search about it. I'm still using sandclock ....Thanks a lot 996ttalot.

To compare your graph to tip car. I seached and found old graph from VividTX. (60-130 6.57 sec)
https://www.6speedonline.com/forums/...4&d=1253474057
One thing I see, your dip in the shift is .3sec. But there is more than dip in your tran that effect time. Check how VividTX car pulled strong&smoth through each gear. G graph in each gear did not drop much between mid to high rpm. Your graph is kind off taper when it reach higher rpm. May be run out of air or choke somehow.