Asher4799

No if your going big power your going to need the upgraded clutch packs. The higher stall speed on the converter helps but it's really the trans kit that you will benefit from.

PianoProdigy

Gotcha, I guess that's ignorance on my part about how the transmission works. I sent Weistec an e-mail too.

Asher4799

The v2 trans pack has been great for me so far I would just get that and have a local transmission shop do the build it will save money there is no need to pay the shipping to Weistec when you can have a quick turnaround locally

Merc63

My updated v2 is running good, shifting nice and hard.

BLKROKT

Does anyone know why they stopped offering the VB/TCU upgrade as a stand-alone? I'm pretty happy with mine, shifts fast and hard, but I wonder if there's some sort of issue related to reliability or longevity/wear of components? Mine runs the car materially hotter too. Anyone have any views on this?

marioflex

I have the V2 and TCU upgrade and the diference is night and day. Before the upgrade It was very dificult to shift at high revs.

Asher4799

I asked them when I ordered the parts and Zach said they are finding it to be redundant and it's not really needed with the v2 and as far as I can tell it doesn't need the shifting to be any quicker as for the original v1 package from their explaination that's where the TCU and valve body tune helped more but I can't speak from experience on that end.

dubzAMG

Maybe they don't offer it anymore because Steve the tuner isn't with Weistec.

Phil Chow

So, Wesitec no longer offers the VB/TCU for the 7G Pre-MCTs anymore?

Weistec

We have not exactly stopped upgrading the TCU/Valve bodies. We are still upgrading them as part of our bulletproof transmission upgrade.

The reason we have temporarily stopped offering the upgrade on its own is that many of them were arriving at our facility with damage from shipping and in most cases, the damage renders the part unusable.

Mercedes classifies the 722.9 TCU/Valve body as a TRP item (theft relevant part). Because of this, the process of replacing a damaged valve body requires special paperwork as well as copies of the registered owner’s driver license and vehicle registration. The new TCU/Valve body must then be installed in the vehicle and programmed which typically is only done at a Mercedes dealer. Once that is done, the TCU/Valve body would have to be removed and shipped to us again to receive the upgrade.

The entire process results in anywhere from one to three weeks of downtime for the vehicle and a very inconvenienced customer. Aside from the downtime, the cost of replacing a TCU/Valve body can easily be higher than $2500. Simply too many of our customers were having to go through this process which is why we are currently not offering the 722.9 TCU/Valve body upgrade on its own.

BLKROKT

Thanks for your reply - I'm really happy with mine and glad I got in under the wire!

Quick question though. Is it normal for the VB/TCU upgrade to cause the car to run materially hotter on track? And if so, what's the reason?

Thanks

Weistec

Glad you are happy with the upgrade

Are you referring to transmission oil temps? The 722.9 transmissions have always run hot on a track. If so our 722.9 trans pan was made to help with that by increasing capacity and having built in cooling fins http://weistec.com/722-9-transmission-pan.html





If not, please email tech@weistec.com and we can do our best to answer all your questions

BLKROKT

I'll email you. I have your trans pan also. However my oil temps are running much higher after the upgrade - I assume the trans temp is higher and it's all getting soaked up systemwide.

Merc63

Blk, hook up two lines and a fan with cooler to the back of the car mounted under the trunk. Jrcart had one made like that, bet it would help lots.

BLKROKT

Thanks! I have the 44O cooling package on the way (backordered) so that should make a big difference too.

I think the CLK BS cars had something like that stuffed just behind the diffuser. That's what the vents in that model diffuser were for versus others for cosmetic purposes. The C63 BS cars also have something back there, but I think it's for the active rear diff cooling equipment.

roadtalontsi

yes that's correct. The rear differential cooler was installed behind the rear diffuser. It had its own separate lines, cooler and pump for only the rear diff. I dont think it had a different transcooler from any of the other cars for say, the trans temps weren't really an issue until the mct started to get used.