Are these two tuners fairly close with HP and Torque gains? Is one better than another as far as warranty concerns? Can they get a SL65 up over 700 HP without taking the engine apart? Does one's exhaust sound better than the others?
Appreciate any info.
Thanks,

 

You can't really go wrong with either one. Both are fairly comparable. I prefer Renntech. Their products seem to be slightly more aggressive to me from my experience. But when it comes down to it on the sl65...your car would be a monster with either of their products. Warranty issues just comes down to your dealer most of the time...but you shouldn't have an issue.

 

I would go with Renntech as well. There is plenty of real world data with the Renntech stuff that shows you the gains and the fastest 65's at the tracks are Renntech. Haven't seen any real data from a Kleeman 65 or track numbers.

 

To get to 700HP is fairly simple.

Renntech does offer TCU upgrade which no one else does.

Software, intercooler cooling upgrade and air box will get you very close without digging into the engine.

If you want to go beyong, ported heads and turbos, along with larger intercoolers and heat exchangers will get you over 800HP.

 

Although i am not a SL65 expert, i have seen and learned a few thing about this car.

The weak parts in this car is the drivetrain. The Gearbox is rated for a 1000 Nm, and it is generally accepted that it is not advisebul to exeed 1100 Nm. So even if the engine is cranking out 700 Hp. the torque is limited to 1100 Nm. ( the engine is capebul of 1365 Nm or somthing like that, at 715 Hp.)

The backside of this tuning is that the car is very hard to control, as you constantly are smoking your tires, even with LSD, also in the higher gears, if you try to use all this Torque. You will have the ESP flashing all the time.

I remember having seen a testdrive with the Brabus SL65, ( 715HP. 1100 Nm)
and it was nothing but wheelspin.

As a comparison, my 55 is hard to control, if the road is wet and the ESP is turned off.

 

One other question though. I understand about the gearbox being rated for only so much torque but when RENNtech or Kleeman do a TCU upgrade does that help the situation?
Thanks Again

 

TCU helps with shifting and prolong gearboxes life.

Transmission can also be upgraded with stronger components.

 

Kleemann exagerates their claims,Renntech is more realistic in their gains.
I had better reliability record with the latter,many problems with the former(cracking headers in 55,misfiring because of ECU in 65,LSD problems in SL).
Needless to say,next car will be done with Renntech...

 

Hi,
May I ask what problems you had with the Kleeman LSD unit? I'm just thinking of that myself, since there doesn't seem to be anybody in the Chicago area who has installed the Quaif unit in SL's.

Thanks,
David

 

Had no problems with LSD in S600,SL65's had to be taken out (Techs at Knauz found burnt oil in it) and sent back to Kleemann.
I'm not satisfied with the way it "locks",I suspect it's the reason car is unstable at accelleration.
Would not do it again....

 

The torque limiter is not removed on the 65 engines, any crazy torque numbers above 1200 Nm will definitely fry the gearbox.

Evotech & Renntech increases the torque from 1000 Nm to 1200 Nm, nothing more than 1200 Nm.

 

[quote=AdamG@EuroElites;2370232]The torque limiter is not removed on the 65 engines, any crazy torque numbers above 1200 Nm will definitely fry the gearbox.

Evotech & Renntech increases the torque from 1000 Nm to 1200 Nm, nothing more than 1200 Nm.[/quote]

You are not afraid, over there, not a bit, are you. 1200 Nm, Uuh.

To my knowledge, the leading European tuners have taken back to aproxx 1100 Nm, because of too many incidents with Transmission damage.

 

Vadim mentioned that Renntech can strengthen a 65's gearbox to handle the torque better, so if they do that then how high can the torque go?


How many 800+ Horsepower 65's are there out there?

 

i think sunil is from chi town. he has done quafies, i would look him up he is a sponcer here.

 

Although both are reputable companies, I would still go with RennTech. From what I've seen on this board as well as other boards, RennTech has tuned a lot more 65 engines than Kleemann did. Also, RennTech's numbers are more realistic as opposed to Kleemann's.

Good luck, your car will be a SUPER beast after this....

 

Year, lets get to know some more about this gearbox reinforcement.
That sounds like an interresting topic.

What is the max possible torque ??

How can the electronic help prevent gearbox failure ??

Is it possible to change the ratio of the gears ??

Can the shifting point ( motor rev.) be altered.

 

Gearbox strengthening s something Adam and Vadim will need to expand upon as most, including me, are not exactly sure exactly what this entails. 800bhp and 1000lb/ft is what all of us owners want, but guarantees that our machines will not melt to the ground is what we need.

I'm just thinking now of the potential trap speed of our 4-door limo with such power, LSD and 305rears allied to lightweight 18s. Would likely cause many at the strip to faint.

On the issue of tires, how wide can we go at the rear? I'm OEM right now

 

You guys could have your fenders widened so that you could put those huge 345/30/ZR-20's or 335/30/ZR-18's on there if you want a lot smoother ride. With over 1,000 lb/ft of torque, you will need atleast these size tires.

 

Interesting. Had never thought of that. Is that a lot of work? Would they look flared like on the new model? That may look a little overwrought on the W220. What's the biggest without bodywork?

18s are the way fwd if I change the beautiful 19s as they'll get me up the strip quicker than 20s. All go and no show is a 65 mantra.

 

I have seen people run 305/25/20 on a 20x11 rear.

 

Like any automatic gearbox, MB 5-speed can be beefed up. Heavy duty clutch packs, stronger band and tighter clearances can add TQ capacity.

I am also looking into shifting TQ up, not only to gain HP, but also to reduce wheelspin.

I am putting together several stages to go above what Kleemann and Renntech offer.

Stay Tuned.