E-SICKTY3

Well.. I think this is merely based on customer preference which one you are comfortable to go with and other factors that will affect your decision as a customer; like the price (how much you are willing to spend), customer service, reviews about them, etc. However, I think Renntech and Weistec are pretty competitive and they both are good. I'm currently satisfied going with Weistec. Now, I can feel the tremendous amount of power and torque from the M157 -- I just need to have it on a dyno.

emericr

Karl: you are correct. Now that Renntech has a solid reputation and web of dealers, he cannot charge less UNLESS .... he would run a sale like once a year or after a few years. MB does it when they throw trunk money.
He would get "cheap" people like me on his bandwagon. $2,000 is better than none if you know what I mean.
They have a very impressive shop (youtube video) and I will eventually go see them when I come see you

Karl901

Emericr, my CLS 63 has to much power for the drag strip anyway. Last time I ran 13.87 sec 1/4 at 127 mph. I will catch up to you soon.

emericr

I think you meant 10.87

Karl901

No that time is correct, there is not enough tire (305 PSS) to hook up.
I was going sideways and let off the throttle and then took off.
The car would do around 135 mph 1/4 mi with DR on it.

Vic55

Karl you need a better LSD if you are running the stock one too... its only a 30% lock up right?? Are you running an upgraded one?

vdubpower

with the lsd, stock or aftermarket, is the way it works, it will prevent wheelspin , correct? And provide as much traction as possible

im just wondering now that i have been driving my car with esp off completely more often, how much wheelspin the stock lsd would have even prevented in a car witth so much HP anyways

vic, just noticed your sig....another P car, nice....did i miss the pics somewhere

Karl901

The car is at approx 800 rw TQ. The whole drive train has been upgrade, trany, 100% LSD, larger rear axles etc. Drag radials will work, but the transmission I think will not hold up. I just leave it in Sport mode and get to the speed limits very quickly!

vdubpower

as awesome as it is, seems kinda pointless if its undriveable

AMG-Driver

At higher speeds, the bigger Turbos will give the most benefits!

Karl901

It is a daily driver, and very drivable, and a blast to drive.
Tell me you drive around town with your traction control off, doing burnouts all daylong, then that would be true.

hyperion667

my **** is smaller than your ****

E-SICKTY3

Wow, your car should be FASTTTTT.. Mine wheelspins almost through 3rd gear from a dig on stock LSD after the tune. I wonder how your car drives, it's like adding another 100hp to my car.

Polivoks

Definitely check out AMS. I've had their tune on my car for over a year, no issues, very happy.

mohammed_b63

will175

Whats up Bud..This is Willis from the GTR side. Im going to get AMS tune as well. Still waiting for the rest of the bolt ons they got coming.

Ali_E55

I have more TQ than that to the wheel , I know how you are suffering

seanthebomb

First and foremost I apologize if my message has grammatical errors, very hard to spell check via iPhone however please read the following --> below 🔽
▶️▶️▶️▶️Hey I noticed you were looking at tuners, and thought if you're interested let you know a little bit about my experiance and 3 of my friends from weistec. We are in SoCal, and after going for a tune on the 2013 E63pp w/LSD l I picked up new in march of 13, I waited till October to go to weistec After breaking in the motor. At first I was impressed that they showed me the facility and were eager for the buisness. After several weeks of deciding between renntech or weistec, I opted for weistec b/c of price and locality. In all honesty I went in around my birthday in oct of 13 and to this day I have not received the work I paid for and have been treated poorly. The odd thing is that, besides that issue; the more crucial issue was the knocking noise that came after I did a full tune by weistec. Then taking the car to mb and had my friend who's a certified mb mechanic look to see the problem, and the issue became known that the "real down pipes" were infact not bolted on tight enough, and the engine mounts were issue b/c of the poor installation. I immediately went to weistec to Adress the issues but the answer I'd get was "Steve was busy, or out of town". I have had all ten of my last amg's modified. Before weistec existed I worked with Evosport and kleeman. Never used renntech or thought about them till after my buddy had the ecu tune only on his 2012 E63 pp. I have the 13 pp and both of us often for the LSD through amg. So to say the least with the down pipes and ecu and all other goodies, off the dig he would take me, and he was on ca91 I was running a mix of 101 with 91 to avg 96 and the only time I could start to pull on my buddies car was in 3rd then the power fell off and pretty much his tune for 3500 was beating the amount I spent which was more then 2 times what he paid. Now I'm not going on ranting about weistec, however, the messages I received from the owner and the disrespect( which I can post for you members and fellow enthusiasts to see, is appalling in the least ), and continuous false promises don't even bother me that much. However, the main issue is the poor quality of installation which has crippled my 13 E63. Thankfully I just ordered a 2015
e63 type S fully loaded and now I know which tuner to take my car too. To be honest, after my experiance and in my opinion renntech is like amg you pay for what you get-(the owner was on the team that designed the clk-gtr) . In contrast Weistec is probably similar to a ford. Now there are more facts ( too neg to mention about weistec) but I do think due diligence is required when you spend atleast a 100k on a car, you don't slap some knock Brabus wheels bc they r cheaper and "almost as good" or you pay the price for the Brabus wheels bc they are the authentic thing. I repeat I'm not disrespecting any followers or weistec customers, but from first hand experiance they are very unprofessional and I don't want to put up the thread of messaging I received from the owner, now I just want my fellow comrades in the forum to be very selective on who you opt for. Oh and the story doesn't end, do you remember when Evosport didn't come through on parts ppl paid for? Well weistec is in a similar situation. I paid up front for parts and install almost 8 months ago, I calked a 100 times to get lies after lies, and showed up to the store and wasted 50 hours total trying to wait for Steve. Bottom line is this how you want your amg to run? I had an issue immediately the day after I received my car with the ecu bc he forgot to program it to adjust for the downpoows exhaust etc. so my point is if I was in let's say another state I would be screwed even worse.

JumpinJim

Renntech isn't faultless either. A buddy of mine got a renntech tune and they bricked his ECU.

seanthebomb

↕️I agree no tuner is perfect, but the mere fact that weistec has been so aloof from resolving the unfinished work, is a sign of lacking professionalism in such a niche market. I'm not trying to put favoritism for renntech, I also think AMS does great work, but because of my experiance and others I know of, I'm just trying to look out for others on the forum who plan on using a tuner. I know there are ppl here who are sensitive about their tuners and that's why I only speak on what I've dealt with as well as my friends. We are all here for exchange ideas and experiances so that in the future others who decide to modify their cars can know the truth. Did your friend get his ecu replaced after they broke it?

seanthebomb

Did renntech replace the ecu they broke? Or did they ignore your buddy?

JumpinJim

No. Thankfully the dealership didn't look very hard when he had the car towed in and they replaced the ecu under warranty.

vdubpower

its amazing how these tuners get such rave reviews from some and poor from others......theres no consistency with the product put out it seems.......

will175

I kept blowing my plugs on Weistec tune..And continues to throw 02 sensor codes. I need to get them the exact code so they can tell me whats going on. I think they just forgot to turn off the secondary 02 sensors. And I finally pulled the trigger on the Weistec plugs hoping it would stop burning through plugs.

Myself and a few other tuners believe the tune is a little too aggressive, and that is the reason it keeps burning through plugs. Im waiting for the 2015 CLS63 and will go with AMS. Have had a ton of parts from them including 2 fully built engine (3.8 and 4.0). Eric over there has amazing customer service. Weistec could take some notes..

Oh and my neighbor has a Renntech tuned CLS63 with the same mods on stock plugs and he has never had problems...Just my opinion.

E-SICKTY3

Just speaking out of my experience here with both tuners. As discussed previously on another thread the problems I had with Weistec (check thread for more info), decided to go with Renntech after and the result was phenomenal. No issues at all -- used the stock spark plugs and I ran way faster at Shift Sector too. Just my experience from both.