Drewsky00

I called Eurocharged earlier this week to inquire about their Stage 1 tune for a 2019 E63 S which their website lists for $2,499 and was told that ordering that would require that I also get the CPC Tune, which encompasses a module replacement and costs an additional $1,999. So it seems that to tune my car, I would be out the door at $4,498. Looking on RennTech's website their ECU tune with a handheld tuner costs $3,480 and doesn't mention anything about a CPC module replacement requirement. Do any of you know if a RennTech Stage 1 tune for a w213 can in fact be done simply by plugging that HHT to the OBDC connector or would I also need to replace my CPC module first?

Cylinder Head

iTrader: (1)

To my understanding, you need a CPC tune to really unlock the car's power in the first few gears but I don't see why it's necessary for Stage 1.

Drewsky00

The way Eurocharged explained it to me, it seems like the CPC module has a torque limiter that would basically block any gains provided by a Stage 1 tune and keep the car from performing beyond the factory torque numbers.

kponti

What they are saying seems accurate, however a stage one should net you some added umph without needing the CPC changed. Though from what I have seen on this forum, it will feel faster but not actually be faster (you wont go any faster than stock, just feel like it is)

I am wondering, does that mean you also need the TCU tuned? Is the TCU tune required for the CPC tune?

Cylinder Head

iTrader: (1)

If that was entirely true tuners would not have been getting better quarter mile results from Stage 1 cars before the CPC tuning was even a thing. E63's were running 10.6's as opposed to 11.1 or 11.2.

Drewsky00

That's great to know, thanks @Cylinder Head

nw66

You can have just a tune but you wont get the full benefit without a cpc/tcu, i have had just a ecu map and now have a weistec cpc/tcu also, massive difference and you also get the limiter removed to vmax with the cpc unlocked

WildWolf

What does the 1/4 mile time drop to with the CPC/TCU and ECU tune? what do these things trap at?

also, can the dealer tell what date the car is actually tuned and tuned back to stock or can they just tell the ecu was flashed a number of times?

kponti

What he asked!! I hear a lot of talk about these TCU and CPC tunes but no numbers to back it up so far (except in the W212)

apsuard

I ran 10.6 (and I think even a few 10.5,s) with stage 2 ECU tune. CPC netted me about 3 mph in 1/4 mile and 0.2. Without CPC I was consistently 10.6-10.7 at 129-130 mph. With CPC I was in the 10.4-10.5 range at 131-133. My opinion is that the CPC isn’t that big of a deal when you have stock turbos. Personally I would only do CPC if upgrading turbos.

I sold my car so not as active but can post dragy results if you guys want real world data.

nw66

they do make a big difference in my opinion biggest one for me is the limiter removal to vmax, i have done a back to back with and without and the extra torque in the lower gears is massively improved. yesterday hammered a GTS he was gutted

kponti

I would love to see it if its not too much trouble. Also you had CPC tune, did you have the tcu tuned as well?

Drewsky00

This right here is kinda the advice i was looking for. Thank you, @apsuard !!

apsuard

Only ECU and CPC. I was going to do upgraded turbos and TCU but sold the car in February

buganim

You don’t need CPC if you are only doing stage 1 (tune only). Its strange that they are saying you need a cpc, maybe they just want to sell. If you are doing stage 2 (downpipes) then yeah CPC is needed because you will be reaching the torque limit in the factory cpc, but not with stage 1.

And I disagree with who’s saying stage 1 is very similar to stock. Buddy with stage 1 your car will fly there will be huge difference in numbers and feeling, you’ll remember what I’m saying when you tune yours.
just a real time example:
stock E63s usually doing 7.8-8.0 seconds from 100-200 kmh.
tuned E63s usually doing 6.7-6.9 seconds from 100-200 kmh

Btw 6.7 seconds this is AMG GTR - Lamborghini huracan level of acceleration.

so imagine the difference in performance. All the best

nw66

CPC TCU does make a difference who ever you buy from, what have you had done to your 63? if you had a CPC/TCU with stage 1 or 2 you'd 100% gain! ive done a standard cpc and an unlocked one back to back and there is a massive increase in toque! also if your happy with 155mph or 186mph good luck to you! if you ever go to the ring and autobahn you'll be pissed you didn't get done! these are fast cars standard unleash the locked in power they are a ****ing beast **** the supercars

TugboatBill

??? a CPC/TCU with stage 1 or 2 will give you 1200HP? really?

SEXYBEAST

whatch ya buyin next?

nw66

**** me whos claiming that??

TugboatBill

Some joker in post 16.

Cylinder Head

iTrader: (1)

That's not what he said at all.

nw66

youve lost me fella 🤷‍♂️

nw66

100% means definitely you will gain not double it you div

Skilly

I dont know if that is correct - the HHT that RENNtech sells moves both HP and torque up a lot and its dyno verified; no CPC requirement.

apsuard

I just got my 2021 M5 Competition delivered last week. I usually don't buy new but I felt the LCI upgrade looked so much better I decided to buck up. After one day of ownership I had HRE P101's installed, lowered on KW HAS kit, and some iND cosmetic stuff done. In the next couple of weeks I will get my Eisenmann Race exhaust installed, catless downpipes, and a JB4. 2021 ECU's are locked so I'm stuck with a JB4 until they crack them. I'm hearing they are nowhere close so I might have a long wait. Crazy part is that a buddy ran a 10.8 with his 2021 M5 stock and is running 10.3 with JB4 only (91 + 4 gallons of E85). These 2020/2021 M5s are really fast stock.

I plan on doing a bunch of testing after I get the 1200 mile service done. I will pull out my dragy and test stock, JB4 + OEM downpipes, JB4 + catless, and with a bunch of different fuel mixtures to see what works the best. I'm hoping to crack into the 10.3 range this year with JB4+downpipes and hopefully can get a 9.9 next year after tuning is available. If someone with crappy 91 octane can run 10.3 with a little E85 I should easily beat that because we have Shell 93, unleaded 102, and E85 right next to my house.