jacob502

Ok so we are talking about the same tune here for a Longtube header 63 AMG. would there be a diffrence between just loading the software on the ECU vs having the car making map changes and adjusting the exhust to exactley match the tune on the dyno?

Has anybody done this trial before?


thanks

C63newdude

There is always a few differences. The dyno tune puts a real load on the car, reads AFR directly from the wide band and fuel and timing changes can be made accordingly after reviewing the dyno results. A road tune would further more show some real IAT temp readings as you do pulls.

A mail in tune is more of generic tune, there is no AFR readings directly from the car, it is more like using an existing previuosly tune car to use it as a reference. Mail in tunes are typically oriented on the richer AFR side to give you a bit of safety cushing.

You can always use someone's dyno tuned files but it will never be exactly accurate because elevation, gasoline, weather and other factors are different. I am not expert but I have had the following cars tuned:

Eclipse GSX(tuned with DSM Link) Another one I had it tune with AEM EMS
Evos(3 of them) tuned with Dynoflash(Mail in tune), road tuned and also Dyno tune
WRX tuned with UTEC piggyback (10 years ago) later on tune by Clark(look at nasioc)
BMW 335i tuned with a first ever available piggyback (Vishnu Procede V1.4) 4.5 years ago about the same time as Terry burguer
C6 Z06 tuned with HP tuners (by two different tuners)
Porsche Carrera4 tune with Powerchip (12 years ago in the UK)
C63 mail in tune by MHP
Jetta MKV GLI tune with GIAC
Golf GTI MKV tune with APR

My .2c

SLS Qatar

can we expect a number of like 15-20rwhp?

C63newdude

^^ That would be very feasible and realistic. I am assuming that you are talking about 15-20whp increase from going from Mail in tune to dyno tune/road tune right?

SLS Qatar

Yes that is what I am talking about. So is that possible?

C63newdude

Well..yeah.. mainly you are eliminating any engine knock first, then you can typically lean the AFR by adjusting fuel trims and messing with the timing. You are also reading IDC(injector duty cycle percentage) but on our aplication you will never run out of fuel unless Supercharged.

Not always custom tuning is the best option. Here where I live we go 90 degrees temperature differences within every 6 months. I had some of my previous turbo cars tuned in the winter at high boost and had to change my tune again to safely run the car in the summers otherwise I would have tons of engine knock.

For that reason a more generic less agressive mail -in tune might be the way to go aiming for richer AFR and leaving the timing alone(stock). Just my .2c

jacob502

Thank you for that informative input. Why didn't you custom tune your C63?

oliver@velosdesignwerks.com

Yes this is a realistic number but it will also vary. Instead of peak power you may pick up more power in the mid range, etc. Let me know if you have any specific questions that I can assist you with.

C63newdude

I live far from MHP but I trust their in house bench files because they are straight from cars tested on the road and dynos. I am aware that it might not yield the most HP but I am OK with that because I am sure it is tuned with some safe margin in mind.

PetroC63

Had mine custom tuned by MHP last month. Picked up 17RWHP & 20RWTQ at the wheels and 30RWTQ in the midrange from 3,000 to 5,000 RPM with a razor flat a/f ratio.

https://mbworld.org/forums/c63-amg-w...93-octane.html

jacob502

444rwtq is just amazing man. I'm sure your car accelerates like a monster

PetroC63

It was very noticeable after the dyno tune. 30RWTQ in the midrange is a huge kick in the ***.