Mod decision

[luffenham1]

Mind made up on the grill especially after the photos. Just going to drop the number plate. Thanks for the offer on the BBS CKs but i think i am going to stick with the CH-Rs if i can get them to fit plus that they look alright once on the car.

[C6NVS]

Cool, be sure to update with some picks when you're done

[ollys]

The gearbox map by MRC makes a HUGE difference when accelerating at full bore, not to be under estimated.

So, do you have this mod then and if so what other mods with it? My understanding was that this mod does two things - it makes the gear changes only very slightly faster than oem, and raises the rev limit to 7000 in all gears. This latter feature only comes into its own if the car is mapped AND has either secondary cat bypass pipes and/or catless down pipes, meaning the car carries on making power at the increased rev limit. Otherwise with just a catback, filters and remap the gearbox map makes little difference.

[andy]

Now you mention it, what are the pros/cons of a secondary cat bypass? I was thinking that if I did get mine remapped I might as well go the whole hog and make the visit worthwhile but not sure if this introduces any issues?

[catfood12]

The gearbox map by MRC makes a HUGE difference when accelerating at full bore, not to be under estimated.

So, do you have this mod then and if so what other mods with it? My understanding was that this mod does two things - it makes the gear changes only very slightly faster than oem, and raises the rev limit to 7000 in all gears. This latter feature only comes into its own if the car is mapped AND has either secondary cat bypass pipes and/or catless down pipes, meaning the car carries on making power at the increased rev limit. Otherwise with just a catback, filters and remap the gearbox map makes little difference.

Ollys - Correctamundo fella. MRC Doug talked hinself out of a gearbox remap sale on my recent visit, explaining exactly what you said above. Lower revs power is limited to sensible levels to save the transmission anyway, onwards from stage 2 and MRC800 just maintain power above standard peak, around 6700 RPM, to over 7000. Exhaust, then turbos, become the limiting factor.

See my next post in reply to Andy's next question...

[catfood12]

Now you mention it, what are the pros/cons of a secondary cat bypass? I was thinking that if I did get mine remapped I might as well go the whole hog and make the visit worthwhile but not sure if this introduces any issues?

Stage 2 remap power peaks around 6700 RPM, same as stock. To push this up needs exhaust and optionally secondary cat bypass. MRCs recommended solution was Supersprint secondary cat bypass pipes and Milltek, then custom engine map and gearbox map to make most of area around 7000 RPM.

After stage 2 however you do need better brakes than stock steels if you're pushing on, say on country roads. Mine are now all properly blued and crazed on the surface. That's my next upgrade. We're trying to haul 2 tons of steel down from three figure speeds. Smelt like a cluth on a pensioners Daewoo Matiz.

[andy]

Cheers for that explanation Cat, much appreciated I've already got the Milltek fitted so part way there, ok only a small part Would seem that just the stage 2 is the best bang for our buck then and anything more is another big step up cost. Still, always good to have further options open if you get bored again

[catfood12]

Cheers for that explanation Cat, much appreciated I've already got the Milltek fitted so part way there, ok only a small part Would seem that just the stage 2 is the best bang for our buck then and anything more is another big step up cost. Still, always good to have further options open if you get bored again

I will doubtless get the Supersprint pipes and a Milltek. Priority now is the brakes, after coming a bit too close to the trees on the A350 one (fast) night in the week.

[andy]

Nothing like a close encounter with a tree to make you realise the value of good brakes!! Often overlooked but this is a big heavy brute that takes some stopping once getting a wiggle on.

[scottie1979]

Just for my own interest - if you were to take your RS6 to MRC for the 700ish hp transformation what should you be legally be declaring to have modified on your insurance? Obviously power increase, but what else ?

[bobjebb]

Just for my own interest - if you were to take your RS6 to MRC for the 700ish hp transformation what should you be legally be declaring to have modified on your insurance? Obviously power increase, but what else ?

Nothing else I don't think just the amended output figure... Not sure how many declare the changes? Likewise with Audi in terms of warranty...

[doodlebug]

Audi will work it out for themselves. If you goose your drivetrain reasonable to expect a large bill and no warranty support!

[perthwaRS6]

Now you mention it, what are the pros/cons of a secondary cat bypass? I was thinking that if I did get mine remapped I might as well go the whole hog and make the visit worthwhile but not sure if this introduces any issues?

Stage 2 remap power peaks around 6700 RPM, same as stock. To push this up needs exhaust and optionally secondary cat bypass. MRCs recommended solution was Supersprint secondary cat bypass pipes and Milltek, then custom engine map and gearbox map to make most of area around 7000 RPM.

quote]

Hi catfood,
previous owner of my C6 RS6 sedan had a supersprint exhaust replacing the OEM exhaust- found it too 'boomy' inside with the windows up with the APR map for his liking and went back to standard OEM exhaust FWIW.

Having said that, i most likely will re-invent the wheel and will try an electronic secondary bypass cutout just ahead of the secondary cats.

john

[catfood12]

Just for my own interest - if you were to take your RS6 to MRC for the 700ish hp transformation what should you be legally be declaring to have modified on your insurance? Obviously power increase, but what else ?

Honesty is always the best policy. My insurance company added £35 surcharge (yep, thirty-five pounds), for 'engine ecu chip' modification. No other details requested or provided. Had the same on a previous 535D, same surcharge, not a big deal these days I think as so many do it, and it probably doesn't make a tangible difference to their risk.

[andy]

Who are you with out of interest Catfood?