JCviggen's misano B7 RS4 - work in progress

B6/7 S4/RS4
#281

No idea I don’t know anyone who has tested 100-150

You can manually launch the car. Launching from an rpm that is above the launch assist trigger doesn’t really help anyway. You’re best launching from mid to high 3000s in my experience. 3700-3800 rpm, no slip just drop it.

I’ve done that a number of times. Stock clutch. Now at 148,000 kms.

Slipping it is where people roast their clutch. Same goes for changing gears, if you slip it on shifts you have problems.

Launch like you shifted and you’ll be fine.

That brought me 1.7-1.8 60 foot times.

A friend with your modlist routinely had mid to low 1.7 60 foot times.

A 1.7 60 foot time in that first video would mean a 12.2@112 1/4 mile time. Of course you also went 20 feet downhill so don’t garner too much from that in comparison to times at flat dragstrips.

#282

Yes I can, but even if I launch it at 3000RPM the LC will cut in after the actual launch when I get to 5500 in 1st gear. It will stay there for half a second or so and then it continues. This happens on any kind of quick-ish launch, the only way to avoid it is go really slow like in the video.

I don’t need JHM to troubleshoot it, I’m fine if they just remove the LA from the tune when I flash to one that removes the SAI and intake flaps.

If you pause the YT video the vboxverify shot of the 1/4 mile run is there - the road for that run was flat until about 100 MPH and then sloped off a few feet for a total decline of -0.37%. Not going to make a real difference.

A friend of mine (the daytona B7 I posted a picture of) fitted a new engine to his MRC tuned RS4 and did 100-200 km/h in 9.2 seconds on his Pbox at 2 degrees C and 0.2 slope. Best I could manage was about 9.8 seconds but on winter tires. I could see 9.5 being possible had I still been on summer tires like him, but to catch up I’d probably need to get a carbon clean.

I did find a few 100-150 times:

Z4M : 21.5s, (C&D, June’06), 330HP, 3300lb

2009 GT-R : 16.2s, (C&D, Aug’08), 480HP, 3900lb

2011 GT500 :14.5s, (C&D, Aug’10), 550HP, 3800lb

C6 LS3 Z51 : 14.3s, (C&D, Sep’07), 436HP, 3300lb

E63 AMG : 13.9s, (C&D, Dec’09), 518HP, 4200lb

Jaguar XFR : 13.4s, (C&D, Dec’09), 510HP, 4400lb

2012 Carrera S:13.1s, (C&D, Feb 2012), 400HP, 3265lb

E60 M5 6spd manual : 13.1s, (C&D, Feb’07), 500HP, 4200lb

CTS-V : 12.8s, (C&D, Dec’09), 556HP, 4300lb

Panamera Turbo : 12.2s, (C&D, Apr’10), 500HP, 4300lb

E60 M5 SMG : 11.3s, (C&D, Jan '06), 500HP, 4200lb

2013 GT-R: 10.6s, (C&D, Feb 2012), 545HP, 3907lb

#283

The stock e60 smg is such a highway monster considering the weight. That gearing and the v10 is still rather impressive especially when compared to the 6 speed!

#284

CountVohn, thank you for the PM, unfortunately the board doesn’t give me access to it.

I’ll be hitting up JHM for the revised tune a short time before I’ll use the car again, which will be early May for a trackday :slight_smile:

#285

weird, I’ve never heard of that. It was designed to only kick in wiht that 5500 RPM trigger from a stop so that you could still launch it manually if you wanted (anyone who wants to launch above 5500 RPM might be a little bit crazy)

as for MRC tuned RS4s, race him head to head. You’ll trounce him. I can’t explain the data re: him being supposedly faster, but my experience with MRC all motor RS4s is they’re just frankly not that fast. 100-150 or 62-124 testing is predominantly high RPM testing so I can see how a carbon clean would help. Reality though is that the area where carbon actually hurts is an area where we don’t spend much time in our typical acceleration efforts.

#286

if everyone gives JCViggen positive member rating he’ll be above zero and able to access PMs. I just did. Lots of good info in the thread that is worth it

#287

+1 here

#288

Shifting and engine superb 🖒♭

#289

Thank you! :slight_smile:

I’m starting to find out that having the RS4 in Europe isn’t as straight forward as I thought it would be. Whenever I fly in, I kind of want to use it. That means if there is a problem or maintenance needs to be done the only opportune time is while I am away. The paperwork required to legally let my father drive a car on Russian plates in Belgium is a right old hassle. Then it needs to be stored in a garage of some relatives but they live an hour’s drive away, and my mother isn’t a big fan of driving on the highway (she’d need to drive the other car that will get them both back home)

The car is quite all right on the whole now, only the intermittent implausible signal from the flap position sensor on bank 1. But I’ve booked another Nurburgring trackday for May 2nd, 600 bucks worth, and I won’t get back to Belgium until 2 days before. I intend to flash the car with a new JHM map, and hope it works because if any issue there isn’t much time to revive the car in time. I’m not 100 percent on whether my brake pads have enough left either. All bloody annoying things to think about while I’m 2000 miles away.

On May 1st (a bank holiday in much of Europe) I’ll have to find someone to change the oil and filter, flash the new map in, do a brake fuild flush, possibly a set of pads, get the Michelin Cup tires on again and get to the Ring by 6 PM for registration and safety briefing. I guess it worked out last year, by the skin of my teeth, but the next one isn’t looking to be any easier.

#290

Nice time 100-200 km I know some guys over here that are low to mid 9 , they go toe to toe with flashed c63 amg …

#291

+1. Definitely enjoy this thread, and lot’s of information as well! Excited to see how you do at the nordschleife!

#292

Yeah that does sound weird. I’ve launched mine lots of times manually and have never had that problem.

#293

I found an Australian guy once who had the same problem. It appears that, somehow, there may be a slight difference in non-US cars that makes a difference to how the LA works.

If I try to use it as prescribed (clutch in, full throttle, ESP off) it will initially work like it should, holding revs somewhere above 5K. It will even launch just fine when I drop the clutch, but then a moment later as the rpm’s in first gear cross the point where the LA wanted to hold the revs with the clutch in, it will stay there for half a second or so and then continue the pull. Issues with stuff like clutch switches have already been ruled out, the car just seems confused but “realizes” very quickly after wrongly getting into the LA mode in first gear that it shouldn’t be and carries on. But the hesitation is just enough to ruin the time. If it really thought that the clutch was in or the car was stationary then it would stay at launch revs and not continue accelerating almost immediately after cutting in.

JHM had heard of the issue before when I asked them about it like 2 years ago or whenever I got the tune, but never heard back of any fix being available. A follow-up email I sent afterwards to Jake went unreplied. It’s no big deal really, I don’t do drag racing and I’d be able to launch my car to a reasonable standard myself if I want to do it once in a blue moon.

I realize the issue is too difficult/impractical to troubleshoot for JHM as the issue does not appear to have ever presented itself a US car. I’m happy to just have it removed from the map at a practical moment in time, such as when I order a revised tune with the SAI and flaps deleted.

[quote]Nice time 100-200 km I know some guys over here that are low to mid 9 , they go toe to toe with flashed c63 amg …
[/quote]
Simply putting my Michelin Cup 2’s back on would probably be enough for a mid-9 too, lower than that I need more mods or a good cleaning I’m guessing. I’m still running the same OEM air filter that was in it when I bought the car more than 2 years ago, too. Have had a cold air feed lying around for ages but never got round to getting the passenger side aux rad removed.

PS: Thanks to all for getting my editing and PM rights restored :slight_smile:

#294

Another year, another Destination Nurburgring trackday in the spring. If you can call it spring anyway, it was cold and the worst day for driving the 'ring in ages as the good weather came to an end a day too soon.

Still got one dry-ish lap in early in the morning before the heavens opened. Seemed like the only cars on track were Porsches, or they just happened to be the ones slow enough for me to come across. Helmet cam video below

https://www.youtube.com/watch?v=w7FS5rNg2QQ

It was a pretty nice and brisk lap, but being the first one of the year and in pretty poor conditions meant not much of a lap time.

Things deteriorated pretty quickly from there, with the Michelin Cup 2’s being more than a little out of their element as the track got wetter. I edited some laps together as a best of/worst of due to the full laps being a bit dull to watch.

http://www.youtube.com/watch?v=0qzHdNGWjNk

Never had the car do 4 wheel slides in 3rd gear before, so grip levels were truly appalling. If I had been going round in a 200K GT3 (RS) I probably would’ve been slow as **** too.

Better next year, hopefully. I’ll need new brake discs as these are warped and crazed beyond saving. During winter storage the pads had rusted to the rotors so badly that my father had to call in professional help to get the car moving while I was still away. Brakes were shaky even after the rust had scraped off and with new Carbotech XP10 fitted it got pretty bad pretty quickly once on track. I’d like to try the JHM rotors but shipping them across a large ocean is the big killer in terms of cost.

Oh, and I removed my comfy seats and fitted Recaro CS (with airbags) because I apparently like doing things the hard way. Took me ages to find in stock, then the seat frames and adapters for the airbag connectors. All told I didn’t spend a lot less than simply buying used OEM buckets.

http://www.greenringer.net/DN17/buckets1.jpg

http://www.greenringer.net/DN17/buckets2.jpg

http://www.greenringer.net/DN17/DN1.jpg

http://www.greenringer.net/DN17/DN2.jpg

http://www.greenringer.net/DN17/DN3.jpg

Special thanks to CountVohn for pushing the software update process along with JHM, who were then very generous in compensating for the delay. I got the SAI and flap delete, no more crazy loud starts and the CEL is gone too :slight_smile: The LA should be gone, too, but I haven’t tested that yet.

I have to say the car feels a little smoother and, dare I say, there seems to be a wee bit less drone on throttle around 2K rpm. Perhaps the mapping for the flap delete is a bit different to make the car behave better at small throttle openings with the flaps missing.