Car feels slow... Oh no, it *is* slow!

[alpinestars]

I am not aware of any mods, but I did post my times on this board to establish exactly that. Mine is running significantly quicker than the times in EVO mag so I suspected it may have been mapped, or it's very healthy!. Just to complete the picture, 70 to 90 in 2.7s and 30 to 100 in 8.3s. All the times are in S mode and what you might call kickdown ie, for the 30 to 70 run, I get it rolling and up to about 20 mph and then accelerate hard - I don't like launching a car from standstill. Hope this helps and I would be interested in your times.

[Shoppinit]

I'm thinking of changing the DV's, N75 and MAFs and calling it prevenive maintenance. What do you think? Nothing is terribly expensive...

[drybeer]

I thought a 30 - 70 time had to be starting at *30* mph, at least I thought that's how the mags tested them.

Can you do a 20 - 100 and still count the 30 - 70 which happened in the middle? I would have thought not, as the car already has momentum...

That could explain the differences in times?

[Shoppinit]

I don't know to be honest.

At full throttle starting from below 30, the turbos would be already spooled up, the n75 already fully activated, etc. Whereas, if you're cruising at 30 and put your foot down, then you'll need to wait for this to happen.

[drybeer]

Yes - that was my understanding too - and hence in a magazine review it would be a more accurate test of one car against another...

Interesting question - does anyone know which is the official way to do it?

[alpinestars]

Yes - that was my understanding too - and hence in a magazine review it would be a more accurate test of one car against another...

Interesting question - does anyone know which is the official way to do it?

I am pretty sure the way it's measured is a straight 0-100 run and then presented as time in increments of 10 mph. Look at Autocar tests and they do exactly this. The 30-70 time is always a slice of 0-100 time. So therefore to get a "magazine" 30-70 run you would need to do a launch from 0. Anyone who has done one of these will know that 30 comes up pretty quickly and things would be on full chat by 30, so not materially different from starting at 20 and kickdown. There would certainly be very little difference in the 30 to 100 time using either method.

I just think it's a great way of determining how quick (or slow!) my car is versus others. I don't think getting an exact VBOX time is the point here, it's getting a repeatable (ish) way of doing a run and being able to compare from one car to another, so things like whether the speedo is totally spot on is not relevant.

[Stuart6587]

Autocar and I would therefore assume all car magazines test the same way:

30-70mph indicates overtaking ability through the gears

this is done by getting to and maintaining 30mph and then flooring it (kick down for autos) and is not done by doing a standing start from 0-100 mph

[drybeer]

Autocar and I would therefore assume all car magazines test the same way:

30-70mph indicates overtaking ability through the gears

this is done by getting to and maintaining 30mph and then flooring it (kick down for autos) and is not done by doing a standing start from 0-100 mph

This the way I understood it. I don't think the other way of doing it actually gives any relevant measured performance, and when you overtake you don't start at 0 mph, but at a speed, i.e 30mph or 50mph.

[MoRS6+]

Yeah but in which gear? You could do 30-70 in several different gears so the 30-70 is a bit daft unless that is the car you are comparing it against has the same gear ratio as the one you are using.

If you wanted to compare the 30-70 times for an RS6 vs, I dunno, say a manual 2.0 Mondeo, then in order for it to be fair you'd need to select which gear ratios most closely match or else the test would be utterly meaningless.

I mean, if you took 2 RS6's and did the 30-70 test with one car in 2nd and the other in 3rd, then obviously the one in 2nd would cane the other. What you'd need to find out is what gears they used to do the tests in the magazines, brochures etc.

[SteveCuz]

I don't think its daft. You choose the best gear for the job. It shows a real world situation. You are sitting behind a car you want to over take, you are currently doing 30, you want to compare how quick your car can get round it.

Steve

[MoRS6+]

Sorry, I didn't mean the actual 30-70 test was daft! I was just purely referring to whichever gear you use to do it for a fair comparison regarding measuring the times.

Mo.

[drybeer]

Yeah but in which gear? You could do 30-70 in several different gears so the 30-70 is a bit daft unless that is the car you are comparing it against has the same gear ratio as the one you are using.

Sorry Shoppinit - I appeared to have hijacked your thread - not intentional - but it's still relevant as it pertains to your accel tests and whether the readings match previously obtained results.

M0RS6+ - I think that's the whole point - the cars you would be comparing would each have been put by the driver in the best acceleration gear they have for the given speed.

So surely it's entirely relevant as it's the quickest either car can possibly achieve the acceleration ?

[Shoppinit]

No problem, it's an interesting discussion. Much of my problem is not having a yardstick.

Thinking about my logs, I'm getting full boost so I'm probably getting all the power - maybe just a little late. Or maybe I'm just used to the car.

[MoRS6+]

What I should have said was that there are two ways to carry out a 30-70mph test: 1) In gear or 2) Through the gears.

Depends what you wanna know (i.e. the cars outright performance or it's in-gear accelerative abilities to show real-world grunt). However, the in-gear test becomes difficult to carry out on an automatic since it will try to kick-down, so that is the only reason I 'poo-poo'd' it!

No pedantry intended!

Back OT, how's the car running now geez? When you said 'Car feels slow', did you mean suddenly (and noticably) slower, or just slow in general? I know my plus felt quite slow when I first got it but then the mileage was quite low. Since I had my service done at MRC, the car feels quicker than ever. How far away are you from MRC/Unit20? Perhaps a quick diag. check?

[Shoppinit]

Mine's the opposite. Felt fast when I got it, now it doesn't feel quick off the line. It's definitely quick for fast driving.

Unfortunately I'm too far from the UK for it to be practical to get to MRC, let alone Grizz. Possibly MTM Paris at a squeeze, but I don't know anything about them.

Also, I like to know how things work and get a lot of satisfaction from sorting it myself.

Right now, it running OK. Seems to be hesitating at full throttle runs (couple of micro flatspots). It's definitely quick, just not 450hp quick. Especially off the line.

I didn't get any feedback from my 032 log, so I'm not sure if it's good or not. It not close the the limits, but shows that the car's running slightly rich (from negative values).

I was told that there is no lambda correction at full throttle. Anyone confirm this?