My S4 Power :)

N

Nez

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Hi guys
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Today was my S4 day and I finally managed to take it to Rolling Road Day
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to be honest I was only taking it as power run to see what sort of power it was putting and I was thinking around 320 BHP
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but after few runs and the car was putting 341 BHP
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I was amazed of seeing the power
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and I thought there was something wrong but it wasn't the car was putting 341 BHP and 410 Torque
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Any ways here is few picture of the day
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Few BMW's
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Onething was amazing that on the Screen of the computer the power was 341 BHP but after printing the result out it came up as 339.3 BHP
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computer error
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I can't wait to put the RS4 intercoolers now
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where did you have that done mate? and how much do they charge just for a rolling road check?
 
what map is that?
there is something a bit funky about the curves there.
you shouldn't be losing power like that after the peak and the peak bhp and torque are at opposite ends of the curve to normal S4/RS4 delivery?
like this:
10927-2001-Audi-S4-Dyno.jpg
 
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its not the torque figure itself.
its the fact the dyno says it is coming in at 7250rpm. Isn't that past the rev limiter anyway?
 
Jcb: The torque figure is down at 250lbft at 7250rpm, you;ve got the curves backwards?

Its the power thats right up the top.

The spike of torque is unusual though?
 
ha! didn't even see that!

but it is still a odd torque curve.
still interested to see what map as it appears to be still going strong at 7k+ so rev limit is obviously removed
 
There's nothing wrong with that torque curve, infact it's pretty typical of an MRC map.

Nez, the difference in power between the screen and the printout will be because they applied a correction factor which takes into account barometric pressure, etc.
 
Looks fine to me. The scales are funky, not the numbers. Most places use the same
scale. The peak is probably from overboost which all these ECUs have - supposed to
give you a bit more grunt for overtaking. Doesn't work in my car, just makes it sound like
an asthmatic pig having a ****.
 
looks like typical dyno lottery BS

isnt 7250 past the limiter?

the program on the dyno requires you to choose a gear and set the car to X-RPM, they start the program ((usually by remote etc) and then you floor the throttle

if the operator was not at x-rpm exactly the figures are wrong (because bhp is nothing more than a mathematic figure)

hence, Regurgitating what i hope has been posted a million times here before, rolling roads are useless for finding out the bhp of your engine

the torque plot looks normal for an s4 on standard turbos (torque spike followed like diesel like plumet)
 
The dyno should have a tacho pickup, so it knows exactly what RPM the engines at.

The dastek system tells the operator to give it some throttle, and uses the roller brake to hold the engine at 3000rpm, then it works out the gear ratio from the roller speed at 3k. It then tells the operator to back off the throttle and take the engine down to idle, then floor it once its ready.

A properly configured rolling road WILL give you a good approximation of your engines output. The dastek rollers at their headquarters in dalgety bay were within a few % of book power on various stock motors on the few occasions i've been there. Its always useful to have a standard car or two along at a rolling road day, as it gives you an idea of how accurate the rollers are.

The issue, is a badly configured rolling road will give some completely made up crap, and that can be an issue.

It also doesnt actually get to 7250rpm, and the rev limiter will be set to whatever MRC set it to.

You keep banging on about this torque spike, what you dont seem to get is that its entirely normal for tuned OE turbos, and the only way you'll get anything else is with a massive blower. Problem then is it then wont come on boost till 4k, but it will give you a nice flat curve from 4k to 7k, and will be making about 600hp. It will also be ****** horrible to drive as a road car.
You could map the above car with a flat curve, and have say 300lbft from 2500rpm to 6000rpm, but it WILL be slower, and less tractable on the road.
 
Blue_Thunder said:
There's nothing wrong with that torque curve, infact it's pretty typical of an MRC map.

Nez, the difference in power between the screen and the printout will be because they applied a correction factor which takes into account barometric pressure, etc.
Click to expand...

Oh ok I thought that there was something wrong with the computer :)
 
Paul1982 said:
I never thought the S4 torque level on a remap would be 410lbft?? No saying yours is not but my 2.7tt in my allroad made 320bhp and 340lbft torque - 410 is alot!!
Click to expand...

With MRC Mapping you can get that :) and my Powerflow exhaust system is somehow working very well with MRC remap :) I my self was amazed when I saw the result :undwech:
 
jcb said:
ha! didn't even see that!

but it is still a odd torque curve.
still interested to see what map as it appears to be still going strong at 7k+ so rev limit is obviously removed
Click to expand...

Yeap Rev Limit was removed when the mapping was done and the top speed limiter was removed too :thumbsup:
 
As said, AMD had tons of S Audis on their rollers, and they generally went way past 155 mph. The limiter seems to have been a bit of a farce.

Not really 'Wacko' if that's what they found.
 
Dan Gliballs said:
As said, AMD had tons of S Audis on their rollers, and they generally went way past 155 mph. The limiter seems to have been a bit of a farce.

Not really 'Wacko' if that's what they found.
Click to expand...

This is on MRC web site:

Full engine health check, Fault codes verification, ECU reprogramming, Top speed limiter removal, Post-tuning analysis and verification​


These are the jobs they do when you do remap with them :thumbsup:​
 
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I know dude, they ALL state that on their websites.

I'm just repeating AMD's findings,...infact my mate at QST down here said the same.
 
i asked about the speed limiter when mine was remapped and was told he would have to take it to elvington airfield to test as it was mapped on the road not rollers, his computer package just showed it as a numerical value not relating to speed or rpm in any way like the rev limiter and said he'd have to run the car then increase the numerical value and then run it again but even before my remap i've seen 165mph indicated and it was still pulling (@ elvington raceway of course).....
 
Just spare a thought for the consequences of what might happen at even the limited top speed chaps.

Would only take for a tyre to burst or a laser toting cowboy in a hi-viz vest to jump out and you could end up in hospital, jail or worse!

:slap:
 
Now look!!! Any speed over 155mph will kill you and your tongue will come out of your eye, but anything UNDER 155mph will cause you a sprained ankle. FACT!!!
 
Dan Gliballs said:
Now look!!! Any speed over 155mph will kill you and your tongue will come out of your eye, but anything UNDER 155mph will cause you a sprained ankle. FACT!!!
Click to expand...

classic:applaus:

the only reall difference between 130-165mph is the wind noise...although just because 100mph feels like walking pace on a motorway in an s4
you'll still be very very lucky to walk away from an incident at anything over 70mph thats why the limit is 70....:racer:
 
You should hear the wind noise when the needle runs out of numbers on the dial!
 
i plan to... as soon as my gutted rs4 exhaust and new tyre's are on.gonna use my gps to confirm it. the fastest i've been is 178mph indicated on a gsxr 750 but i cant see my car beating that without spending mega bucks...
 
It s naughty and rather dangerous yes, but i had to abuse the autobahns just a wee bit on my way to and from the ring, I lost my nerve a bit at 160, coming up rather quickly to some roadworks! But from the camera I still had another 1000revs left......so just wanna know what she will top out at now!

Oh and nice power figure mate, I'm def gonna get on the case of my de-cats now! And some nice big shiney ER coolers!
 
so was that 160@ just over 6k rpm? i cant say i've paid that much attention to the rev counter at that speed a cheeky glimpse at the speedo and then eyes on the horizon again. roughly 27mph per 1000rpm in sixth i think isnt it? so if you could hit 7k roughly 186mph.. i'm sure i've seen stage 2 s4's doing 174mph on you tube and 186mph on nogaroblue.com
 
Can't find the vid we took, but iirc as we touched 160 we just passed 6k, so i was guessing around 175, but only cos that sounds reasonable for a stage 2, I'll look on nogaroblue again, thought they were further along in tune when running 180+
 
Bear in mind that at 80 indicated on the speedo the car is doing about 73-75 on GPS and it will probably get further out as the speed climbs.

On the standard 225/45r17 tyres, and assuming a 6th gear ratio of 0.684:1 and a 4.111:1 final drive, at 6000rpm you will be doing 158mph

Not sure what the rev limiter is, but the same data at 7k gives 184mph
 
i should add the reason you'll begin to struggle much over 160 is that the standard turbos run out of puff there and your power begins to drop off, so while at 6k you might have enough power available to get to say 180, by the time you've got to 6500rpm your powers dropped so much that you no longer have enough.

As such cars with larger turbos that will hold the power to the redline will fare better once the revs get into such a high range.
 
The stock gearing on an S4 is actually 24.7 mph/1,000 rpm, may be indicated as 27/28 on the speedo.

The DSY in my car came from a 2001 S4, though it's a bit different.

I also purchased a 6-speed from a 2003 A6 Allroad 2,5 TDI, for the princely sum of £75. The car had been in a crash, and both tranny brackets were torn off, taking the threaded bosses with them.

I installed 4th, 4th and 6th gears into my S4 DSY, and my car is now geared to do 37.5 mph/1,000 rpm. The S8's beefy, linear torque means I can still pull strongly, even in the higher gears from low speeds. Will be interesting to see what the top end is.
 
I soooo miss my 6 speed, thanks the lord i have press down reverse, or i could well have been collecting my gearbox from the motorway more than once
 
I suspect even without push down reverse you'd not actualy be able to engage it...

Reverse doesnt usually have a syncro, which is why it grinds if you select reverse will still rolling forward. At motorway speeds you'd probably jsut get a lot of grinding and not much else, unless you were trying to change gear with your pop-eye arm...
 
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