performance log

Post by **flashyg** » Fri Jul 08, 2005 9:15 am

I just wondered how other full miltec satge 3 tuned cars run.
I devised a simple low stress test so that I can compare performance in the future and know the car is making power.

Find a quiet piece of privately owned large road, like a motorway.
note external temp air con off windows up.
4th gear allow car to go to 40 mph. maybe use a slip rd.
set stop watc to zero
full throttle from 40 @ 200 revs, when the car reaches 3,00 revs hit the timer.
Let the car get to 6 and stop the watch.
20c 7.5 sec (car felt a littel slow to me)

Post by **smurfbus** » Fri Jul 08, 2005 10:11 am

Why not use the FATS test 4200-6500rpm logging with vag-com engine block 003 (or 011 witch I use to get intake temps)

reference times and closer description go to http://fats.audi-quattro.org/

there are few good links you might want to take a look at also.

FATS+ is 4000-7000rpms but its not so easy to hit 7000 with vag-com sampling rate.

Times are not exactly comparable in the database as RS4 third gear is a little shorter than in S4, but this way you can see how your engine is doing compared to your prior runs.

Post by **tartan_rob** » Fri Jul 08, 2005 10:13 am

I'm going to try this tonight in the S4...it may be an interesting comparison.

Post by **flashyg** » Fri Jul 08, 2005 4:34 pm

I will be intrested if you or any other RS4 owners would try especially stage 3 MTM etc.
Thanks guys .
I have no vag com. But I will get one asap

Post by **flashyg** » Sat Jul 09, 2005 9:50 am

ok TR how did that super s4 do on its friday night bad boy run. Was the 4th gear too fast for the roads!

Post by **tartan_rob** » Sat Jul 09, 2005 1:10 pm

Not likely...I could not get a good run in, bad traffic all the way home and then when I finally thought I could start, my Road Angel started going mental with hand held lasers on me.....I got the feeling that tonight would not be "the day" and I decided to abort any high speeds at all....got home to find that the Mrs had a nail in her tyre and a replacement set cannot be sourced until Tuesday so she now has my car. However.....I am driving over to France on Wednesday so will try over there and report back the week after....

Post by **flashyg** » Sat Jul 09, 2005 1:14 pm

enjoy the drive,

Post by **bakerdcb** » Sat Jul 09, 2005 3:44 pm

Hi Gordon, just tried your little test a few times on my own bit of empty private road obviously.

Unfortunately it was bit warm 28.5C, so I suspect this may have put a slight dampener on performance but managed 7.52 sec. twice on the same piece of road. Mine has MTM stage I so should be pushing around 420bhp but I have no other performance mods. Sounds pretty similar to your figure but if I remember rightly your avus has stage III ? If the temperature drops I will try it when its cooler and see if that helps.

Post by **flashyg** » Sat Jul 09, 2005 6:33 pm

excellent mate this is what I needed to know.
Mine feels slower than usual but I was running some so called 97 ron from sainsburys.
I put in a bottle of millers but I think the fuel may have been <beep>.
I recorded 6.7 on a previous trial back in the early part of the year.
I have tanked up the car with opti and millers to get over the <beep> fuel and later tonight in the cool I will try again.

Good test what do you think?
I have the cats on mine and this should be givving better results that 7.5.
I tried with the maf plugged in and out the results were the same.
It can be quite frustrating knowing the car is well so thanks to any one who does the test. think I will go and test now.
If you don't hear from me you'll know.

Post by **flashyg** » Sat Jul 09, 2005 8:03 pm

so 7.5 is still the time. I hope sainsburys don't sue me.
I have tried for boost / maf /Dv issues what else could be taking performance but not throwing limp mode.
Could old spark plugs be doing it 10k miles it id due its service this has been coming up now on the dash.
I change the oil every 5k anyway and run proper good oil.
I guess the only thing it could be is plugs /faulty egts any comments or anyone having similar experiences with power loses or even perceived power losses.
I badly need a vag com near Manchester.
Anyone got a vag lead for sale
G

Post by **bobjebb** » Sun Jul 10, 2005 7:33 pm

I'd be happy to have a go if I knew how... Forgive the ignorance but what does outside air temp specifically have to do with things?

So, select 4th gear allow car to go to 40 mph.. I'm with you so far...
Set stop watch to zero. Got that...
Then floor it till 3,00 revs (remaining in 4th?)
Start stopwatch.
Stop the watch at 6,000 rpm.

Record the time and the outside air temp.

Correct?

And what do the figures actually represent? Thanks and feel free to ignore if I'm being dim. I'll put it down to sunstroke at the cricket today.

Post by **bakerdcb** » Sun Jul 10, 2005 9:17 pm

Outside air temperature affects the density of the air. Colder means denser, means more oxygen, means better bang/combustion, means more power. Thats also the principle behind your intercoolers, to cool exhaust gasses from turbos, but they are also less effective if ambient temperature is high. Or at least thats what I always thought.

I'm sure someone with a greater knowledge will tidy this up Bob with a proper scientific explanation but basically colder air will allow your engine to develop more power. Having said that warmer air produces less drag so . . . .

Help, think I've got sunstroke

Post by **flashyg** » Sun Jul 10, 2005 9:58 pm

Yes the reason for the air temp is to simply give a perspective.

Post by **JonnyX** » Mon Jul 11, 2005 9:29 am

bakerdcb wrote:Outside air temperature affects the density of the air. Colder means denser, means more oxygen, means better bang/combustion, means more power. Thats also the principle behind your intercoolers, to cool exhaust gasses from turbos, but they are also less effective if ambient temperature is high. Or at least thats what I always thought.

I'm sure someone with a greater knowledge will tidy this up Bob with a proper scientific explanation but basically colder air will allow your engine to develop more power. Having said that warmer air produces less drag so . . . .

Help, think I've got sunstroke

Firstly, I am not arguing that colder air isn't better because it is (much) but it may not
necessarily result in more power.
I think it also depends on the mapping. The ECU is just trying to meet a requested torque
value using the maps it has. What you may find is that the ecu simply requests less
boost when the air is colder. This is also a good thing.

Post by **bakerdcb** » Tue Jul 12, 2005 9:53 am

Recovered from sunstroke and found this which explains much better than me. Well its sort of what I was trying to say

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