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Author Topic: Audi RS2  (Read 291129 times)

Offline GintsK

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Re: Audi RS2
« Reply #285 on: November 30, 2009, 03:26:27 am »
Duty cycle you can easily find in datalog of power run.
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Offline AVP

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Re: Audi RS2
« Reply #286 on: November 30, 2009, 03:36:43 am »
is that the duty cycle1?

then i can see it going even above 100%, sometimes 107.esp on 3d gears after 6200rpm.On higher gears it stays around 88-90%.

that doesnt sound right to me...

Also how can the duty cycle be more than 100??
« Last Edit: November 30, 2009, 04:17:51 am by A80Avant »
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Offline gunni

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Re: Audi RS2
« Reply #287 on: November 30, 2009, 05:07:07 am »
It´s calculated duty cycle from known PM and RPM.

Looks like your hitting your injectos maximum.

Depending on your BSFC you should be seeing 400-450hp with that duty cycle and that is about the end of the compressor as well
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Offline AVP

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Re: Audi RS2
« Reply #288 on: November 30, 2009, 05:16:01 am »
i see.
when i decreaced the VE on the top end to get leaner than 0.72 lamda it seemed to get less than 100% duty cycle.

I always thought that i would be going leaner at the top end when my injectors were maxed out.In this case my injectors are maxing out although i dont want them to!

anyway, good thing i have the 630cc injectors on the bench for the next turbo!
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Offline AVP

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Re: Audi RS2
« Reply #289 on: November 30, 2009, 01:31:14 pm »
what is that trigger error though?

and can anything be done for it?
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Offline GintsK

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Re: Audi RS2
« Reply #290 on: November 30, 2009, 08:40:17 pm »
Quote from: A80Avant on November 30, 2009, 03:36:43 am
is that the duty cycle1?

then i can see it going even above 100%, sometimes 107.esp on 3d gears after 6200rpm.On higher gears it stays around 88-90%.

that doesnt sound right to me...

Also how can the duty cycle be more than 100??
May be on first gears EgoCorrection is too slow to reach target (too rich VE table)? What was Ego correction on highest gears?
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Offline AVP

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Re: Audi RS2
« Reply #291 on: November 30, 2009, 11:48:05 pm »
ego correction is off above 100kpa
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Offline GintsK

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Re: Audi RS2
« Reply #292 on: December 01, 2009, 03:48:10 am »
Then at same rpms and same boost same duty cycle is expected.
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Offline AVP

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Re: Audi RS2
« Reply #293 on: December 01, 2009, 01:51:56 pm »
Yes i noticed that now.

i have more than 100% duty cycle above 6500rpm and lamda going from around 0.72-0.75. I guess if i ran it a bit leaner the injectors could cope.

Anyway, that is good to find out eventually! so no higher boost running for me until i fit the 630cc injectors!

 
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Offline AVP

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Re: Audi RS2
« Reply #294 on: December 05, 2009, 06:11:34 pm »
will upload a video shortly of my idle. did some more tests today and eliminated some early knock on the onset of boost.marc swanssons knock cable works like a treat.
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Offline AVP

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Re: Audi RS2
« Reply #295 on: December 05, 2009, 08:05:02 pm »
« Last Edit: December 05, 2009, 08:15:48 pm by A80Avant »
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Offline AVP

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Re: Audi RS2
« Reply #296 on: December 06, 2009, 05:43:21 pm »
I did some runs today, and managed to get the 4th gear pull properly.
the road had a 4meter downhill incline from start to finish of the run and the IATs were 9C at start and 23C at finish.

small amount of water/methanol mix was used, which starts from 240kpa and sprays total injector capasity at about 400kpa. I have setted it this way cause i dont want too much mixture to be used anyway.

I calculated the results using the perfomance box and 15% driveterain losses, or 18% losses (4wheel drive). All the rest of the losses(rolling, air) are calculated in the graphs and power is estimated by using acceleration differences from speed vs time and grouped at 10 values(as the perfomance box gives you a number at every 0.1sec on the excel export).

Boost used was 304kpa overboost and 270kpa at 6400rpm.

really pleased with the results!



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Offline gunni

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Re: Audi RS2
« Reply #297 on: December 06, 2009, 10:10:56 pm »
That engine is choked at higher rpm´s
nothing a bigger turbo will not fix.
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Offline AVP

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Re: Audi RS2
« Reply #298 on: December 06, 2009, 10:28:11 pm »
Yup! i hope that nice holset will fix that!!!

Super HX40 ok?
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Offline gunni

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Re: Audi RS2
« Reply #299 on: December 06, 2009, 11:04:22 pm »
That´ll be perfect.
Same turbo I´m going to be using on a couple of M50B25´s
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