Low power output, B7 RS4
Re: Low power output, B7 RS4
The report that come back from the engine engineering place said seals, so if it was guides also that wasn't talked about. I think in this case while it would have been an option to replace the seals, Audi choose to replace the heads all together. The Dealer had to reassemble the heads and send it to Germany (along with the short motor). I assume they wanted to try to find out what caused the problems.
Re: Low power output, B7 RS4
Got the RS4 re-dynoed today. Managed a 233.5WKW, up from the prior 213WKW.
So its a definite step in the right direction!
Since the old dyno it has:
> Had the Airbox powerflap fixed. Was suppose to open at 5000rpm, but was stuck permanently closed
> Had the inlet manifold removed and carbon cleaned.
I still feel that it should have 'more'. Given that my old B5 (stock 280kw flywheel) produced 229WKW, this B7 (309kw Flywheel) should be into the 24xWKW area considering its just been carbon cleaned.
Running out of ideas. Unless the Carbon clean was a quick one, and not thorougher?

So its a definite step in the right direction!
Since the old dyno it has:
> Had the Airbox powerflap fixed. Was suppose to open at 5000rpm, but was stuck permanently closed
> Had the inlet manifold removed and carbon cleaned.
I still feel that it should have 'more'. Given that my old B5 (stock 280kw flywheel) produced 229WKW, this B7 (309kw Flywheel) should be into the 24xWKW area considering its just been carbon cleaned.
Running out of ideas. Unless the Carbon clean was a quick one, and not thorougher?

2014 RS6 (2023 on order)
2017 Q7
1993 E36 M3 Tarmac Rally car
2001 Porsche Boxster circuit car
2017 Porsche 991.2 GT3 Clubsport
2017 Q7
1993 E36 M3 Tarmac Rally car
2001 Porsche Boxster circuit car
2017 Porsche 991.2 GT3 Clubsport
Re: Low power output, B7 RS4
Did you log timing and intake temp during the Dyno run?
Re: Low power output, B7 RS4
No VAGCOM2manytoys wrote:Did you log timing and intake temp during the Dyno run?

2014 RS6 (2023 on order)
2017 Q7
1993 E36 M3 Tarmac Rally car
2001 Porsche Boxster circuit car
2017 Porsche 991.2 GT3 Clubsport
2017 Q7
1993 E36 M3 Tarmac Rally car
2001 Porsche Boxster circuit car
2017 Porsche 991.2 GT3 Clubsport
Re: Low power output, B7 RS4
I don't think you really have anything to worry about. The power curve looks ok and the torque curve is mostly ok.
Without knowing your actual intake temp and timing it's hard to say for sure. It looks ok though.
Remember the RS4 has pretty aggressive hot air correction and depending on the Dyno setup you could have intake temps in the 50's C. I don't think the RS4 is a car that will produce great numbers on a Dyno because of this.
You really need Vagcom if you are still worried.
Cheers.
Without knowing your actual intake temp and timing it's hard to say for sure. It looks ok though.
Remember the RS4 has pretty aggressive hot air correction and depending on the Dyno setup you could have intake temps in the 50's C. I don't think the RS4 is a car that will produce great numbers on a Dyno because of this.
You really need Vagcom if you are still worried.
Cheers.
Re: Low power output, B7 RS4
kiwi_mtm, the dyno runs that you have had done; was it just one power run each time or are the results you have posted the mean or the best of the runs done on each occassion?
RS4's don't tend to give peak figures until after a few runs. The difference you have seen could well be attributed to a combination of atmospheric changes (I notice temp and humidity are down and pressure is up on your improved figures as much as a correction factor is added), properly functioning airflap and the technician give your air filter a bash to clean out the crud.
It could also add to the discussion that carbon does not affect power.......
RS4's don't tend to give peak figures until after a few runs. The difference you have seen could well be attributed to a combination of atmospheric changes (I notice temp and humidity are down and pressure is up on your improved figures as much as a correction factor is added), properly functioning airflap and the technician give your air filter a bash to clean out the crud.
It could also add to the discussion that carbon does not affect power.......

Re: Low power output, B7 RS4
It was run twice only on both occasions.P_G wrote:kiwi_mtm, the dyno runs that you have had done; was it just one power run each time or are the results you have posted the mean or the best of the runs done on each occassion?
RS4's don't tend to give peak figures until after a few runs. The difference you have seen could well be attributed to a combination of atmospheric changes (I notice temp and humidity are down and pressure is up on your improved figures as much as a correction factor is added), properly functioning airflap and the technician give your air filter a bash to clean out the crud.
It could also add to the discussion that carbon does not affect power.......
I'll also note that the car had only been driven probably 1,000kms since the de-carbon.
From a bum dyno perspective, after the airbox flap and de-carbon (hard to know whats contributing) it feels noticably quciker up top and you get a real 5500 kick, Honda vtec style (but without the torque steer!).
2014 RS6 (2023 on order)
2017 Q7
1993 E36 M3 Tarmac Rally car
2001 Porsche Boxster circuit car
2017 Porsche 991.2 GT3 Clubsport
2017 Q7
1993 E36 M3 Tarmac Rally car
2001 Porsche Boxster circuit car
2017 Porsche 991.2 GT3 Clubsport
Re: Low power output, B7 RS4
I got a more pronounced 5500rpm 'kick' when I replaced my air filter and cleaned the airbox / flap the other week prior to service so it may be that attribute to what you have felt.
Re: Low power output, B7 RS4
2014 RS6 (2023 on order)
2017 Q7
1993 E36 M3 Tarmac Rally car
2001 Porsche Boxster circuit car
2017 Porsche 991.2 GT3 Clubsport
2017 Q7
1993 E36 M3 Tarmac Rally car
2001 Porsche Boxster circuit car
2017 Porsche 991.2 GT3 Clubsport
Who is online
Users browsing this forum: No registered users and 142 guests