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LaSource
Nürburgring


Joined: 08 Feb 2009
Posts: 465



PostPosted: Thu May 21, 2015 12:59 pm    Post subject: Reply with quote

freddie44 wrote:
Is there a final "shoot out" chart comparing supposed factory BHP with actual BHP on the day?

Wow Thumb



The results are all mentioned earlier in the thread...but we could do a clearer model by model chart...
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LaSource
Nürburgring


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PostPosted: Thu May 21, 2015 1:04 pm    Post subject: Reply with quote

harveyn wrote:
My 997.2 GT3 was slightly down on power. I normally use Shell V Power, but had BP super unleaded in there on the day. Not sure if that explains it.


Personally I very much doubt that a brand X 97 RON is significantly lower than Shell VPower (Which IIRC is 99 RON).

As an example my 996 GT3 and Shakman's 996 GT3 both had 97 RON fuel from Esso in it (left over post the previous Silverstone trip) and both cars posted a very healthy 396hp and 399hp respectively. We were lamenting not having Shell VP beforehand.

I suspect there is more to it than that which could be - tyres, tyre pressure, state of rear diff, cam sensors, some contribution from fuel brand, etc
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Roro
Long Beach


Joined: 01 Oct 2010
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PostPosted: Mon Dec 19, 2016 8:22 pm    Post subject: Reply with quote

Little thread resurrection... Very Happy

My car made 399.9 last year, and today I popped back in to SRR. I was interested to know whether there was something in the air that day which is why my car didn't achieve the 415 it's supposed to make (although in Evo magazine they state the output as 410, not sure why)

Pleased to report my car produced 409.9 on the dyno today

Not sure how to explain the improved figures though. All I've done is a major service since the original dyno last year, so maybe new spark plugs (Charlie's initial thought...). Actually that would be 2 services - one major last June after the dyno run, and then a minor in June this year. The car is otherwise exactly the same with the H&S bypass being the only engine-related mod. Only other difference is the increased mileage (an extra 3 or 4K now maybe, not been using the car much over the last year or so)
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Cunno
Indianapolis


Joined: 13 Dec 2008
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Location: Nottinghamshire


PostPosted: Mon Dec 19, 2016 8:26 pm    Post subject: Reply with quote

Roro wrote:
Little thread resurrection... Very Happy

My car made 399.9 last year, and today I popped back in to SRR. I was interested to know whether there was something in the air that day which is why my car didn't achieve the 415 it's supposed to make (although in Evo magazine they state the output as 410, not sure why)

Pleased to report my car produced 409.9 on the dyno today

Not sure how to explain the improved figures though. All I've done is a major service since the original dyno last year, so maybe new spark plugs (Charlie's initial thought...). Actually that would be 2 services - one major last June after the dyno run, and then a minor in June this year. The car is otherwise exactly the same with the H&S bypass being the only engine-related mod. Only other difference is the increased mileage (an extra 3 or 4K now maybe, not been using the car much over the last year or so)


Cars like cold air
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Roro
Long Beach


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PostPosted: Mon Dec 19, 2016 9:48 pm    Post subject: Reply with quote

Well that's that then Judge
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LaSource
Nürburgring


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PostPosted: Tue Dec 20, 2016 2:51 am    Post subject: Reply with quote

Yep. Suspect it would be all of the above.
IE new plugs, loser engine with the mileage, potentially higher Ron fuel, different tyres(?), and most of all colder temps. Although Charlie will compensate for colder ambient, some contribution will still seep through.

So basically your car is now putting out same power as my standard 6RS Cool
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Roro
Long Beach


Joined: 01 Oct 2010
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PostPosted: Tue Dec 20, 2016 11:12 am    Post subject: Reply with quote

Actually yes good point re colder air. Indeed it was colder outside, but Charlie did close the doors and put the fan on, I presume (now) partly in an attempt to replicate the conditions of the previous test which was saved on his systems. So maybe it wasn't much colder than the previous test after all. Also tyres were the same (I thought they were different but I checked and they're the same MPSS I used last time)
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Richyd
Watkins Glen


Joined: 04 Feb 2011
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PostPosted: Tue Dec 20, 2016 11:25 am    Post subject: Reply with quote

A good dyno (and I'm sure SRR's will be a good one) will produce an adjusted power figure, taking into account air temp and atmospheric pressure, which changes day to day as well.

For example, my GT4 (after some mods) was dyno'd in Germany last month at 425bhp, which was adjusted to 415bhp. Apparently, the German standard is to give a power figure at sea level and 20 degrees (or something like that). It was a very cold day when I was having the work done, 3 degrees or something like that.

This was at Germany's biggest Maha installation. Really slick operation where they took a mate and I through how the RR works, how they adjust for transmission loss, tyre slippage, all sorts of things. Made me realise how inaccurate some (most) RR's are. For example, the RR we used is calibrated by Maha every 3 months.

Out of interest, my mate had a full tank of 105 octane, mine was 2/3rds 105, 1/3rd 97. My friend has a Akrapovic exhaust fitted, mine has a standard exhaust. The baseline reading for both cars was within 1bhp of each other (399bhp). After a little work though, his was an adjusted 425, mine was 415.

The engineers reconed the difference was a combination of the fuel quality and the Akrapovic....

At Spa the next day, running identical fuel, there was literally nothing between the cars on the Kemmel straight.
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Disco
Estoril


Joined: 13 May 2008
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2010 Porsche 997 GT3

PostPosted: Tue Dec 20, 2016 6:26 pm    Post subject: Reply with quote

Roro wrote:
Actually yes good point re colder air. Indeed it was colder outside, but Charlie did close the doors and put the fan on, I presume (now) partly in an attempt to replicate the conditions of the previous test which was saved on his systems. So maybe it wasn't much colder than the previous test after all. Also tyres were the same (I thought they were different but I checked and they're the same MPSS I used last time)


The air of late hasn't just been cold, but also damp and that has an effect on the charge going into the engine too.
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kingston
Österreich


Joined: 09 Jun 2010
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PostPosted: Wed Dec 21, 2016 10:02 pm    Post subject: Reply with quote

So what your saying is that Roro's cars still broken?

Ive got the vod footage somewhere showing Roros lil face seeing the dyno read out Evil or Very Mad
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Roro
Long Beach


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PostPosted: Wed Dec 21, 2016 11:14 pm    Post subject: Reply with quote

I'm happy with my new dyno readings Cool
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Y2K
Nürburgring


Joined: 08 Mar 2016
Posts: 447
Location: Hampshire


PostPosted: Mon Sep 17, 2018 5:19 pm    Post subject: Reply with quote

Booked mine in at SRR on Sat 29th Sept.

Anyone else interested?
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LaSource
Nürburgring


Joined: 08 Feb 2009
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PostPosted: Mon Sep 17, 2018 7:20 pm    Post subject: Reply with quote

Y2K wrote:
Booked mine in at SRR on Sat 29th Sept.

Anyone else interested?


Hmm I do need to visit Charlie with the XBow plus take a friend with a manthey 996 GT3
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Previous:
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2x 997 GT3 RS 4.0 White and White
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2x 996 GT3 RS Blue and Red
2x 996 GT3 Mk2 Clubsport and Comfort
 
  
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Y2K
Nürburgring


Joined: 08 Mar 2016
Posts: 447
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PostPosted: Mon Sep 17, 2018 7:42 pm    Post subject: Reply with quote

11:30 & 11:45 for mine and my friend’s slots. Thumb
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Y2K
Nürburgring


Joined: 08 Mar 2016
Posts: 447
Location: Hampshire


PostPosted: Wed Oct 10, 2018 6:32 am    Post subject: Reply with quote


Open Youtube Page


Standard engine, with 2/3 Esso and 1/3 V-Power

403.3 bhp & 314 lb/ft
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LaSource
Nürburgring


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PostPosted: Wed Oct 10, 2018 6:44 am    Post subject: Reply with quote

Yep - healthy engine. Same as what mine would get.
996's are punchy.
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997 GT3 RS 3.8 Grey/Red
996 GT3 Mk2 Clubsport Guards Red
KTM XBOW RR Superlight Spec
BMW E39 M5, BMW E46 M3
Land Rover Discovery 4 HSE

Previous:
981 GT4 3.8 Clubsport
2x 997 GT3 RS 4.0 White and White
2x 997 GT3 RS 3.8 RHD and LHD
2x 996 GT3 RS Blue and Red
2x 996 GT3 Mk2 Clubsport and Comfort
 
  
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Y2K
Nürburgring


Joined: 08 Mar 2016
Posts: 447
Location: Hampshire


PostPosted: Wed Oct 10, 2018 7:41 am    Post subject: Reply with quote

Yeah very consistent with other mk2s. Thumb
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