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Re: heartbreaker thursday [Re: ] #1359628
12/07/2012 16:17
12/07/2012 16:17

K
Kenno
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Kenno
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K



Had an RSR, but then sold all the bits (got cold feet prior to going forged).

She's standard again now.

Re: heartbreaker thursday [Re: ] #1361736
20/07/2012 19:48
20/07/2012 19:48
Joined: Dec 2005
Posts: 5,405
Castle Combe
Flea Offline
Forum is my life
Flea  Offline
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Castle Combe
Something to think about for the 5 pot guys the next time they go on a "heartbreaker" Dyno Dynamics. I have to say, for what is often lauded as one of the most accurate dynos, it's amazing how inaccurate it can be just because the settings are not right. Don't even ask me about what gear it should be run in, otherwise you might see 10-20bhp difference rolleyes


[Linked Image]

Re: heartbreaker thursday [Re: ] #1361780
20/07/2012 22:10
20/07/2012 22:10

B
Biggenz
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Biggenz
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Everyone else seems to think that Surrey RR is one of the most accurate dyno's, including the Supra boys and even other tuning companies in the area with their own dyno's!

Re: heartbreaker thursday [Re: ] #1361785
20/07/2012 22:19
20/07/2012 22:19
Joined: Feb 2007
Posts: 3,486
London Tan
technics Offline
I need some sleep
technics  Offline
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Joined: Feb 2007
Posts: 3,486
London Tan
That is interesting though.

So Flea what have you and your guys been doing on the rollers you use?

Biggenz, I wonder what Charlie has been doing though down at SurreyRollingRoad? Not many 5 pots around really, so I wonder....


Now in the 400+ bhp club!
Re: heartbreaker thursday [Re: ] #1361788
20/07/2012 22:21
20/07/2012 22:21

B
Biggenz
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Biggenz
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What does the 5 cylinder engine have to do with anything, or am I missing something?

Re: heartbreaker thursday [Re: ] #1361791
20/07/2012 22:25
20/07/2012 22:25
Joined: Feb 2007
Posts: 3,486
London Tan
technics Offline
I need some sleep
technics  Offline
I need some sleep

Joined: Feb 2007
Posts: 3,486
London Tan
Did you read the link above on settings?


Now in the 400+ bhp club!
Re: heartbreaker thursday [Re: ] #1361808
20/07/2012 22:40
20/07/2012 22:40

M
MickeyBravo20v
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MickeyBravo20v
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M



so in order to get a good reading from 1 of these dyno's,do 2 runs 1 in 4 pot mode and the other in 6 pot mode,then average the 2?

Re: heartbreaker thursday [Re: ] #1361810
20/07/2012 22:44
20/07/2012 22:44

B
Biggenz
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Biggenz
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Ok, there was a marginal difference with the different settings. 20bhp. My car was down 60bhp!

Which ever way you look at it, you could never tell whether a dyno is accurate or not. Only when you use an engine dyno, but a lot of people/tuners take their cars to Surrey RR and everyone I've ever spoken to says it's very close.

Re: heartbreaker thursday [Re: ] #1361813
20/07/2012 22:51
20/07/2012 22:51
Joined: Feb 2007
Posts: 3,486
London Tan
technics Offline
I need some sleep
technics  Offline
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Joined: Feb 2007
Posts: 3,486
London Tan
Yeah I always hear its a pretty accurate dyno too.
A few people say about these Maha dynos, I think there is one near Crawley/Gatwick way. Maybe one day.....


Now in the 400+ bhp club!
Re: heartbreaker thursday [Re: ] #1361816
20/07/2012 22:58
20/07/2012 22:58

B
Biggenz
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Biggenz
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B



If you're talking about Austec Racing, they have actually replaced their Maha dyno with a Dyno Dynamics one!

When I spoke to them, they said their dyno is not there for giving people the 'feel good factor', but for accurate results. They even said that Charlie's dyno over reads!!

Re: heartbreaker thursday [Re: ] #1361826
20/07/2012 23:44
20/07/2012 23:44
Joined: Feb 2007
Posts: 3,486
London Tan
technics Offline
I need some sleep
technics  Offline
I need some sleep

Joined: Feb 2007
Posts: 3,486
London Tan
Lol, over reads, blimey! That dyno dynamics probably sounds like the happy medium then!

Last edited by technics; 20/07/2012 23:45.

Now in the 400+ bhp club!
Re: heartbreaker thursday [Re: technics] #1362517
24/07/2012 10:50
24/07/2012 10:50

G
group5lancia
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group5lancia
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I found New Fixed Ramp Rate this about Dyno Dynamic ramp rates.

It should be remembered that that any dyno which plots torque/power against RPM has to use some ramp rate (i.e. rate of change of engine speed) in order to produce a plot, and therefore any such plot is always going to be somewhat artificial.

But having use a Dyno Dynamics rolling road for mapping myself, when the rollers are set to hold a given RPM so that fuel/ignition can be set against engine load/throttle position/boost I can tell you that the levels of torque and power achieved by an engine under that situation are always higher than in 'shoot' mode . This is simply because the engine is loaded to the point where it can't accelerate, which is where maximum output is achieved for any given engine speed.

A plot of torque/bhp against engine speed made up of all points measured in the 'rpm held' state used for mapping gives the highest output figures. It would be fair to say that the engine output shown would be accurate whilst at the same time not being 'real world' - i.e. in the real world you would expect the car to be accelerating at some rate at wide open throttle from x rpm through to y rpm. The different 'shoot modes' offered by Dyno Dynamics are analogous to measuring the engine power on the road, but by driving up hills of different gradients.

Going back to the link posted by Flea, the RS when running in 6 cylinder mode was shown to be producing more power than in 4 cylinder mode, which indicates that the loading on the rollers is higher in 6 cylinder mode giving a slower ramp rate. There is nothing wrong about the 347bhp figure - it is not the dyno adding some artificial power to what the engine is putting out. However, it may be that the engine would not deliver that in the real world when accelerating on the flat with little aero drag (i.e. in 1st, 2nd and maybe 3rd gear) but would going up a steep hill (in any gear) and at higher road speeds where aero drag is significant.

Last edited by group5lancia; 24/07/2012 11:22.
Re: heartbreaker thursday [Re: ] #1364868
02/08/2012 21:25
02/08/2012 21:25

H
h2ypr
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h2ypr
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H



Would it be safe to say that all Dyno Dynamic dyno's are calibrated the same or similar?

Ross

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