Dyno Dynamics Rolling roads
#1
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Monte Geek
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From: Cheshunt, Herts
Dyno Dynamics Rolling roads
Any good? or does it depend on the operator?
having my Monte on a one for a power run on sat
Any predictions? made 439bhp on the SCS dyno and has been run in and live mapped now by Ahmed
Would be happy with 400plus
having my Monte on a one for a power run on sat
Any predictions? made 439bhp on the SCS dyno and has been run in and live mapped now by Ahmed
Would be happy with 400plus
#2
I've mentioned to Chris Todd about sorting out an RR day soon....
He has this set-up. I dont mind doing the chasing, Im gonna go see him Friday to see if he wants to actually do it as it was just a brief mention when I last see him!
Up for it?
He has this set-up. I dont mind doing the chasing, Im gonna go see him Friday to see if he wants to actually do it as it was just a brief mention when I last see him!
Up for it?
#7
aka Turbosailorboy
iTrader: (5)
Very good rolling roads Paul If used in standard shoot out mode you should be able to get virtually the same results on any other set of Dyno Dynamics rollers.
Made by same company as Autronic
I reckon yours will make 430 bhp as long as the ambient temp is ok
Mine made 397 and i built it myself Although MSD did the mapping
Made by same company as Autronic
I reckon yours will make 430 bhp as long as the ambient temp is ok
Mine made 397 and i built it myself Although MSD did the mapping
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#11
Testing the future
Re: Dyno Dynamics Rolling roads
Originally Posted by Paul Ripley
Dyno Dynamics Rolling roads
Any good?
or does it depend on the operator?
Any good?
or does it depend on the operator?
yes
same as any other rolling road
#12
#1 in Spelling Club
iTrader: (14)
I depends on the operator and whether they chose to use the correct method to run the car. Standard Shootout mode must be carried out in 3rd gear and with the tyres at 50psi (though the tyre pressure isn't as important as the gear used).
Personally, I wouldn't use the engine dyno figure as the benchmark as engine dyno's aren't the be-all-and-end-all of measuring power. In theory, yes, but in practise, not so.
Personally, I wouldn't use the engine dyno figure as the benchmark as engine dyno's aren't the be-all-and-end-all of measuring power. In theory, yes, but in practise, not so.
#13
Testing the future
Originally Posted by Christian and Beccy
Personally, I wouldn't use the engine dyno figure as the benchmark as engine dyno's aren't the be-all-and-end-all of measuring power. In theory, yes, but in practise, not so.
here we go again. an engine dyno is the best thing for measuring engine power - that's what they were designed and built for believe it or not
a chassis dyno is the best thing for measuring power 'at the wheels' (barring tyre deformation on small rollers, strap down forces etc)
but you can only compare the 2 results if the conditions are exactly the same that includes things like having the same induction and exhaust systems, same barometric pressure, ambient temperatures, coolant circuit and temperature etc.
and most important of all on a forced induction engine is the same level of intercooling. and that is the thing that is usually the most different between an engine dyno (with perhaps a water cooled charge cooler keeping a constant temperature), a chassis dyno (with an electric blower) and the real world driving conditions on the road (airflow from forward movement of the vehicle).
if you were a proper mechanical engineer, you would understand these things
edit: not meant as having a go at you christian, as you are right about the practice bit just meant as general information
#14
Originally Posted by Christian and Beccy
I depends on the operator and whether they chose to use the correct method to run the car. Standard Shootout mode must be carried out in 3rd gear and with the tyres at 50psi (though the tyre pressure isn't as important as the gear used).
If you don't run tyres at 50 psi on the road, what relevance will it have?
#15
Testing the future
i guess that's to minimise the effect of tyre deformation on the rolling losses so that they have a standard to compare between all of the DD shoot out results.
as that is nothing like what happens on the road, who cares?
as that is nothing like what happens on the road, who cares?
#18
PassionFord Post Whore!!
Originally Posted by Christian and Beccy
Personally, I wouldn't use the engine dyno figure as the benchmark as engine dyno's aren't the be-all-and-end-all of measuring power.
think you may be wrong there christian as that is the sole purpose they are designed for, i should know as thats what i do for a living
If you are referring to how they perform in 'real life' then that has too many parameters to even think about. but if its the most accurate power figure you want for an Engine then it has to be an engine dyno
#20
my 2 penneth Ive run on a DD rolling road @ SCC I made 267bhp, I then ran at Track & Road http://www.tracknroad.com/ it runs within 1.5% of HT's Proper SF901 Superflow Engine Dyno http://www.dynoit.co.uk/ and I made 285bhp Both roads are regarded as accurate and are calibrated on each run..... Rob runs in 4th with tyres enflated and its a twin roller jobby where as T&Rs is a single roller device and they run in 5th but according to Clint Gaskin this is fine as its all based around the ability of you car to accellerate the known mass of the drum. At T&R they run the car up so the roller was exactly spinning at 60mph then press a button, which callibrates something I also ran at EA with no boost controller or manifold and made 295
as a joe public non techy I have no clue how much real power I have and am not bothering running on a RR anymore
DD
T&R
EA
as a joe public non techy I have no clue how much real power I have and am not bothering running on a RR anymore
DD
T&R
EA
#23
#1 in Spelling Club
iTrader: (14)
I agree that THEORETICALLY an Engine Dyno is the best way to measure power at the ENGINE. However, that's not to say that there are as many innaccurate engine dyno's as there are chassis dyno's. It is no different. I shall not be specific, but why do the results have to be gospel just because they were measured on an engine dyno? It may not have been properly calibrated to 10 years. Infact it is so much easier to 'fudge' the figures on an engine dyno, by altering any one of the many cell parameters that are controllable by the operator.
At least on a chassis dyno the car runs in its 'road trim', with all the ancillaries that it runs on the road. Not a dyno-specific exhaust, cooling system and so-on.
As said above, the 50psi thing is what DD have discovered to be the best pressure for consistency. Similarly, their system was designed to use 3rd gear, so we don't question it. Those who use 4th gear on a DD Dyno might aswell have not paid Dyno Dynamics prices and just gone for something cheaper as by altering the suggested methods, you are simply providing an inaccurate figure.
On the tests we have done, the car usually produces the expected figure in 3rd gear and, believe it or not, a lower figure in 4th!!
At least on a chassis dyno the car runs in its 'road trim', with all the ancillaries that it runs on the road. Not a dyno-specific exhaust, cooling system and so-on.
As said above, the 50psi thing is what DD have discovered to be the best pressure for consistency. Similarly, their system was designed to use 3rd gear, so we don't question it. Those who use 4th gear on a DD Dyno might aswell have not paid Dyno Dynamics prices and just gone for something cheaper as by altering the suggested methods, you are simply providing an inaccurate figure.
On the tests we have done, the car usually produces the expected figure in 3rd gear and, believe it or not, a lower figure in 4th!!
#25
#1 in Spelling Club
iTrader: (14)
Originally Posted by RichardPON
Why 3rd gear though, when 4th is usually 1:1?
I agree about the logic of 1:1, but DD say 3rd, so we use 3rd.
#26
PassionFord Post Troll
I would say it is not 3rd specifically that they are after but a given road speed due to friction/heat build up at higher road speed which may not be present so much on coast down.
A rally car may top out at 60 in 3rd where as a big engined road car may be doing over a ton so to just say 3rd is pointless.
Because i was told so is not really an answer i would want my RR operator to give. I would want them to know WHY.
A rally car may top out at 60 in 3rd where as a big engined road car may be doing over a ton so to just say 3rd is pointless.
Because i was told so is not really an answer i would want my RR operator to give. I would want them to know WHY.
#27
PassionFord Post Whore!!
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From: Northants
Originally Posted by Christian and Beccy
At least on a chassis dyno the car runs in its 'road trim', with all the ancillaries that it runs on the road. Not a dyno-specific exhaust, cooling system and so-on.
As said above, the 50psi thing is what DD have discovered to be the best pressure for consistency. Similarly, their system was designed to use 3rd gear, so we don't question it. Those who use 4th gear on a DD Dyno might aswell have not paid Dyno Dynamics prices and just gone for something cheaper as by altering the suggested methods, you are simply providing an inaccurate figure.
On the tests we have done, the car usually produces the expected figure in 3rd gear and, believe it or not, a lower figure in 4th!!
And yes, I do believe you when you say 4th gear would give a lower reading (gearbox = torque multiplier)
#28
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From: NORWICH
dd say that 3rd is normal gear used as peak power should be made between 60-85mph as this is the most accurate window
tyres are run at 50psi to give consistent readings for dyno days and prevent tyre damage while mapping
tyres are run at 50psi to give consistent readings for dyno days and prevent tyre damage while mapping
#30
How do you run big horsepower rear wheel drive cars?
There is no way my car would grip being run in 3rd on a DD rolling road.
Mine wheels spins in 4th on AVA's and were are testing power at 150 mph at the top of 4th gear.
There is no way my car would grip being run in 3rd on a DD rolling road.
Mine wheels spins in 4th on AVA's and were are testing power at 150 mph at the top of 4th gear.
#31
PassionFord Post Whore!!
Originally Posted by SteveB
Originally Posted by B9KOS
Made by same company as Autronic
Who told you that????
Mark
#32
10K+ Poster!!
iTrader: (3)
Originally Posted by rapidcossie
How do you run big horsepower rear wheel drive cars?
There is no way my car would grip being run in 3rd on a DD rolling road.
Mine wheels spins in 4th on AVA's and were are testing power at 150 mph at the top of 4th gear.
There is no way my car would grip being run in 3rd on a DD rolling road.
Mine wheels spins in 4th on AVA's and were are testing power at 150 mph at the top of 4th gear.
I've seen 800bhp (Supra) on DD's rollers with NO spinning and no people sitting in the boot wasting their time compressing the suspension
#33
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From: NORWICH
personally ive got skyline's gts's running around 450bhp at wheels though rear wheels and they are run in 3rd
my evo makes 480bhp at wheels run in 3rd
plus christians is run in 3rd too!!
but world wide there are loads of cars that are run with no spin!!
my evo makes 480bhp at wheels run in 3rd
plus christians is run in 3rd too!!
but world wide there are loads of cars that are run with no spin!!
#34
Originally Posted by SteveB
Originally Posted by rapidcossie
How do you run big horsepower rear wheel drive cars?
There is no way my car would grip being run in 3rd on a DD rolling road.
Mine wheels spins in 4th on AVA's and were are testing power at 150 mph at the top of 4th gear.
There is no way my car would grip being run in 3rd on a DD rolling road.
Mine wheels spins in 4th on AVA's and were are testing power at 150 mph at the top of 4th gear.
I've seen 800bhp (Supra) on DD's rollers with NO spinning and no people sitting in the boot wasting their time compressing the suspension
#37
10K+ Poster!!
iTrader: (3)
Originally Posted by rapidcossie
Originally Posted by SteveB
Originally Posted by rapidcossie
How do you run big horsepower rear wheel drive cars?
There is no way my car would grip being run in 3rd on a DD rolling road.
Mine wheels spins in 4th on AVA's and were are testing power at 150 mph at the top of 4th gear.
There is no way my car would grip being run in 3rd on a DD rolling road.
Mine wheels spins in 4th on AVA's and were are testing power at 150 mph at the top of 4th gear.
I've seen 800bhp (Supra) on DD's rollers with NO spinning and no people sitting in the boot wasting their time compressing the suspension
Your question was..... "How do you run big horespower RWD cars"
To which I answered with the RWD Supra
#38
Originally Posted by SteveB
Originally Posted by rapidcossie
Originally Posted by SteveB
Originally Posted by rapidcossie
How do you run big horsepower rear wheel drive cars?
There is no way my car would grip being run in 3rd on a DD rolling road.
Mine wheels spins in 4th on AVA's and were are testing power at 150 mph at the top of 4th gear.
There is no way my car would grip being run in 3rd on a DD rolling road.
Mine wheels spins in 4th on AVA's and were are testing power at 150 mph at the top of 4th gear.
I've seen 800bhp (Supra) on DD's rollers with NO spinning and no people sitting in the boot wasting their time compressing the suspension
Your question was..... "How do you run big horespower RWD cars"
To which I answered with the RWD Supra
#39
If I remember, for that sort of car - i.e loads of power, and shit suspension, don't DD have some sort of lever bar setup?
If Mike still used the board, he'd be able to answer all these questions....
If Mike still used the board, he'd be able to answer all these questions....
#40
10K+ Poster!!
iTrader: (3)
Originally Posted by rapidcossie
Originally Posted by SteveB
Originally Posted by rapidcossie
Originally Posted by SteveB
Originally Posted by rapidcossie
How do you run big horsepower rear wheel drive cars?
There is no way my car would grip being run in 3rd on a DD rolling road.
Mine wheels spins in 4th on AVA's and were are testing power at 150 mph at the top of 4th gear.
There is no way my car would grip being run in 3rd on a DD rolling road.
Mine wheels spins in 4th on AVA's and were are testing power at 150 mph at the top of 4th gear.
I've seen 800bhp (Supra) on DD's rollers with NO spinning and no people sitting in the boot wasting their time compressing the suspension
Your question was..... "How do you run big horespower RWD cars"
To which I answered with the RWD Supra
Lol gotta agree there
I've seen a few big bhp RWD cars run and none have had any probs, even this week saw a 440bhp 3dr run at SCC with no probs. The DD rollers have a trick system to hold down big power cars