To Dyno? Or Not To Dyno?

[20B_boy]

As the big man says really, they\'ll wind her up slowly into 3rd or 4th then nail her up just past peak power, as soon as the curve flattens out they\'ll let off, repeat cycle and yer done. Print graphs, head off to pub to see Danny the fish

[John Yorke]

A dyno is the safest way of checking out the health of your engine, make sure you have good plugs, clean oil and your coolant is ok, take it to a GOOD dyno as 20bboy says dyno pack or dyno dynamics are the better ones, make sure that the garage are FD frendly and they understand the fueling on them [they run somewhat richer than yer boingers!].
Dyno pack will give you your actual RWHP, Dyno dynamics will give you the real figures -allowing for loss of traction through wheelspin ect.
I have had 2 mappin sessions [1/2 day or so] and 2 power runs [just to proove the figures] without any problems - trouble is it makes you hungry for more power:D
Get it on there if only to keep the rabble quiet and it would be good to have some PROVEN 400+ cars at meetings and not pub talk figures:bandit
John

[Carl]

The kindest way to run on a dyno is the Dyno Hub like what Abbey have.It is very accurate on repeat runs and much kinder on the car than rolling road dynos.
Also it is possible to work out the flywheel figure and Hub figure for power output.
Having worked on both types of Dyno my choice would always be the dyno hub for kindness and repeatability of runs within one or two hp.This is more important when you are tuning than just getting a power run.
Kind regards
Carl

[20B_boy]

Ask John about consistency of runs on the Dyno Dynamics!

[John Yorke]

Yep as Rich A says 4 runs last Tuesday and the last 2 at my mappin session all within .2hp. :cool
I think if you are after just a power run either dyno will do......As far as tuning goes you have to rely on your chosen tuner.
Just my .2hp\'s worth
Regards John [316RWHP + a happy bunnie!]:wave

[20B_boy]

I imagine the dynapak is very accurate and repeatable. But the Dyno Dynamics RR are also very well respected around the world.

I personally would prefer power runs done on rollers as you\'re reading from the treads, for tuning I dont really think it matters that much from the little I\'ve seen, both I\'m sure are more than adequate at loading up the car as required - and as John says the DD certainly appears to be accurate at Guy\'s shop at least.

I\'m sure Danny has some thing to say now ;-) Whats was that Danny? a pint of stella and a packet of Big D\'s? Nothing wrong with pub talk!

[GaryS]

IMHO comparing dyno figures from two different dynos is a complete and utter waste of time.  Even weather and time of year can affect the results.

It is nice to compare results with other cars at the same session, but that\'s really as far as it goes.

Dynos are reallty useful for tuning your car and trying to identify faults, however if you want to keep a historic track of your car\'s output , you have to use the same place for each run.

[gsb876]

Robertio - careful kid i\'m looking for well over 400bhp so if i did decide to come up there you might have to pay!!;)

Seriously though it sounds as though its not too tough on the car taking it to a dyno session, i\'ll wait until Scoobi Si gets his rx sorted then we\'ll go down and see what happens, couple of weeks or so i reckon so keep em peeled.

I guess its all elementary now as the Japvillage car is on the streets?:mad:  and not too far from me:(

Well sort of:wave

[iaint]

Originally posted by GaryS
IMHO comparing dyno figures from two different dynos is a complete and utter waste of time.  Even weather and time of year can affect the results.

A decent setup should baseline results to a certain temperature and air pressure (or be capable of it).  Obviously in high-pressure cold weather there\'ll be more power then low pressure warm weather.

Plus at the wheels HP figures should be comparable between dynos assuming there\'s not a huge amount of wheel slip on the rollers (for a rr dyno).  HP at the hubs will be higher than rollers as there\'s a large amount of power lost in the tyres.  Fly wheel will be largest but without using an engine dyne fly wheel hp is guesswork.

So comparing HP on different types of dyno (engine, hub, wheel) is pointless comparisons between the same type of dyno should be within a few %.

Iain

[scooby_si]

uh oh am i guna get blamed for you not being able to back up yer talk now lol
Si (rollin rollin rollin keep them erm wheels rolling....)

[gsb876]

SI ,

i think the weathers gonna be ok for sunday so i\'ll take yer out for a blast see what you think?

I\'ve got it on good info that its gonna be over 400bhp easy so we shall see, if not may look for a more powerful one!!!

The RX

[jay]

Just ou tof interest what is the spec on your FD?
 Cheers Jay...:wave

[gsb876]

Jay,

i presume you\'re talking to me?

Not sure of the full spec but i have a bridgeported engine running a T78 turbo with internal boost controller and a huge front mount intercooler with limited slip diff, can\'t tell you the tech stuff as i dont know:confused: :rollin

Rear tyres are 265\'s so hopefully lots of grip???

Heres a pic of the engine bay:

[Robertio]

Originally posted by gsb876
Robertio - careful kid i\'m looking for well over 400bhp so if i did decide to come up there you might have to pay!!;)

There\'s 450bhp and there\'s 450bhp on a Maha rolling road - running a similar setup to Johns 316rwhp (approx 380fly) I made 279fly.  Until I run my car at G-Force we wont know the exact correlation between them, but the other rollers I used up here read about 40rwhp higher.  
To the best of my knowledge no FD has made over 300bhp on a Maha setup in Europe.

All the best

[gsb876]

"maha rolling road"

Not sure what that is dude? but you seen the pink jap village rx? possibly running close to 900bhp!!! i reckon that would get over 300bhp on the "maha rolling road thingy".

What is that btw?:confused: