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[Webby the Bear]

Question ( can hear Taxi Al sighing )

If for arguments sake i feel my 0-60 tests (on my friends' private track aren't convincing me) and I wanted to test EXACTLY my car's power would the above be the best option? E.g. instead of me saying ''oooh it FEELS lacking'' or ''oooh it FEELS powerful''.

And would they be able to highlight where in the rev range there's a lack / enhancement of power?

As I've never been / seen / done one is there any forewarning things I should know about? Are they expensive? There a good franchise company that would be an option etc etc.

And finally if they say ''Right Mr. Bear, your car's producing 150bhp'' then due to the cars age is the drop off from original 170 expected due to age, or should it be there or thereabouts?

[05omegav6]

Sigh

Not worth the time of day... unless you are looking to tune it. In which case, you would have runs done before and after, using the same machine, with the same operator and ideally the same temperature and humidity.

And call me cynical, but if the people who run the dyno have any involvement with the actual tuning, then expect an improvement in the before/after figures as they will want to make their magic smoke look good, even if the car drives like a bag of poo afterwards

[Webby the Bear]

Sigh

Not worth the time of day... unless you are looking to tune it. In which case, you would have runs done before and after, using the same machine, with the same operator and ideally the same temperature and humidity.

And call me cynical, but if the people who run the dyno have any involvement with the actual tuning, then expect an improvement in the before/after figures as they will want to make their magic smoke look good, even if the car drives like a bag of poo afterwards

Ok, fair enough Al. May I ask why you think that? Surely it would be concrete evidence?

And no tuning intended (just checking stock performance)

 

[Broomies Mate]

Dyno'ing an Auto is always a waste of time.  I'll save you a few quid......

Think of a number of horses you would like your car to have,
Halve it,
Ta Da!!!!!! 

[Webby the Bear]

Dyno'ing an Auto is always a waste of time.  I'll save you a few quid......

Think of a number of horses you would like your car to have,
Halve it,
Ta Da!!!!!! 

 

Ooooooook! lol

The reason I ask.

The car has definitely improved. And yesterday took it for a blast and wow thought it was a new motor. Drove it todayand it seems fast in some places and not so in others. But I know it's not tangible to keep coming on here saying ''I think its down on power''.

I'm considering lending it to TB to see what he thinks........ 

[05omegav6]

Unless the dyno is properly calibrated and in a controlled environment, then it will only be an approximate guess as to what is going on tbh...

It will give you a torque curve and a power curve which will resemble reality. But in the main, 'public' dynos are usually set to flatter both the car owner and the tuner

The TB school of testing is probably the most reliable benchmark wrt Omegas

[Kevin Wood]

Not worth the time of day... unless you are looking to tune it.

This.

Dyno'ing an Auto is always a waste of time.  I'll save you a few quid......

And this.

There are so many ways to fiddle the results and so many muppets running rolling roads that it's a waste of time, IMHO. On a well calibrated set of rollers with a decent, honest operator, they might be useful to tune an engine for best power or to make comparisons before and after. To get an absolute power figure to compare with the manufacturer's spec, they are simply not accurate enough, IMHO. Much more so when the operator is trying to fight an automatic gearbox.

[Webby the Bear]

Ok, thanks for input boyos

Wondering where that leaves me then......... 

As said previously, its like a flat spot between 2k and 4k rpm.

Still got a hiss at the vacuum boxwhich is great (when I pull top hose off) but also still got a hiss at engine shut off.

[4x4]

Book a dyno session at jamsports near mataland and halfords,that will tell you power and torque.
Tweed road its on half way down on right

[chrisgixer]

Ok, thanks for input boyos

Wondering where that leaves me then......... 

As said previously, its like a flat spot between 2k and 4k rpm.

Still got a hiss at the vacuum boxwhich is great (when I pull top hose off) but also still got a hiss at engine shut off.

Imo, step 1, remove the large vac pipe connection from the side of the plenum and examine the whole length for holes. Unless done already...?

[omega3000]

Dyno'ing an Auto is always a waste of time.  I'll save you a few quid......

Think of a number of horses you would like your car to have,
Halve it,
Ta Da!!!!!! 

+1 

Take it to TB and ring its neck 

[Field Marshal Dr. Opti]

Question ( can hear Taxi Al sighing )

If for arguments sake i feel my 0-60 tests (on my friends' private track aren't convincing me) and I wanted to test EXACTLY my car's power would the above be the best option? E.g. instead of me saying ''oooh it FEELS lacking'' or ''oooh it FEELS powerful''.

And would they be able to highlight where in the rev range there's a lack / enhancement of power?

As I've never been / seen / done one is there any forewarning things I should know about? Are they expensive? There a good franchise company that would be an option etc etc.

And finally if they say ''Right Mr. Bear, your car's producing 150bhp'' then due to the cars age is the drop off from original 170 expected due to age, or should it be there or thereabouts?

Driver only, and with just a small amount of petrol in the tank, my 2.6 MV6 reached 60 MPH in 8.53 seconds......taking 136.92 metres.

Dead flat road....do discernable wind.

Two up and with a full tank of petrol it is lucky to break 10 seconds.

[Webby the Bear]

Ok, thanks for input boyos

Wondering where that leaves me then......... 

As said previously, its like a flat spot between 2k and 4k rpm.

Still got a hiss at the vacuum boxwhich is great (when I pull top hose off) but also still got a hiss at engine shut off.

Imo, step 1, remove the large vac pipe connection from the side of the plenum and examine the whole length for holes. Unless done already...?

Yep, done already Chris. Well, not removed but gave it a good feel.

The leak sounds like it's from plenum but obviously that's not conclusive.

And we know the new vac box has helped and is now working.

But still the hiss at shut off suggests another leak.

[chrisgixer]

Ok, thanks for input boyos

Wondering where that leaves me then......... 

As said previously, its like a flat spot between 2k and 4k rpm.

Still got a hiss at the vacuum boxwhich is great (when I pull top hose off) but also still got a hiss at engine shut off.

Imo, step 1, remove the large vac pipe connection from the side of the plenum and examine the whole length for holes. Unless done already...?

Yep, done already Chris. Well, not removed but gave it a good feel.

The leak sounds like it's from plenum but obviously that's not conclusive.

And we know the new vac box has helped and is now working.

But still the hiss at shut off suggests another leak.

Plenum seated correctly....? No trapped o rings? ....although that would be audible while running.


Can secondary air or other gubbins hiss after shit off.


Edit. Or even after shUt off

[Webby the Bear]

Ok, thanks for input boyos

Wondering where that leaves me then......... 

As said previously, its like a flat spot between 2k and 4k rpm.

Still got a hiss at the vacuum boxwhich is great (when I pull top hose off) but also still got a hiss at engine shut off.

Imo, step 1, remove the large vac pipe connection from the side of the plenum and examine the whole length for holes. Unless done already...?

Yep, done already Chris. Well, not removed but gave it a good feel.

The leak sounds like it's from plenum but obviously that's not conclusive.

And we know the new vac box has helped and is now working.

But still the hiss at shut off suggests another leak.

Plenum seated correctly....? No trapped o rings? ....although that would be audible while running.


Can secondary air or other gubbins hiss after shit off.


Edit. Or even after shUt off

Hahahahaha

Presumably a quick test would be to pull the SAI fuse?

Would a hissing SAI contribute to power loss? Or just thinking of things that it could be? Thinking about it it can't have a contribution but definitely worth ruling out.

Wondering if all o rings and intake gaskets ned replacing. I dunno