G Tech

[ADY1983]

Thats the one. I'll be interested to see what its final price is though.

Well it did have a buy it now but someone has stuck a bid in since my last post.. I am guessing it was a good price @ £50?

 

[pammy]

is kerb weight the same as unladen weight?

What I've found for Edna shows 1405 kg Kerb weight. Sounds about right?

Can anyone read the certificate of conformity? That's got a couple that look likely candidates But I don't do German either line 14.1 - 1665kg or 12.1 1445kg look likley

 

[R2D2]

1445 will be the unladen weight and the 1665 is the gross weight or maximum laden weight. HTH

 

[DITTRICH]

A reasonable explanation of the measurement of "power" including H.P. is given below - scroll down to the power section.

http://www.projects.ex.ac.uk/trol/dictunit/notes2.htm

I would assume that the little black box calculates the power required to accelerate the car from rest. The little black box is given the mass (kg) of the car. It measures acceleration from rest and time so it can calculate the final speed and distance travelled.Accelerate 2,000kg of metal, skin and bones from 0 - 27.78m/s (100kmph) in 8 seconds...

Acceleration = 27.78/8 = m/s2 = 3.48 m/s2
Distance Travelled S = 0.5at2 = 0.5 x 3.48 x 8.0 x 8.0 = 111.36m
Force = ma = kgm/s2 = 2,000 x 3.48 = 6,960newtons
Work Done = Force x Distance = 6,960 x 111.36 = 775,065.60 Joules
Power = Work Done / Time = 775,065.60 / 8.0 = 96,883.2 Joules / sec = Watts or 96.8832KW where KW is kilowatts.
Convert from KW to HP roughly multiply by 1.34 (obtained off the web)
96.8832kw x 1.34 = 129.83hp
Notice the result did not require any information on rpm or anywhere else. All it needed was the mass kg (input by you), time and the acceleration (calculated by itself).
Now I admit it is years since I did O level physics - but I'm pretty sure this is how the little black box works.
All this gubbins about transmission losses...well it is possible to calculate the energy released by burning petrol and to measure the amount of fuel consumed over several 'runs' by brimming the tank. But this is another story not for today. I should point out that this extra calculation does not calculate the transmission losses, which is only part of the energy 'lost' - the calculation calculates total energy losses including all the hot air escaping out the back and heat transferred away by the radiator! The more subjective bit is deciding what is lost 'in the engine' and 'in the transmission'.
Regards
Les

 

[scumbag]

It has arrived

Mark - if you want to meet up - then let me know and we'll sort sommat. Dunno if Portzy's around atm.

Any ideas where I could get Edna weighed? Can't find a public weighbridge around here Might only be able to get 0-60 figures etc.

I was thinking of using the A168 up by the side of A1 - off the A59 - is a brilliant road as it's quite wide but very well surfaced

not sure where that road is. I have saturday evening or all day sunday and I found it this afternoon all day Monday free now.

and i deleted you phone number as I am right good with my phone I am.

I think Portzy is in scarborough repairing the sea defences! How long have you got the kit for?

 

[R2D2]

The G tech acturately works out the above but it gives you the actual power required to provide the performance it measures therefore the figure it provides is at the wheels and is therefore more relevant than the crank figure. However, having had 5 goes on three different rolling roads with two different Mercedes and having studied and discussed the losses issue with loads of people, a rule of thumb (nothing more before I get shot) is 18% losses on a manual box and 22% on an auto. Therefore G tech actually measured 160bhp at the wheels on my car which = 160/78 x 100=205bhp were the losses only 18% (manual box)= 160/82 x 100= 195bhp.

It doesnt matter if you use a dyno or a g tech all you actually measure is the rear wheel figure and therefore one could argue all night about if for instance my car is 195bhp or 205bhp but it doesnt matter because 160bhp at the wheels is sure one heck of a lot higher than 143bhp at the crank which is what a stock c180 has

For the sake of uniformity how about we just all apply 18% for manuals and 22% for autos.

This gives me 205bhp and Grav a barnstorming 425bhp
Does any one know what Pammys slk 320 is meant to produce??

 

[pammy]

not sure where that road is. I have saturday evening or all day sunday and I found it this afternoon all day Monday free now.

and i deleted you phone number as I am right good with my phone I am.

I think Portzy is in scarborough repairing the sea defences! How long have you got the kit for?

I'd like to send it back on Monday if I can so if we could arrange for Sunday that would be great. I'll pm you my number - again!!

 

[pammy]

Does any one know what Pammys slk 320 is meant to produce??

About 215

 

[pammy]

not sure where that road is. I have saturday evening or all day sunday and I found it this afternoon all day Monday free now.

and i deleted you phone number as I am right good with my phone I am.

I think Portzy is in scarborough repairing the sea defences! How long have you got the kit for?

I think it might have a slight incline actually - I'm going over in the morning anyway to Hammerton to look at a house - I'll check it out then.

Penny Pot Lane might be bothered with bikers(of the pedalled variety) and the like on Sunday

 

[R2D2]

If its a slight incline then do runs in both directions and average them, shame we cant borrow Millbrooks measured flat mile!

 

[scumbag]

I think it might have a slight incline actually - I'm going over in the morning anyway to Hammerton to look at a house - I'll check it out then.

Penny Pot Lane might be bothered with bikers(of the pedalled variety) and the like on Sunday

It mite you are right. I think that a portion just after the camp should be okay for a bit of the testing tho. you only need the 1/4 mile to be level. I will bring the video camera and film you looning about.

as for peddal cyclists! are they have a fun run on bikes up there? Bloody nuisances these bycyclists. you build then cycle lanes and be honest! how many times have you seen them in use eh? I ask you? disgrace, they should be shot. We just want a bit of harmless fun on one afternoon, and we are not bothering anyone tyring to establish figures for our cars, and theses so called doogooders come along and want the give the countryside back to whom it belongs. How am i supposed to enjoy it without my car eh?


rant rant etc etc

 

[pammy]

It mite you are right. I think that a portion just after the camp should be okay for a bit of the testing tho. you only need the 1/4 mile to be level. I will bring the video camera and film you looning about.

as for peddal cyclists! are they have a fun run on bikes up there? Bloody nuisances these bycyclists. you build then cycle lanes and be honest! how many times have you seen them in use eh? I ask you? disgrace, they should be shot. We just want a bit of harmless fun on one afternoon, and we are not bothering anyone tyring to establish figures for our cars, and theses so called doogooders come along and want the give the countryside back to whom it belongs. How am i supposed to enjoy it without my car eh?


rant rant etc etc

PMSL

 

[stats007]

You may also want to read this.

 

[R2D2]

Pammy, you got the instructions sorted yet

 

[pammy]

Pammy, you got the instructions sorted yet

Yeah - piece o' cake

Gonna have a good read in a bit. Looks simple enough though - she says optimisticaly

 

[R2D2]

When you get the thing set level and it shows 0.00 breathing makes it go + or -.

 

[scumbag]

I was thinking of using the A168 up by the side of A1 - off the A59 - is a brilliant road as it's quite wide but very well surfaced

Maps are a wonderful invention. one day they will take the place of SatNavs, no power requieed for them, they dont get confused by speed, rounabouts or one way streets.

Found it. looks a good idea that does. another adventure coz i am sure i have never been up that bit before.

 

[pammy]

Maps are a wonderful invention. one day they will take the place of SatNavs, no power requieed for them, they dont get confused by speed, rounabouts or one way streets.

Found it. looks a good idea that does. another adventure coz i am sure i have never been up that bit before.

Cool - we can go there then. Tis a good road

 

[R2D2]

As you know I took my car to a weigh bridge before testing and discovered that my car was a bit over the unladen book weight. Grav had been a fed up with his figures because the car didnt feel as fast as usual and was well off what he had hoped for.

Well, yesterday Grav took his car to the weigh bridge and to his horror discover that the 50 magnet in his boot had taken his car nearly beyound the maximum load for the car- like he shouldnt have any passengers. Anyway he topped the fuel back up to where it had been earlier in the week and weighed the car as tested with him in it and then without the magnets.

His car actually weighed 2235kg= 4917lbs 4917/3762 x 276= 360 at the wheels. 360/78 x100 = 462bhp!!

360bhp at the wheels and 462bhp estimated at the crank.

Obviously the 0-60 and 1/4 mile times will need done again ......with an empty boot

 

[pammy]

Graeme - you're officially a numpty