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Old 6th August 2008, 11:46   #46
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Quote:
Originally Posted by deepakhon View Post
...Do you need this data on the average drivetrain loss even to get the 0-60mph results or only to calculate the horse power at the driving wheels?
As taddu said, weight is only required for the HP figures. Drivetrain loss is not actually required... read on.

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Originally Posted by pramods View Post
... can anybody please let me know the average drivetrain loss for Opel Corsa 1.4?...
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Originally Posted by deepakhon View Post
...For example, for Palio 1.2 NV ELX, what is the average drivetrain loss?
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Originally Posted by pramods View Post
...I read in review section that the average losses are in range of 12-17% but not sure if this is true for our cars.
As you said, in general people say losses could range anywhere from 10-20%. (Actually some even say 2-3%)
But that is a topic for much interesting discussion. (I would like to start a seperate thread on that soon).

However, what really matters to the cars performance is the wheel horse power (WHP) - which is the power that is actually put down on the road (measured with a chassis/rolling-road type dyno).

Now the good news is :
The iPhone + Dynolicious can measure WHP more accurately (than the dynolicious engine HP) and you do not need to mention any transmission loss % !

- If you do not enter any value for "drivetrain loss" it will show you the RWHP. (Cool. This is the *usable* horsepower)
- If you enter a percentage, it will (increase the hp figure and) show you the estimated HP at the crank.

cya
R

Last edited by Rehaan : 6th August 2008 at 13:26.
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Old 6th August 2008, 12:11   #47
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Quote:
Now the good news is :
The iPhone + Dynolicious can measure WHP more accurately and you do not need to mention any transmission loss % !

- If you do not enter any value for "drivetrain loss" it will show you the RWHP. (Cool. This is the *usable* horsepower)
- If you enter a percentage, it will (increase the hp figure and) show you the estimated HP at the crank.
I still don't see how this is possible.

If we were to take a stock Vtec with 175mm tyres and compare it another vtec with 205mm tyres, short/close ratio gearbox and a lightened chassis, the i-phone will tell you that the modified vtec is producing way more WHP than the stock car. AFAIK, all these mods can only improve performance but not "WHP".

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Old 6th August 2008, 12:35   #48
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Quote:
Originally Posted by Shan2nu View Post
If we were to take a stock Vtec with 175mm tyres and compare it another vtec with 205mm tyres, short/close ratio gearbox and a lightened chassis, the i-phone will tell you that the modified vtec is producing way more WHP than the stock car. AFAIK, all these mods can only improve performance but not "WHP".

Shan2nu
I guess you are right. But, what good is the power generated by the 175mm tire vtec if you cant put it down.

In the words of our good friend, what good is the most powerful car in India if you cant put it down on the road?

I would say in this case, software/hardware like the iPhone, GTech and the V-Box, in increasing order of accuracy(probably) actually reflects the how car moves. Unlike the dyno figures, which would indicate a "paper tiger" which wont move on the road?
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Old 6th August 2008, 12:44   #49
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Quote:
I guess you are right. But, what good is the power generated by the 175mm tire vtec if you cant put it down.
See thats a diff point. Like Rehaan mentioned, thats "usable horsepower".

But when you say "wheel horsepower" it should remain constant unless there is any change in the intake, exhaust, ecu settings, internals of the engine etc...

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Old 6th August 2008, 13:27   #50
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Quote:
Originally Posted by Shan2nu View Post
I still don't see how this is possible. ...
Shan,

As we have agreed earlier, the HP figure is very very rough compared to the other figures.

I have edited my post above to make what i was trying to say a little clearer (added the part in bold)

Quote:
The iPhone + Dynolicious can measure WHP more accurately (than the dynolicious engine HP) and you do not need to mention any transmission loss % !
Hope thats clearer.
cya
R
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Old 8th August 2008, 11:28   #51
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Another link from Gizmodo, but this has an crappy youtube video with lots of ads in it.

$13 iPhone App Faces Off Against, Embarrasses $150 Dedicated Dynometer
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Old 13th August 2008, 02:14   #52
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Today it had stopped raining for a while so had some runs on my mondeo, was finding to lauch the car properly,maybe time to change the clutch.

FORD MONDEO

0-60 =9.6s

1\4 mile = 16.8s ,
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Old 15th August 2008, 02:11   #53
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Originally Posted by srijit View Post
Another link from Gizmodo, but this has an crappy youtube video with lots of ads in it.

$13 iPhone App Faces Off Against, Embarrasses $150 Dedicated Dynometer
Thanks for the vid.

Did anyone notice that they did not mount the iphone as suggested by dynolicious!? (It was almost at a 45* slant!)

Anyway, theres no arguing that this program is worth $13.

cya
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Old 15th August 2008, 10:07   #54
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I am just waiting for Installer.app to appear on firmware 2.xx and also for some programs to arrive before I upgrade
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Old 16th August 2008, 12:14   #55
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The Apple Store has a new version with Mesurements in Metric and other improvements like application stability ect...

I just got it.
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Old 16th August 2008, 17:47   #56
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I just got it !

Now to test it!!
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Old 18th August 2008, 13:01   #57
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Strange results for my Safari, though I was fiddling around with this thing to start with, not knowing when I should accelerate or whether I need to press a button as I accelerate:

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Old 18th August 2008, 13:27   #58
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Quote:
Strange results for my Safari
Yeah, this is really wierd.

You did 0-60 in 11.4 secs, 60-100 in 4.8 secs and 100-140 in 5.7 secs!!!

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Old 18th August 2008, 13:32   #59
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Quote:
Originally Posted by Shan2nu View Post
Yeah, this is really wierd.

You did 0-60 in 11.4 secs, 60-100 in 4.8 secs and 100-140 in 5.7 secs!!!
Yeah I know the truck is slow off the blocks but really takes off past 60kmph - especially with the DimSports Tuning box, but I didnt (and still dont) think that it will take off that fast!

I will believe a 17 sec 0-100, but I cant stomach the 3.63 secs for 0 - 10!!!

Last edited by Steeroid : 18th August 2008 at 13:41.
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Old 18th August 2008, 13:54   #60
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Quote:
I will believe a 17 sec 0-100, but I cant stomach the 3.63 secs for 0 - 10!!!
Not just that, 100-140 in 5.7 secs is quicker than even a Skoda RS. It's something you'd expect from an S2000.

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