DYNO RESULTS

[Guest MK1gaz]

A 4WD rally special will kiss goodbye to ANOTHER 100+ bhp from it's fancy diffs and extra cogs to turn

 

Gaz you cant really say "100+" bhp" ... it has to be a percentage .. an no " + " .. whats a plus .. with your + after every figure you say.. you may as well say you have 1+bhp you'll always be right then

 

take a 1000bhp 4x4 ... it looses 100bhp

take a 150 bhp 4x4 .. it looses 100bhp

 

dont think so

 

Your car loses 17.77777 % of its power through the trans .. which is good .. very good.. i normally calculate it at around 20% trans losses .. as a ballpark fig for a RWD car.

The more power you make the more the transmission losses will be . I was talking about the 400 bhp 4wd turbo rally special that Razorsedge used in his original example . It will lose 100+ bhp (so at least a 100 bhp ) by the time it reaches the wheels . If it had 500 bhp then it would lose even more than 100 bhp so that's still a 100+ bhp isn't it

[Retromotorsport]

 

exactly Gaz.. its a percentage ... its not a figure like 100bhp+

 

10 % of 100 is 10... 10 % of 500 is 50 ... simple maths really ..

 

so the more power you make, the more you loose ... i never dissagreed with you on that.. just that fact that saying 100+ is pointless ... so you may as well say 1bhp+ .. it has no real quantity ..

 

 

Toby.. how did i work out Gaz lost 17.77777% of his power to the tansmission.. very very simple .. He made 'X' at the fly, and 'Y' at the wheels.. the difference is 17.77777% of X

 

Simply put ...

 

X= 1000bhp

Y= 900

 

thats a 10% loss .. ie 100bhp

 

X = 100

Y= 90

 

10% loss ie 10bhp

[Toby]

 

 

Toby.. how did i work out Gaz lost 17.77777% of his power to the tansmission.. very very simple .. He made 'X' at the fly, and 'Y' at the wheels.. the difference is 17.77777% of X

 

 

Sorry mate , you missed my point a little. The RR guessed it lost 17.777777% not you, although you did work it out!!

 

It just added 17.7777% to the wheel figure.

 

Pick a number, any number!! Add it on!! - (I appreciate / assume a lot of experience would have been used to deduce this figure. )

 

Another inconsistancy of the test between my Sanspeed test and TOTD is I was in 4th at S and 3rd at TOTD. Wouldn't make much difference, but a loss at the WHEELS which is where we're MEASURING for sure.

 

As Chris said - No rolling road can measure the power lost - whilst loaded!

[Guest MK1gaz]

So basically then a modern rally special 4wd car will have much more BHP losses at the wheels than a old fashioned Escort will have because an Escorts simple drive train has much less shite to turn and sap power with GO ON THE OLDSKOOL

[boXXer]

EXACTLY!

 

if they were using the same engine that is!

 

4wd has 4 driveshafts, 2 diffs, 2 props (sometimes), and 4 wheels to drive. So double the amount of loss usually.

[Toby]

EXACTLY!

 

if they were using the same engine that is!

 

4wd has 4 driveshafts, 2 diffs, 2 props (sometimes), and 4 wheels to drive. So double the amount of loss usually.

 

Some of them have EVEN got starter motors!!

[boXXer]

lol! sometimes