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700cc Injectors

danoz

By danoz,
in Engines & Forced Induction

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r33_racer Grand Master

r33_racer

Posted
Posted (edited)

I dont believe bhp = rwhp

brake horsepower is power measured at the flywheel as on an engine dyno

and rear wheel horsepower is that figure less any drivetrain losses.

So dirt garage made about 540hp at the wheels(4) on that setup.

Edited by r33_racer
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Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted
I dont believe bhp = rwhp

brake horsepower is power measured at the flywheel as on an engine dyno

and rear wheel horsepower is that figure less any drivetrain losses.

So dirt garage made about 540hp at the wheels(4) on that setup.

thats just outright horsepower as in hp...i was always of the understanding that bhp was at the wheels i.e. the brakes.

we also made between 443 and 467 on the same setup using race fuel.....depending on the day/dyno/boost levels.

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Denver Grand Master

Denver

Posted
Posted (edited)
A general rule of thumb for (manual) drivetrain loss for newish cars is:

AWD 18%

RWD 14%

FWD 12%

So for RWD -

Given that 700cc~700hp

700hp - 14% = 602rwhp (~449rwkw)

No...

drive train loss is NOT A PERCENTAGE

its a pretty much fixed figure, give or take a hp due to oils/wear..

real loss figures are like this

AWD, it varies system to system, i believe the atessa setup sucks about 70hp out of it

RWD, 25-30hp

FWD 30-40hp

add to it you will lose more power if your driving an auto, but its about 10-20hp extra..

% loss figures are utter crap, and not to be believed, if your going to quote a %, use a sliding scale for loss compared to power, do not just have a flat % value as your loss, as its totally and utterly wrong..

Edited by Denver
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pkblade Experienced

pkblade

Posted
Posted
No...

drive train loss is NOT A PERCENTAGE

its a pretty much fixed figure, give or take a hp due to oils/wear..

real loss figures are like this

AWD, it varies system to system, i believe the atessa setup sucks about 70hp out of it

RWD, 25-30hp

FWD 30-40hp

add to it you will lose more power if your driving an auto, but its about 10-20hp extra..

% loss figures are utter crap, and not to be believed, if your going to quote a %, use a sliding scale for loss compared to power, do not just have a flat % value as your loss, as its totally and utterly wrong..

I realise the percentage calculations method is flawed but, its a quick way to get a good guesstimate.

BTW RWD has slightly more of a drivetrain loss than FWD.

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R31Nismoid Grand Master

R31Nismoid

Posted
Posted
No...

drive train loss is NOT A PERCENTAGE

its a pretty much fixed figure, give or take a hp due to oils/wear..

real loss figures are like this

AWD, it varies system to system, i believe the atessa setup sucks about 70hp out of it

Well thats not correct either

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Swiper the Fox Grand Master

Swiper the Fox

Posted
Posted
no, brake horsepower is the measure of the power without any ancilarries (no alternator, no gearbox, no air con etc etc). it doesn't have anything to do with the brakes :rofl:

cool...i can go home now....ive learnt something.

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Beer Baron Grand Master

Beer Baron

Posted
Posted

yeah i'm a fountain of knowledge... well i'm a fountain of something. lol

i think SAE measured HP is done with all ancillaries for the car it is to be installed into and power is measured as what is being delilvered to the flywheel. it's more common now than BHP.

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