DYNO DAY !!

[escortman]

when i get my kent to do my ecu im going to put it on my mates dyno to compare diff (both rolling roads)

[tsoob]

didnt a s14 get 220 or something?

yes it did, my bad, it was a HOS tho....

r/r vs hub,, well simple go on a rolling road do absolutley nothing bar change your tyre pressures by 5 psi and look at the difference..

Hub is more accurate as it eliminates this problem.

[strx7]

generally a HUB type dyno will read more HP than a rolling type dyno, also depends on the type of dyno. different brands of dynos will read different HP for the same car, end of story. Hence the only TRUE power figures are at the engine on a engine dyno

[2jayzgte]

generally a HUB type dyno will read more HP than a rolling type dyno, also depends on the type of dyno. different brands of dynos will read different HP for the same car, end of story. Hence the only TRUE power figures are at the engine on a engine dyno

I agree with that completely about a TRUE dyno reading is at the flywheel I think alot has been made about RWHP figures to be fair and I reckon alot of this histeria comes out of the U.S.I've seen Dyno-jet figures out of the U.S for Supra's that are over inflated and apparently there Dynojets give about a 15% higher figure than a Dyno Dynamics type Rolling Road.Its funny how the Japanese don't measure RWHP they just give a HP figure you don't really hear them talk about RWHP that much.

[Lith]

The other funny thing about the Japanese is they tend to estimate their HP from readings on a chassis dyno.... I remember a lot of laughing from Australians when the Hioctane track R32 GTR from Oz which went over for Tsukuba revspeed time attack, and supposedly ran on a Japanese dyno. If what they say is true, they credited it with something in the area of 800hp, running only a pair of GT2860RSs hahaha.

Dynos are only useful for comparing against other runs done on the same dyno really.

In terms of cars wheelspinning on dynos etc, the really powerful things are usually running with VHT sprayed on tires, real flash compound things and huge tie downs. Any time I've ever done it - its just been the basic setup. People don't usually worry too much about the torque cars which idle smoothly at a whispery 72db or so. Its been seen more than once lighting up the tires on them with "only" mid 200rwkw.

[strx7]

A guy in aussie got a 650HP (engine dyno) 383cu-in Commodore and stuck it on various different dyno's in both auto and manual to prove the differences in RWHP. which is what he got
Dyno Daynamics - most aussie dynos
Manual 27% less than crank
Auto 29% less than crank

Dyno Jet - most US dynos
manual 15% less than crank
auto 17% less than crank

Dyno Pak - NZ Made Hub type
manual 9% less than crank
Auto 11% less than crank

[IH8TEC]

A guy in aussie got a 650HP (engine dyno) 383cu-in Commodore and stuck it on various different dyno's in both auto and manual to prove the differences in RWHP. which is what he got
Dyno Daynamics - most aussie dynos
Manual 27% less than crank
Auto 29% less than crank

Dyno Jet - most US dynos
manual 15% less than crank
auto 17% less thank crank

Dyno Pak - NZ Made Hub type
manual 9% less than crank
Auto 11% less than crank

sounds about right, i got 196kw on 25psi on dyno dynamics, whereas the guys in wellington on a dyna pak get 220ish on 18psi,

but yeah like been said, track is more an indication of power i feel

[Crucible]

sounds about right, i got 196kw on 25psi on dyno dynamics, whereas the guys in wellington on a dyna pak get 220ish on 18psi

haha excuses excuses

[IH8TEC]

sounds about right, i got 196kw on 25psi on dyno dynamics, whereas the guys in wellington on a dyna pak get 220ish on 18psi

haha excuses excuses

12.6

[Lith]

sounds about right, i got 196kw on 25psi on dyno dynamics, whereas the guys in wellington on a dyna pak get 220ish on 18psi,

but yeah like been said, track is more an indication of power i feel

Yeah track is the best indication, though car setup and driver DO come into it solidly. I recall there being a thread of someone on here with a 6speed manual twin turbo Supra trapping at only 153kph, which is 20v territory.

I'm There is varience between all of the different dynos - even between different hub dynos and different rolling road dynos so its not so clear cut as that. At 280wkw I measured a 7% MAX difference in power between a Dyno Torque rolling road dyno and one of the more generous hub dynos. At that rate, you'd be looking at 209kw on hub dyno.

I'm not saying thats definitely what you would make, basically saying there is a lot of things which come into it.

[IH8TEC]

oh and for the people that say hub is better than rolling road.

it's a load of arse.

a dyno is only a tuning tool, and only as good as the operator using it.

just thought i'd put that out there

[2jayzgte]

True again the track is the place to find out what a car really has wheather it be the strip or circuit i've been on the track with alot of so called high HP cars over the years and lets just say after a run or two with them I'm thinking umm maybe not 500-600 or what ever it maybe.

[mjrstar]

[quote="IH8TEC"]oh and for the people that say hub is better than rolling road.

it's a load of ar*e.

quote]

ok mr 'i'll run my car on the dyno on semi-slicks'

at least a hub dyno will save tyre wear even if it is a hassle to set up...
personally i have run my car on road tyres at the dyno because i'm a cheap a*se.

[IH8TEC]

yeah i forgot to tell him they were semi's, if he knew before he started, he would have taken longer between runs thats all,

mental note for next time

[tsoob]

:lol: yeah i forgot to tell him they were semi's, if he knew before he started, he would have taken longer between runs thats all,

mental note for next time

HEHE i know where you can some new ones.

[Lith]

oh and for the people that say hub is better than rolling road.

it's a load of ar*e.

a dyno is only a tuning tool, and only as good as the operator using it.

just thought i'd put that out there

Disagree very fully, but the world would be a boring place if all agreed. I personally like to minimise the amount of variance when trying to tune etc. When tire pressure/traction, wear, and the whole "not having the car secure" thing as things to consider I'd much rather something that there is just no guessing. The car is attached, it can't escape, there won't be any change if the tires warm up or wheels are changed from one run to another - its all good.

[mjrstar]

well i consider the 4 big strops kent puts on my car when it's on the rollers to make it pretty dammed secure...
unsure of how much load hub dyno's place on the wheel studs as they wouldn't be a nice fit on the locating ring like a wheel is.. but like you there are +'s and and -'s for bith. just use whatever you prefer.

[Bazda]

bah , who needs dynos, online engine hp calculators ftw!!

[Lith]

bah , who needs dynos, online engine hp calculators ftw!!

Illegal drags ftw.

[Bazda]

bah , who needs dynos, online engine hp calculators ftw!!

Illegal drags ftw.

no idea what illegal drags has to do with this???