RWD_cossie_wil

iTrader: (9)

So, what advantage does the billet wheel give?

Turbosystems

iTrader: (5)

Billet wheels are designed to withstand high pressures
they are substantially lighter and have an increased flow
Steves gained 30bhp at the hubs on the SAME dyno
the garret GTX range use billet comp wheels

RWD_cossie_wil

iTrader: (9)

Being lighter has it increased spool time? I'm running a Ball bearing 247 shafted T4 with a GT35 front housing, so could be interested in this! What's the max power it could produce with the rest of the engine optimised for it? Circa 500 at the moment.

SiZT

With the billet comp wheel you'd have pretty much the ultimate T4

Turbosystems

iTrader: (5)

best thing to do is hub dyno it with the turbo you have then hub dyno it on the same dyno with the billet wheel conversion
We can then record the surging gt35 compressor for pf evidence roflol
The anti surge T4 and t 38 have a lovely supercharge whine at part loads
4i was playing choo choo trains with his throttle

fraser9764

iTrader: (3)

Was that with the addition of an anti surge housing as well?

Turbosystems

iTrader: (5)

anti surge and billet were done at the same time but his act was 10rising to 16 degrees higher than last time as it was a much warmer day
constant 23 C last time 32 C rising to 39C at 7400 this time ambient was 9 degrees higher than last time
so we'd like a run on a cold morning at 23 C ACT with it's new set up

DAN-Saff

I'm sure that mine doesn't surge, can you here if it does from the video below?

http://www.youtube.com/watch?v=WR02f...e_gdata_player

cossie4i+

iTrader: (15)

Have you fixed Johns shed yet ?

Steve

Turbosimpsons

iTrader: (3)

Less of the shed. At least its a real one .

cossie4i+

iTrader: (15)

A very rusty real one

Steve

Turbosimpsons

iTrader: (3)

SO. and your point is

glockenspiel lover

Or just dyno it on the same rr!!!lol..

If you use a dd rr it will give you a better power fig too!!

Turbosystems

iTrader: (5)

RR's are hard work
engine dyno is best
next best is a hub dyno

glockenspiel lover

youve obviously never used a decent rolling road??

Engine dyno is awesome but the engine still has to be checked and re set up after wards once in car so irrelevant in this argument..

Hub dynos always over read and theyre grief to set up taking wheels off etc etc..

A dyno dynamics rolling road is the best out there imo unless your running massive power(800 hp+)then yes id agree to a hub dyno but only if you take the hub power as flywheel power..

Turbosystems

iTrader: (5)

all aldi priced RR are hard work with any turbo charged car over 300 bhp
1 minutes mapping 1 hour cooling down period lol
here's a mild RR incident http://www.youtube.com/watch?v=MWs_iW4H_S8
I'm sure some more serious ones will be posted

glockenspiel lover

A bad rolling road video isnt going to make everyone decide theyre shit tony!!

You need to spend some time on a dd rr to see how good they are..untill then you shouldnt put them down..
As for cooling, then a hub dyno is just as hard an inviroment as any rr so no argument there!!lol

JonnyBravo

Hows the Escort Danny

Turbosystems

iTrader: (5)

where did I state Dyno Dynamics Rolling roads
I merely stated Rolling Roads

Jay,

iTrader: (4)

Mate its not Dan its his alter ego

Mark Shead

The RR I use went through 5 diff fans till I was happy to run big power cars there.

Mark

glockenspiel lover

You said all rr are hard work full stop!!

Iv seen and been on a few and i agree most are pretty shit buy a dyno dynamics happens to be the bollox especially with a good fan upfront..

JonnyBravo

Right o

Turbosystems

iTrader: (5)

I know what I said
and yes they are all hard work
engine dyno then hub dyno

arse end happy

mark have you moved yet coz kiron my neighbour spoke to you about getting my car mapped by you.coz your the man he says

glockenspiel lover

Or if your just checking power with a simple power run for before and after mod figures a dyno dynamics rr will be fine!!

Mark Shead

Yes just moved unit, hopefully will be all ready for new work next week.

Mark

arse end happy

ok mate ill grab the number off kiron an give you a call next week or so cheers mate spence

Turbosystems

iTrader: (5)

that is a massive operation
you won't be able to find a fookin thing
just blame the wife lol

Turbosystems

iTrader: (5)

and a hub dyno would be even finer roflol

Mark Shead

Dont I knowseem to move ever 3 years and I still cant find stuff from the last move,
Cant blame the wife lol.

Mark

Turbosystems

iTrader: (5)

neither can I any more
I can't find fook all I haven't moved in over 20 years

scoooby slayer

iTrader: (4)

that is simply not correct, rototest have done extensive tests to proove it aswell hub figures are between 6 - 10% losses to flywheel, dyno dynamics use what 17% roughly ?

but saying hub figures are flywheel figures is wrong, adding 18% is ludicrous i agree but a small percentage must be added.

heres one i picked at random

http://www.rri.se/popup/performanceg...p?ChartsID=688

shows 8% power loss from flywheel to hub.

glockenspiel lover

The guys at afr tuning and austec have a dd rr and an engine dyno and last year with theyre drag supra the hp figs between the engine dyno and dd rr upto around 900 ish hp were nearly bob on but when the gas was used the rr simply couldnt deal with it so they took it to a hub dyno as have many of their customers..

The hub figures always seem to be very close to the flywhell figs the rr calculates..

I agree with you there must be some loses but seeing power back to back sugests the figs from the hub arnt correct to start with hence the wrong calcs..

These guys just take the hub fig as the flywheel figs as the engine dyno and the rr have both proven this..

scoooby slayer

iTrader: (4)

admitadly its a rototest hub dyno the test results are from so i guess they may not be relevant to a dynapack.

glockenspiel lover

Have you had your supra on the dyno dynamics yet to see how it compares??

ozmk1cos

Turbosystems, is one of your reasons to prefer the hub dyno to rr is that it takes out variables eg strapping down

scoooby slayer

iTrader: (4)

not yet i cant, new carbonetics triple clutch has only done 100 miles so far, they cost £2900 so i dont really wanna fook it up again lol

once ive done another 700 1/4 throttle miles then it can have hell again

im hopeing to have some comparison runs for my skyline next week if it goes to plan, but that will be dynapack v dyno dynamics.

supra was run on tdis rototest.

scoooby slayer

iTrader: (4)

that is the exact reason i like them, less variables can only be a good thing when tuneing.

SiZT

A good way I've found is to use virtual dyno and then pull logs off the ecu of a full throttle run (in 3rd/4th w/e). It's fairly good for showing differences (provided theres no hills involved )