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View Full Version : Thor Dyno - what exactly do you get?



Conrad
21-09-06, 16:02
Ok, bare with me as I've never took my car on a dyno and not entirely sure what I'm on about!;) Hence why I'm asking here and not ringing Thor :D

Me and a few mates want to take our cars on a dyno but with me being auto I'm limited to where I can go. We was going to go to Thor but a mate of mine was unsure.

After seeing Thor's website he was wondering a few things. First of all do we have to take our wheels off? And secondly will you get both your figure at the fly and figure at the hub?

Jake
21-09-06, 16:06
First of all do we have to take our wheels off? And secondly will you get both your figure at the fly and figure at the hub? Yes the rear wheels have to come off as Thor's is a hub Dyno.
You'll just get a figure for the power at the hubs.
Thor's dyno is well known for giving very high readings, so you'll have a nice figure for pub bragging.

Conrad
21-09-06, 16:13
Yes the rear wheels have to come off as Thor's is a hub Dyno.
You'll just get a figure for the power at the hubs.
Thor's dyno is well known for giving very high readings, so you'll have a nice figure for pub bragging.

Do they calculate the figure at the fly too?

And am I right in thinking the figure at the fly is the figure most people quote as it's the higher one? I can never remember which is which/

merckx
21-09-06, 16:19
You need to know the percentage loss between the engine and hubs to do that.

They can just estimate this ,there is no exact figure.

The one at the fly is higher because you'll lose energy through the gearbox /diff etc.

Jake
21-09-06, 16:20
No, he won't give you a flywheel figure. If you ask he'll just tell you to add 20% on (which is way too much really but hey-ho)

The flywheel figure is the one most braggers use but it's bollocks really because nobody takes their engine out and actually measures the flywheel power they just guess it by adding a percentage to the measured rear wheel figure.
RWHP is the one that actually matters anyway.

Conrad
21-09-06, 16:31
Ok, last daft question now. Promise ;)

So when Toyota quote 330bhp for the Sup are they quoting flywheel figure or RWHP figure?

Bob
21-09-06, 16:31
flywheel

Ian W
21-09-06, 16:33
Ok, last daft question now. Promise ;)

So when Toyota quote 330bhp for the Sup are they quoting flywheel figure or RWHP figure?

flywheel hp ;)

666upra
21-09-06, 16:43
Surly if you have auto you cant have a fllywheel power rating as there is no flywheel?

Not to sure on that one

Stonkin
21-09-06, 16:45
Think an auto generally works on the basis of adding about 23% to the rwhp figure

RobSheffield
21-09-06, 16:45
Surly if you have auto you cant have a fllywheel power rating as there is no flywheel?

Not to sure on that one

It is just a name for it. If you prefer just think of it as Crank horse power, or power 'at the crank'

Jake
21-09-06, 17:08
So when Toyota quote 330bhp for the Sup are they quoting flywheel figure or RWHP figure?
330?
I thought they quoted 280 for the j-spec and 326 for the UK spec.

absz
21-09-06, 17:18
i had my car dynoed at surrey rolling road today. mines a auto and was told that you loose 25% through the transmission it made 397.4 hp at the wheels so that 530 at the fly on 1.2bar:)

Underworld
21-09-06, 17:21
Thats why manuals are better :p

chris aka fonz
21-09-06, 17:21
330?
I thought they quoted 280 for the j-spec and 326 for the UK spec.

i thought that 280 was quoted for j spec to keep with that deal that the jap manufacturers had with each other ?

Stonkin
21-09-06, 17:24
i thought that 280 was quoted for j spec to keep with that deal that the jap manufacturers had with each other ?

yes thats true, in my opinion and others that have had standard cars rolling roaded, the jap cars come out about 300 or nearer to the UK figure

Jake
21-09-06, 17:29
i thought that 280 was quoted for j spec to keep with that deal that the jap manufacturers had with each other ?That's right.

Gazboy
21-09-06, 17:35
yes thats true, in my opinion and others that have had standard cars rolling roaded, the jap cars come out about 300 or nearer to the UK figure

Mine had 250rwhp when standard at SRR, which is about right for a j-spec auto.

Wez
21-09-06, 18:59
i had my car dynoed at surrey rolling road today. mines a auto and was told that you loose 25% through the transmission it made 397.4 hp at the wheels so that 530 at the fly on 1.2bar:)

What turbo you running?

Sheefa
21-09-06, 19:22
Yeah J-sepcs rwhp was kept under wraps due to Japenese agreement. It is more like the +300 mark.

Absxxx, not sure igf that fly figure is right mate!. I had mine tested without the new Envy hybrid stage 3's back in May 2005 and got 381 rwhp and 421bhp at the fly. That was at 114mph with 381.2 lbft of torque. 1/4 mile time again without the new tubbies was 13.7 and 5.11 0-60 so guessing the 0-60 should drop to the 4.8ish mark now. I'm hoping to crack the 450rwhp soon with fueling and 550's.

Good result though mate :)

absz
21-09-06, 19:58
What turbo you running?


i'm running a t67 but still need to sort fuelling out it started running lean after 1.2bar so did't take it any further.

Wez
21-09-06, 20:39
Sounds good :)

Keith C
21-09-06, 23:08
i had my car dynoed at surrey rolling road today. mines a auto and was told that you loose 25% through the transmission it made 397.4 hp at the wheels so that 530 at the fly on 1.2bar:)

In my opinion, don't ever bother mentioning the flywheel figure - just state your at wheels figure - after all, that's the one that counts, because that's the one pushing your car along.

Pig
21-09-06, 23:24
i'm running a t67 but still need to sort fuelling out it started running lean after 1.2bar so did't take it any further.

I thought you were running the turbo fit T60-1 or 70??? or am i just confused somewhere down the line?

Homer
21-09-06, 23:29
In summary, an over inflated RWHP figure ;)

They're rather famous for it; Lui told me this week he had nearly 400 rwhp quoted on a stock turbo'd jspec from there - on an auto too...

supRo
21-09-06, 23:29
I thought you were running the turbo fit T60-1 or 70??? or am i just confused somewhere down the line?

Abs was running the XS Power T-60 but now on BL T67, P trim.

Pig
21-09-06, 23:30
In summary, an over inflated RWHP figure ;)

They're rather famous for it; Lui told me this week he had nearly 400 rwhp quoted on a stock turbo'd jspec from there.

Lol, good effort lui :) i know his is meant to be quick one, but le not be sill thor. Its a shame there isnt a way to have them all calibrated the same :(

Homer
21-09-06, 23:33
but le not be sill thor.

Eh? :search:

absz
21-09-06, 23:38
i did take mine to thors hoping for a good fiqure:) but my car was too wide for there machine:(

paul mac
21-09-06, 23:51
what exactly are you doing mate, is it a just a power run ? or are you having the car set up, what i can say is Thor are decent chaps who wont try to sell you a new ecu for 1500 cos your AFR is 0.00001 out on the richter scale :p they just do exactly what it says on the tin, that is set cars up

Pig
22-09-06, 09:29
Eh? :search:

Who knows I was meant to say?!?

Matt Harwood
22-09-06, 09:36
In my opinion, don't ever bother mentioning the flywheel figure - just state your at wheels figure - after all, that's the one that counts, because that's the one pushing your car along.

Totally agree. RWHP is the actual measured figure. Any attempt to guestimate a flywheel figure is fairly pointless as it can only ever be a total guess at the best times. Unless you want to remove the engine. ;)

dandan
22-09-06, 09:43
Yep agreed, best to stick to hub or wheel figures.

A good BPU on the Thor dyno wants to be making 360+ at the hubs. (something like 395-400bhp at the crank).

Burna
22-09-06, 10:11
As a guide for the Midlands RR day Sunday what should I be looking at RWHP for mine? Stock UK engine, both cats in, stock exhaust. Thanks.

Matt Harwood
22-09-06, 10:22
~260rwhp

Burna
22-09-06, 11:01
~260rwhp

Thanks Matt, fingers crossed I get near that Sunday :)

imi
11-01-07, 13:29
Yep agreed, best to stick to hub or wheel figures.

A good BPU on the Thor dyno wants to be making 360+ at the hubs. (something like 395-400bhp at the crank).

if its making 360 @ the hubs, how much would it loose (approx) @ the wheels.

dandan
11-01-07, 13:42
No idea - you'd be comparing two different rolling roads then so no-one can say unless they've been on the hub dyno and the different rolling road with identical engine and conditions.

You'll get a higher reading at the Thor hub dyno than an "at the wheels" figure from most other places though....

imi
11-01-07, 13:44
http://www.mkivsupra.net/vbb/showthread.php?t=14480&highlight=THOR+DYNO

This made some interesting reading.....

Bobbeh
11-01-07, 13:48
I gained 41RWHP on the hub dyno from my dyno dynamics RR result... apprently ;)

dandan
11-01-07, 13:58
Exactly.