Rolling Road Results

[Axeboy]

http://img159.imageshack.us/img159/4313/rr13fr.th.jpg (http://img159.imageshack.us/my.php?image=rr13fr.jpg)

http://img84.imageshack.us/img84/2360/rr22ea.th.jpg (http://img84.imageshack.us/my.php?image=rr22ea.jpg)


214whp..

What you think that equals? I was hoping for 300 at the fly?

The guy also thought the intercooler was similar to an MR2 turbos and that it should be upgraded next.

[paulmc]

Fly power would be around 316, I lost 102 from fly to wheels. Very good result :thumbsup: You have 2psi more than me at the top end I made 204 atw

what torque did you make cant read that graph?

Good to have a bit of competition now :2thumbsup

[conaboy]

Sounds good then.

The torque was at wheels... 1509LBF (Wheel Torque) @ approx 2500rpm

[zentac]

Sorry theres no way your loosing 1/3 of you bhp through your transmission. You should ignore "guesses" as to what flywheel power your running as they are all inaccurate and compare wheel bhp`s, which can still be inaccurate due to tyre slippage. You really need an engine dyno to comprare flywheel power or a chassis dyno to compare bhp at the hubs.

[conaboy]

Logged in as workmate doh

[enigma]

Sorry theres no way your loosing 1/3 of you bhp through your transmission. You should ignore "guesses" as to what flywheel power your running as they are all inaccurate and compare wheel bhp`s, which can still be inaccurate due to tyre slippage. You really need an engine dyno to comprare flywheel power or a chassis dyno to compare bhp at the hubs.

Dont you believe it! Transmission losses are huge!

[valmes]

Shouldn't be that huge... 3S guys are loosing at most around 80hp. Try searching 3si.org archives on this topic.

[enigma]

That is still getting on for 1/3 though! I think Richard underestimates the power sapping 4wd/Auto combination!

[paulmc]

On my evo i lost 80bhp so I think 102 is not far out for the auto.

I dont think you can just ignore Fly figures as they give a rough guide and if you listen to how the guy at Wallace went over how his dyno worked it out I reckon it is pretty close

[Wodjno]

Does that make my figures of BHP at the wheel via my GTech about right then .. Cos i thought it was low but didn't quite know how much difference the Transmission ans 4WD would make .. It came out at 199.9 WHP .. :inquisiti

[enigma]

With the Gtech you also have rolling resistance which will make your figures lower by 30-40BHP. I recorded 214 with my Gtech at 0.7 Bar :thumbsup:

[ako]

Oh.. I was under the impression youd actually pulled your engine out and thrown it on an engine dyno. Guessing from an ATW figure is a guess, might be an educated one but nothing more.

Also - testing an auto and a manual FTO, identical otherwise, gave power figures within 1kW.

Same goes for g-tach figures, unless you put your car on an accurate weighbridge, its guesswork.

Another thing, even tyre size can affect ATW power figures. Its useful for tuning - "Yes, this made power go up", otherwise the only true test is an engine dyno or racetrack.

[zentac]

I dont think you can just ignore Fly figures as they give a rough guide and if you listen to how the guy at Wallace went over how his dyno worked it out I reckon it is pretty close

Rubish, a slightly sticking break or slightly under inflated tyre can give you a lot higher rolling resistance hence lower flywheel bhp. I think you have to ignore flywheel bhp as its only an estimate and not accuratly measured.

[bradc]

I'm going to get my stock facelift auto dynoed in 2 days, I'll post up something so we can compare. I realise different dyno's will give different results, but it should be an indication.

[paulmc]

Rubish, a slightly sticking break or slightly under inflated tyre can give you a lot higher rolling resistance hence lower flywheel bhp. I think you have to ignore flywheel bhp as its only an estimate and not accuratly measured.


How can you say rubbish then agree with me. I said they gave a rough idea, you said rubbish then said they gave an estimate.


A sticking brake does make a difference, this was seen at another rolling road day as the guys atf figure was way high for the atw figure but that rollers did not do a run down test to work out the resistance for fly figure.

I was quite impressed with the dyno compared to older ones I have used and as technology moves on we cant just say rubbish to new things /pan :thumbsup:

[Kieran]

....as technology moves on we cant just say rubbish to new things /pan :thumbsup:

Argeed! :chugchug: /yes

[Axeboy]

I'm going to get my stock facelift auto dynoed in 2 days, I'll post up something so we can compare. I realise different dyno's will give different results, but it should be an indication.

Yep, sounds good.

Could a new area be set up for rolling road results?

[ako]

Make it an international area / competition though!

[paulmc]

yeah I like that idea :thumbsup:

[conaboy]

Sounds good then.

The torque was at wheels... 1509LBF (Wheel Torque) @ approx 2500rpm


Can anyone help me here?

No own axeboys old car and not sure what 1509 LBF actually means.

Can anyone convert to Lb/ft or am I missing something??

[Axeboy]

Doesnt mean anything.

Only useful for comparison on the same rolling road....

So i was told.

[conaboy]

A bit strange?

Thought all Rolling Roads measured torque and converted to bhp?

[amsoil]

Had a look at the 1st diagram and it looks very acurate as at 5250rpm the BHP and torque must be the same; made me smile that it never crossed my mind that with 4 WD you have to add the the 2 roller readings together to prove the graphs correct.

1509 lb f what is this a 12 litre turbo diesel lorry or something?

[Axeboy]

Shows a bit of difference between front and back too...

More like 55/45 split