dyno results
Submitted: Sunday, Sep 26, 2010 at 18:58
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zacc
Hi all, how do they convert dyno results from rear wheell results to what the manufacture results (fly wheel) Thanks
Reply By: fisho64 - Sunday, Sep 26, 2010 at 19:10
Sunday, Sep 26, 2010 at 19:10
They don't. The manufacturers test it at the flywheel, on a dedicated test bed. While transmission losses can be estimated, they vary widely.
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431496
Reply By: zacc - Sunday, Sep 26, 2010 at 19:36
Sunday, Sep 26, 2010 at 19:36
Oops i should have read my post before i posted it .
What i meant , is how do you convert dyno results from the rear
wheels to fly wheel results ?
Sorry
AnswerID:
431503
Follow Up By: Robin Miller - Sunday, Sep 26, 2010 at 19:45
Sunday, Sep 26, 2010 at 19:45
As fisho says you can't directly , but looking at figures from similar cars can help you get an idea.
e.g. my patrol puts out an estimated 213Kw at the flywheel.
When it was run it I had it dyno'ed and it put 125kw at back
wheels for its claimed 185kw at flywheel (185/125= 1.48 )
So after playing around it then measured 143kw at rear
wheels X 1.48 factor becomes 213kw.
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Reply By: Member - RockyOne - Tuesday, Sep 28, 2010 at 09:59
Tuesday, Sep 28, 2010 at 09:59
Remembering of course, we are ;out in the sticks' a new latest 'State of the art' (love that term) Dyno has been installed to service the public in
Emerald Queensland. Talking to one of my mature (middle age, but still loves his revs) mates yesterday, he got a performance enhancing extractor system fitted to his Ford XR5 and a tune up on the dyno. Went from 260 to 410 for about a bit over a hundred bucks after extractors. Wonder if they can put us mere mortals on the rollers. Rekon I could do with a chip. (not a pace maker;-)
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Follow Up By: Alloy c/t - Tuesday, Sep 28, 2010 at 15:30
Tuesday, Sep 28, 2010 at 15:30
260 to 410 for a bitover $100 ? In the words from the castle 'tell him he's dreaming'...
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Follow Up By: Member - RockyOne - Thursday, Sep 30, 2010 at 12:21
Thursday, Sep 30, 2010 at 12:21
Don't think you read it correctly. The upside included the magic extractor system which still makes it good value, certainly if towing. But then, some might say that life is just a dream, when the dream ends you become a statistic. Only then does any permanence come into effect ;-)
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Follow Up By: chasekell - Sunday, Oct 03, 2010 at 20:34
Sunday, Oct 03, 2010 at 20:34
Dyno's need to be set up corectly.. cant see how such a big gain could be achieved by an extractor system. In fact it cant be.. maybe 20-25 kw extra but that's at the extreme end of hopefullness..
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Follow Up By: Member - RockyOne - Monday, Oct 04, 2010 at 10:02
Monday, Oct 04, 2010 at 10:02
Seems this latest 'Dyno' computing setup does far more than give a few readings from the traction area. As everything is chipped these days, but mostly for Mr & Mrs Jones (why we always pick on the Jonses..Keeping up with the Jonses etc?) Thursday night shopping expedition or the big adventure, the one hour drive to
the beach. Performance here may be measured as 'Go: Pause: Stop' where anyone pushing the boundaries embrace the much enhanced performance after the Dyno extensive ' Medical'. Many of the guys getting into this area of vehicle improvement can actually drive. They get their skills from time behind the wheel, swapping notes with like minded adventurers, but not from shooting up drugs or polishing a bar stool before venturing out onto the public road system to endanger all of us. They have real financial and emotional attachment to their prized machinery, so are not about to see it wrecked. ('You are sounding like an ex hoon RockyOne;-)
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Follow Up By: tonysmc - Monday, Oct 04, 2010 at 12:28
Monday, Oct 04, 2010 at 12:28
I remember years ago a friend had booked his in to have a turbo put on it. Before they did the job they always put it on the dyno and then again after so the difference could be seen. When they did the first dyno test they noticed how "out of tune it was" as it was way under powered for what it should have been. They tuned it, rang my mate and asked him to come and drive it and see if he still wants the turbo as it had so much more power. (Yes there are honest mechanics) He said it was like a different car but he had put away the money for the turbo so fit it anyway. So I can believe the great result from above because the car may not have been running at its optimum performance level in the first place. Just a thought.
Cheers Tony
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702889
Reply By: howesy - Monday, Oct 04, 2010 at 10:56
Monday, Oct 04, 2010 at 10:56
why would you care in a 4WD ?
Its low down torque between idle and 1800 revs I'd be wanting to improve and I'd sacrifice a few kilowats to do it. Lets face it whats the point of gaining 20kw when that 20Kw is not seen until 4500 or 5000 revs. Who drives around at that anyway at usual driving revs you might only have a 1Kw increase.
Anyway off the subject, most dyno
places will be able to estimate driveline loss based on experience and the will be able to approximate your flywheel power.
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Reply By: chasekell - Monday, Oct 04, 2010 at 12:51
Monday, Oct 04, 2010 at 12:51
Most car manufactuers set a tune up from stock for pollution issue to meet Australian standards.. Most cars these days can be retuned to add more punch not only to top end kw but also tweeking a bit here and there with fuel, air and timing mixtures to gain more torque..Even with an added better breathing header stystem(s) there would be no way to gain anymore than 50-60rwk even with a retune...TORQUE is the factor which most people regardless if it's a norm car or a 4wheel drive really need..better fuel economy for a start...Changing diff. ratio can help with the torque situation as
well..
My two cents worth anyhow.. :)
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