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chaging diff gears change dyno results? 

 

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 Post subject: chaging diff gears change dyno results?
Posted: Wed Mar 16, 2011 4:19 pm 
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As the title says does changing your diff gears affect your dyno read out? Like i have 3.45 lsd and it makes 161.3rwkw atm but im geting 3.7s with a lokka put in will this alter the read out at all? Just curious cos im also changing a few other things and getting it retuned, probly after the change of gears...
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 Post subject: Re: chaging diff gears change dyno results?
Posted: Wed Mar 16, 2011 4:57 pm 
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All things being equal, it shouldn't. But due to every one having Dyno dynamics gear and using shootout mode to give you a power run, then it most probably will.

 

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 Post subject: Re: chaging diff gears change dyno results?
Posted: Wed Mar 16, 2011 5:15 pm 
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See here - discussion with Mainline Dyno on AFF

Here:- http://www.fordforums.com.au/showthread.php?t=11286550

And here:- http://www.fordforums.com.au/showthread ... ost2955260

 

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 Post subject: Re: chaging diff gears change dyno results?
Posted: Wed Mar 16, 2011 9:20 pm 
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ok so shouldnt really make a difference.. but off the subject how do i correct speedo changing to the 3.7s?
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 Post subject: Re: chaging diff gears change dyno results?
Posted: Thu Mar 17, 2011 12:45 am 
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JakeysED wrote:
ok so shouldnt really make a difference.. but off the subject how do i correct speedo changing to the 3.7s?


I got a ratio box fitted by an instrument/gauge repairer. Cost me around $200?

 

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 Post subject: Re: chaging diff gears change dyno results?
Posted: Thu Mar 17, 2011 1:28 am 
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Wouldnt different ratios lead to different efficiency levels, and therefore, different results? If the tailshaft is spinning twice as fast at a given wheel speed, then there would be additional heat and loss somewhere in the driveline.. no ?

 

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 Post subject: Re: chaging diff gears change dyno results?
Posted: Thu Mar 17, 2011 11:05 am 
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I was told that changing the diff ratio does affect it, as does changing to a stallie.
When this happens all you are left with is the 1/4 mile strip and a Moroso calculator.

 

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 Post subject: Re: chaging diff gears change dyno results?
Posted: Thu Mar 17, 2011 11:46 am 
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Ahk so maybe it will drop the dyno reading... so if i got it tuned before the ratio change would i stuff the tune up wen i change them after the tune?
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 Post subject: Re: chaging diff gears change dyno results?
Posted: Thu Mar 17, 2011 8:28 pm 
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JakeysED wrote:
Ahk so maybe it will drop the dyno reading... so if i got it tuned before the ratio change would i stuff the tune up wen i change them after the tune?


Possibly a little as the engine would pick up revs quicker...so may need the ignition map tweeked.

 

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 Post subject: Re: chaging diff gears change dyno results?
Posted: Thu Mar 17, 2011 9:16 pm 
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Ok then ill do it all before the retune and either way it should have a quicker quarter time it sucks tho because i would like to see if the injecters, fuel reg, and bigger t/b make a noticable increase in kw and torque
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 Post subject: Re: chaging diff gears change dyno results?
Posted: Thu Mar 17, 2011 9:23 pm 
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Youd think changing diff gears will change dyno results because you have say 160 kw at the flywheel and only 105 or whatever at the treads because it goes through gear box and diff which reduces the power due to the gears?

 

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 Post subject: Re: chaging diff gears change dyno results?
Posted: Thu Mar 17, 2011 9:25 pm 
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Waggin wrote:
Wouldnt different ratios lead to different efficiency levels, and therefore, different results? If the tailshaft is spinning twice as fast at a given wheel speed, then there would be additional heat and loss somewhere in the driveline.. no ?



On a Dyno Dynamics ego inflation dyno you'll see a big change.
On a real dyno you'll see a very small change.

 

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 Post subject: Re: chaging diff gears change dyno results?
Posted: Thu Mar 17, 2011 9:50 pm 
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Im makin 161 at the wheels not the fly, and yeh my tuner uses a dyni dynamics one im pretty sure is ther many good tuners that use the 'proper dynos'?
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 Post subject: Re: chaging diff gears change dyno results?
Posted: Sat Mar 19, 2011 7:13 pm 
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At the end of the day, it doesn't what the dyno says. If the car is faster then thats all that counts.

 

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 Post subject: Re: chaging diff gears change dyno results?
Posted: Sun Mar 20, 2011 12:22 pm 
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yer spot on, thats the way i see it....
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