Dyno Testing The 6 Speed Auto

[EZ2CME]

So would running the ZF in 3rd gear give a higher power reading that it actually has or lower power reading than it actually has?

[JimmyXR6T04]

Thanks for all your replies guys. Ran up my new tune from Simon (XFT) at Gentech today using 4th gear and managed a bees dick over 400rwkw. I'm very happy with the tune, and it still drives like a stockie until you stick your foot into it.......and then holy snapping duck sh#t it takes off and pulls really strong all the way through to the top end.

geez mate, that's an awesome result!! what else have you done since the last tune?? And on gentechs dyno, that's even better! A lot of the people from the dyno day had their cars running about 10-15kw down compared to other dynos and their old dyno from what I was told.

We're gonna have to catch up again some time, so you can show me how the beast goes

You'll have to go to the next dyno day, and show up some of the LS1 owners... I think the best on the day was about 424rwkw, so you wouldn't be too far off!!

[Phoontastic]

Mate, just a new tune from Simon. The Monday after the dyno day it ran 374rwkw but was boosting a bit high, so I sent the box back to Simon. The man's a genius I tell ya. He cranked the boost back to suit our cold weather, worked some more magic, and it's running like a dream. I'll be going to the next dyno day for sure. I think it's in September.

[groper]

So would running the ZF in 3rd gear give a higher power reading that it actually has or lower power reading than it actually has?

running a car in a lower gear makes the dyno show a higher figure... if you want a car to show higher power than it really has use 3rd gear.

most powerful cars cant run on the dyno in any less than 5th gear though due to traction issues -which makes them show a lower reading than they really have and their power in reality, even more impressive. for example my car showed 369rwkw in 5th, but 396rwkw in 4th, so there is about a 10% loss in measured power. in 3rd youd get somthing like a 10%+ gain in measured power...

[Phoontastic]

Interesting, so how do you get a level playing field in events such as dyno days where all sorts of gear combinations and tyre sizes are being run?

[koppers]

We do ours in 4th because it is direct drive. 1 is to 1.

Nizpro do the same.

Cheers Paul

How come all of the ute's runs have been in 3rd?

[groper]

Interesting, so how do you get a level playing field in events such as dyno days where all sorts of gear combinations and tyre sizes are being run?

good question... not having the knowledge I do now until very recently when I had my car tuned, have not had the chance to ask. but I would say that its not a level playing field... when you have many different types of cars, diff ratios, tyres and other variables, its impossible to have it all equal. but if the gearbox and diff ratios are known, you could in theory calculate an adjustment coefficient to be applied to a vehicle`s dyno run.

so if you had an exact 1:1 final drive ratio, you would have a coeffient of 1. ie no change

if the final drive was 1.21:1 then you would have a coefficient of 1.21 and multiply the dyno figure by this to achieve your true output.

I have no idea if this is done in dyno comps, but in theory it should work.

this is all meerly pure speculation on my behalf and I accept no responsibility for accuracy, missuse or abuse of the above information whatsoever

[04RSD]

when my car was stock it made 222rwkw in 4th and something huge like 250+ in 3rd so we just figured that 4th was the gear to run in and have been ever since

[Paul@eliteauto]

How come all of the ute's runs have been in 3rd?

Yep made a mistake we actually do them in third because the dyno can go into over speed in 4th.

Sorry for the bum steer.

Cheers Paul

[koppers]

ha ha just keeping you honest Paul