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Main : Members : dattoman_1000 dyno sheet

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dyno sheet
dyno sheetPopular
Submitterdattoman_1000More Photos from dattoman_1000   Last Update2005/6/11 11:34    Tell a friendTell a friend
Hits3532  Comments2    0.00 (0 votes)0.00 (0 votes)
Todays dyno run
Says done in 4th gear I think it mighty have actually been done in overdrive 5th. Not sure if this effects the figures though

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Poster Thread
Posted: 2006/12/9 6:07  Updated: 2006/12/9 6:07
Just can't stay away
Joined: 2005/12/9
From: Florida, USA
Posts: 141
 Re: dyno sheet
Using a Dyno-Jet chassis dyno and trying different gears on production (helical gear) style transmissions I have seen a little more than a 1% difference between the direct drive gear and the underdriven or overdriven gear on either side of direct. 2nd gear shows more power than 3rd, 4th (usually direct) shows more than 5th. It's seems to be as much about torque multiplication as it is about efficiency loss through gear ratios.

Poster Thread
Posted: 2005/6/11 11:55  Updated: 2005/6/11 11:55
No life (a.k.a. DattoMaster)
Joined: 2002/8/11
From: Perth
Posts: 2662
 Re: dyno sheet
Todays dyno run
Since we dropped comp back to 10:1 this will have to do
Glad the car only weighs 620kg

Poster Thread
Posted: 2005/6/14 6:53  Updated: 2005/6/14 6:53
Joined: 2001/5/3
From: Hawaii, USA
Posts: 30820
 Re: dyno sheet
99 rear-wheel horsepower is very impressive for an A12.

The way I understand it, in 4th (direct drive) there is no power loss due to the gear meshing. In 3rd or 5th, there will be that loss. Some racing transmissions use noisy straight-cut gears to reduce the power loss.

Does the graph indicate Air/fuel ratio between 10:1 and 12:1 -- that's very rich isn't it? I thought 12:1 is used for full-power maximum load and more than 14.7:1 for maximum economy.