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dyno sheet
 dattoman_1000  2005/6/11 11:34  Tell a friend
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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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| racinaround |
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.
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| dattoman_1000 |
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: 2692 |
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
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| ddgonzal |
Posted: 2005/6/14 6:53 Updated: 2005/6/14 6:53 |
Moderator   Joined: 2001/5/3 From: 48 North Posts: 31623 |
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.
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