Chassis dyno questions |
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Chassis dyno questions |
Cevan |
Jun 15 2010, 01:33 PM
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#1
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Senior Member Group: Members Posts: 1,079 Joined: 11-December 06 From: Western Massachusetts Member No.: 7,351 |
I want to mazimize the tuning of my carb'd 2056. Short of seat-of-the pants tuning, I figure using a chassis dyno is the way to go. I haven't checked to see where the nearest one is or how much it will be, but after spending all this time and money building it, I'd hate to leave any power on the table. I'm just not sure how you go about using it to tune the engine.
I assume I should have the engine pretty well broken in and running well with the carbs jetted as good as my seat-of-the-pants dyno can tell. Do I go there with a variety of idle and main jets, air correctors, venturis, etc and start swapping things out one at a time based on a baseline run? |
McMark |
Jun 15 2010, 01:58 PM
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#2
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
You can spend between $500-1000 tuning on a chassis dyno and it's quite effective. You need to either find a shop that is familiar with your carbs, or get proficient at working on them yourself. You'll likely need your own selection of jets to swap in and out. You're paying by the hour on the dyno, so once you're hooked up and locked down, you're paying for time. The faster you can make the jet changes and do the next power pull, the better.
Another tip is to find a dyno shop that has a machine that allows for variable loads. Lots of 'cheap' dynos are only set up for WOT power pulls. If you want to tune for full WOT, that's fine. But you may find that WOT tuning doesn't give you great around-town drivability tuning. If you're looking for WOT tuning and will be doing some sort of racing, the dyno is worth it. If you're looking for great drivability and simply getting that as correct as possible, then you should invest in a variety of gauges (AFR, CHT, EGT) and simply spend a few weekends driving around and watching the numbers. You'll need to learn to interpret those numbers, but 'normal' driving can be difficult to simulate on a dyno, and therefore hard to tune. |
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