Quote:
Originally Posted by Vince@MSperfab
Amazing, Tim you can tune by looking at pictures?  |
pics and especially video of a car in the corners are incredibly valuable to tuning a car. I have had friends take tons of pics of my car in the corners so I can pour over them and consider them with my notes about what the car was doing at the steering wheel. Can you see when you are dragging or carrying a tire when in the car driving it? I sure as hell can't. Pics will show you tho'. Just picking these four images in a row from an above post tell me a ton about what that car was doing that day without ever actually driving it. Do you not glean a ton of info from just these four??? Especially the last one here?
Can I fine tune the car? Heck no; that takes driving it or driver input. But when it is gross adjustments, that can be seen.
Back on the thread, glad to hear you are making progress on the tuning. Having the rear of the car heavier than the front is a good thing, well to a point of course. I would love to set my coupe up to at least 55% rear distribution, 57% to 58% considered the "golden" ratio for road racing but I highly doubt that will happen and keep the weight between the wheels. 911s are more like 62% and a fair amount of that behind the wheels (sort of like the wagon would be) and that is why they can oversteer for days so I wouldn't want that of course
Getting the weight between the wheels with these old Novas is the tough part; they have so much rear overhang it makes for a chunk of weight always behind the rear tires. I set my 914 race car up at exactly 57.5% rear weight which split the difference and that car was easy to keep weight between the wheels.
That is a bummer about the driveshaft! Did it shear in half? Sucks that you guys would have went all the way to NV and have an issue like that put you back in the pits. It is one thing to break at a local track and lose a track day, another to be that far from home at a big event and have a failure.
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
I couldn't help but note that you mentioned wanting to stiffen the rear bar and reduce the front bar - I would have to say my gut feel from considering the attitude of the car in the corners and how much turn in is being applied to the fronts, I would stiffen the whole car up first on the main spring rates, not bar rates, then stiffen the rear bar only to work on the understeer. Don't mess with the front bar at all yet as the car is too soft overall. I can understand messing with shock adjustments, but IMO shocks are fine tuning dynamics and what I see is a car that needs some static updates. People were always surprised at how much wheel rate I had in my car but it just kept going faster and faster the stiffer I made it 
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