Brian Finch and I did some testing last month and since our cars are essentially the same it was easy to do. He has (had) a 335 front tire and I have a 315. We swapped cars and I notice his car had quite a bit of oversteer on turn in, he was surprised at how much more balanced my car was. We swapped my wheels onto his car and it cured the oversteer with no other changes. Imho there's a point where you have too much front grip and it upsets the balance of the car.
Okay I am not a suspension guy and I don't claim to be either. However look at the new Z28 and it has 305's all the way around.
I've talked with the Lotus guys (Suspension & Chassis Engineer) for year about suspension and chassis design and they all agree more isn't always better. There is a balance and before you figure out the balance you have to know how to tune a suspension which I am willing to bet 99% have no clue how to actually do it.
I also talked with a couple guys at Ride-Tech at Sema and the subject of 295's all the way around came up and they thought it was a good idea and now you just have to figure out if all 4 tires should be the exact same height or should they be staggered. Lots to think about and I know there is a post from a couple years ago that I made that had some great information.
My future plans with my car is to run 295's on all 4 corners and spend a bunch of time tuning the suspension with someone that really understands how they work.
There are so many things to consider and I think it would be great if one of the experienced guys to chime on with suggestions as to what they think about the tire pressure, Spring rates, rebound, dampening, weight bias & so on as I really would like to learn as much as I can over the winter so I don't look like an idiot next year when we start to thrash on my camaro.
__________________ marty-mj
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Why not increase rear grip to balance the car instead of limiting front grip?
Agreed.
I believe both of you run the DSE rear...lower the panhard bar. I know it is not adjustable, but you could make it that way.
What is the track width on both cars? He could also increase track width in rear to tighten the car up...acording to Ron Sutton's teachings.
That is stated backwards. Narrowing the rear track will tighten the car up. Widening the rear track would free/loosen the car up. If I have stated incorrectly somewhere in my posts, please point it out so I can correct it.
you not increase rear grip to balance the car instead of limiting front grip?
I believe both of you run the DSE rear...lower the panhard bar. I know it is not adjustable, but you could make it that way.
What is the track width on both cars? He could also increase track width in rear to tighten the car up...acording to Ron Sutton's teachings.
Payton, we have spent a ton of time working on different set-ups with the shocks and springs, we've made it pretty good. I like my car a little on the loose side but not on corner entry. Brian tried all of my shock and tire pressure settings and could never get his car as well balanced as mine.
Quote:
Originally Posted by syborg tt
Okay I am not a suspension guy and I don't claim to be either. However look at the new Z28 and it has 305's all the way around.
I've talked with the Lotus guys (Suspension & Chassis Engineer) for year about suspension and chassis design and they all agree more isn't always better. There is a balance and before you figure out the balance you have to know how to tune a suspension which I am willing to bet 99% have no clue how to actually do it.
I also talked with a couple guys at Ride-Tech at Sema and the subject of 295's all the way around came up and they thought it was a good idea and now you just have to figure out if all 4 tires should be the exact same height or should they be staggered. Lots to think about and I know there is a post from a couple years ago that I made that had some great information.
My future plans with my car is to run 295's on all 4 corners and spend a bunch of time tuning the suspension with someone that really understands how they work.
There are so many things to consider and I think it would be great if one of the experienced guys to chime on with suggestions as to what they think about the tire pressure, Spring rates, rebound, dampening, weight bias & so on as I really would like to learn as much as I can over the winter so I don't look like an idiot next year when we start to thrash on my camaro.
Marty, it will really depend on what is comfortable for YOU to drive. Different tires like different pressures, the Rivals seem to have more lateral grip at higher pressures and more forward/braking grip at lower pressures.
Brian Hobaugh SCCA National Tour June 2014
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