From 18's to 19's, should i be accelerating faster or slower?
04-11-2006, 02:04 PM
#21
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Originally Posted by Kolia
We'll, in a straight line and assuming no wheel spin, sure, the lighter the better.
But there are so many forces at work dynamically, that a generalization can't take all situation into account. Cornering for exemple. The less sidewall, to more talkative the steering will be. The rim width will play also, as well as the offset and it's effect on the srcub radius...
The problem for us is that we don't custom design our wheels. We have to take a set with fixed compromises. That's why I say that taking the weight only into account is not great.
My 17" are for the track only. They are 255/40R17 and 275/40R17
For the street, I have my OEM wheels with 235/40R18 and 255/40R18
But there are so many forces at work dynamically, that a generalization can't take all situation into account. Cornering for exemple. The less sidewall, to more talkative the steering will be. The rim width will play also, as well as the offset and it's effect on the srcub radius...
The problem for us is that we don't custom design our wheels. We have to take a set with fixed compromises. That's why I say that taking the weight only into account is not great.
My 17" are for the track only. They are 255/40R17 and 275/40R17
For the street, I have my OEM wheels with 235/40R18 and 255/40R18
04-18-2006, 03:07 PM
#23
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on my BMW 325ci, i went from the stock 17s to multipiece 19s that were probably about the same weight (if not lighter) and my car slowed down noticeably. its very sluggish off the line and burns gas like a mother in the city (dropped about 3mpg average, fwy mpg stays the same).
i was hoping i would have less of a problem with the Z as the engine is alot larger and torque is less of an issue... but i'm thinking of going from the stock 18s to 20s, so i'm probably SOL haha.
i was hoping i would have less of a problem with the Z as the engine is alot larger and torque is less of an issue... but i'm thinking of going from the stock 18s to 20s, so i'm probably SOL haha.
Last edited by beggohbee; 04-18-2006 at 03:14 PM.
04-20-2006, 09:32 AM
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Originally Posted by Strife350z
rotational inertia
doesn't matter if the static mass of your 19s is lower than the static mass of your 18s
the fact that MORE of the weight has been moved further OUT towards the circumference of the rim means that your car WILL have a harder time turning it
doesn't matter if the static mass of your 19s is lower than the static mass of your 18s
the fact that MORE of the weight has been moved further OUT towards the circumference of the rim means that your car WILL have a harder time turning it
Example: How do you walk better carrying a box;
1- with the box against youre chest or
2- with a box being carried with your arms extended?
I think #1.
04-20-2006, 09:39 AM
#25
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I just wrote an article called "The Ultimate wheel Guide" on these issues in the spring issue of Sport Z Magazine. Check it out, on pg 48 in the mag. I think you will find it helpful....
Jeff Wisener
Jeff Wisener
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