Rotational mass

[sage0607]

Does anyone know how much lighter rims would help in say the 1/4 mile. Also how much would let's say 20lbs off rotational mass equate to static weight is it really that big of a difference? I have heard anything from 2x to 4x just wondering if someone had a better explanation to this?

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[EvolutionArmory]

Going from stock wheels and all seasons to lighter wheels and summer tires brought me down to a 3.49 0-60 from a 3.8 at stage 1.

It helps you out the most on the small end of a 1/4 mile which shrinks the big end 😀

[sage0607]

Going from stock wheels and all seasons to lighter wheels and summer tires brought me down to a 3.49 0-60 from a 3.8 at stage 1.

It helps you out the most on the small end of a 1/4 mile which shrinks the big end

Awesome to hear! What kind of weight saving?

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[EvolutionArmory]

And to answer your other question, the rotational weight is directly affecting your drivetrain loss so you’re putting more power that you already make to the ground.

Don’t get hung up on wether or not it makes twice or 3 times as much difference as static weight. Just know that it is more beneficial than pulling weight in every way.


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[sage0607]

And to answer your other question, the rotational weight is directly affecting your drivetrain loss so you’re putting more power that you already make to the ground.

Don’t get hung up on wether or not it makes twice or 3 times as much difference as static weight. Just know that it is more beneficial than pulling weight in every way.


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Kinda my thought process as well thank you for answering. I'm trying to go faster with my a6 actually. I've gone 10.52 at just under 132mph without my nitrous and with the stock 19 inch rims. Also just spare and rear seats removed. Could definitely pull the passenger seat too. Just looking for all the ways to become faster

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[EvolutionArmory]

Lightweight wheels and sticky tires are probably all that’s left for you.

What’s your 60 foot? With a 132 trap, getting your 60 foot down to a crazy low number is probably all you have left 🤣


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[sage0607]

Lightweight wheels and sticky tires are probably all that’s left for you.

What’s your 60 foot? With a 132 trap, getting your 60 foot down to a crazy low number is probably all you have left


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Well I have longtube headers to swap on mattys4 told me those are worth an extra 1-2 mph trap speed. My 60ft is crap according to dragy 1.67 but I've been told dragy isn't good for 60ft accuracy but everything else on it is pretty accurate. I can definitely take more weight off of car too and obviously run my nitrous to cut better time as well but I rarely use it and have never tested it In the 1/4th mile with it

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[EvolutionArmory]

Awesome to hear! What kind of weight saving?

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Went from 26 pounds to 21 pounds. Still a 19 inch wheel though. I wish I bought 18’s though.

If you really want to shrink wheel weight and get better grip at the track, run the smallest wheel size you can with a good sized side wall.

More sidewall flex is better for launching.


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[sage0607]

Went from 26 pounds to 21 pounds. Still a 19 inch wheel though. I wish I bought 18’s though.

If you really want to shrink wheel weight and get better grip at the track, run the smallest wheel size you can with a good sized side wall.

More sidewall flex is better for launching.


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Good to know! I think I will stay with 19s as well tbh. Not worth going smaller size for me on a platform like this

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[EvolutionArmory]

Well I have longtube headers to swap on mattys4 told me those are worth an extra 1-2 mph trap speed. My 60ft is crap according to dragy 1.67 but I've been told dragy isn't good for 60ft accuracy but everything else on it is pretty accurate. I can definitely take more weight off of car too and obviously run my nitrous to cut better time as well but I rarely use it and have never tested it In the 1/4th mile with it

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Dragy 60 foot is usually higher than a slip. It doesn’t account for how deep or shallow you staged, etc.

A Dragy 1.67 is probably closer to a 1.60 on a slip.

If you want to cut those crazy 1.5 60 foots, wheels and tires will help you do that.

Also depends on if that 1.67 was on the street or prep. A 1.67 on the street is actually pretty awesome at your power level.

It’s really hard to hook on the street.


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[sage0607]

Dragy 60 foot is usually higher than a slip. It doesn’t account for how deep or shallow you staged, etc.

A Dragy 1.67 is probably closer to a 1.60 on a slip.

If you want to cut those crazy 1.5 60 foots, wheels and tires will help you do that.

Also depends on if that 1.67 was on the street or prep. A 1.67 on the street is actually pretty awesome at your power level.

It’s really hard to hook on the street.


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1.67 on street with all season tires tires too since I live in snowy state!

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[sage0607]

Dragy 60 foot is usually higher than a slip. It doesn’t account for how deep or shallow you staged, etc.

A Dragy 1.67 is probably closer to a 1.60 on a slip.

If you want to cut those crazy 1.5 60 foots, wheels and tires will help you do that.

Also depends on if that 1.67 was on the street or prep. A 1.67 on the street is actually pretty awesome at your power level.

It’s really hard to hook on the street.


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Also sorry for double commenting on you here but what kind of improvements would doing some radials and say a same size but lighter rims get me roughly?

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[Fresh.S4]

Removing seats to make weight/ drag times is silly lol.

And light wheels ftw!

[EvolutionArmory]

Hard to say. All the guys cutting 1.5 60 foots are on Drag radials. Now you might think cutting a tenth off your 60 foot isn’t a big deal but that tenth can cut 2-3 tenths off your ET.

[sage0607]

Removing seats to make weight/ drag times is silly lol.

And light wheels ftw!

I don't find it silly tbh especially if your someone who is trying to go to the track to get best time possible. Or if your going street racing its very common to remove weight. You can shed an easy close to 200lbs from an a6 just from rear seats and spare. Passenger seat is 60-90 lbs depending on if yoh have ac seats or not. But anyways remove spare is 0 effort also removing rear seats is 0 effort on my car they literally slide off the top piece the you can lift up the bottom piece. Easy as that. 200lbs is 2 tenths of a second for just 3 minutes of work ;) i would actually argue buying lighter wheels to go faster is silly but i'm still gonna do both these things

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[sage0607]

Hard to say. All the guys cutting 1.5 60 foots are on Drag radials. Now you might think cutting a tenth off your 60 foot isn’t a big deal but that tenth can cut 2-3 tenths off your ET.

Well it depends if your cutting your 60ft time by adding more power or simply by having better traction. If its from having better traction you won't gain anything but what you cut in the 60ft. But from power then yes you can cut a lot of time. Just from what I've seen from going to bir a lot

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[EvolutionArmory]

Getting the power your car already makes to the ground better is always the better move in my opinion. I like to get every once of power down before I add more.

Adding more power can actually make it even harder to hook up.


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[sage0607]

Getting the power your car already makes to the ground better is always the better move in my opinion. I like to get every once of power down before I add more.

Adding more power can actually make it even harder to hook up.


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Believe it or not my tires never spin though unless its raining out. Never needed to look at radials. I guess when I use my nitrous it spins in 1st gear but tbh I don't do a whole lot of dig racing since I mainly Street race rwd guys don't hook from dig worth a crap and I'd rather beat them at their best rather than their worst

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[SwankPeRFection]

Believe it or not my tires never spin though unless its raining out. Never needed to look at radials. I guess when I use my nitrous it spins in 1st gear but tbh I don't do a whole lot of dig racing since I mainly Street race rwd guys don't hook from dig worth a crap and I'd rather beat them at their best rather than their worst

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Lol, I thought I was the only one that races from a roll in something that should have the advantage from a dig. Three new C8’s didn’t like me very much since they couldn’t come up to and around me from a 50 roll and the last (4th one) didn’t want to go from a dig or roll. 🤷*♂️

[sage0607]

Lol, I thought I was the only one that races from a roll in something that should have the advantage from a dig. Three new C8’s didn’t like me very much since they couldn’t come up to and around me from a 50 roll and the last (4th one) didn’t want to go from a dig or roll. *

Yes I love racing from a roll I've taken down all sorts of stuff from a roll granted my car is pretty heavily modded.

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