senicalj4579

iTrader: (41)

Is there a rule of thumb in 1/4 time thats used when going to lighter wheels?

Right now my wheel setup is 198-200lbs and thinking about picking up some 15x3.5 and 15x10 weld draglites.
My car right now did a 11.918 and im wondering what the car can gain just from a wheel change. It would be cool to get on the top 50 all time bolt on only list. #50 is 11.74. What do you guys think?

custm2500

iTrader: (11)

Very good chance bigs and skinnies should get you .2-.4. Especialy if you are having any traction issues right now. They should be solved.

bottlefed01z28

iTrader: (21)

Big and skinnies is usually more of a constancy thing usually for like said before for traction issues. As far as gains r concerned for weight if I'm not mistaken it's .1 for every 100lbs lost.

senicalj4579

iTrader: (41)

On my 2 11.9 passes I didnt think I spun at all.


Normally 100lbs lost is about a .1 but in this case the weight is lost from the wheels/tires and I think its called unsprung weight? I have seen some formulas (some different than others) and one is weight loss from wheels xs 4. I guess what they are trying to say is for every lb of unsprung weight loss (which would be tires or wheels) is equal to 4lbs or something like this?
Im pretty sure the Bogart guy has his formula on here somewhere ill have to look for his posts.
I just thought an experienced drag racer on here would be able to give me a good estimate.

Also FWIW the da was -187 when I did the 11.9s and in a couple weeks I expect the da to be in the -1000 range so that will help so I figured the drag pack would or should put me on that top 50 list.

djfury05

iTrader: (30)

I just raced the other night again.. I lost 2.5-3 mph by running my ZR1's up front instead of skinnies.. definitely worth running them but I was lazy and didn't swap over lol! Kinda upset I didn't now

senicalj4579

iTrader: (41)

How close were the da's from eachother? Can you without a doubt say you lost an honest 2.5-3mph?

djfury05

iTrader: (30)

The DA for the skinnies was -521ft.. the DA the other day was 168ft. I'd say an absolute honest 2-2.5mph because I hit the limiter on both runs the other day lol.

SmokedOutZ28

iTrader: (35)

I don't notice a MPH drop or gain when running TT2's vs Drag wheels. Depending on the type of setup you get you could see lost.

Traction and consistancy will be your biggest gain of all.

custm2500

iTrader: (11)

I am willing to bet that track prep will have a large weight on how much skinnies up front will help. A track with not a ton of prep obviously isn't all that sticky. Last year after a big drag event we were all able to go down on the track. They had top fuels running so you know track prep was dead on. It was so sticky it was like walking in sand that you sank to your ankle in every step. It seemed to easily add 15 lbs to the feel of lifting my foot each step.

A skinny tire putting down not much contact patch vs. a stock or extra wide tire is going to have a massive effect.(by massive I mean conpaired to the weight) I would love some science on rolling a skinny vs. a 6-10 in tire down the track. It would be the only way to prove my hypothisis.

Improving your sixty .1 is .3-.5 at the stripe. So if weight transfer, traction, or just the weight shave .1 from your sixty you gain big.

There are a thousand other pros and cons of bigs and littles but I would think .2-.4 is a logical expectation with a good chance to see more in most cases.

RamAir95TA

iTrader: (2)

There are alot of assumptions being made in this thread that I don't think is fair to the OP. Saying a tenth off of your 60' is worth .3 to .5 on the big end is ricer math.

FWIW, I gained half a tenth and half a MPH by changing from 16x8 ET streets and stock fronts to 15x3.5s fronts and 15x8 rear ET streets on the same day in the same weather conditions, with the 60s's being within .03 sec.

senicalj4579

iTrader: (41)

What do you guys think if I just got some 15x3.5 draglites on the front and ran them with my current 17x9 zr1s on the rear. I have mt drs 275 40 17.
Thats like 40-50lbs off the front wheels.

Jay-P

iTrader: (16)

I've ran that way in the past. At the time i didnt have enough time to grind the rear calipers to fit the dl's in the rear.

Any unsprung weight you can shed is going to help.

Dirty Vegas

iTrader: (12)

#50 is lower now. The list is never updated. Check the last page of that thread.

senicalj4579

iTrader: (41)

Thanks JP yes and these skinnies cone with 1/4 spacers so no grinding "I think?"

AND yep your right lol
Looks like 11.730 is #50 now. So I need .188 to tie that.
Think I could get almost .2 with about 1000 less da and losing 50lbs on front tires?

Jay-P

iTrader: (16)

I have 1/4 spacers up front, so no grinding needed, and just grinding in the back, no spacers back there.

djfury05

iTrader: (30)

Senical I will most likely be going back to the track this Friday again but WITH skinnies this time so we will see what happens. The weather is forecasted to be the same so I assume the DA will be very comparable.

custm2500

iTrader: (11)

It is not ricer math. It is been shown many times over and you are the first person to claim it is ricer math. It is virtualy a garentee.

Like your improvements show there are plenty of other feet to make improvments that lower your e.t. but the first 60 have the largerst effect on your et generaly.

AChotrod

iTrader: (17)

I agree with you. 100% I say maybe a tenth if the traction is the same.

buzz12586

iTrader: (17)

So going from a 2.0 to a 1.9 is the same as going from a 1.3 to a 1.2?

The Guy in MY 99TA

my old setup didnt run any more than .05 faster from 17" ws6 wheels w/ 315 nittos out back to 15x3.5" drag lites up front w/ radials on the front and 15x8s on the back w/ 26x10.5 et streets.