Ok so last time I was out at the track I had a completely full tank of gas, 50lbs of extras in the car that i forgot to take out and I was running with stock rims 345NT05R Radials out back. I ran a 12.150 @118.05 in 5500 Da.

Next week I'm going back to same track again with a new wheel setup and a few other changes like removing all stock wheels/tires and going to use a 18x4 cts spare with M&H Racemaster tires up front and C5ZO6 17x9.5 rears w/Hoosiers 315's in back. I also took out my pass seat,all 3 floor mats,and the extra 50lbs sitting around in car. I will also go with a empty tank with 1-2 gallons in it. If the track conditions are the same and the DA is the same what kind of gains could be had from the above changes?

I heard skinny are worth .1-.15 ET & and + 1-2 mph, and the rears .3-.5 ET & 3-5 mph. I also removed 200lbs in total car weight from seat, car items, and gas so .2-.25 ET & 2+mph

So are gains of .6-.9 in ET and 6-9 mph realistic or not? What do you think my gains will be?

 

I don't know what the gains will be although they should be substantial. I would not run with that little gas though. You could starve the pump under heavy acceleration.

 

high mid 11s 2-5mph give or take.guess your fillin lucky running 2 gal. in there.I wouldnt if I was you.

 

100%

Solid 11s at roughly 120mph for sure, just not sure how far into the 11s it will be.

 

Ok I will run 4-5 gallons then to be safe. Also I didn't include the tires/wheel weight loss. The wheel/tire change lost an additional 88lbs of rotating mass totaling to around a 288lb of combined weight loss for this up coming pass.

 

just run 1/8 tank and put a little in before each run

 

Out On a limb here, I say 11.7 @ 120 in your DA

 

11.8 @ 120

 

You're going to be EXTREMELY disappointed if you think there's a chance of running .9 quicker and 9mph faster.

I'm not sure why you think your new rear wheel/tire setup will pick up a half second of the NT05Rs?

My guess is .3-.4 and 3mph if you're really removing almost 300lbs

 

11.65 @121 if the humidity is not up. The weather is bad now with the monsoons.

Mike V

 

I'm only saying that because my car has already trapped 119.49 mph out at this same track last year when I was only a H/C/I car with 440hp/420tq to the wheels with non drag radials. but at that time last year I had no wide body kit, z06 brake system,or wheels or a few other weight additives. The car actually was faster when it was heads and cam car than it is now with stroker motor and stock Z06 size wheels. but I'm positive that's due to the added weight of the wheels and brake system because when I was at the 440hp level on base c6 wheels the car would spin like crazy in 2nd gear all the way up to 85mph! Once I put on the wide body kit and the Z06 rims/tires/huge calipers my car wouldn't even do a burn out from a stop no matter how hard i pushed on gas and foot braked it!! It would only do a burnout if i was in a water box. Now when I went I put a bigger cam,stroker motor,stalled yank, the car finally did burnouts again with the Z06 size setup. So I know the tires were killing my car like crazy! So I went out last night for a test run on my street with the skinnys and the 17x9.5 wheels with hoosiers and the car acted scary fast and felt just like before with stock size tires but with so much more force than before that I got a little worried I might loose control and decided I would not try that again unless I really knew what I was doing because the tires broke loose again once car shifted into 2nd. The wheel and tire change feels like I added 50HP no joke!

 

Unless his previous 12.15 was not hooking.

 

FNBADAZ06 said he gained .3 ET and 3mph just from switching to the 17x9.5 C5 Z06 rims and hoosier 275 tires from Z06 size tire/wheel? He said he heard most gain a .3-.5 in et and a .3-.5 in mph?

 

Whenever my friends cars spin off the line and they stay in it for the whole run they have a faster time. He was runnign 11.9@113 but at 12.2 was getting 114-115 mph

Good luck.

Interested in seeing the outcome!

 

Check your post.. they DO NOT have a faster time.. they have a SLOWER time.. but have a MORE MPH or higher SPEED .. .. NOT ET !!

 

I agree.

 

As long as you're keeping an eye on it with HP Tuners you'll be fine running with less fuel in the tank. I've made tons of passes with as little as 1-1/2 gallons in the car and have never hade and problems.

 

You must be mistaken, as he didn't have Hoosiers until I gave him my old ones. He had already run 11.0x before that.

We've played together quite often and I don't ever remember him gaining .3-.5 in one fell swoop.

Maybe he mentioned that I ran .3 quicker with the Hoosiers than he did with MT when we went to Sacramento.

 

My bad. Fast fingers and slow mind, amirite? haha

Every time they would run a slower ET due to spinning they would have a slightly higher trap speed.

Worked till 8:30 last night....leave me alone! lol

 

Sorry but he sent me a p.m. that i still have saying to expect at least a .3 in ET and 3mph from the C5Z06 rear setup and .1+ ET and 1mph from the CTS spare wheel setup that he just sold me. Unless he was tired or something and didn't realize it then ok but those are his words to me. That was the only reason why I was making that statement guess of that much gain. My guess now then is I will gain .4-.6 ET and 4-6 MPH since I already have trapped 119.49 with that size rim out back before with lower power last year. Because I know my tire/wheel combo is killing my launches. i had to mod my motor again and throw a bigger cam/stroker kt in it just to get the car to do burnouts again with those big *** wheels.

Also is it true that when you increase your 60fts by say .3 ET that you also gain another at least another .15 in the other end?