So I am a little puzzled by my ET and mph now that I have stock 22lbs wheels on slicks.
I ran 13.1 @ 102mph.

2 years ago, I ran 12.8 @ 105 with some 12lbs wheels on the same sized slicks.

No other changes and the car just got retuned and is driving much better now.

Does 10lbs per wheel make that much of a difference?

 

20 lbs of weight off of wheels will make a huge difference

 

While they aren't really 'free', lightweight wheels is the free-ist and best way to gain power.

That being said, there are so many things that come into play about your track times that you can't just look at the wheels as changing things around. Track prep, weather, driving, etc. all make a huge difference. Do you remember what your short track looked like on the old pass vs. the recent pass?

 

By short track, do you mean my 60ft time?

It was 1.7 60ft and the 13.1 pass was also a 1.7 60ft.

I did manage a 1.698 60ft on my 3rd pass but I miss shifted which would have gotten me back to the 12's but I shouldn't need that. I did 3 passes and all 3 were 102mph even with a miss shift. I'd say track prep was great considering the 1.6 60ft on a 2850lbs all motor prelude.

 

Would you say a huge enough difference to slow me down 3mph and .3 at the end of 1/4 mile?

 

i think it has more to do with your driving than the 10lbs difference... u should record all your track passes outside & in cabin it helps you see what slight differences u probably have done... it helped me realize i shifted 100 rpm sooner on one pass to the next pass, left the hole staying in 1st gear a 1/3 second longer than another pass....track prep has alot to do with it...could be something as simple as a vacuum/IC piping leak robbing small power (if turbo)

 

it's NA.
I shift when the shift light comes on.
mph was the same on all 3 passes.

 

^ In that case then yes... that weight savings helps... all motor cars can always improve ET with weight reduction. stuff like running on less than 1/4 tank of gas, taking out passenger seat, no spare in the car, i would have to know what your race weight was for both passes that would let you know alot also.

 

I ran without the hood, less then 1/4 tank of gas, passenger seat out, no spare.
I'm going to remove all the sound deadning from the car soon too with the dry ice method and also remove ABS.
Car was 2800lbs with me in it and was the same 2 years ago.