Anyone race 1:1 cars? Drag, Autox, Track

[4u2nv]

The size makes a difference, I went from stock 15" wheels with 195/65/15 tires to 17" wheels 215/45/17 tires, both weighing about the same at a total of 45 pounds. To keep it simple, I gained a bunch of low end torque in first gear, but anywhere past about 5000rpm in first and on, the top end sucked.

One thing to keep in mind, the size of wheels do not make any difference in handling. Like I said, it really comes down to rotating mass which will ultimately effect the power output. The thing that changes the handling is purely the tires. Some really nice grippy tires with a stiff side wall will do wonders for a car. When I had the 17's with s-03's, the handling was crazy compared to stock, I couldn't roll the sidewalls no matter how hard I tried.

Bullshit they dont. Come and take a spin for my truck with my 15's on it, vs. my 22's and tell me they dont. My 22's give my truck a completely different stance. Also like I said before, if the wheel diameter makes THAT much differance on your engine, you should be spending your money on mods instead of wheels.

Oh by jumping from a 16" to a 18" like his bro did is probably the EXACT same size. He said himself that the tires are like rubber bands, so I'm guessing he just substituded tire size, for rim. Sounds like a good trade to me. My 1st set of rims were 20's and they were the EXACT same diameter with the 20 inch rim and tires as my 15 inch rim and tire. My tires on my 20's were alot lower pro than my 15's stockies that were meats.

 

[kwong2001]

They'll make a difference, but it really depends on the car. Still 19's on an STi and you probably won't feel a lot of difference if any, but stick 18's or 19's on a civic, and there will be a HUGE difference.

It's not a matter of diameter, it's a matter of where the majority of the weight is located, think about it, with my 195/65's, i have about a 4-5" side wall with minimal thickness of rubber. With the s-03's that are 215/45's, i had about 2-2.5" sidewall with very thick sidewalls that are designed for around 187mph. Overall, the concentration of weight is higher on the outside.

And I can tell you with my car, I had the exact same diameter tires, or within 5% of stock, and I still felt a difference, and it was a HUGE difference. And like I said, I weighed my stockers vs. the aftermarket 17's with tires, and they weighed the exact same.

Believe what you want, but I know what i'm talking about. It basically has to do with center of gravity and inertia. Which by the way, just to add more stuff you'll probably think is wrong, by going bigger wheels, you'll also overwork (burn up) your brakes a lot easier. Why do you think it's recommended to upgrade the brakes if you upgrade to a vastly different wheel/tire combo?

 

[redneckracer1979]

I have never heard that by going with a bigger wheel to upgrade the brakes but I do nknow that I had to run a hydroboost system with 4 wheel discs in my 69 Blazer. But that might have had something to do with the 40 inch swampers that I ran on it. Still stopped great though.

 

[kwong2001]

It's more with like drastic changes like guys who have 24" wheels coming from something like 17's or 18's.

With my car, when I swapped the 15's or 17's, I had bought upgraded rotors and pads to compensate for the wheels which killed a lot of my braking, unfortunately I parted the car a few days after receiving the rotors.

 

[4u2nv]

Yeah the bigger breaks is definatly needed. The weight is what will make the differance, not the height. In my experiance from 15 to 20's the 20's were alot heavier but I didnt notice any power loss. I did notice the breaks wearing faster and being less responsive, but other than that it handle alot better, cornered alot better and honestly felt like a new truck. Then once I did the break upgrade and the 22's (Which were even heavier btw) I still didnt notice any power loss (But around the same time a super charger was slapped in, so I had some ponies to spare if needed anyway) either way your not gonna lose NOTICABLE power. Honestly I'm thinking its a mental thing. Kinda like the new boost of power a person seems to feel once they installed a new aircleaner. Or the sudden boost a person thinks they feel by putting in premium instead of regular. Lighter wheels are gonna speed ya up physically but will you notice any different times on your track slips? No. Like I said, it takes a little more hop ups than that.

 

[kwong2001]

Granted it really depends on the vehicle's power, but I assure you, in an underpowered car, it is NOT mental. I ran my car before and after on the same uphill road, 50mph by the end with the stockers, 40-45mph with the 17's. Also, with the 17's, first gear could noticably pin me against the seat until about 5000rpm's

And I guarantee you, if you tested the difference using multiple measurements, (0-10, 0-30, 0-60, 1/8 mile, 1/4 mile, 1 mile, top speed) there would be a measurable/noticable difference.

But the change in performance is proven by the simple fact your brakes are wearing out sooner than the stockers. It would defy the laws of physics for your car to have more trouble stopping, but still maintain the same acceleration.

 

[redneckracer1979]

When I had my 69 Blazer with the 40's on it it still acelerated hard enough to pin you against the seat if you floored it. Of course I was running a 450 horse 396 with 4.88 gears in the diffs.

 

[HumboldtBlazer]

17"s are the best for drag and track really. 18"s in some cases where they are light and it fits the car. The STi can handle 19"s but they are ridiculous and 18's look perfect but you get better 60ft and q-mile times with 17"s. My personal opinion anything bigger than a 19" on a CAR is stupid. Now trucks it is different because these are not made the handle.

I have never heard that by going with a bigger wheel to upgrade the brakes but I do nknow that I had to run a hydroboost system with 4 wheel discs in my 69 Blazer. But that might have had something to do with the 40 inch swampers that I ran on it. Still stopped great though.

All I can say is I love my Brembros. Never had brakes like these. They are the real deal for sure. They stop my car for 60mph in 110ft. They save my arse, let's just put it that way.

 

[Rook]

i got a 99 silverado i plan on taking to the track. its a 4.8 v8 5spd reg cab/stepside bed 4x4....its a lot of fun, more fun offroad...

today i plan on picking up a new cam, springs and pushrods for it. than we'll see what it runs at the track. right now I'm 'estimated' at mid 15's hoping with this ill drop to mid 14's or lower....hopefully lower once i get it dynotuned etc.

http://www.cardomain.com/profile/rook99z71 <-- 5cars...

74 pontiac with a 400ci v8 sold
91 mazda b2200 lowered 3/6 sold
02 mitsu lancer slow and loud totalled out
95 pontiac grandam blown engine...rotting in driveway for last 2 yrs
and now my 99 silverado.

got pics and info on every car in my cardomain pages lol

 

[Remy]

FP Red.

I run the Fp Bb version of the red in my talon. Fp 3065. I should cracks 10's soon. I may run next month before the track closes.