Better 60’ - 330’ Times

[GrayMater22]

What 60’ - 330’ is anyone getting with a uhp 28” tire 295/35r20 and/or 27.4” tire 305/35r19 with an n/a bolt on, roughy 500 whp, 10r80 with 3.15’s. Both tires super pilot sports. I am not looking for a drag radial. I have run the low 12’s with 275/35r20’s, just sick of pedaling thru the 330’ before I can let her eat.
If I go to 19”s = total wheel replacement, I have read there might be more advantage with increasing height and width over just increasing width?

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[WildHorse]

You want 60's with street radials ?

 

[GrayMater22]

You want 60's with street radials ?

Yes, this is a street car that occasionally hits a fairly well prepped track.

 

[WildHorse]

Yes, this is a street car that occasionally hits a fairly well prepped track.

Dunno what to tell ya other then get that IRS to plant hard.
Softer rear shocks, softer rear springs, front shocks that's
super tight on the compression.

 

[Pistol_91]

Better suspension. Drag radial

 

[GrayMater22]

Dunno what to tell ya other then get that IRS to plant hard.
Softer rear shocks, softer rear springs, front shocks that's
super tight on the compression.

I appreciate the response, but that was not my question. I already have irs alignment, braces, 800/200 lb springs. The question was about tire height and width, because it does make a significant difference and obviously drag radials would improve some, but this will remain a street car in FL and uhp summer tires hook decent here, there was only 2/10’s difference between me on 275/35r20 ecs02’s and a gen7 with 305/35 drag radials. I was running high 11’s and a 1.67 60’ with a bone stock 392 Charger with 305/30r20’s, but that car gave up mph on the big end due to the shorter tire. I know there are some experienced guys on here that have experienced this. Just trying to make a decision to spend another $900 on rear wheels or $1800 going to 19”s.

 

[robvas]

Going to the same tire, but a little butter probably won't help much.

You will see more improvement from a 150lb front spring and some drag oriented shocks

or just suck it up and run a DR

 

[GrayMater22]

Going to the same tire, but a little butter probably won't help much.

You will see more improvement from a 150lb front spring and some drag oriented shocks

or just suck it up and run a DR

I’m looking at going from a 275/35r20 to either a 295/35r20 28” or a 305/35r19 27.4”, that is the question. The 295 is wider and taller, the 305 is just wider, but .2” shorter.

 

[robvas]

I’m looking at going from a 275/35r20 to either a 295/35r20 28” or a 305/35r19 27.4”, that is the question. The 295 is wider and taller, the 305 is just wider, but .2” shorter.

Yup. that's why I said going to the same tire, but slightly bigger, isn't going to make much difference. Sure the contact patch is slightly bigger and your gearing is slightly reduce but it's still going to be spin city until you get a different compound.

 

[GrayMater22]

Yup. that's why I said going to the same tire, but slightly bigger, isn't going to make much difference. Sure the contact patch is slightly bigger and your gearing is slightly reduce but it's still going to be spin city until you get a different compound.

Currently running ecs02’s, if I go 305’s I would have to move to mpss’s, both tires are about as sticky uhp summer tires as you can get without going drag radial (which I am not going to do). I can easily launch with the 275/35’s without blowing them off, I guess the real question is what tire height would work better with 3.15 gears to get thru the 60’ thru 330’. When I had my 392, going from 275’s to 305’s made a huge difference in my 60’ and 330’, but suffered past the 1/8 (mph) due to being shorter tire.

 

[robvas]

I can't see how the shorter tire would hurt you in the 1/8th "because of mph"

you're not going past your 1:1 gear

 

[GrayMater22]

I can't see how the shorter tire would hurt you in the 1/8th "because of mph"

you're not going past your 1:1 gear

It’s simple shorter tires rotate faster with a higher rpm and cover less distance, taller tires does the opposite, you cover more distance with a taller tires at the same rpm. So once your hooked tire height has a lot to do with it. Thats why drag cars have tall wide tires, it is a well known concept in drag racing. That is why MT ET street r’s 305/45/17 28” are so popular, it’s not just the compound, it is width and height.

 

[GrayMater22]

I can't see how the shorter tire would hurt you in the 1/8th "because of mph"

you're not going past your 1:1 gear
[/QUOT
Shorter tires help in the 1st 1/8, then slow you down on the big end.

 

[WildHorse]

Thats why drag cars have tall wide tires, it is a well known concept in drag racing.

Drag tires also grow in height, something street radials won't do.

 

[robvas]

It’s simple shorter tires rotate faster with a higher rpm and cover less distance, taller tires does the opposite, you cover more distance with a taller tires at the same rpm. So once your hooked tire height has a lot to do with it.

A shorter tire causes you to accelerate faster. Just like shorter gears.

you're not going to slow down until you get into high enough speeds to need to go past your transmissions 1:1 gear

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