Tire size... - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 27 Old 06-24-2018, 11:05 PM Thread Starter
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Tire size...

Hey folks. I'm planning to finally track my car. I've never tried it and my interest is peaked. What size drag radials or slicks should I run with my combo?

347
3.35 first gear but considering 2.95 Astro
3.73 gears
Engine makes peak hp at 5800
Car hits the fuel cutoff at 115mph in 4th
Car is a '95 GT coupe. Not sure of weight.
I'm 200lbs
Car has fiberglass hood and aluminum heads.


CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
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post #2 of 27 Old 06-25-2018, 10:37 PM
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Slicks or QTPs. You should be able to trap 115 mph, assuming decent heads. If your street tires are typical 25.5" tall, you'd be best served with a 26x8.5 outlaw type slick. I like the Hoosiers and have gone 1.41 60' on them and consistently run low 1.4s. You can get a Hoosier Quick Time pro in 27 by 10.5 which is a 9 inch tread if you want a little bit more room for mile per hour. I ran those too, and got into the mid 1.4s on them as well.

Drag radials won't last as long, will be terribly inconsistent, will be hard on your drive line, and won't recover if you lose traction.


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'84 LTD LX - 9.83 at 140.09. Whippled 365 SBF with a glide and 3.08 gears. Driven to and from the track 60 miles without even changing tire pressure.
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post #3 of 27 Old 06-26-2018, 12:01 AM Thread Starter
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Slicks or QTPs. You should be able to trap 115 mph, assuming decent heads. If your street tires are typical 25.5" tall, you'd be best served with a 26x8.5 outlaw type slick. I like the Hoosiers and have gone 1.41 60' on them and consistently run low 1.4s. You can get a Hoosier Quick Time pro in 27 by 10.5 which is a 9 inch tread if you want a little bit more room for mile per hour. I ran those too, and got into the mid 1.4s on them as well.

Drag radials won't last as long, will be terribly inconsistent, will be hard on your drive line, and won't recover if you lose traction.
Heads are the AFR 185 Renegades.
I currently run 25.5" Nitto 555R's.
My rear wheels are 10.5". Being a newbie; I'm not sure if I want more trap speed using a taller tire. My SLR isn't good with the 3.35 first gear. I definitely need the 2.95 first.
I think when we spoke before; you figured a higher trap speed than my current 115mph limit in 4th.
I don't put any miles on the car so I may just toss on some Hoosiers and run them all of the time on a 17" wheel. The cops don't seem to care here whether tires are DOT or not.
I'm thinking of dropping the road race style suspension and running Strange coilovers up front and shocks in the rear. Mustangs just look so natural dressed in drag.

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
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post #4 of 27 Old 06-26-2018, 05:11 AM
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Are you looking for a tire strictly for the track, or still wanting a dot radial? Not considering legality of a slick on the street, but obviously it’s dangerous and care should be taken. In a perfect world, where money isn’t an issue, I’d have a street set and a race set, but I’m more track oriented, so I went with the qtp’s. I’d think their 26 11.5 r15 flavor would serve pretty good.
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post #5 of 27 Old 06-26-2018, 06:57 AM
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I would not go 2.95 yet. SLR with 3.73 and 3.35 is as low as I would ever go for drag racing. Get some good slicks and try it first and then you can compare if you make a change
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post #6 of 27 Old 06-26-2018, 02:04 PM Thread Starter
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Are you looking for a tire strictly for the track, or still wanting a dot radial? Not considering legality of a slick on the street, but obviously it’s dangerous and care should be taken. In a perfect world, where money isn’t an issue, I’d have a street set and a race set, but I’m more track oriented, so I went with the qtp’s. I’d think their 26 11.5 r15 flavor would serve pretty good.
Here in Phoenix; it rarely rains and I've never drove my car in the rain. I would consider running a DOT race tire full time unless they are too dangerous for the highway. I know the sidewalls are flexy.
Is there an ideal tire width for different hp levels? You mentioned 11.5's which would fit my 10.5" wheels. Will they offer too much bite and add unnecessary rolling mass?

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
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post #7 of 27 Old 06-26-2018, 02:16 PM
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I’ve driven the mickey thompson et Street radials on the highways, and they come in two different tread patterns, the regular radials and the ss. I have yet to drive the qtp’s as I just got them mounted this past weekend. They are more or less a slick with two grooves in them. A friend of mine runs those nittos, and they make a really nice tire, I feel like the compound is too hard and they err towards the street side versus more of a track tire.

Either way, you either have a slick that’s good for the track and horrible for the street, or the other way around.
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post #8 of 27 Old 06-26-2018, 02:33 PM
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I'd run it 3 or 4 times. Full power passes to get a a representative mph at the track. IMO you should run the tallest tire that both fits and that you have the power to turn.

If you run 115 in the 1/4, for example, with a 26" tire you will be through the traps at about 5500-5600.

You will need 4.10's to use all your rpm's with 26" tires.
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post #9 of 27 Old 06-26-2018, 02:36 PM
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Originally Posted by fasterthangas View Post
Here in Phoenix; it rarely rains and I've never drove my car in the rain. I would consider running a DOT race tire full time unless they are too dangerous for the highway. I know the sidewalls are flexy.
Is there an ideal tire width for different hp levels? You mentioned 11.5's which would fit my 10.5" wheels. Will they offer too much bite and add unnecessary rolling mass?
I run a 26x8.5 Hoosier on a 10" wheel. It can pretty much take as much power as you can put to it....once you are moving. The first 60' is critical. I can manage 1.29 60' and run 5.30's @ over 133 mph in the 1/8 on that tire. But you have to have your chassis set up right and be able to manage power on the hit to make them work. So in my opinion, you better be making huge power to justify a bigger tire. Unless of course you don't want to set up the chassis properly, then run some 32x16 steamrollers that will hook on anything short of ice. Just be prepared to take the penalty in lost performance due to all of the mass you are dragging down the track.

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #10 of 27 Old 06-26-2018, 02:46 PM Thread Starter
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Originally Posted by tjm73 View Post
I'd run it 3 or 4 times. Full power passes to get a a representative mph at the track. IMO you should run the tallest tire that both fits and that you have the power to turn.

If you run 115 in the 1/4, for example, with a 26" tire you will be through the traps at about 5500-5600.
Considering that the engine makes peak power just a tad over 5800; is the 5500-5600 trap speed a good thing?


CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
Buyer Beware.
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post #11 of 27 Old 06-26-2018, 02:53 PM Thread Starter
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Here in Phoenix; it rarely rains and I've never drove my car in the rain. I would consider running a DOT race tire full time unless they are too dangerous for the highway. I know the sidewalls are flexy.
Is there an ideal tire width for different hp levels? You mentioned 11.5's which would fit my 10.5" wheels. Will they offer too much bite and add unnecessary rolling mass?
I run a 26x8.5 Hoosier on a 10" wheel. It can pretty much take as much power as you can put to it....once you are moving. The first 60' is critical. I can manage 1.29 60' and run 5.30's @ over 133 mph in the 1/8 on that tire. But you have to have your chassis set up right and be able to manage power on the hit to make them work. So in my opinion, you better be making huge power to justify a bigger tire. Unless of course you don't want to set up the chassis properly, then run some 32x16 steamrollers that will hook on anything short of ice. Just be prepared to take the penalty in lost performance due to all of the mass you are dragging down the track. [IMG class=inlineimg]/forums/images/Corral_net_2015/smilies/tango_face_wink.png[/IMG]
It's just your typical 347 with no power adders. 389rwhp on a 105 day. From what I've been reading; soft slicks don't like the AZ road heat. The tires would fling rocks like crazy and my lower quarter panels wouldn't look so nice. I mostly drive the car in the evening but the roads retain heat for hours after the sun goes down. That's why you'll find rattle snakes stretched across the road at night.

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
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post #12 of 27 Old 06-26-2018, 03:14 PM
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Well, you ruined Arizona for me, I used to think of it as a rust free Mecca of vintage vehicles. Now all I think about are rattlesnakes on the road.
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post #13 of 27 Old 06-26-2018, 03:29 PM Thread Starter
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Well, you ruined Arizona for me, I used to think of it as a rust free Mecca of vintage vehicles. Now all I think about are rattlesnakes on the road.
Haha!!! Gila Monsters too!
I love AZ. I've been here 30 years and only seen a hand full of rattle snakes. The only reason I saw those is because I was into dirt biking and Jeeping. The rust free cars here are amazing as long as the younger crowd doesn't butcher them.

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
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post #14 of 27 Old 06-26-2018, 04:34 PM
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Considering that the engine makes peak power just a tad over 5800; is the 5500-5600 trap speed a good thing?
Neither good nor bad, IMO. You are just giving up a little potential at the very top of the track. On a less than all out race car, I doubt it would matter. Unless you are the kind guy that wants every hp and RPM to be used.
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post #15 of 27 Old 06-26-2018, 04:45 PM Thread Starter
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Neither good nor bad, IMO. You are just giving up a little potential at the very top of the track. On a less than all out race car, I doubt it would matter. Unless you are the kind guy that wants every hp and RPM to be used.
Cool. Good to know. What calculator do you use to figure RPM at end of 1/4 mile?

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
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post #16 of 27 Old 06-26-2018, 08:19 PM
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Cool. Good to know. What calculator do you use to figure RPM at end of 1/4 mile?
Wallace Racing - Automotive Calculators


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1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #17 of 27 Old 06-26-2018, 10:34 PM Thread Starter
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Cool. Good to know. What calculator do you use to figure RPM at end of 1/4 mile?
Wallace Racing - Automotive Calculators


Enjoy[IMG class=inlineimg]/forums/images/Corral_net_2015/smilies/tango_face_smile.png[/IMG]
Thanks!

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
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post #18 of 27 Old 06-26-2018, 10:41 PM
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Well that's kinda why I said I'd run it a few times. Once you know what mph you are turning, you can use the following

3.73 * mph / 26" x 336 = rpm

My last Mustang that I ran at the track trapped at 100 mph but the indicated mph in the car was 110 as it was still accelerating through the finish line.
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post #19 of 27 Old 06-26-2018, 10:52 PM Thread Starter
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My last Mustang that I ran at the track trapped at 100 mph but the indicated mph in the car was 110 as it was still accelerating through the finish line.
I don't understand the speed discrepancy. I'm old.

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
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post #20 of 27 Old 06-26-2018, 11:15 PM
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1/4 mile terminal speed is measured over a distance of (I think) 66 feet at the end of the track. If you are still accelerating through this "trap" you get a trap speed that is different from you speedometer at the finish line.

Personally I don't see why they can't make the finish line speed true with today's technology.
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post #21 of 27 Old 06-26-2018, 11:48 PM Thread Starter
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1/4 mile terminal speed is measured over a distance of (I think) 66 feet at the end of the track. If you are still accelerating through this "trap" you get a trap speed that is different from you speedometer at the finish line.

Personally I don't see why they can't make the finish line speed true with today's technology.
That just seems wrong. Your speed is your speed. I'm glad that I started this thread as I'm learning quite a lot.

Have you ever gone down state and raced at Lebanon Valley?

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
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post #22 of 27 Old 06-27-2018, 08:10 AM
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That just seems wrong. Your speed is your speed. I'm glad that I started this thread as I'm learning quite a lot.
I think back in the day when drag racing started they didn't have a good reliable quick way to get the terminal velocity so they used trap speed. It remains to today. Because.....tradition. I would like to see terminal speed added to the time slips.

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Have you ever gone down state and raced at Lebanon Valley?
No. I have only ever raced at one track. I've been to other tracks, but not raced at them. My pockets are too shallow to race competitively even at one track. So I make runs for fun. Besides, anytime I do something that involves "winning", it becomes less and less fun as I get more and more competitive and I start to hate whatever it is I am doing unless I am winning. So if I enjoy something, I don't allow it to become a competition activity.

I grew up in a small town called Leicester (less-ter) about 40 minutes South of Rochester and in my home town was/is a drag strip called Empire Dragway (formerly New York International Raceway Park). Real nice 1/4 mile track. So that's where I go. Sadly they are running 1/8 mile almost exclusively unless you go to test n tune nights. I despise 1/8 mile drag racing. Hate it. But that is another story for another thread and it's not popular with some people. It's an opinion thing.
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post #23 of 27 Old 06-27-2018, 03:36 PM
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Well, you ruined Arizona for me, I used to think of it as a rust free Mecca of vintage vehicles. Now all I think about are rattlesnakes on the road.
Yah!! one less transplant.. haha j/k

You'de hate the constant sunshine, low humidity and no bugs too :-)
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post #24 of 27 Old 06-27-2018, 03:49 PM Thread Starter
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Yah!! one less transplant.. haha j/k

You'de hate the constant sunshine, low humidity and no bugs too :-)
LOL!

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
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post #25 of 27 Old 06-27-2018, 07:15 PM
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I visited a friend in Phoenix in August....it was like taking a vacation in my oven with the temp set on High!

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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post #26 of 27 Old 06-27-2018, 07:28 PM Thread Starter
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I visited a friend in Phoenix in August....it was like taking a vacation in my oven with the temp set on High!
Haha! I'm originally from the Northeast, but I slowly got use to the heat here. The secret is to go where the AC is.
I camped in Bangor back in the 70's on the way to Prince Edward Island. Pretty country.

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
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post #27 of 27 Old 06-27-2018, 07:48 PM
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Yeah, I wondered why he wanted to go out to the garage at midnight to work on his Saleen and he said it was the only time of day it was cool enough to work in the garage. Lol. Not for me. Hell I am still trying to get used to the humidity that we have here in Maine. I was spoiled by the temperate weather in Washington.

1989 Saleen 414 358cid SBF 2.8L Kenne Bell S/C
26 X 8.5 Hoosier
Best 1/4 mile time 8.623 @ 159.82 mph with a 1.34 60' (5.57 1/8th at 128)
Best 1/8 mile time 5.339 @ 133.46 mph with a 1.29 60'
08' Bullitt #4097 N/A 340ish RWHP <<<<<FOR SALE!
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