Let me hear for those who are running the M/T Pro Bracket radial. Pros? Cons? Specifically the 31x13 or 32x14. My Lamplighter project, 2950 - 3000 pounds with driver, 5.90s et range

You might look at this thread.

https://drr.infopop.cc/eve/foru...912/m/2557045286/p/1

quote:

Originally posted by Larry Woodfin:
Let me hear for those who are running the M/T Pro Bracket radial. Pros? Cons? Specifically the 31x13 or 32x14. My Lamplighter project, 2950 - 3000 pounds with driver, 5.90s et range

This is RACERVX54's car, nice ain't it? I'll use his car to tell ya what I know.

A dude I built a 23 sbc 434 for ran 5.50's in 2008 on gasoline with a Nova real similar RACERVX45's. 2009 he switched to methanol and slowed down a tenth. Bought another 434 from a nationally known engine builder and for some reason slowed down another tenth, still on methanol.

Fast forward to 2-3 weeks ago he texts me a pic of his car on the bumper and a timeslip in the 5.50's with radials on the car that look about the size of the bias slicks RACERVX54 runs, like I said the cars are very similar but I can't say exactly what size radial tire he had on the car in the pic on the bumper. The car was going 5.60's on bias tires. He says the radials are better but then again my question is, will he be saying that in the middle of the summer??? He likes em though, says they're crazy consistent too.

None of it surprised me, radials are faster. less rolling resistance.

Little to no deformation on a radial in comparison to a bias, for less rolling resistance. Plus radials don't grow so the effective gear ratio is unchanged throughout the run, multiplying more power at the back tire for a better overall power average relative gearing in play.

I ran the 13/31's for 18 months...I had no issues with them...I liked the fact that they held air very well...lost maybe a pound every 3-4 months...my car did pick up a bit in ET...one thing folks don't talk about is the rpm increase...mine went up about 300 in the 1/8th...no tire growth as mentioned...I run 5:13 gears out back...

I had a spinning issue so I switched back to 14/32 stiff sidewall slicks...turns out it was my suspension so I am thinking of going back to the 14/32 radial slicks next...btw, had I left the radials on I probably would have gotten 250 passes out of them...I ran 17 lbs. of pressure in mine...my car weighs 3200 lbs. with me in it...

quote:

Originally posted by Mike Rietow:
Little to no deformation on a radial in comparison to a bias, for less rolling resistance. Plus radials don't grow so the effective gear ratio is unchanged throughout the run, multiplying more power at the back tire for a better overall power average relative gearing in play.

Have you run Radials Mike? I know some here have ran them with Good performance.

quote:

Originally posted by RacerVX54:

quote:

Originally posted by Mike Rietow:
Little to no deformation on a radial in comparison to a bias, for less rolling resistance. Plus radials don't grow so the effective gear ratio is unchanged throughout the run, multiplying more power at the back tire for a better overall power average relative gearing in play.

Have you run Radials Mike? I know some here have ran them with Good performance.

No sir I haven't tried them. I thought about going with them when I built the engine in 2017 but what happened was I had a ten year old set of 10" bias M/T's on the car, and a buddy of mine chuckled when I told him the car would dip in the 5's N/A, well when he chuckled I upped the anty and said not only will it dip in the 5's, it'll do it on 10 year old harder than woodpeckr lips tire LoL. So anyway we made a few hits on the engine, on video with the 10 year old tires. The first thing I noticed on video was how well the old tires laid down tracks. Well we were worried about wheelstands from the start so when I bought a set of new tires I set the shocks up for a super tight track (wheelspeed) in order to avoid wheels stands. You can't do that with a radial because of its weight and low to no deformation working characteristic in comparison to a bias slick. So 6.01 was as quick as I could go on the ten year old harder than woodpeckr lips tires first night out and then the car dipped in the 5's N/A first time out on the new tires. We raced it a couple weeks later Lights Out 8 off the trailer no time run. Man that was a good time getting into a race like that no time run last minute not really knowing much about the car at all. Funny thing was, it ran within a thou to the 330ft of what it did two and a half weeks earlier at Bradenton.

I took the easy road to the 5's with the bias slick. It'll definitely go quicker on radials with a little work.

I'm just a small tire, footbrake guy, but I'll never put bias tires on my car again. I love the PBR's.

I have heard some negative reviews on the larger tire, but the smaller sizes are the berries.

The only issues I've ever had personally are in colder weather. I've found I need a little more aggressive burnout. The hotter and greasier the conditions, the better they work. I'm running 6.50's with low 1.4x 60's.

Hope this helps.

Can someone list any door cars running 6.3x or faster that have won large money ($10k or more) 1/8 mile ET Bracket Races in 2019 using radials ?

I understand the majority of door cars are on bias ply tires, and assume there is a good reason why…. like maybe not having the perfect car, or the best conditions to run on at times.

Ok, I think this is a stupid question, but these seem to work well on light to heavy door cars how come no one is running them on heavier bracket cars. Like 2100 LB alterds?

quote:

Originally posted by Quick Dawg:
Ok, I think this is a stupid question, but these seem to work well on light to heavy door cars how come no one is running them on heavier bracket cars. Like 2100 LB alterds?

dawg, you think 2100 lbs is a heavier bracket car?

quote:

Originally posted by markemark:
Can someone list any door cars running 6.3x or faster that have won large money ($10k or more) 1/8 mile ET Bracket Races in 2019 using radials ?

I understand the majority of door cars are on bias ply tires, and assume there is a good reason why…. like maybe not having the perfect car, or the best conditions to run on at times.

That's a good point, but if you get a bunch of cars going down a track that's not as well known for being as smooth, as say Bradenton, Orlando, SGMP like say Immokolee for a big money Super Pro bracket race. The track becomes smoother or smooth enough where it matters for a radial, first 150 - 200 ft. So with that being said I can't see it being an issue for any track with a decent turnout 100 cars plus in Super Pro. Case in point I know the orange FTI wheely wagon just hit a good lick at Immokolee on radials. He's usually going 20's I believe, maybe a little better even.

The radial tires are bad azz fast and crazy consistent. Local prep with not a boat load of cars on the track, it'll behoove you to have a car that over pitch rotates relatively speaking, wheelies. Once they spin unlike a bias, you're done. Unless you're holding a tenth or so.

To the point above: People trying these on dragsters?

I've been running radials on my 80 Camaro for 6 or 7 years & will not go back to bias slicks. Have not had the opportunity to try them on the 68 Camaro, but hopefully this year.

Anyway, majority of runs have been on Hoosier 30 x 9 radials; both lightweight & standard. I have about 125 runs on the 29.5 x 10.5 Mickey PBRs.

I see 0 difference in the consistency between the brands. The Hoosiers are lighter & quicker.
As for spinning them, its happened on both brands. It happens at temps below 55 degrees or below at night or day with no sun on the track. I have to get aggressive with the burnout to prevent it from happening. Over the 6 or 7 years, I've spun them 5 times. Purely my fault for not doing the correct burnout for the crappy conditions. As for racing in the heat, my home track is Las Vegas. We do most of our racing in daytime & it gets well over 100 degrees. Not had one issue with either brand in the heat.

This car has been raced in the Spring Fling Million, Pro 32 & 38 in 2017 & 2018. Place 2nd in Pro 38 2018. I would not take a car to that cut throat class/million if I wasn't confident with the tires or the car for that matter! Should have taken it in 2019, but I thought the 68 was an upgrade.

The car consistently wins on radials at different tracks & states. I didn't win 10K in 2019, but won over 5K in the past. This was at the bracket finals in the low roller gambler.

quote:

dawg, you think 2100 lbs is a heavier bracket car?

Curtis - It is for and Altered.... Still no answers as to why you don't see radial tires on Altered's or slower pipe racks. Anyone know why?

quote:

Originally posted by Quick Dawg:

quote:

dawg, you think 2100 lbs is a heavier bracket car?

Curtis - It is for and Altered.... Still no answers as to why you don't see radial tires on Altered's or slower pipe racks. Anyone know why?

One thing I noticed comparing gear ratio and rpm with a fella that runs a quick door car with radials.....the finish line rpm is considerably different without the growth that the bias has. I know it was mentioned, but I don't know that 300 has it covered. Of course more slipage on the converter with the heavy car too.

You won't see a radial on a dragster because a bias tire ability for traction, is its high energy losses which makes it try to form itself to the track surface when deformed. It's high energy losses makes for its higher rolling resistance for same reason, it's deformed more frequently at high or low frequency's.

The radial drag tire came about as a result of rubber technology for traction at low energy losses. So in other words it'll hook if you don't deform it or wind it up on the rim too much. The trick is to get the radial up on the tire. I do the suspension and shocks on a heads up 275 radial car for a no wheely bar class it runs in. We went one teen sixty foot in a handful of runs using a lower rear gear ratio than was thought possible and had the nitrous progressor to 100% four tenths after TB release. Which was also thought to be impossible at the time. This thing skipped the front tires 150 ft with the back of the car jacked up like a four wheel drive.

quote:

Originally posted by Mike Rietow:
You won't see a radial on a dragster because a bias tire ability for traction, is its high energy losses which makes it try to form itself to the track surface when deformed. It's high energy losses makes for its higher rolling resistance for same reason, it's deformed more frequently at high or low frequency's.

The radial drag tire came about as a result of rubber technology for traction at low energy losses. So in other words it'll hook if you don't deform it or wind it up on the rim too much. The trick is to get the radial up on the tire. I do the suspension and shocks on a heads up 275 radial car for a no wheely class it runs in. We went one teen sixty foot in a handful of runs using a lower rear ratio than was thought possible and had the progressor to 100% four tenths after TB release. Which was also thought to be impossible at the time. This thing skipped the front tires 150 ft with the back of the car jacked up like a four wheel drive.

Word is MT already has a bracket radial in testing just for dragsters

quote:

Originally posted by WHOMPWHOMP:

quote:

Originally posted by Mike Rietow:
You won't see a radial on a dragster because a bias tire ability for traction, is its high energy losses which makes it try to form itself to the track surface when deformed. It's high energy losses makes for its higher rolling resistance for same reason, it's deformed more frequently at high or low frequency's.

The radial drag tire came about as a result of rubber technology for traction at low energy losses. So in other words it'll hook if you don't deform it or wind it up on the rim too much. The trick is to get the radial up on the tire. I do the suspension and shocks on a heads up 275 radial car for a no wheely class it runs in. We went one teen sixty foot in a handful of runs using a lower rear ratio than was thought possible and had the progressor to 100% four tenths after TB release. Which was also thought to be impossible at the time. This thing skipped the front tires 150 ft with the back of the car jacked up like a four wheel drive.

Word is MT already has a bracket radial in testing just for dragsters

I believe it. What I mean is you can't stick a radial in existence today on a dragster and expect it to perform as a bias does. Which also means you won't see it. I definitely believe every slick tire manufacturer has an eye on creating tires with less rolling resistance. Which would be a low energy loss tire.