Soundproofing, or,"help convince me to keep these tires

dieselenthusiast · **Posted:** Fri Oct 03, 2008 5:46 pm

Cooper Discoverer STT

BFG KM2

Cooper Discoverer STT

LONG MILEAGE
Large shoulder lugs and larger centre tread blocks reduce squirming so they don't chew out so quickly.

EXTRA STRENGTH TO REDUCE OFF ROAD DAMAGE
Cooper has a multi-layered steel cord belt and an extra rubber layer fitted between the belts to absorb more impact and reduce damage. Straight Sidewall design also deflects objects and reduces damage.

INCREDIBLE OFF ROAD GRIP
Alternatively scalloped shoulder lugs so that one section always has a clear shot at fresh ground for maximum traction.

*****QUIET ON THE ROAD*****

Centre tread blocks are larger than normal and have a 52-degree angle to reduce the noise level on bitumen.

SELF CLEANING
Tapered tread blocks and a unique 52-degree angle throw the mud out with every revolution.

Guest · **Posted:** Fri Oct 03, 2008 6:19 pm

DE, those are the OLD Cooper STT's. the new ones look like this:

Those, or Maxxis Buckshots/Bighorns are what are going on my KJ next.

And if tires are too noisy for you, then A: man up and turn up the radio, like Jason said, or B: get a less-aggressive tire and sit on the porch with the little dogs :lol:

Just out of curiosity...did you get your KJ aligned after lifting it? The front tires will be toed in like crazy if not, and be fighting each other going down the road, and that will kill your fuel ecoomy. my KJ doesn't use any more gas now with a lift and 245/75-16s than it did with 235/70-16s. get your speedo recalibrated, and it will read properly, and I guarantee that you will find at least 2 mpg you were missing.

qbracken · **Posted:** Fri Oct 03, 2008 6:37 pm

ThunderbirdJunkie wrote:

DE, those are the OLD Cooper STT's. the new ones look like this:

Those, or Maxxis Buckshots/Bighorns are what are going on my KJ next.

And if tires are too noisy for you, then A: man up and turn up the radio, like Jason said, or B: get a less-aggressive tire and sit on the porch with the little dogs :lol:

Just out of curiosity...did you get your KJ aligned after lifting it? The front tires will be toed in like crazy if not, and be fighting each other going down the road, and that will kill your fuel ecoomy. my KJ doesn't use any more gas now with a lift and 245/75-16s than it did with 235/70-16s. get your speedo recalibrated, and it will read properly, and I guarantee that you will find at least 2 mpg you were missing.

Oh yeah, went straight from the shop to the dealership for an alignment...... Probably get another alignment in another 1000 miles..... I decided to stop being such a little biiaatch and just keep the tires, cuz the offroading potential is awesome....
I am gonna eventually Dynamat the the entire cabin floor and fire-wall though (after my wallet stops smoking!).... Gonna add more weight, but oh well. from the research i have done it will help with the noise......
Gonna probably take the advice given here and re-gear eventually too.... Hopefully get some MPG's back.....

jason thompson · **Posted:** Fri Oct 03, 2008 7:23 pm

I keep seeing talk of regearing to gain back mpg's
do the math
a regear will cost you in the $1000 range
how much gas ,over stock, are you burning to make that up

here is how it works out on our KJ ,based on city mpg only because it saw the biggest drop
with stock hight tires 16 with 245/75 MTR's 14 a loss of 2 mpgs ,this is using how much fuel goes in the tank on a city only week VS miles driven adjusted for the ~7% error that I found using 2 GPS units
so 2 mpg loss comes out to right at a 2 gallon per tank loss
2 gallons of fuel cost me only $7 at todays price
now in the city I would get close to 250 miles per tank on a regear but now I get about 225
I would have to drive 30K+ all city to make up the cost of the regear
our KJ has 60K on it now it will have to hit 90K with a regear this year just to pay for it
but we all know it will not be just a regear ,lockers/LSD ect will put you in the $2K range easily
also like it or not fuel will go up along with the cost of the regear making it a no win
if you KJ has 10 or 20K on it sure it will pay in the very long run but not for a high milage KJ
it will never pay or it self
you will also probably drive faster due to the better pick up and thus negate the fuel savings all together

shaggy591a · **Posted:** Fri Oct 03, 2008 7:51 pm

if you want i have a set of 235/70 16s with the stock rims from my 03 lib at my friends house in renton, wa they have like 1000 miles on them

dieselenthusiast · **Posted:** Fri Oct 03, 2008 8:11 pm

ThunderbirdJunkie wrote:

DE, those are the OLD Cooper STT's. the new ones look like this:

Dang, I knew something didn’t look right. A guy right down the road has them on his truck, and they look much better up front and personal then they do in the picture. Thanks for the correction, because the new STT’s look much better.

MNKK · **Posted:** Fri Oct 03, 2008 8:29 pm

If you are going to do the dyna mat, you will want to do it yourself. It really isn't hard...per say... but if you pay to have it done, it will kill you on cost. I helped a buddy do it to some of his caddy. It was amazing how much it helped. (In a caddy, that is saying alot.) But shop around before buying that stuff. alot of places mark it up a grip.

I asked about those Coopers a while ago, in another thread. I really like how thick the side wall was on them. But tires are a little out of my price range right now. Hopefully some time in the next couple of months.

tjkj2002 · **Posted:** Fri Oct 03, 2008 11:12 pm

jason thompson wrote:

I keep seeing talk of regearing to gain back mpg's
do the math
a regear will cost you in the $1000 range
how much gas ,over stock, are you burning to make that up

here is how it works out on our KJ ,based on city mpg only because it saw the biggest drop
with stock hight tires 16 with 245/75 MTR's 14 a loss of 2 mpgs ,this is using how much fuel goes in the tank on a city only week VS miles driven adjusted for the ~7% error that I found using 2 GPS units
so 2 mpg loss comes out to right at a 2 gallon per tank loss
2 gallons of fuel cost me only $7 at todays price
now in the city I would get close to 250 miles per tank on a regear but now I get about 225
I would have to drive 30K+ all city to make up the cost of the regear
our KJ has 60K on it now it will have to hit 90K with a regear this year just to pay for it
but we all know it will not be just a regear ,lockers/LSD ect will put you in the $2K range easily
also like it or not fuel will go up along with the cost of the regear making it a no win
if you KJ has 10 or 20K on it sure it will pay in the very long run but not for a high milage KJ
it will never pay or it self
you will also probably drive faster due to the better pick up and thus negate the fuel savings all together

I made up the cost of the 4.10 swap in less then a year,I went from 8/14mpgs(city/highway) to 11+/20 after the gear swap.And at the time I did a few 3000 mile round trips back home so it added up real fast and paid for itself in no time,not to mention all the money it has potentially saved me in prolonging the life of my drivetrain from relieving alot of un-needed stress on the transmission.

jason thompson · **Posted:** Sat Oct 04, 2008 12:34 am

tjkj2002 wrote:

jason thompson wrote:

I keep seeing talk of regearing to gain back mpg's
do the math
a regear will cost you in the $1000 range
how much gas ,over stock, are you burning to make that up

here is how it works out on our KJ ,based on city mpg only because it saw the biggest drop
with stock hight tires 16 with 245/75 MTR's 14 a loss of 2 mpgs ,this is using how much fuel goes in the tank on a city only week VS miles driven adjusted for the ~7% error that I found using 2 GPS units
so 2 mpg loss comes out to right at a 2 gallon per tank loss
2 gallons of fuel cost me only $7 at todays price
now in the city I would get close to 250 miles per tank on a regear but now I get about 225
I would have to drive 30K+ all city to make up the cost of the regear
our KJ has 60K on it now it will have to hit 90K with a regear this year just to pay for it
but we all know it will not be just a regear ,lockers/LSD ect will put you in the $2K range easily
also like it or not fuel will go up along with the cost of the regear making it a no win
if you KJ has 10 or 20K on it sure it will pay in the very long run but not for a high milage KJ
it will never pay or it self
you will also probably drive faster due to the better pick up and thus negate the fuel savings all together

I made up the cost of the 4.10 swap in less then a year,I went from 8/14mpgs(city/highway) to 11+/20 after the gear swap.And at the time I did a few 3000 mile round trips back home so it added up real fast and paid for itself in no time,not to mention all the money it has potentially saved me in prolonging the life of my drivetrain from relieving alot of un-needed stress on the transmission.

never mind
I decided to avoid this

riptricket · **Posted:** Sat Oct 04, 2008 12:38 am

the stt's do not have a 235/70/16. i was thinking of going with the st's!! but i don't know, the bfg at's worked out pretty dang well!

dieselenthusiast · **Posted:** Sat Oct 04, 2008 10:34 am

riptricket wrote:

the stt's do not have a 235/70/16. i was thinking of going with the st's!! but i don't know, the bfg at's worked out pretty dang well!

I was hoping to run the BFG T/A KO's 245/75/R17 on my stock rims.. Unfortunately they are 31.6" tall and I'm not sure how well my KJ can tow with that size of tire, even with the addition of 4:10's. It seems that I can find more sizes of off-road tires for my stock 17X7” rims than I can find sizes for the A/T tires. I’d rather keep my Moabs for off-road tires and the stock rims for my all-terrain highway tires. Any thoughts out there?

Guest · **Posted:** Sat Oct 04, 2008 9:44 pm

riptricket wrote:

the stt's do not have a 235/70/16. i was thinking of going with the st's!! but i don't know, the bfg at's worked out pretty dang well!

The STs suck anyway. Wet traction is about the same between those and my MT/R's.

225/75-16 would be the way to go for an MT for a stock KJ

2006 KJ · **Posted:** Sat Oct 04, 2008 11:36 pm

if you are still thinking of dynamatting i have 3 rolls (new and still in box) of dynamat extreme that i will be glad to get out of my closet for a reasonable price... let me know if your interested

Dave08 · **Joined:** Fri Nov 02, 2007 4:17 pm **Posts:** 250

How much does the dyno mat cost anyway?

My KJ has 30.8" 's on it and they're fine for power. I tend to run OD off in town or in traffic which changes speed a lot. After doing the math it's gotten 22 pretty reg. on longer highway runs, even in Iowa hills.

qbracken · **Posted:** Sun Oct 05, 2008 2:20 pm

Dave08 wrote:

I tend to run OD off in town or in traffic which changes speed a lot. .

does that help with MPG's??

Dave08 · **Joined:** Fri Nov 02, 2007 4:17 pm **Posts:** 250

MAYBE.. But it makes it 100 % more driveable with the tires.

ObiHann · **Posted:** Tue Oct 07, 2008 7:00 am

I think these will be my next tires. My KJ is basically not off road worthy right now, and won't be for some time. But my hope is to lift and add these guys in the spring.

Soundproofing, or,"help convince me to keep these tires

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