question for those running moog 7268 - Chevy Impala SS Forum
 
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post #1 of 9 (permalink) Old 02-28-2016, 09:00 AM Thread Starter
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question for those running moog 7268

Hello everybody... i hope you guys can offer some help...

i was planning on running moog 7268 up front in my wagon, i bought the car with brand new cooper trendsetter white walls 225/75/r15 on it. those are rated for 1875 lbs each, not sure how many plies.

It seems a shame to pitch the tires... but i am worried they are just going to be too soft for those springs, and the car is just going to use them for dampening if you know what i mean, and just bobble on the high sidewalls and make everyone sick... i have Koni reds with adjustable rebound to go in it...

I was going to use stock springs in the back first and see, then go up to something like like the v92 200(around that) lb springs. i prefer soft springs in the back for traction, and trade some body roll for it. i'll find a bigger bar at some point.

Anyone running those springs with tall tires rated around the same capacity? perhaps i should just go with the 80090 to make it reasonable for the now, and nip them to make them stiffer (lower) later.
thankyou!

Last edited by MrSmokey; 02-28-2016 at 12:15 PM.
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post #2 of 9 (permalink) Old 02-28-2016, 12:39 PM
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Tire height and the 7268

I installed the 7268 with the stock 255/50 17(sedan). Loved them. Had to go with budget tires 235/55 17 and I noticed a handling difference. I think is is the stiffness of the sidewall that is the problem. I think we will both be looking for SUV tires with stiff sidewalls if we want full benefit from the 7268. It is hard to get information on sidewall stiffness these days but as you say tires are a big part of suspension tuning.

Also had the same problem with my Crown Vic. Went from 225/70 15 SUV tires to stock 215/70 15 car tires. I noticed many differences and I will pay more and demand the stiffer tires from now on.

You should research the cooper trendsetter and see if it is what you want to build your car around. Or you could put them up for sale and get different tires when you get the price you want out of them. The older they are the less they are worth no matter how little wear they have.

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post #3 of 9 (permalink) Old 02-28-2016, 03:02 PM Thread Starter
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thankyou

the lb rating on the coopers trendsetter is very close to tires like the bfg radial t/a
but i cannot find anything on sidewalls... ill max their psi out and see how much jiggle they have then, right now they are pretty bad.

i can live with a handling compromise, i understand the spring wont make up for the tires, but i just wondered if others had soft tall sidewalls with those springs and could "live" with them.

i will get something better on there at some point, but i might as well use these if i can. the car is a white caprice wagon, wood sides, i would like 17" triple chrome soft 8's... but those cost money.

I had a modified volvo 240 wagon a while back with springs that were about twice stock rate (around 500 up front, 250 out back iirc, car was around 2600lbs empty), i put some stock wheels and tires on it while i was putting new tires on the proper wheels, and it was HORRIBLE, the tires did most of the dampening and the thing jiggled on top of them with no real suspension travel, felt like i was going to peal the bead going around a corner, probably would have if the volvo wheels did not have the crazy safety bead.
if i took the wife and kids in it, it would been filled with vomit.

i just want to make sure the tire can handle the springs, it should... but..

some other things to note.

seems the trucks and vans meant to run that moog spring take tires in the 2200lb weight range... granted the van weighed quite a bit more, and it is also a van.

then again, the 80090 spring is spec'd for a late crown vic and those run a recommended 1600ish lb tire....
i bet it would be OK... i just would love some actually experience.


thanks again!
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post #4 of 9 (permalink) Old 02-28-2016, 03:06 PM Thread Starter
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Quote:
Originally Posted by Z09B4U View Post
I installed the 7268 with the stock 255/50 17(sedan). Loved them. Had to go with budget tires 235/55 17 and I noticed a handling difference. I think is is the stiffness of the sidewall that is the problem. I think we will both be looking for SUV tires with stiff sidewalls if we want full benefit from the 7268. It is hard to get information on sidewall stiffness these days but as you say tires are a big part of suspension tuning.

Also had the same problem with my Crown Vic. Went from 225/70 15 SUV tires to stock 215/70 15 car tires. I noticed many differences and I will pay more and demand the stiffer tires from now on.

You should research the cooper trendsetter and see if it is what you want to build your car around. Or you could put them up for sale and get different tires when you get the price you want out of them. The older they are the less they are worth no matter how little wear they have.
thankyou!
i know enough to know i do not care to build around those tires, i just wonder if they will work well enough with my final goals for suspension parts, if i have to make a small compromise like take the 710 lb springs over the 748, that is fine if i can get a couple years out of the tires...
i would like soft 8s in the future so i can run a modern tire...
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post #5 of 9 (permalink) Old 02-28-2016, 04:26 PM
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Springs very close.

7268 and the 80090 seem very close. Driving alone or with a passenger would change the results.

Cutting is not allowed in my area and the police and insurance are taking cars apart after accidents. They are looking for any reason to shift blame.

I like the stock height because some of the local roads are only fit for 4X4. I removed the Hotchkiss lowering springs because I was scraping on everything.

I went to:
Moog 7268 Front Ford 150 97-03 Dodge Van 79-80 750Lbs
Moog 5419 Rear Caprice 79-96 173Lbs

I think you will need different springs for the wagon due to the different mounts and axle.

I kept the Hotchkiss bars front and back.

You might want to look at the Crown Victoria rear bar for the wagon.

Check this thread for information on the spring modification.

https://www.impalassforum.com/vBullet...d.php?t=263287

The first post is what made me try the heavy springs.

This is all personal taste in ride suspension.

Quote:
I will max their psi out and see how much jiggle they have then, right now they are pretty bad.
I am pretty sure that the springs will not change the cornering feel of soft tires. I do think the stiff spring/soft tire combination will grate on you if you like a stiff system.

Best way I can describe the feeling is this: With the better stiffer sidewalls I could go over speed bumps at 30 mph and there would be a bump sound and the car transferred the forward impact but stayed level. With the softer tires I feel the forward impact less but the car "hops" a bit at the rear.

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post #6 of 9 (permalink) Old 02-28-2016, 06:53 PM Thread Starter
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alrighty, thanks again, you convinced me, i'll go for it.
i will try to match the rear spring more to the v92s at around 200 rate

seems based on sedan vs wagon it may sit higher in the front than it would if i put them on a sedan. thats ok. i will start with the front, and go from there.
i am pretty darn sure the springs are interchangeable... wagon to sedan, even though the wagon has a wider axle, but i may be wrong... i will dig deeper...

i will check out the crown vic rear bar, i really would like to leave the rear soft and stock height to get a little squat, but win less body roll. front should be fine with the wagon bar. i dont have the money for new lcas and fancy rear bars, but i could grab a stock bar!

have a good night!
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post #7 of 9 (permalink) Old 03-22-2016, 11:43 AM Thread Starter
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i should do a short follow up on this.

Those springs with 4 koni sports at around 75+ comp are awesome, i would recommend them for anyone, even someone wanting a soft ride. Not just someone wanting sport handling. The comments on folks comparing them to BMWs and Volvo handling and ride are in line.
The car is more predictable and controlled, but not harsh. It just feels "good" like one would expect, instead of sloppy. Safer, and easier to read for sure.

It pushed a bit with the tires at full 35 psi, and dropping the front to 30 helped make it more ballanced. I would rather a car be loose than push, but i think with the right tires and the p71 sway it would be very neutral, or slightly loose. I would not plan on running any more bar than stock up front, and i honestly think the rear springs are fine, especially with an open diff in bad weather or loose road surface.
those cooper trend setter suck, but are tolerable for now, as they do have tread... i will probably run some nitto 555, or INVOs in 255/50r17 on silver soft 8s. car would be a lot safer that way.

Last edited by MrSmokey; 03-22-2016 at 11:46 AM.
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post #8 of 9 (permalink) Old 03-22-2016, 09:22 PM
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I have loved Cooper tires for years. Sadly the last two vehicles I ran a Cooper Zeon 225/45/17 on a 14 honda civic, tires were loud, sucked in weather and did not wear well. Then on my 14 GMC Z71 I ran the Cooper H/T 275/55/20 that I put on my truck when it had 5k miles, cause I hated the Factory Goodyear Wrangler SRA Tires. Those cooper tires were so bad the Tire Shop could not even keep them in Balance. I run Mastercraft Avenger G/T white letter 15s on my 61 Impala and they are great, but on the 96 BBB and Z71 I only run Nittos from now on. Just been my experience

1996 BBB, K&N Intake, FB/HP Delete, AIR Delete,Billet Resonator Insert, TB Bypass, TPIS Air Foil, F Body EGR, Moroso 8mm Wires, NGK Iridium Plugs, HT 160 Thermostat, Magnaflow Hi Flow Stainless Cats, Pypes 2.5" X-Pipe, Dynomax VT Mufflers, Dynomax 2.5" Tail Pipes, KYB Shocks. BMR 1 1/4" Front Sway Bar, Rear GM Upgraded Lower Control Arms, Nitto 450s, PCM4Less 93 tune, Oil Cooler Delete.
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post #9 of 9 (permalink) Old 03-23-2016, 07:28 PM Thread Starter
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to be clear on the coopers trendsetters, they are not that horrible for what they are, just horrible otherwise. They are the budget comfort whitewalls as billed... that sort of thing from anyone is not going to be anywhere ideal in an abrupt emergency situation on a car this heavy.

as it turns out, i had to do a somewhat high speed emergency run to the hospital today, and the coopers were predictable in their faults which is worth something. when i looked up the tires, they are around 60-70 bucks... (i did not buy them)

my only experience with nitto tires was a set my dad had on his car when i was in highschool, and started driving it. they were great.

Nitto is one of the few offering performance tires in 255/55r17 with a weight rating for our cars... i will use those, or 245/45 17 in a michelin or good year...

i saw this regarding invos... http://www.6speedonline.com/forums/9...helin-ps2.html

tires really are everything, with my beater, a stock thrashed 91 5 speed volvo 240 wagon with 250k that i got for free, everything on it is tired.... but the difference between a budget tire and winter tires, and the goodyear eagle gt i got on close out are night and day.... they will make a tired sloppy POS handle...
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