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Recommenfations on torsion bars and shocks please

Posted By: Dodgeballs

Recommenfations on torsion bars and shocks please - 11/04/13 04:14 AM

I don't want to spend a bunch of money now, so I would like to build around what I have now.

1969 Dart
340 4 spd. 3.91
Oval track leafs
245/60/14 back
215/70/14 front

I was thinking of addco sway bars because of price.
1 1/8" fronts
3/4 or 7/8" rear?

What size torsion bars should I use? A decent cheaper shock (but if bilsteins are a lot better for a couple hundred more, I guess I can go that way)?

I just rebuilt the front end. What camber/caster/toe settings? The car is not a daily driver. It doesn't go far - I'm in Hawaii. I don't mind a little more aggressive camber setting, I think.

Thanks for any suggestions.
Posted By: jcc

Re: Recommenfations on torsion bars and shocks please - 11/04/13 07:49 PM

So in on the island you must always be turning?

90% of what you are seeking has been covered in other threads here, they are worth reviewing, my only initial comment I'd make, and there are differing opinions on this solution, is only consider the rear bar after everything else is sorted out, and then decide.
Posted By: Mopar Mitch

Re: Recommenfations on torsion bars and shocks please - 11/04/13 07:55 PM

Regarding TBs... for your a-body.. don't be afriad of stiffer rated bars.. i know a few guys running the 1.14s on the street for A-bodies.. not bad at all and they wouldn't hesitate to install 1.18 if they really wanted to... and you would not regret it.. in fact, it'll end up being a new base for the best suspension mod you'll make.. and remember to keep it an overall "package" (TBs, leafs, shocks, sway bars, bushings... your tires are pretty small, especially in the front.. consider other sizes as well as rims.
Posted By: 72Swinger

Re: Recommenfations on torsion bars and shocks please - 11/04/13 07:59 PM

Quote:

So in on the island you must always be turning?

90% of what you are seeking has been covered in other threads here, they are worth reviewing, my only initial comment I'd make, and there are differing opinions on this solution, is only consider the rear bar after everything else is sorted out, and then decide.


As much as I hate too, I agree with jcc on this. I have a rear bar sitting in the corner of my garage because of this. The rear bar made the car ride rougher and a contender for a drifting trophy.
Posted By: Dodgeballs

Re: Recommenfations on torsion bars and shocks please - 11/04/13 08:45 PM

Quote:

So in on the island you must always be turning?

90% of what you are seeking has been covered in other threads here, they are worth reviewing, my only initial comment I'd make, and there are differing opinions on this solution, is only consider the rear bar after everything else is sorted out, and then decide.




Yeah - it's like a big NASCAR track...

The reason I ask is because I have no idea about setting up a suspension for turns. And I've looked through past threads, but I don't see anything with my setup. I've read some KYB vs Bilstein stuff. I'm not afraid of a stiff setup with the torsion bars, per se. I was wondering what size torsion bars would work best with the Oval Track springs I have... I think I'd like the car to have slight oversteer.

I've had some bad oversteer cars - no fun. The best feeling car I ever had was a stock '78 firebird. You could hit a turn way too fast and it never spun - just kicked the back out a bit and waited for the tires to catch up and get some traction (a piece of junk car otherwise).

Do you guys really think no rear sway bar? Or the small one?
Posted By: Dodgeballs

Re: Recommenfations on torsion bars and shocks please - 11/04/13 08:48 PM

Quote:

Quote:

So in on the island you must always be turning?

90% of what you are seeking has been covered in other threads here, they are worth reviewing, my only initial comment I'd make, and there are differing opinions on this solution, is only consider the rear bar after everything else is sorted out, and then decide.


As much as I hate too, I agree with jcc on this. I have a rear bar sitting in the corner of my garage because of this. The rear bar made the car ride rougher and a contender for a drifting trophy.





Do you mean it made the car way too loose? I don't mind the rough ride. This thing is gonna be pounded and I don't need a Cadillac smooth ride. I don't want it to spin like a top either, though.
Posted By: Dodgeballs

Re: Recommenfations on torsion bars and shocks please - 11/04/13 08:54 PM

Quote:

Regarding TBs... for your a-body.. don't be afriad of stiffer rated bars.. i know a few guys running the 1.14s on the street for A-bodies.. not bad at all and they wouldn't hesitate to install 1.18 if they really wanted to... and you would not regret it.. in fact, it'll end up being a new base for the best suspension mod you'll make.. and remember to keep it an overall "package" (TBs, leafs, shocks, sway bars, bushings... your tires are pretty small, especially in the front.. consider other sizes as well as rims.




I will change the tires/rims eventually. But they are brand new and (long story) I had to go with what I got right now. I guess I prefer matching the TB's/leafs/shocks to themselves above anything else, since the tires will change eventually. I have poly strut bushings, rubber LCA, and moog k7103 offset uppers.

So I guess to start - what size T-bars would best match the oval track leafs?
Posted By: Supercuda

Re: Recommenfations on torsion bars and shocks please - 11/04/13 11:31 PM

Quote:



So I guess to start - what size T-bars would best match the oval track leafs?




That depends, what are your corner weights and what is the spring rate of the leafs?

For my 65 Cuda, which isn't all that applicable to you, .89" bars matched the oval track leafs I bought.
Posted By: Dodgeballs

Re: Recommenfations on torsion bars and shocks please - 11/05/13 12:09 AM

Quote:

Quote:



So I guess to start - what size T-bars would best match the oval track leafs?




That depends, what are your corner weights and what is the spring rate of the leafs?

For my 65 Cuda, which isn't all that applicable to you, .89" bars matched the oval track leafs I bought.




I really don't know my corner weights. I don't know if I have access to scales to figure that out. I figured someone with a dart would have a good idea of what to go with.

The spring rates are 120 lbs/inch.
Posted By: Supercuda

Re: Recommenfations on torsion bars and shocks please - 11/05/13 01:15 AM

Weight has a prime effect on good handling. With AC, without, battery relocated, any weights removed or relocated. It all plays into the effect. Front to rear ratios are important too.

Most of the posters here are into a lot more than just a better handler on the street, sorta semi serious about it actually.

You may want to narrow the options down for us otherwise you are gonna get a bunch of high dollar suggestions. You got a budget?
Posted By: 72Swinger

Re: Recommenfations on torsion bars and shocks please - 11/05/13 01:53 AM

https://board.moparts.org/ubbthreads/show...e=0#Post7909560
Posted By: Skeptic

Re: Recommenfations on torsion bars and shocks please - 11/05/13 02:19 AM

Quote:

https://board.moparts.org/ubbthreads/show...e=0#Post7909560


A very relavant thread. I'd recommend Andy F's Torsion Bar Tango as a place to read. As you can guess, what is best is quite different from one person to the next. My cars first upgrade was to the MP .920" bars, Addco 1" front/ 3/4" rear bars and Edelbrock IAC shocks. It made for a good riding combo that I could comfortably take freeway on/off ramps at 2X the posted limits. I'm getting more aggressive with the parts and adding a bigger engine with easily 2X the HP of the tired 318 that was in there before.
Posted By: Dodgeballs

Re: Recommenfations on torsion bars and shocks please - 11/05/13 03:45 AM

Quote:

Quote:

https://board.moparts.org/ubbthreads/show...e=0#Post7909560


A very relavant thread. I'd recommend Andy F's Torsion Bar Tango as a place to read. As you can guess, what is best is quite different from one person to the next. My cars first upgrade was to the MP .920" bars, Addco 1" front/ 3/4" rear bars and Edelbrock IAC shocks. It made for a good riding combo that I could comfortably take freeway on/off ramps at 2X the posted limits. I'm getting more aggressive with the parts and adding a bigger engine with easily 2X the HP of the tired 318 that was in there before.





I did read that thread. And that article by AndyF was very informative. Thanks.

Maybe I'll try the 1.03", KYB's, 1 1/8, 3/4 sway bars - see what happens.
Posted By: Dodgeballs

Re: Recommenfations on torsion bars and shocks please - 11/05/13 04:21 AM

Quote:

Weight has a prime effect on good handling. With AC, without, battery relocated, any weights removed or relocated. It all plays into the effect. Front to rear ratios are important too.

Most of the posters here are into a lot more than just a better handler on the street, sorta semi serious about it actually.

You may want to narrow the options down for us otherwise you are gonna get a bunch of high dollar suggestions. You got a budget?




I do have a limited budget. That's why I was wanted to figure out something budget that would work together based on what I already have. I have a Roadrunner that I will go full Hotchkiss. But for the Dart, I don't want to put a lot of money towards it right now. I will do some homemade frame connectors. I rebuilt the front. I'm pretty much looking at cheap sway bars and torsion bars to match my oval track leafs. And I guess it's KYB's or Bilsteins. I was looking for something that would handle decent and be balanced within those limitations. I will do wheels and tires - later.
Posted By: Dan@Hotchkis

Re: Recommenfations on torsion bars and shocks please - 11/05/13 07:40 PM

You should always try to match your spring rates with your shocks and sway rate tuning. We spend a lot of time tuning our suspension and our shocks work great with Firm Feel's 1.06 T-Bars. The spring should be what holds the car up and keeps the suspension from bottoming out, the shock should control that motion. I believe there are no shocks on the market as dialed in for a specific rate and ratio as ours.
Posted By: vynn3

Re: Recommenfations on torsion bars and shocks please - 11/05/13 08:33 PM

Quote:

And I guess it's KYB's or Bilsteins. I was looking for something that would handle decent and be balanced within those limitations.




After I went from KYB's to Bilstein's, and I'd never buy KYB's again. Bilstein's had better comfort AND handling/control with the 1.03" bars. Bigger torsion bars MUST have better shocks to enjoy the full benefits. I'd read this over and over, but didn't fully believe until I tried it.

vm
Posted By: Tomswheels

Re: Recommenfations on torsion bars and shocks please - 11/06/13 01:54 AM

Quote:

Maybe I'll try the 1.03", KYB's, 1 1/8, 3/4 sway bars - see what happens.




From my personal autocross experience, I would highly recommend the 1.06' with Hotchkis shocks and the biggest front bar you can find. My 69 Barracuda handled much worse with a rear bar! I guarantee the money you would waste on a rear bar is much better spent on upgrading to Hotchkis shocks...
Posted By: Supercuda

Re: Recommenfations on torsion bars and shocks please - 11/06/13 02:14 AM

Gee, wonder why a rear bar was a problem?
Posted By: ahy

Re: Recommenfations on torsion bars and shocks please - 11/07/13 02:47 AM

As several have stated, it depends on what you are after and budget. Sounds like you want a good street handler and not break the budget. T bars in the .92-.96 range are a big upgrade over stock and don't need high end shocks. Good parts store gas shocks or KYB's should do it. Agree skip the rear bar as a start.

For alignment, I like -.75 camber, +5 caster and factory toe settings. That is hard or impossible to get with factory parts. Offset upper bushings help as do tubular UCA's. With stock parts, some positive caster and negative camber will get it done. Its a trade off between the two so you just have to keep it balanced.
Posted By: Tomswheels

Re: Recommenfations on torsion bars and shocks please - 11/07/13 05:13 AM

Quote:

Gee, wonder why a rear bar was a problem?




I believe when you stop the rear from leaning, you stop what little weight is in the rear from transferring to the outside tire. The rear stepped out much earlier with the rear bar.
Posted By: jcc

Re: Recommenfations on torsion bars and shocks please - 11/07/13 06:02 AM

Quote:

Quote:

Gee, wonder why a rear bar was a problem?




I believe when you stop the rear from leaning, you stop what little weight is in the rear from transferring to the outside tire. The rear stepped out much earlier with the rear bar.




Not sure if I understand your point, but a rear bar for instance will decrease the loading on the inside tire, AND increase loading on outside tire, resulting in less total axle grip BECAUSE tires are LESS evenly loaded, and this results in increased over steer, and if not matched better to front roll resistance, handling is perceived to be degraded.
Posted By: cudazappa

Re: Recommenfations on torsion bars and shocks please - 11/07/13 02:23 PM

Quote:

Quote:

Quote:

Gee, wonder why a rear bar was a problem?




I believe when you stop the rear from leaning, you stop what little weight is in the rear from transferring to the outside tire. The rear stepped out much earlier with the rear bar.




Not sure if I understand your point, but a rear bar for instance will decrease the loading on the inside tire, AND increase loading on outside tire, resulting in less total axle grip BECAUSE tires are LESS evenly loaded, and this results in increased over steer, and if not matched better to front roll resistance, handling is perceived to be degraded.




JCC You got it backwards. You want your weight to transfer to the outside in a corner. That's where you need the grip, not the inside.
Posted By: PHJ426

Re: Recommenfations on torsion bars and shocks please - 11/07/13 02:41 PM

To get an idea of how much weight your car has maybe try hitting a truck weigh station on your "Interstate" on the island?

If you get there and it's unattended you might be able to see the display through the window. Weigh the complete car and then place just the front 2 tires on the scale and then weigh with the rear 2 tires only on the scale.

With this information you can use the 10% of front end weight that Andy uses with his torsion bar tango application article.

When you set the car up for the track there are adjustments you can make to the chassis and suspension (of which I don't know all of them) that will "move" the weight around the corners of the car. Other moves like changing battery location can be tried out as well.

But for what your looking for right now, get the amount of weight that is placed on the front tires in an at rest condition your decision can be made confidently.
Posted By: TC@HP2

Re: Recommenfations on torsion bars and shocks please - 11/08/13 03:22 PM

You can also find scales at landscaping companies, drywall suppliers, waste transfer stations, and I'd imagine, some freight companies that are boxing loads in/out of the docks.


To take a wild stab at it, I'd bet your car is around 3200# with a 56% front bias, or roughly 1800# on the nose. So a 10# figure for that would be 180# t-bar rate, or just a hair under 1". For simplicity, call it 1" and your good.

If this is a bucks down approach then pick up a solid 1.125" front sway bar, bolt it all together and see how it feels.
Posted By: jcc

Re: Recommenfations on torsion bars and shocks please - 11/08/13 06:27 PM

Quote:

Quote:

Quote:

Quote:

Gee, wonder why a rear bar was a problem?




I believe when you stop the rear from leaning, you stop what little weight is in the rear from transferring to the outside tire. The rear stepped out much earlier with the rear bar.




Not sure if I understand your point, but a rear bar for instance will decrease the loading on the inside tire, AND increase loading on outside tire, resulting in less total axle grip BECAUSE tires are LESS evenly loaded, and this results in increased over steer, and if not matched better to front roll resistance, handling is perceived to be degraded.




JCC You got it backwards. You want your weight to transfer to the outside in a corner. That's where you need the grip, not the inside.




We disagree, anybody want to jump in here, I think this is a major misunderstanding here, or one of us is completely wrong ( I don't mean that in belligerent way)

A couple of basics regarding grip as I see them, a. maximum grip is achieved on a single axle is when both tires are loaded exactly the same. In a corner that is not possible, no matter what the design or features. b. Any difference in tire loading reduces overall total grip, no matter what the weight transfer, as the higher loaded tire DOES NOT gain the grip back proportionally that the unloaded tire lost. c, sway bars reduce grip to a degree by increasing tire loading differences, but may have other offsetting positives by such things such as improved wheel/tire alignment in body roll. d. on this point I am winging it, but body roll is possibly additionally increased by removing sway bars because of increased grip, if tire alignment can still be useful. e. there is more to perceived handling then ultimate grip.

Well?
Posted By: astjp2

Re: Recommenfations on torsion bars and shocks please - 11/08/13 10:05 PM

Don't forget about preventing brake dive, larger torsion bars help prevent this. I have 1.03's on my b-body but I am thinking I need to go larger because of my heavy world block and other heavy parts that I am installing. TIm
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