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Re: Help setting up Hemi Duster [Re: TC@HP2] #2112765
07/18/16 09:04 PM
07/18/16 09:04 PM
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The Pale Blue Dot
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Originally Posted By TC@HP2
Originally Posted By chrisnben
This will also give us the spring rate we need (which apparently is 400-500# with the big engine).


I don't know what their motion ratios are, but this should put you around 250-300# wheel rates. This is equivalent to 1.06-1.12 A body t-bars.
Firm Feel shows the 1.12" A- body bars as a 300#" wheel rate, That is what they recommended for my car. '68 Barracuda 400 B engine, aluminum heads, water pump+Housing, Manual steering and brakes, glass hood, battery in trunk. HTH, Steve
twocents

Re: Help setting up Hemi Duster [Re: chrisnben] #2113937
07/20/16 12:01 PM
07/20/16 12:01 PM
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Madison, Wisconsin
chrisnben Offline OP
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I'll get some info from QA1 and others regarding the coil spring rates needed. #500 seems really stiff. Denny says the spring should compress 1/4 down with the load on it. My guess would be #400 ones. Stay tuned.

PS- I'm listing the new parts in the A-body FS section. I won't be needing- (2) front Bilsteins and the .940 Firm Feel T-bars. All brand new. PM me if interested.


'70 Cuda "Badfish 2"- in the works

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Re: Help setting up Hemi Duster [Re: chrisnben] #2113950
07/20/16 12:13 PM
07/20/16 12:13 PM
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IMO, with an elephant sitting on the nose of your car, 500# sounds light for a car that you actually want to drive without worry on the street. If this is predominately a street/strip car, than yes, they may seem a bit heavy, although they will improve your consistentcy.

.94 t-bars with a hemi @ 155# rate would be, IMO, too light. To duplicate that in a coil over may be 250-300# spring, again depending on motion ratio of the lower control arm.

But it is your car and you know your driving preferences better than us.


Re: Help setting up Hemi Duster [Re: TC@HP2] #2114478
07/21/16 12:28 AM
07/21/16 12:28 AM
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Madison, Wisconsin
chrisnben Offline OP
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Originally Posted By TC@HP2
IMO, with an elephant sitting on the nose of your car, 500# sounds light for a car that you actually want to drive without worry on the street. If this is predominately a street/strip car, than yes, they may seem a bit heavy, although they will improve your consistentcy.

.94 t-bars with a hemi @ 155# rate would be, IMO, too light. To duplicate that in a coil over may be 250-300# spring, again depending on motion ratio of the lower control arm.

But it is your car and you know your driving preferences better than us.



I'm new to the coilover deal, so taking it all in- thanks. I would prefer to get some decent handling beer (if I can use that term with the hemi in there/ not ideal). The 245/45/17 fronts showed up today along with the 285/40/18 rears. They look promising drive . The 528 engine has aluminum heads, w/p, intake, etc. along with the fiberglass hood & front bumper, aluminum brackets, Viper calipers and chromoly UCA's & LCA's. I would think it could compare to an iron 340 and stock front components IMO. The 500# springs sound about right. boogie


'70 Cuda "Badfish 2"- in the works

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Re: Help setting up Hemi Duster [Re: chrisnben] #2114611
07/21/16 10:25 AM
07/21/16 10:25 AM
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"The 528 engine has aluminum heads, w/p, intake, etc. along with the fiberglass hood & front bumper, aluminum brackets, Viper calipers and chromoly UCA's & LCA's. I would think it could compare to an iron 340 and stock front components IMO

--------------------------



I don't know about that.

The aftermarket blocks have been running quite a bit heavier than the originals. Even with the aluminum pieces you mentioned, it is tough to get a Hemi down to the weight of a big block, let alone a small block. Everything about these elephants is big and HEAVY.

When you get it together and have a chance to weigh it, let us know.


Master, again and still
Re: Help setting up Hemi Duster [Re: chrisnben] #2114904
07/21/16 04:20 PM
07/21/16 04:20 PM
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Originally Posted By chrisnben

I'm new to the coilover deal, so taking it all in- thanks. I would prefer to get some decent handling beer (if I can use that term with the hemi in there/ not ideal).


No prob, that's why we are here.

A t-bar mounts at the pivot point, so it is 1:1 spring rate to wheel rate. A coil over mounts somewhere else out on the control arm, so its spring rate is reduce by the motion ratio difference between the overall length and the spring mounting length. EG: On a stock 2nd gen Camaro, this ratio is almost 50%, so a 500# spring rate produces 250# wheel rate. An aftermarket coil over will most likely mount the coil somewhere else on the control arm which will either reduce or retain a % of spring rate.

Wheel rates are what you need to compare apples to apples with the force applied at the wheels compared to another car. Eliminates all the variables in spring size and geometry.

Re: Help setting up Hemi Duster [Re: DaveRS23] #2114905
07/21/16 04:20 PM
07/21/16 04:20 PM
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Who is the French Dr guy who is a member here, that runs a rare Hemi Road race E body for fun on European tracks. That might give some insight into the level required to get a hemi car to handle and work towards. He posted threads here about the car on track.


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Help setting up Hemi Duster [Re: chrisnben] #2115124
07/21/16 09:47 PM
07/21/16 09:47 PM
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With 245s on the front the suspension isn't going to be so critical. It won't grip much anyway.


Mopar to the bone!!!
Re: Help setting up Hemi Duster [Re: 72Swinger] #2115513
07/22/16 02:26 PM
07/22/16 02:26 PM
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The Pale Blue Dot
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Originally Posted By 72Swinger
With 245s on the front the suspension isn't going to be so critical. It won't grip much anyway.
It will push at the limit with small tires, but no harm in maximizing the suspension. Tire/wheel combos are easy, if not cheap, to replace.

Re: Help setting up Hemi Duster [Re: chrisnben] #2116411
07/24/16 12:01 AM
07/24/16 12:01 AM
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Madison, Wisconsin
chrisnben Offline OP
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thanks for the inputs guys. I have a week here to focus on the drag car before vacation. I will chime in when we return. Cheers


'70 Cuda "Badfish 2"- in the works

Home of MoPar University- We school 'em one at a time!!
Re: Help setting up Hemi Duster [Re: chrisnben] #2138448
08/22/16 11:35 AM
08/22/16 11:35 AM
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chrisnben Offline OP
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The big brown truck showed up with all kinds of goodies (good thing I have the 3-season porch to stockpile all the stuff!).

Getting closer to installing the suspension parts- just waiting on the modded K-frame to get back so we can install the Hemi and trans.

For now, I'm installing the "Tanks" EFI gas tank, pump, lines, etc. Got the torque boxes and frame ties being welded in this week too. The Hemi now has the aluminum pulleys and the A/C compressor mounted along with the new Saginaw P/S pump.

One question- Opinions on keeping the rear 10 x 2" drums with the 11.75 Viper kit fronts? I do have some 10" SSBC rear discs here.


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Re: Help setting up Hemi Duster [Re: chrisnben] #2138708
08/22/16 04:51 PM
08/22/16 04:51 PM
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Nebraska
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Do the discs if you have them.


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Re: Help setting up Hemi Duster [Re: 72Swinger] #2139192
08/23/16 09:59 AM
08/23/16 09:59 AM
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Madison, Wisconsin
chrisnben Offline OP
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I just wish the SSBC discs were lighter. Maybe I'll start off with the drums and get some lighter 11" Wilwoods later. I have to keep this thing on a diet. up


'70 Cuda "Badfish 2"- in the works

Home of MoPar University- We school 'em one at a time!!
Re: Help setting up Hemi Duster [Re: chrisnben] #2140074
08/24/16 06:19 PM
08/24/16 06:19 PM
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Gerst makes a similar coil over kit for stock k member and steering, just an FYI since you already have his uppers.

Re: Help setting up Hemi Duster [Re: chrisnben] #2165705
10/01/16 10:41 AM
10/01/16 10:41 AM
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Madison, Wisconsin
chrisnben Offline OP
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I'm about to dig in on the Duster now. The modified K for the Hemi is back (sweet work Al). I have the Hemi Denny coil-over swap to use with the factory K. Engine/trans should be installed in the next couple weeks.

Looking at the rear set-up- I'm either going to have to do the offset spring kit from Cass; or go with a different style to gain some tire clearance (285/40/18). Needing 3/4" on the inside. Spoke with Carl Gerst on his 4-link system $1695 (and reading some posts here on the rear 4-link set-up). BTW- I'm installing a 68 Charger gas tank in the Duster to gain room for 3" tailpipes. The Charger tank is longer- sits about 5" from the differential back to the bumper X-frame. This would limit me to the forward-mounted 4-link style vs. Watts set-up.

OR a guy could just go with some lighter leaf springs, move them in and be done with it. Again- this will be a street car mainly. I think this might be a smarter choice. I'd like to save the $$ for some lighter 3 piece wheels.


'70 Cuda "Badfish 2"- in the works

Home of MoPar University- We school 'em one at a time!!
Re: Help setting up Hemi Duster [Re: chrisnben] #2240319
01/24/17 11:37 AM
01/24/17 11:37 AM
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Madison, Wisconsin
chrisnben Offline OP
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Well, plans have changed (hopefully for the better). We've decided to switch bodies for the 528 Hemi- so now we are using my '70 Cuda.

The Viper brake kit, coil-over susp., sway bars- all going on it as well. The rear set-up will be simply using a 68 B-body axle housing and offset shackles to gain the tire clearance for the 285's out back.

I'll be starting a new thread shortly in the engine tech section for the '72 Duster. We are building a Slant 6 with a TorqStorm supercharger. It will be alot less weight on the nose.

She'll get the 11.75 rotors, sway bars, etc. Same body panel, bumpers swap to fiberglass parts for weight reduction and some light wheels. Should be a fun build once again!!


'70 Cuda "Badfish 2"- in the works

Home of MoPar University- We school 'em one at a time!!
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