Modified reman

[iagsxr]

Did this a couple months ago. Don't really like working on race cars anymore, but my plumber races and I owed him for a rental remodel.

03(?) Kraftcar Was built to be 4-bar LR, swing arm RR. He wanted it switched to an simple little 2-link deal we do.

Pissed me off he put the left side body on so I could only fork it from the right.

Safety first kids

Originally the RR spring was on top of the axle tube. It'll be in front when I'm done.

First thing was to lop out lower frame rail and move it inboard.

The lower control arm mount had to go.

Make new mount on the bench. Just tacked to short tube to hold it in vise.

Holes in mount are drilled in radius so that moving arm up and down doesn't change wheelbase

Vent the tube or you'll get stalactites welding it off.

Done

Man, my worklight makes these welds look like ****. They're really not so bad, really.

Second verse same as the first(only on the other side)

The tail on this thing has been mashed at some point. Esp on the LR when I started trying to clean up the old mounts the patch and goober hidden under the paint was extensive.

How we did this was a bit of a cluster:

Being an underslung car I could measure up from the lower rail, but I'd rather had it in my scale area and set ride heights and whatnot from the ground.

I didn't do the upper spring and shock mounts. The owner thought he could handle that and of course mucked them all up.

 

[blue dog]

when moving the link arm up or down does that mean that you have to change the spring out to a different spring rate for each adjustment hole. And my second question, is that chassis made from 4130 or dom?

 

[iagsxr]

when moving the link arm up or down does that mean that you have to change the spring out to a different spring rate for each adjustment hole. And my second question, is that chassis made from 4130 or dom?

No, the spring doesn't know what hole the arm's in. The more angle in the arm the more the rearend tries to drive under it. The more angle the quicker/harder it plants the tire on the gas, but doesn't last as long.

The control arms are different lengths so the car rear steers as it rolls(leans) over in the corner, but changing angles effects that too.

Most chassis builders offer cars either way, moly or DOM. I guess with you what this one is. It has some ERW in the tail where it's been repaired.

I am not aware of any oval track chassis builders that TIGs their moly cars if that's where you're going. Too time intensive for something that's a normal wear part. They hold up fine.

 

[sams ron]

Hello,

Modified push-ups are great for toning, but it probably will not be able to add as much muscle into your frame as a regular push up will. If I have to estimate 2 and a half modified push up is equal to 1 regular push up.

 

[blue dog]

There seems to be a shock mounted in the slightly off horizontal position in a few of your pics, is this to prevent axle rap? I am curious what kind of spring rate a car like this uses in the rear and in the front? curious if you use a different rate at each corner due to the car all ways turning in the left position.
Does the car run a sway bar in the rear?
Sorry for my ignorance, and questions, i only have off road race truck chassis and suspension experience. , just for shi$'s and giggles, how much travel does the rear axle have from full bump to full droop on a car like this. Last questions, what kind of hp does a car like this have and is this car running a 9" gear in the rear end or something bigger? Sorry for all the questions, just like to check out other kinds of builds that i have no clue about.

 

[iagsxr]

9" Ford rear w/floating axles. Ratio depends on track size and engine combination. He's running a 5:83. The range at our local quarter mile track is 6:00 - 5:43.

Springs 750 LF, 850 RF, 250 LR, 225 RR. These'll vary depending on track conditions.

Rearend is located by a panhard bar, but no swaybar in the sense of resisting chassis roll. Chassis roll is how you create weight transfer thus traction. The tires we run are little and brick hard.

He's low-buck. His 355 probably makes 450 hp. A good weekly motor is more in the 500-550 range with these tires. The cars have a 2450lb minimum after race w/driver, so traction is normally more the issue than hp. This car came from a track w/different tire rules. With chain-link Hooosiers like what's on the RR 700hp is more normal.

Axle wrap is controlled by a spring-loded pull rod mounted on top of the rearend, barely visible in one of the first pics. The pinion'll move 7-12* here again creating weight transfer.

I haven't seen his scale sheets. Guessing no less that 56% rear, LR 150-200lbs heavier than RR. These numbers are all over the place depending on driver and suspension configuration.

 

[blue dog]

Thank you for the answers, you filled in all the gaps. good luck and cheers.