Oh well.
1972 Dodge Colt
- Thread starter Hyper_pak
- Start date
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famous bob
mopar misfit
cant get on Facebook , got kicked off for an opinion (I think)...they want a pic now to get back on , cant do it on this chrome book < don't know how ...will get on trp website tho...
Facebook aka META is the absolute worse co.
famous bob
mopar misfit
hey, I got on the trp website and there was nothing about it being cancelled , and cant get on Facebook , can you confirm the cancellation ?
Curious minds want to know !!-------------LOL
Hyper_pak
Old School Chrysler Fan
famous bob
mopar misfit
don't know who lexxie is , but having trouble seeing this event cant run with (one) person being absent .
Still have not heard this anywhere else --??? will look at the website again...
famous bob
mopar misfit
Hyper_pak
Old School Chrysler Fan
Ok, so I got distracked!
But Colt is still #1 priority.
Started looking at the front suspension issues.
I made a couple of Videos to show the contact point.
Here is a video from the front.
The shock has been removed to allow travel:
Here is a view from the rear:
Looking at the rear picture I think maybe I can cut on an angle and add quite a bit of travel.
Keep in mind the current shock has only at best an inch and a half travel.
New shocks will have more and if I can get the right length, they will act like travel limiters.
So the lower steering arm won't hit the lower control arm.
But Colt is still #1 priority.
Started looking at the front suspension issues.
I made a couple of Videos to show the contact point.
Here is a video from the front.
The shock has been removed to allow travel:
Here is a view from the rear:
Looking at the rear picture I think maybe I can cut on an angle and add quite a bit of travel.
Keep in mind the current shock has only at best an inch and a half travel.
New shocks will have more and if I can get the right length, they will act like travel limiters.
So the lower steering arm won't hit the lower control arm.
weedburner
Well-Known Member
I would just make a tubular control arm, used to make tubular uppers/lowers all the time back when I was racing dirt latemodels...
Just make a jig off of your existing parts. Then make sleeves/bushings and bolt them into the jig, then connect the dots with tubing.
Here's a pic of the tubular replacements I made for my current street/strip car, compared to the stock parts they replaced...
I hit a pothole hiding in the shadows a couple summers ago on a mountain pass at highway speed. Hit hard enough that I thought my cell phone flew out the window, also broke some belts in a front tire. No damage to the above fabricated parts, they are still on the car.
Grant
Just make a jig off of your existing parts. Then make sleeves/bushings and bolt them into the jig, then connect the dots with tubing.
Here's a pic of the tubular replacements I made for my current street/strip car, compared to the stock parts they replaced...
I hit a pothole hiding in the shadows a couple summers ago on a mountain pass at highway speed. Hit hard enough that I thought my cell phone flew out the window, also broke some belts in a front tire. No damage to the above fabricated parts, they are still on the car.
Grant
Maybe I missed it somewhere but why do you want more travel?
Hyper_pak
Old School Chrysler Fan
My little slant has a hard time launching.
There is only 1/2 inch travel now in the front end.
So as best I can figure, on clutch dump I have to pick up the whole front end.
A little travel I hope will allow for a better launch.
This might be the hot ticket for someone with HP, but not for my slant.
I know Grant, get the Tamer working, I know, I know!
There is only 1/2 inch travel now in the front end.
So as best I can figure, on clutch dump I have to pick up the whole front end.
A little travel I hope will allow for a better launch.
This might be the hot ticket for someone with HP, but not for my slant.
I know Grant, get the Tamer working, I know, I know!
Hyper_pak
Old School Chrysler Fan
I took the front spindles out and took the steering arms off.
Going to the machine shop on Monday to see about my fix.
Then I need two new front shocks.
Going to the machine shop on Monday to see about my fix.
Then I need two new front shocks.
Hyper_pak
Old School Chrysler Fan
Well that won't work.
I found out the control arm ball joints limit the front travel.
New shocks and modified spindle/knuckle won't fix it.
Going to use it as is and go looking for some more horsepower.
And when the wife wins the lottery I will be installing a couple of struts.
I found out the control arm ball joints limit the front travel.
New shocks and modified spindle/knuckle won't fix it.
Going to use it as is and go looking for some more horsepower.
And when the wife wins the lottery I will be installing a couple of struts.
Hyper_pak
Old School Chrysler Fan
I took the wheelie bars off a couple years ago.
Seemed a little silly on a 8 sec 1/8 mile car.
Seemed a little silly on a 8 sec 1/8 mile car.
Stan, I forget. What gear is in the car again?
That seems like a lot of tire for your combination. Could that be the problem getting it to launch?
weedburner
Well-Known Member
I wouldn't worry too much about front end travel at this point. Clutch tune is top of the list for improving stick shift 60', especially in the Colt's case with plenty of traction. With a 'tamer controlling the hit, 60' improvements will go hand-in-hand with launch rpm.
Here's a nice round number comparison of how raising launch rpm improves engine output...
...A flat torque curve 300ftlb engine is only making 257hp at launch if you dump the clutch at 4500rpm. If the clutch then draws the engine down to 3000rpm after launch, now that 300ftlb engine is only making 172hp as it starts its climb to the shift point.
...That 300ftlb engine improves to 370hp at launch (113hp improvement) if you dump the clutch at 6500rpm. If the clutch then draws the engine down to 4500rpm, that 300ftlb engine is now making 257hp (85hp improvement) as it starts its climb to the shift point.
More launch rpm not only increases the engine's average HP production during launch, but it also increases the amount of inertia energy available to improve the 60'. Inertia energy is basically power that gets produced before the clock starts ticking, which gets stored as rpm in the engine's rotating assy. That energy can then be drawn out after the clocks start running to improve your 60'. The amount of inertia energy available to help increases exponentially with launch rpm.
In a typical stick shift 355 sbc rotating assy with a 10.5" diaphragm clutch and 18lb flywheel, 1 unit of inertia is equal to about 4.9 ftlb applied over 1 second. 4.9ftlb/seconds might not seem like a lot, but over a tighter time frame, the numbers start to get interesting. For example, 10 units of energy could be expressed as 49 ftlbs applied over 1.0 seconds, or 98ftlbs applied over 0.50 seconds, or 196ftlbs applied over 0.25 seconds.
Here's a comparison of how launch rpm increases the amount of stored energy available...
...Say you launch at 4500 (20.25 units of inertia) and then draw the engine down to 3000 (9 units of inertia) with the clutch, 11.25 units of inertia would be used to assist the launch. Problem is, that 300ftlb engine is only producing 172hp after being draw down to 3000.
...If you launched at 6500 (42.25 units) and then drew the engine down to 4500 (20.25 units), now you are using 22 units of inertia to improve the 60'. Adding to that, the 300ftlb engine is now up to 257hp after being draw down to 4500.
Using the sbc example above to put a number on how much inertia energy can be worth...
...In the 4500rpm launch example above, 11.25 units of inertia assisting launch is equal to about 55ftlbs of assist for 1 second. If the clutch draws that energy out in half a second, the inertia torque added to the transmission's input shaft would double to 110ftlbs for half a second.
...In the 6500rpm launch example above, 42.25 units of inertia assisting launch is equal to about 207ftlbs of assist for 1 second. If the clutch were to draw that 2000rpm out in half a second, the inertia torque added to the transmission's input shaft would double to 414ftlbs for half a second. That 2000 more rpm produced a 3.76x increase over the 4500rpm launch number.
What the ClutchTamer does is allow you to adjust how fast the clutch draws inertia out of the engine. I look at inertia energy like a short duration hit of nitrous to help get the car moving. A fast intense inertia hit will draw the engine down where it makes less hp, where a slower inertia draw is less intense but allows the car to gain more ground speed before the clutch locks up which raises the engine's average hp output during launch.
Grant
Here's a nice round number comparison of how raising launch rpm improves engine output...
...A flat torque curve 300ftlb engine is only making 257hp at launch if you dump the clutch at 4500rpm. If the clutch then draws the engine down to 3000rpm after launch, now that 300ftlb engine is only making 172hp as it starts its climb to the shift point.
...That 300ftlb engine improves to 370hp at launch (113hp improvement) if you dump the clutch at 6500rpm. If the clutch then draws the engine down to 4500rpm, that 300ftlb engine is now making 257hp (85hp improvement) as it starts its climb to the shift point.
More launch rpm not only increases the engine's average HP production during launch, but it also increases the amount of inertia energy available to improve the 60'. Inertia energy is basically power that gets produced before the clock starts ticking, which gets stored as rpm in the engine's rotating assy. That energy can then be drawn out after the clocks start running to improve your 60'. The amount of inertia energy available to help increases exponentially with launch rpm.
In a typical stick shift 355 sbc rotating assy with a 10.5" diaphragm clutch and 18lb flywheel, 1 unit of inertia is equal to about 4.9 ftlb applied over 1 second. 4.9ftlb/seconds might not seem like a lot, but over a tighter time frame, the numbers start to get interesting. For example, 10 units of energy could be expressed as 49 ftlbs applied over 1.0 seconds, or 98ftlbs applied over 0.50 seconds, or 196ftlbs applied over 0.25 seconds.
Here's a comparison of how launch rpm increases the amount of stored energy available...
...Say you launch at 4500 (20.25 units of inertia) and then draw the engine down to 3000 (9 units of inertia) with the clutch, 11.25 units of inertia would be used to assist the launch. Problem is, that 300ftlb engine is only producing 172hp after being draw down to 3000.
...If you launched at 6500 (42.25 units) and then drew the engine down to 4500 (20.25 units), now you are using 22 units of inertia to improve the 60'. Adding to that, the 300ftlb engine is now up to 257hp after being draw down to 4500.
Using the sbc example above to put a number on how much inertia energy can be worth...
...In the 4500rpm launch example above, 11.25 units of inertia assisting launch is equal to about 55ftlbs of assist for 1 second. If the clutch draws that energy out in half a second, the inertia torque added to the transmission's input shaft would double to 110ftlbs for half a second.
...In the 6500rpm launch example above, 42.25 units of inertia assisting launch is equal to about 207ftlbs of assist for 1 second. If the clutch were to draw that 2000rpm out in half a second, the inertia torque added to the transmission's input shaft would double to 414ftlbs for half a second. That 2000 more rpm produced a 3.76x increase over the 4500rpm launch number.
What the ClutchTamer does is allow you to adjust how fast the clutch draws inertia out of the engine. I look at inertia energy like a short duration hit of nitrous to help get the car moving. A fast intense inertia hit will draw the engine down where it makes less hp, where a slower inertia draw is less intense but allows the car to gain more ground speed before the clutch locks up which raises the engine's average hp output during launch.
Grant
Last edited:
Hyper_pak
Old School Chrysler Fan
4.88
Hyper_pak
Old School Chrysler Fan
The picture with the wheelie bars is how it came to me from Washington State.
I run a 29.5 X 12 wide tire on the Colt now.
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