Looking for Fastlane, the Beast needs help - Page 2 - ZR-1 Net Registry Forums

Hammer · 10-25-2009

That is a great video, thanks for sharing.

Daves obsession · 10-25-2009

Hi, Fast Lane, thanks for posting, You have already helped me, by confirming that its not a big deal to make the change. I was at the stage of just buying one and looking at the pieces to figure how to make it work. I will build a quick list of questions and get back to you. your video is cool! love to have had that motor on the salt !

I can't wait to get a close ratio 5 speed , even the 5 miles on the salt is a drag race. With the car weighing in at 4800-5000# it takes keeping the car in the power band 100% of the time.

fastlane · 10-25-2009

Quote:

Originally Posted by Daves obsession

Hi, Fast Lane, thanks for posting, You have already helped me, by confirming that its not a big deal to make the change. I was at the stage of just buying one and looking at the pieces to figure how to make it work. I will build a quick list of questions and get back to you. your video is cool! love to have had that motor on the salt !

I can't wait to get a close ratio 5 speed , even the 5 miles on the salt is a drag race. With the car weighing in at 4800-5000# it takes keeping the car in the power band 100% of the time.

Why so heavy?

jonszr1 · 10-25-2009

i believe its to help with traction on the salt .i hear its like driving on snot . sorry dont know how else to put it

Daves obsession · 10-25-2009

4.5 inch tires require significant weight for traction.
You need to get the power to the ground and it takes a lot of weight on the axles and under the axles. Because of the high rear gears (2.59) a four wheel drive truck is pushing hard from behind to get the car to 40 mph at the 1/4 before you launch. Now its going to spin in first period, just going to happen, so its a short shift, and now you have to be on the wood early in second gear without spinning. To get to 230 mph at 5 miles requires getting to 215 by the 2 mile mark. While trying to go from 215 to 230 the track is going by at 291 feet per second, and the remaining 3 miles gets pretty short.

The rest begins with lift on the front, at 200 mph, there is about 440# of lift, at 220 mph its more like 880#. Now we know loose is fast but at 230 mph loose can be a spin and a spin can turn into a really bad thing.

so we run with 500 or so # on the front, which in turn lightens the back, so 1000 in the back is a good starting point.

For example, we were running at 4800# when we took 100# off the rear, the 2 mile times were slower and the tires started breaking loose at 215 mph. Causing the car to walk side to side. We needed more weight in the rear and more ponies.

Anyhow long answer for a short question

Dave

fastlane · 10-25-2009

Quote:

Originally Posted by Daves obsession

4.5 inch tires require significant weight for traction.
You need to get the power to the ground and it takes a lot of weight on the axles and under the axles. Because of the high rear gears (2.59) a four wheel drive truck is pushing hard from behind to get the car to 40 mph at the 1/4 before you launch. Now its going to spin in first period, just going to happen, so its a short shift, and now you have to be on the wood early in second gear without spinning. To get to 230 mph at 5 miles requires getting to 215 by the 2 mile mark. While trying to go from 215 to 230 the track is going by at 291 feet per second, and the remaining 3 miles gets pretty short.

The rest begins with lift on the front, at 200 mph, there is about 440# of lift, at 220 mph its more like 880#. Now we know loose is fast but at 230 mph loose can be a spin and a spin can turn into a really bad thing.

so we run with 500 or so # on the front, which in turn lightens the back, so 1000 in the back is a good starting point.

For example, we were running at 4800# when we took 100# off the rear, the 2 mile times were slower and the tires started breaking loose at 215 mph. Causing the car to walk side to side. We needed more weight in the rear and more ponies.

Anyhow long answer for a short question

Dave

Does the class not allow body mods such as wings and spoilers for added down force.

Daves obsession · 10-25-2009

No mods to the body, with the exception of the hood, and removal of Mirrors.

you have to run them as they were born, no panning, venting of any kind.

In most cases the drag induced from wings and such in not worth the Hp loss. Folks prefer a car with no rear spoiler, choosing Lead instead for down force.

Daves obsession · 10-26-2009

The 4 x 4 Dualy would really have to work to get the car up to speed. Last picture is the car at about 220 mph, note the lift on the front , even the rear is seeing 200 plus # of lift.

10-25-2009	#11
Hammer Join Date: Apr 2006 Location: Ideho Posts: 2,647	Re: Looking for Fastlane, the Beast needs help That is a great video, thanks for sharing.

10-25-2009	#12
Daves obsession Join Date: Oct 2009 Location: Conroe Texs Posts: 5	Re: Looking for Fastlane, the Beast needs help Hi, Fast Lane, thanks for posting, You have already helped me, by confirming that its not a big deal to make the change. I was at the stage of just buying one and looking at the pieces to figure how to make it work. I will build a quick list of questions and get back to you. your video is cool! love to have had that motor on the salt ! I can't wait to get a close ratio 5 speed , even the 5 miles on the salt is a drag race. With the car weighing in at 4800-5000# it takes keeping the car in the power band 100% of the time.

10-25-2009	#14
jonszr1 Join Date: Sep 2006 Location: lone pine and mammoth lakes Posts: 1,406	Re: Looking for Fastlane, the Beast needs help i believe its to help with traction on the salt .i hear its like driving on snot . sorry dont know how else to put it

10-25-2009	#15
Daves obsession Join Date: Oct 2009 Location: Conroe Texs Posts: 5	Re: Looking for Fastlane, the Beast needs help 4.5 inch tires require significant weight for traction. You need to get the power to the ground and it takes a lot of weight on the axles and under the axles. Because of the high rear gears (2.59) a four wheel drive truck is pushing hard from behind to get the car to 40 mph at the 1/4 before you launch. Now its going to spin in first period, just going to happen, so its a short shift, and now you have to be on the wood early in second gear without spinning. To get to 230 mph at 5 miles requires getting to 215 by the 2 mile mark. While trying to go from 215 to 230 the track is going by at 291 feet per second, and the remaining 3 miles gets pretty short. The rest begins with lift on the front, at 200 mph, there is about 440# of lift, at 220 mph its more like 880#. Now we know loose is fast but at 230 mph loose can be a spin and a spin can turn into a really bad thing. so we run with 500 or so # on the front, which in turn lightens the back, so 1000 in the back is a good starting point. For example, we were running at 4800# when we took 100# off the rear, the 2 mile times were slower and the tires started breaking loose at 215 mph. Causing the car to walk side to side. We needed more weight in the rear and more ponies. Anyhow long answer for a short question Dave Last edited by Daves obsession; 10-25-2009 at 03:37 PM.

10-25-2009	#17
Daves obsession Join Date: Oct 2009 Location: Conroe Texs Posts: 5	Re: Looking for Fastlane, the Beast needs help No mods to the body, with the exception of the hood, and removal of Mirrors. you have to run them as they were born, no panning, venting of any kind. In most cases the drag induced from wings and such in not worth the Hp loss. Folks prefer a car with no rear spoiler, choosing Lead instead for down force.

10-26-2009	#18
Daves obsession Join Date: Oct 2009 Location: Conroe Texs Posts: 5	Re: Looking for Fastlane, the Beast needs help The 4 x 4 Dualy would really have to work to get the car up to speed. Last picture is the car at about 220 mph, note the lift on the front , even the rear is seeing 200 plus # of lift. Last edited by Daves obsession; 10-26-2009 at 11:15 AM.