Gear retard, 7531 box ?

MSD Digital Ignition Programming & Troubleshooting, Playing with Dots, Slew and other fun toys for traction challanged racers

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supernova
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Gear retard, 7531 box ?

Postby supernova » Sun Aug 08, 2010 4:58 pm

I'm having tire spin problems going into high gear ( 2 speed glide) and need some help with setting up a gear retard for it. I have a 7531 box.

Thanks
Black hood gang member!!!! :mrgreen: :mrgreen:

1972 Nova SS
572 C.I. BBC

Best to date: 1/8
et: 5.32
mph: 132
new wt. 3340 lbs

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vegaracer
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Re: Gear retard, 7531 box ?

Postby vegaracer » Sun Aug 08, 2010 5:53 pm

It senses gear changes automatically. So, leave your first gear graph with no timing pulled, and change your second gear graph to pull timing at the RPM's your having tire spin at.
Feenstra's Towing

1973 Vega
434 SBC, N.A.
Powerglide
9.01 @ 146

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supernova
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Re: Gear retard, 7531 box ?

Postby supernova » Sun Aug 08, 2010 5:57 pm

It's spinning the tires at the gear change. I'm not sure how to set it up.
Black hood gang member!!!! :mrgreen: :mrgreen:

1972 Nova SS
572 C.I. BBC

Best to date: 1/8
et: 5.32
mph: 132
new wt. 3340 lbs

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vegaracer
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Re: Gear retard, 7531 box ?

Postby vegaracer » Sun Aug 08, 2010 9:28 pm

First change your last gear to 2.
Image

Now go to the Gear Retard Curve screen or box, and select Show, and then Trace 2.
Image

Then make Trace 2 Active
Image

Then right click on the screen and select Add Dot.
Image

Now you'll have a dot wherever you right clicked at. It shows RPM on the left, and the amount of timing you want to pull on the right. I dropped it at 6800 because in your other topic you're saying the motor drops to 6880 on the gear change.
Image

Now left click on the dot or RPM/timing tag, and drag it to the RPM and retard amount you want. I pulled it down to 6800 and 5.0 degrees. You can change the RPM in 100RPM increments, and the timing in 0.1 degree increments.
Image

You can add as many dots and pull them to wherever you want.
Image
Feenstra's Towing

1973 Vega
434 SBC, N.A.
Powerglide
9.01 @ 146

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supernova
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Re: Gear retard, 7531 box ?

Postby supernova » Sun Aug 08, 2010 9:37 pm

How do you capture the gragh so you can post it? i would like to post some to discuse
Black hood gang member!!!! :mrgreen: :mrgreen:

1972 Nova SS
572 C.I. BBC

Best to date: 1/8
et: 5.32
mph: 132
new wt. 3340 lbs

User avatar
vegaracer
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Re: Gear retard, 7531 box ?

Postby vegaracer » Sun Aug 08, 2010 9:49 pm

I hit Print Screen on the keyboard, paste it into a program (I use Paint), save it to the computer, and then either upload it through the site, or post it on a photo hosting site like Photobucket, Flickr, Facebook.........
Feenstra's Towing

1973 Vega
434 SBC, N.A.
Powerglide
9.01 @ 146

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vegaracer
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Re: Gear retard, 7531 box ?

Postby vegaracer » Sun Aug 08, 2010 9:55 pm

I forgot to ask, you do have the dark blue wire hooked up to your transbrake switch? This runs the launch rev limit and also resets a bunch of things to their inital position, including the gear indicator. And the retard you program in for each gear is added on top of any retard you have in the box for that specific RPM.
Feenstra's Towing

1973 Vega
434 SBC, N.A.
Powerglide
9.01 @ 146

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supernova
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Joined: Sat Feb 02, 2008 7:35 pm
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Re: Gear retard, 7531 box ?

Postby supernova » Sun Aug 08, 2010 10:01 pm

I can't seem to get it to work like that
Black hood gang member!!!! :mrgreen: :mrgreen:

1972 Nova SS
572 C.I. BBC

Best to date: 1/8
et: 5.32
mph: 132
new wt. 3340 lbs

User avatar
vegaracer
Posts: 676
Joined: Mon Aug 20, 2007 1:12 pm
Location: Wyoming, Ontario, CANADA
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Re: Gear retard, 7531 box ?

Postby vegaracer » Sun Aug 08, 2010 10:03 pm

Does your keyboard have a FN or function key? You may have to press it and the print screen key at the same time.
Feenstra's Towing

1973 Vega
434 SBC, N.A.
Powerglide
9.01 @ 146

User avatar
supernova
Posts: 2548
Joined: Sat Feb 02, 2008 7:35 pm
Location: Ft.Worth Tx

Re: Gear retard, 7531 box ?

Postby supernova » Sun Aug 08, 2010 10:27 pm

I do not have a FN key. The dark blue wire is hooked up to the trans brake. The light blue wire is hooked up to the line lock. everything works like it should....
Black hood gang member!!!! :mrgreen: :mrgreen:

1972 Nova SS
572 C.I. BBC

Best to date: 1/8
et: 5.32
mph: 132
new wt. 3340 lbs

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John_Heard
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Re: Gear retard, 7531 box ?

Postby John_Heard » Mon Aug 09, 2010 11:52 am

This is a real handy little freebie tool for doing screen shots.

http://www.jingproject.com/

71Hellride
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Re: Gear retard, 7531 box ?

Postby 71Hellride » Mon Aug 09, 2010 2:48 pm

Just wanted to say great job vegaracer on posting this stuff. Probably the best how to i've seen.

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supernova
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Re: Gear retard, 7531 box ?

Postby supernova » Mon Aug 09, 2010 4:53 pm

how about this?
Attachments
gear_retard_4.png
Black hood gang member!!!! :mrgreen: :mrgreen:

1972 Nova SS
572 C.I. BBC

Best to date: 1/8
et: 5.32
mph: 132
new wt. 3340 lbs

User avatar
vegaracer
Posts: 676
Joined: Mon Aug 20, 2007 1:12 pm
Location: Wyoming, Ontario, CANADA
Contact:

Re: Gear retard, 7531 box ?

Postby vegaracer » Mon Aug 09, 2010 9:54 pm

That'll work. It's real easy to play with once you've done it a time or two. And you've likely done it three times now. :smt003
Feenstra's Towing

1973 Vega
434 SBC, N.A.
Powerglide
9.01 @ 146

User avatar
supernova
Posts: 2548
Joined: Sat Feb 02, 2008 7:35 pm
Location: Ft.Worth Tx

Re: Gear retard, 7531 box ?

Postby supernova » Thu Aug 12, 2010 6:23 am

vegaracer wrote:That'll work. It's real easy to play with once you've done it a time or two. And you've likely done it three times now. :smt003


Thanks for the help vegaracer.
We're going out on Friday and see what we got.

Thanks John.
Black hood gang member!!!! :mrgreen: :mrgreen:

1972 Nova SS
572 C.I. BBC

Best to date: 1/8
et: 5.32
mph: 132
new wt. 3340 lbs


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