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Author Topic:   Cal-Trac's; how much preload...
Ryan Wilke

Posts: 2494
From: Stanton, Michigan 49707
Registered: Oct 2000

posted 05-14-2002 12:41 PM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
...adjustment is everyone using?

The instructions say to use one turn of pre-load. How does the amount of pre-load affect your launch?

I'm looking for advise for use with a 3300# '69FB, 4-spd'd, 302, with new 5-leafs, 9204 Rancho's, 9" ET-Streets, 4.56 gears....

Thanks!!! Ryan

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Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 05-14-2002 01:01 PM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
Originally posted by Ryan Wilke:
...adjustment is everyone using?

The instructions say to use one turn of pre-load. How does the amount of pre-load affect your launch?

Thanks!!! Ryan

Ryan, I spoke to Cal-trac about this very subject a couple of weeks ago and this is what he told me. Changing the amount of preload changes how quickly the suspension reacts. More preload equals quicker suspension reaction. Basically you can slow down the hit to the suspension with less preload(lets it roll out a little bit before reacting). It still hits it the same amount it just takes a little longer to happen with less preload.

With that said I'll hopefully be trying some different preload settings this Fri. at the track. I've changed from 4.11's to 4.56's and expect to have to make some adjustments for the new gears. I would really like to get my 60's in the 1.4's. My best so far is a 1.55. Maybe I can get enough runs in to play around with preload. I mainly want to try and loosen my shocks up some and see what happens. I had some clutch problems last time out and didn't get to play much. We won't get it to that . Lets just say a little loctite would do wonders on the pressure plate bolts.

Almost forgot, I've have mine set at one turn of preload now. Seems to be working pretty good.

67 Coupe
393W, AFR 185, 4 Speed, 4.11 9 inch
7.09 @ 97MPH 1/8
1.55 60'
'66 Fairlane 500XL
Daily Driver

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Posts: 27499
From: Lyons, IL, USA
Registered: May 99

posted 05-14-2002 07:55 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
The thickness of a quarter gap is a good starting point.

Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link

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