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03-24-2016, 09:55 AM
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#1
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11 sec club
Join Date: Aug 2014
Location: Woodbridge
Posts: 834
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Drag Bar question
So I bought the BMR extreme drag bar and installed it last week. Took the car for a ride and noticed it tightened up the car a lot. Not a bad thing. However for the 2nd time now the bar has moved in the bushings. 1st pass last week it shifted almost against the lower shock mount. So I fixed it and cranked down on the bolts a ton more then I thought it needed. Last night 1st 2 passes perfect didn't move a hair. Last run it slid over to the shock mount again. Anyone else have this issue? I'm not making that much power that the bar can't handle it.
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99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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03-24-2016, 10:11 AM
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#2
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11 Second Club
Join Date: Feb 2008
Location: Edison, NJ
Posts: 4,619
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Does BMR give you a torque spec for it? Could they be the wrong bushings? rubber/poly?
__________________
1999 Z28 Convertible. 6 speed swap, wide cowl hood, full hockey stripes, and a whining 10 bolt.
2008 Sierra Vortec Max. 6.2 swapped, headers, Magnaflow catback, GMPP CAI, NHT optioned tow package.
2006 GTO, 11.48 @ 118.3
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03-24-2016, 10:13 AM
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#3
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Did you preload it correctly when installing? Different brands have different installs.
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03-24-2016, 10:30 AM
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#4
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11 sec club
Join Date: Aug 2014
Location: Woodbridge
Posts: 834
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Poly bushings. I didn't pre-load it yet. I wanted to see what it would do without a pre-load.
4-5 good grunts after it was tight and I figured that was a good torque spec. I don't recall seeing the specs in the directions... However I wasn't really looking for them to be 100% honest.
__________________
99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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03-24-2016, 10:54 AM
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#5
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11 sec club
Join Date: Aug 2014
Location: Woodbridge
Posts: 834
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So after reading the directions, it seems as if it was installed properly. Other then maybe over tightening the bolts I can't see what the issue is. And I doubt I over tightened them. Even if I did why did it take until the 3rd pass to move.
__________________
99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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03-24-2016, 11:21 AM
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#6
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11 Second Club
Join Date: Feb 2008
Location: Edison, NJ
Posts: 4,619
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Does it say anything about having the suspension loaded vs hanging?
__________________
1999 Z28 Convertible. 6 speed swap, wide cowl hood, full hockey stripes, and a whining 10 bolt.
2008 Sierra Vortec Max. 6.2 swapped, headers, Magnaflow catback, GMPP CAI, NHT optioned tow package.
2006 GTO, 11.48 @ 118.3
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03-24-2016, 12:26 PM
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#7
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11 sec club
Join Date: Aug 2014
Location: Woodbridge
Posts: 834
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I had the car loaded when making the final connections. That's how they say to do it
__________________
99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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03-27-2016, 12:08 PM
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#8
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10 Second Club
Join Date: Feb 2008
Location: Eatontown
Posts: 1,647
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Are you using the U-bolt mounts that attach to the rear axle tubes? I constantly had to adjust mine because those mounts would slightly rotate over time. They really should be welded on along with the end link mounts
__________________
1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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03-27-2016, 01:20 PM
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#9
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11 sec club
Join Date: Aug 2014
Location: Woodbridge
Posts: 834
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Yea that's what it came with so that's what I'm using. Gonna have them welded when my welder gets a free min. That not the issue tho. They aren't moving the bar is moving in the bushing. The u-bolts and settles aren't moving. I marked them and there in the same place.
__________________
99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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03-27-2016, 01:33 PM
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#10
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,899
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What sort of pan hard bar do you have?
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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03-27-2016, 05:03 PM
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#11
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11 sec club
Join Date: Aug 2014
Location: Woodbridge
Posts: 834
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Adjustable QA1
__________________
99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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03-27-2016, 07:22 PM
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#12
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,899
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QA1 makes panhard bars?
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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03-27-2016, 08:07 PM
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#13
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Join Date: Feb 2016
Posts: 692
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Quote:
Originally Posted by LTb1ow
QA1 makes panhard bars?
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yes they do !
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03-27-2016, 08:29 PM
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#14
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,899
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Quote:
Originally Posted by 6spdg37s
yes they do !
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Did not know, thanks
So sounds like the rear end should be held pretty straight side to side, anything else moving around on the rear?
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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03-28-2016, 06:48 AM
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#15
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11 sec club
Join Date: Aug 2014
Location: Woodbridge
Posts: 834
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Had the car up on my trailer and looked everything over and all seems good. Everything was marked when it was torqued and all the marks still line up so nothing is loose. Going to reset the bar with some pre-load and see what happens on Weds.
__________________
99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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03-28-2016, 07:59 AM
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#16
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10 Second Club
Join Date: Feb 2008
Location: Eatontown
Posts: 1,647
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Aftermarket fixed length or adjustable LCA's? Maybe check that those bushings are in good shape.
The drag bars put a lot of stress on everything so I'm not too surprised that you see it moving a bit. I had to constantly re adjust mine even after just typical street miles, and that's was with the bar mounts, sfcs, and a solid 6pt welded in.
For bar preload I had best results with jacking the front up about 2" higher than the car typically rose at launch, and setting the end links there. It's a good idea to verify the pinion angle after you preload and set the car down too
__________________
1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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03-28-2016, 08:53 AM
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#17
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11 sec club
Join Date: Aug 2014
Location: Woodbridge
Posts: 834
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Aftermarket adjustable spherical LCA. And I'm going to set the pre-load like you said. BMR doesn't explain any setup procedure, however Spohn does and they recommend setting it up like you did. Front wheels up, driver in the car. So that's my next step.
__________________
99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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04-13-2016, 09:04 PM
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#18
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11 sec club
Join Date: Aug 2014
Location: Woodbridge
Posts: 834
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Found the fix to this sway bar issue. Two 1 3/8" split locking collars. 4 solid launches tonight and no movement. image.jpg
__________________
99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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04-14-2016, 05:59 AM
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#19
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Lord of the rings / 10 Second Club / Meet Coordinator
Join Date: Aug 2004
Location: Millstone Township, NJ
Posts: 6,358
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Nice. How did she run?
__________________
97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
17 Sierra 2500HD Dmax
81 Turbo TA
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04-14-2016, 06:11 AM
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#20
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11 sec club
Join Date: Aug 2014
Location: Woodbridge
Posts: 834
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image.jpg car #8835
Pretty consistent... 60 ft still not as good with the drag bar tho. Need a track rental to make some real time adjustments. Not waiting an hr between runs. However etown was empty lastnight.
__________________
99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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