How much horsepower do LCA brackets add?

[BMR Tech]

Mine added 67 rwhp and 88 rwtq....but they are a special "one-off" version.

I am glad you are happy with the quality and performance of our brackets. They are a great upgrade to the rear suspension, and offer a position for just about every situation an S197 owner would/could encounter.

Stock ride height, the upper position tends to be the most commonly used. I prefer the middle, at stock ride height, assuming straight-line being your main goal.

As stated, it's really good to test and see what position works best, I think you will end up putting it back in the middle position, but that's just a wild guess.

If you have any questions or concerns, please let me know.

 

[Weou09]

Not welded, I believe they will be fine.
Maybe in the future, who knows lol.
Per BMR these don't need to be welded (especially at my power level lol)

Weld them!!!!!!!!You and I have almost identical cars and I did this with them welded, with no penetration. Trust me this is not a fun experience.

 

[GrabberBlue5.0]

Any pics of the bracket?

 

[fdjizm]

Weld them!!!!!!!!You and I have almost identical cars and I did this with them welded, with no penetration. Trust me this is not a fun experience.

What happened there? more pics!
If you damaged brackets welded then what difference would it make? just making the bracket harder to replace. lol

 

[BMR Tech]

Weou09, is that a twisted axle tube or a damaged bracket?

 

[Weou09]

Any pics of the bracket?

No. One of the mounting bolts snapped and the bracket acted as a swivel. I could swing the driver side front to back once I got the tire off and the other bolt loose. A very nice guy at the track had a bolt and washer I used to get it home.

What happened there? more pics!
If you damaged brackets welded then what difference would it make? just making the bracket harder to replace. lol

The weld did not penetrate so essentially they were just bolted on.

 

[BMR Tech]

No. One of the mounting bolts snapped and the bracket acted as a swivel. I could swing the driver side front to back once I got the tire off and the other bolt loose. A very nice guy at the track had a bolt and washer I used to get it home.

Proper weld placement and length would/should have prevented that from happening.

I am very curious as to how a bolt snapped, the factory and aftermarket bolts are very beefy on the S197, and to break them typically takes an unrealistic amount of HP, or something wrong within the system.

I would love to see pictures. I assume these were the 2-hole brackets, and not the 3-position as pictured in this thread?

 

[Weou09]

Proper weld placement and length would/should have prevented that from happening.

I am very curious as to how a bolt snapped, the factory and aftermarket bolts are very beefy on the S197, and to break them typically takes an unrealistic amount of HP, or something wrong within the system.

I would love to see pictures. I assume these were the 2-hole brackets, and not the 3-position as pictured in this thread?

I don't think mine are BMR, I believe they a CHE, but they do have 3 positions. I have no idea how the bolt broke because they are indeed beefy, but if as you stated a proper weld would have prevented any stress on the bolts.

This is the run(yes it is a shitty video) You can see it happened just as I was getting ready to shift into second.

 

[BMR Tech]

Hmm. Well if you can get some pictures posted, that would be great!

 

[CPRsm]

Norm covered quite a bit. Too much angle can cause roll steer. But the CJ rear end is hanging so the angle is really extreme. Too much angle also gives a short instant center and lots of anti squat. Problem can be too much anti squat too soon and the tires will unload. So hooks really good and the spins. W a short IC your rear end will be trying to pick up the light end of the car. Farther foward tries to pick up more wieght. But needs more torque/power to apply leverage when it's out farther. Upper matters also like norm said. Its intersection w the lowers imaginary line places the instant center. Lower cars w stock uppers put the instant center very far back since it is angled down so hard.

 

[Weou09]

Hmm. Well if you can get some pictures posted, that would be great!

This happened in 2011 lol. That was the only shot my brother got before we started wrenching on it to get the car home.

 

[fdjizm]

Ok guys, I put it in my top hole.

Going to keep it there for a while, feels good man.
Just wanted to show you the angle of the dangle, I think this should work well on the street & strip.

 

[nasty281]

From what I have read, once the car is on the ground you want the LCA to be horizontal to the ground and since it looks like your car is still in the air you would have to drop it to find the best spot.

Ive heard you want it horizontal when the car is in its launch

 

[fdjizm]

^This or the rear still slightly lower.
I'll find out at the track in a few months!

 

[BMR Tech]

Ive heard you want it horizontal when the car is in its launch

That is a very general statement that you heard.

In a perfect world, you would want the car to not even move (up/down) while "hooking", and the LCA to stay parallel....but that is just not likely, most of the time.

The goal should not be the angle of the LCA when the car is in it's launch, but rather, the starting angle that leads the car to it's maximum launch potential. Our car, the LCA angle is MUCH more radical than the OP's...and the angle even gets slightly more radical upon launching, and we havent spun the tires in over a year on a launch.

 

[SonicGT]

Thread title made me laugh.

 

[cwhit23]

This is making me want to do suspension and I'm not even done with my motor.. lol Being pro-charged I can only imagine it won't be very long until I need a drive shaft and suspension.

The look good man, I'll be following along to see if you end up changing holes again and which works best. My car is lowered so I know it won't be the same but It'll give me an idea.

 

[Norm Peterson]

Ive heard you want it horizontal when the car is in its launch

That's closer to where you want it for good cornering behavior, at least in cars that use a roughly axle-height PHB or Watts link as the primary device for lateral axle location..


Norm

 

[fdjizm]

Oh yes something I noticed taking a turn "semi-hard" I have more oversteer, not sure how to describe it but the car has "more turn" to it. As in I don't have to turn the wheel as much as I used to, to take a hard turn.
Also hitting the gas making a 90* turn at low speed doesn't result in instant wheel spin.

 

[Norm Peterson]

Does "loose axle steer" work for you?


Norm