My 2014 American 242" swingarm chassis has a 350 lb rate spring. Running 1150ish HP aluminum block BBC combination. Car has a race weight of 1875lbs. Everything seem to be working OK, when doing a visual comparison to similar combinations my spring is compressed much more than others.
Curious what others are running and what the advantages may be. Educate me...

Be careful when looking at comparisons!

The geometry of the suspension of other brands could make the requirements for spring rates and heights very different!

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Be careful when looking at comparisons!

Agree 100%. Let me clarify, when comparing to similar American swingarm cars with aluminum BBC engines.

Just curious, have you made contact with Travis at American Race Cars to ask for his input?

After all, he has set up one or two of these over the years. He builds them and has made a couple laps in them as well...

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Just curious, have you made contact with Travis at American Race Cars to ask for his input?

Funny you should ask, yes. In the past on several different occasions I have called and emailed NEVER getting a response!

Have a secret code I can use for getting a response?

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I have called and emailed NEVER getting a response!

I called and emailed him about building me a brand new car...never responded

Mike, your $ is green and good everywhere. He clearly don't want you business, move on to those that do. Who else have you called?

IF you call Shelly at American racecars she can get you the answers. I have text and called her and she gets back to me within a day.

This message has been edited. Last edited by: S/C718,

I spent 15 minutes on the phone with Shane from Competitive Suspension. Shane answered all of my questions and has earned my business. The guy knows his stuff and tells you straight up if he can provide the required results using your existing components. Better yet, the man answered his phone when it rang.

Your spring rate is more because of the angle of the shock. My 08 American had a 400 lb spring on it. Ran 4.40’s at 156. All alum 632
Good luck

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Originally posted by 00 DEAD ON:
Your spring rate is more because of the angle of the shock. My 08 American had a 400 lb spring on it. Ran 4.40’s at 156. All alum 632
Good luck

Brian

That's only one piece to the puzzle so to speak! There's more to this deal. The easiest way to compare one car to another is to actually measure the shock vs rear end movement! This is what tells you the entire story. Racers can have the wrong spring in the car and not know it. If your having a shock built or modified you should measure this first and give that info to the shock company. As ratios move away from one to one and the shock begins to move less than the rear end does the more dampening you need/stiffer shock, along with a stiffer spring.