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Re: [Fot] TR4/6 IRS Spring Rate

Subject: Re: [Fot] TR4/6 IRS Spring Rate
From: Jim Prettyleaf <>
Date: Sun, 25 Jan 2009 21:45:27 -0800 (PST)
I have rear springs with the 0.62 diameter wire and four active coils at the
rear of my TR-6 auto-X car.  According to a spring calculator they could be as
stiff as 970 lbs per inch if the  torsional modulus = 10E6 pounds/sq inch. 
The rear syaybar is solid 11/16" diameter 4130 with 9.5" lever arms.  The
front springs are a bit softer, but not much.  My TR-6 makes a cement mixer
feel like a soft cushy ride, so driving to events on the street can be a
jarring experience if the pavement is rough.   
Someday I gotta stop racing my car every month so that I will have enough time
to pull the springs and have them accurately measured.
J. Prettyleaf> wrote:

From: <>
Subject: Re: [Fot] TR4/6 IRS Spring Rate
Date: Thursday, January 22, 2009, 9:17 AM


Those aren't springs...they're solid blocks!

Seriously, I've wanted to run stiffer springs myself and just haven't
gotten to it yet...where did I put that list?
I have spring that are 600 in the front and 500 in the rear,? I run those
a 7/8" front sway bar with about a 5" lever arm and a 9/16" rear
with about a 10" lever arm.? The car is neutral just about anywhere and
everywhere, except hard trail tends to get just a tad tail
The car could be stiffer as it does take moment too long to settle in a
Now I have an end point for further mods...800 & 1000 jeez...

Spring is, just around the corner...
???????????????????????????????? Nick in Nor Cal


-----Original Message-----
From: Gasket Works <>
To:; FOT <>
Sent: Thu, 22 Jan 2009 7:11 am
Subject: Re: [Fot] TR4/6 IRS Spring Rate

#800lbs/inch for rear and #1000lbs/inch front

Gasket Works USA, LLC
626.358.1616 Voice
626.628.3777 Fax
GMT -8  Pacific
----- Original Message -----
From: "Dennis DeLap" <>
To: "FOT" <>
Sent: Wednesday, January 21, 2009 3:47 PM
Subject: [Fot] TR4/6 IRS Spring Rate

> AMICI - specifically all of you TR4A,TR250,TR6 racers.
> I am building a Triumph Special with Triumph IRS.
> Can you give me a ballpark # that you are using for spring rate on the
rear of your cars?
> Thanks
> Dennis DeLap
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