M Series Tips

M Series General Chassis Specifications

Suspension Setting Data

All Models

Track	Front: Toe in 0° 30' (1/8")
	Rear: Toe in 0° 15' (1/16")
Camber	Front: Vertical to 0° - 30' neg.
	Rear: 0° - 30' to 1° - 0' neg.

Overall squareness: Tolerance 0.25"

Tyre Pressures: Front Rear
1600M/2500M 22 lb/sq." 24 lb/sq."

3000M/Turbo 24 lb/sq." 26 lb/sq."

Tyre Pressures:	Front	Rear
1600M/2500M	22 lb/sq."	24 lb/sq."
3000M/Turbo	24 lb/sq."	26 lb/sq."

This information came from a sheet entitled "M Series General Chassis Specifications". Two additional sheets that accompanied this cover rear suspension adjustment. This information is as correct as we can make it. If you use the data on these web pages and kill yourself, it's your fault, not ours. :-)

M Series General Chassis Specifications Rear Wheel Camber Adjustment Information Sheet Issue 2 Rear Wheel Track Adjustment Information Sheet Issue 2

Factory Specs For 2500M Springs from the TVRCCNA
Tech Tips (Data Provided by William Arzt)
Front Rear
Free Length 14 3/4" 13 14/"
ID 2.68" 2.26"
OD 3.562" 3.06"
Mean Dia. 3.125" 2.66"
Rate 135 lbs/in 140 lbs/in
Gauge .437 .400
Active Coils 12 3/4 13 3/4
Total Coils 14 1/4 15 1/4

Factory Specs For 2500M Springs from the TVRCCNA Tech Tips (Data Provided by William Arzt)
	Front	Rear
Free Length	14 3/4"	13 14/"
ID	2.68"	2.26"
OD	3.562"	3.06"
Mean Dia.	3.125"	2.66"
Rate	135 lbs/in	140 lbs/in
Gauge	.437	.400
Active Coils	12 3/4	13 3/4
Total Coils	14 1/4	15 1/4

Note that a front spring from an early 1974 2500M (removed from the car around 1985) measures 14" long unloaded and has a wire diameter of .443" . It has 14 coils + or - some fraction depending on where you count. The outer diameter is 3 1/2". The front springs were mounted using the two 1" collars described by Adrian Venn in the next article.

If you haven't purchased the TVRCCNA Tech Tips, do so, I'm not going to type the whole thing in to the computer.
-Webmaster

Adrian Venn Explains Early M & Vixen S4 Springs

One of the nice things about Vixen S4`s are that they are the 'M' chassis with the Vixen body, [one] problem is ... you cannot use the Spax shocks and collets on normal Armstrong, Monroe and or Koni shocks (as they pre-load the spring more than the already pre-loaded by design setup requires and raises the car). I think ALL 'M' chassis cars from 1972 -1974/5 (that inc. Vixen S4's) had the same springs on the front with alloy ride height spacers for different models of engine which causes problems when you get replacement springs these day as you can only get the later 14" free length springs and people can get confused by the spacer system.

e.g. Vixen S4 would have 1 spring with 1x1" spacer (1600 engine) the 1600M had the same but the 2500M had 1 spring with 1x1" on the bottom with 1 X 1" at the top, with the 3000M having 1 x 1/2" at the top with 1x 1" at the bottom......... A lot of useless information if you have a later car OR the previous owner has already changed to 14" springs.

These days the standard setup seems to have gone by the wayside and ride height adjustable shocks with shorter springs, with the correct spring rating, that is set to carry the weight of the car seems to have taken over the pre-loaded type system that TVR designed into the 1972 chassis. My business has sold it's first set of standard springs in 3 years this week! 01/03.

If you need the standard spring seats, alloy spacers or advice on anything "M" I have about 100,000 UKP of M spares.

Regards adrian@exactly-tvr.demon.co.uk
UK Phone: 01203596883 or 07956956042

This description about Vixen/M springs started as a letter from Adrian Venn to a Vixen owner who had problems with new springs. If people really need to read that tale I will try to contact the Vixen owner, or I will write about my adventures with ride height.
-Webmaster

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Last updated on March 23 2003.