Club Triumph

... the club for all Triumphs



Please log in to use the full features of this site, or register here
Username: Password: Remember? (in cookie) forgotten password?
Your shopping basket is empty


you are here -
Club Triumph - Cars - TR2-6
TR2-6

you are here -
Club Triumph forum - Cars - TR2-6 - Fitting the Aldon“Amethyst” Mappable Ignition
< Can one fit a J type overdrive box from a Saloon straight into a TR6? Fitting the Aldon“Amethyst” Mappable Ignition
"ibjean325"
posts: 2
non member
 posted Mon 5th Aug 2013


I have recently obtained and installed the “Amethyst”
Performance Mappable Ignition System for my 1972 TR6. The Amethyst is designed to replace the
centrifugal and vacuum advance units of our distributor.
The 1972 year Triumph was fitted with a vacuum retard module only, (the vacuum taken from the rear carb).  

I am looking to find information from  someone who has fitted and tuned this ignition system so we can compare notes.  What MAP characteristics did you did you try for the advance curve...and which one did you eventually settle on.  Did you configure the vacuum advance or not enter in any values?  If you used the vacuum advance - where did you obtain the vacuum from?

I would also like to find out if someone has a copy of a vacuum curve that I could use.

Thanks
ibjean325


Thanks
Tags - TR2 TR3 TR3A TR3B TR4 TR4A TR5 TR250 TR6
"Nick Jones"
posts: 8772
Wessex (Bristol & Bath) group
joined on Sat 19th Nov 2005
 posted Mon 5th Aug 2013 reply 1 of 2

Hi

Not used the Amethyst system but have been using the Megasquirt system (with FI also) for some years with good results and the ignition tables should give some clues.

Two tables are shown.

First is the one used on my 2.5PI
Second is the one used on my Vitesse 2L

Neither will necessarily be right for your engine but should give a starting point.  The full throttle line (100kPa) from the 2.5 will probably be closest for your engine.

You definitely want to be using some vacuum advance which makes a HUGE difference to part throttle torque and fuel economy.  

Cheers

Nick

 Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
Tags - TR2 TR3 TR3A TR3B TR4 TR4A TR5 TR250 TR6
"ibjean325"
posts: 2
non member
 posted Fri 9th Aug 2013 reply 2 of 2

Thanks for the information I will plug them in tomorrow and let you know.
Any suggestions on the vacuum, advance?
Originally my TR only had a vacuum retard that operated at lower RPM-an emissions feature.
Thanks
Tags - TR2 TR3 TR3A TR3B TR4 TR4A TR5 TR250 TR6


users online - Bingbot (9), carboy0, Googlebot Images, en-GB (3), SEMrushBot, Exabot, Ahrefs (19), wget, DotBot, guest (37), bl (26), Yandex (2), Rosbif, sparky_spit, Google Favicon, adscanner/ (2), CCBot, Baidu Spider, Yeti (2), Applebot, Majestic-12 DSearch (5), Howard, Googlebot (5)

Switch to mobile view

Club Triumph Ltd. Registered in England No. 4961210 Registered Office: Suite A,10th Floor, Maple House, High Street, Potters Bar, Herts, EN6 5BS. Club Triumph is run entirely by its members for its members and does not have paid employees.

Website Terms and Conditions | Terms and Conditions of Sale | Club Rules