CSI ignition on a TVR 2500M

CSI ignition on a TVR 2500M

Author
Discussion

Xadeb

Original Poster:

12 posts

43 months

Tuesday 1st September 2020
quotequote all
Hello,
Does somebody already install a "CSI" distributor on his 2500M ?
I did it last week as the original distributor was defect.

I'm looking for the best position/curve ?

Thank you in advance !
Xa

Xadeb

Original Poster:

12 posts

43 months

Thursday 3rd September 2020
quotequote all
Hello,
I received from CSI the curves related to the Triumph TR6/250/5 engines.

With a standard engine, CSI recommends :
"An advance of 10 degrees from idle speed and a maximum advance of 30 degrees."
"You can try 4 and 8 first."
"With somewhat higher compression ratios, the max. Advance should be less, the curve 1,2,3,5,6 or 7 is intended for that."


Questions to the members having experience with the tuning of elec. ignitions (not my case...):
- What's a low/high compression version ?
- Which types curves I should test first ? 1..4 or 5..8 ?
- Do you think that these 2 types of curves are so different ?
- Do you think that the curves 5-8 are more critical for the engine (at long term) ?

"At low compression values "American versions" the advance can be more (curves 9,10,11,12,13,14,15 or 16)"
Apparently not advised by CSI for my case... but why they mention "American versions" ?


Thank you in advance for your support

Holmgren

2 posts

21 months

Sunday 19th June 2022
quotequote all
Hi
Which curve Did you end up with? I have an TR6-74 us and have curve 8 now

TVR by BVR

71 posts

135 months

Sunday 19th June 2022
quotequote all
All US Tr6 engine are low compression, use the highest octane fuel you can get, ignition timing with a STD camshaft between 10-12 dgrs don't go higher than that because the engine will start to ping.

Holmgren

2 posts

21 months

Sunday 19th June 2022
quotequote all
Hi
Do you think its wrong with curve nr8?

TVR by BVR

71 posts

135 months

Monday 20th June 2022
quotequote all
It is very simple, drive the car till the engine is on temperature, go full throttle in let's say third and fourth gear if the ignition doesn't ping go a step further and repeat the procedure till the ignition pings and than you go one step back that way you will have the maximum curve available.

Mercdriver

1,909 posts

32 months

Monday 20th June 2022
quotequote all
I had a 2500M in the 90’s with American spec engine. P1$$ poor performance!

Look at a TR6 head, near the front of the head is a web in the casting and compare it to your head. The difference if I remember is about a mm. either bin your head and get a TR6 head or have a machine shop remove material from the head to make it a TR6 one.

I did the above, fast road cam and twin SU’s, electronic ignition garage reckoned it was good for 170bhp at flywheel.

Are there no triumph specialists where you are?