Lotus Elan

Elan Sprint 123 Bluetooth Distributor for Weber engine

PostPost by: dpchamp87 » Fri Jun 26, 2020 8:33 pm

Has anyone got a good ignition map they could share? The one 123 suggest is hopeless.

Thanks in advance

David
dpchamp87
Second Gear
Second Gear
 
Posts: 81
Joined: 15 Jan 2010
Location: Darien CT USA

PostPost by: tdskip » Sat Jun 27, 2020 11:47 am

Hi David - I bought but have not actually installed or used a 123 for my GTV. Can't you modify the suggested one easily from the app? I may well be off base with that suggestion but seemed worth offering up.
SoCal
1969 Elan DHC
tdskip
Third Gear
Third Gear
 
Posts: 323
Joined: 13 Sep 2012
Location: SoCal

PostPost by: nmauduit » Sat Jun 27, 2020 1:26 pm

checking notes taken during a dyno session I have retained

1k 12°
1.4k 18°
2k 25°
3.5k 32°
5k 34°
6.8k 34°
8k 19° (sort of safety precaution in case the rev limiter does not work somehow)
You may reduce the total advance if you are unsure of the octane level of your favorite fuel, or depending on your actual tune and goals etc. I use NGK BP6ES plugs on the road, 7 for track days.

also have implemented some kind of idle stabilization at 1k rpm with something like (don't have the exact value at hand but you'll get the idea)
0k 0°
0.5k 15°

std disclaimer : no warranty of any sort, expressed or implied...
Last edited by nmauduit on Sat Jun 27, 2020 2:54 pm, edited 1 time in total.
S4SE 36/8198
User avatar
nmauduit
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1486
Joined: 02 Sep 2013
Location: France

PostPost by: h20hamelan » Sat Jun 27, 2020 2:25 pm

dpchamp87 wrote:Has anyone got a good ignition map they could share? The one 123 suggest is hopeless. David


Have you got it to start and run?
W. Kootenays B.C. Canada
Born, and brought home from the hospital (no seat belt (wtf)) in a baby!
Find out where the limits are, and start from there
User avatar
h20hamelan
Fourth Gear
Fourth Gear
 
Posts: 501
Joined: 25 Sep 2010

PostPost by: awatkins » Sat Jun 27, 2020 4:47 pm

I’m curious; what map does 123 suggest?
awatkins
Second Gear
Second Gear
 
Posts: 71
Joined: 23 Sep 2015
Location: California

PostPost by: nmauduit » Sat Jun 27, 2020 5:38 pm

awatkins wrote:I’m curious; what map does 123 suggest?


I think it's the same dizzy for Kent crossflow engines, so it could be for that as a primary application...
S4SE 36/8198
User avatar
nmauduit
Coveted Fifth Gear
Coveted Fifth Gear
 
Posts: 1486
Joined: 02 Sep 2013
Location: France

PostPost by: awatkins » Sat Jun 27, 2020 5:45 pm

Sorry, what I meant was, what advance curve as in list of “x degrees at y rpm” do they recommend? And for that matter, what makes it “hopeless?”
awatkins
Second Gear
Second Gear
 
Posts: 71
Joined: 23 Sep 2015
Location: California

PostPost by: dpchamp87 » Sat Jun 27, 2020 6:57 pm

Thanks for the replies. I have got the car to start and run. It starts and ticks over ok and on full throttle it is fine. However the throttle response is just nor good at all.

The 123 recommended map is as follows:

500 = 12
1000 = 17.6
2500 = 28.7
4500 = 32.8
6500 = 36
8000 = 36

Using those settings the car felt like it had too much total advance and on full throttle it did not sound smooth. I run VP C9 96 R+M/2 in the car. The motor is standard big valve Weber TC with only a slightly higher compression.

I them modified the curve to be:

500 12
1000 = 17.6
2500 = 25
4500 = 28
6500 = 30
7000 = 30

When we dyno'd the engine after it was built we used 30 degrees max advance.

I can just keep playing with it but I was hoping someone else had already done so!
dpchamp87
Second Gear
Second Gear
 
Posts: 81
Joined: 15 Jan 2010
Location: Darien CT USA

PostPost by: awatkins » Sat Jun 27, 2020 7:06 pm

For what its worth, this topic
viewtopic.php?f=38&t=1996
does a good job of documenting the various factory curves.
awatkins
Second Gear
Second Gear
 
Posts: 71
Joined: 23 Sep 2015
Location: California

PostPost by: awatkins » Sat Jun 27, 2020 7:08 pm

But note well the confusion over crank vs. distributor degrees. You have to read all the way to the end to get at the properly documented curves.
awatkins
Second Gear
Second Gear
 
Posts: 71
Joined: 23 Sep 2015
Location: California

PostPost by: dpchamp87 » Sat Jun 27, 2020 8:32 pm

For what its worth, this topic
viewtopic.php?f=38&t=1996
does a good job of documenting the various factory curves.

Excellent; thanks for this info. I presume the right hand table applies to the Sprint engine on Webers and that the numbers have to be +12 for the starting static advance.
dpchamp87
Second Gear
Second Gear
 
Posts: 81
Joined: 15 Jan 2010
Location: Darien CT USA

Total Online:

Users browsing this forum: Bombay Racing Green, Pfreen and 10 guests