Atomic ls efi
09-25-2020, 05:01 PM
#1
Senior Member
Thread Starter
Join Date: Jan 2001
Location: Canada
Posts: 523
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1992 GTA
Engine: running
Transmission: working
Axle/Gears: both
Atomic ls efi
Hi folks , I’ve bought a atomic ls efi system for my ls3 . Yes I realize it’s now discontinued but it’s all I have . Does anybody have one up and running? Mine is a cammed ls3 that put down 500 to the tires in a camaro it was pulled from .... it runs ok up to but I’m having low speed driving problems . Thx gta
09-25-2020, 05:14 PM
#2
Senior Member
Thread Starter
Join Date: Jan 2001
Location: Canada
Posts: 523
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1992 GTA
Engine: running
Transmission: working
Axle/Gears: both
Re: Atomic ls efi
I’m honestly wondering if I should toss the entire thing and go Holley ... the support is non existent sadly
03-02-2021, 10:24 PM
#4
COTM Editor
iTrader: (22)
Join Date: Mar 2001
Posts: 9,950
Likes: 0
Received 1,880 Likes
on
1,284 Posts
Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: Atomic ls efi
Toss the Atomic. You can't do fine tuning with it.
03-03-2021, 11:51 AM
#5
Senior Member
Thread Starter
Join Date: Jan 2001
Location: Canada
Posts: 523
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1992 GTA
Engine: running
Transmission: working
Axle/Gears: both
Re: Atomic ls efi
Yeah can’t toss , bought it long time ago , I got it running and driving well , it’d somewhat adjustable, I can move spark around , there are 3 fuel tables to start with and the ecm has learned and adjusted well .
im extremely disappointed that MSD and Holley offer no support whatsoever, I’ve spent hours on phone only to be met with “ we don’t support that anymore” . Surely I can’t be the only one 🤷♂️ Lol maybe I am . Oh well it cost a lot back then and it’s the only thing I have . I will make it work I’m used to figuring out things .
Sadly this entire project was honestly a huge waste of cash and time , but they mostly all are .
im extremely disappointed that MSD and Holley offer no support whatsoever, I’ve spent hours on phone only to be met with “ we don’t support that anymore” . Surely I can’t be the only one 🤷♂️ Lol maybe I am . Oh well it cost a lot back then and it’s the only thing I have . I will make it work I’m used to figuring out things .
Sadly this entire project was honestly a huge waste of cash and time , but they mostly all are .
03-03-2021, 07:46 PM
#6
COTM Editor
iTrader: (22)
Join Date: Mar 2001
Posts: 9,950
Likes: 0
Received 1,880 Likes
on
1,284 Posts
Car: '89 Firebird
Engine: 7.0L
Transmission: T56
03-03-2021, 08:16 PM
#7
Senior Member
Thread Starter
Join Date: Jan 2001
Location: Canada
Posts: 523
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1992 GTA
Engine: running
Transmission: working
Axle/Gears: both
Re: Atomic ls efi
Quick trip ,
I can only assume that you have had some experience with this particular type of ecm ? Yeah I know it’s not perfect but it’s actually not too bad . As I have the dyno graphs from when it was tuned with the stock ecm it would be interesting to see via dyno were it lands now ,
it’s something I may do this summer
I can only assume that you have had some experience with this particular type of ecm ? Yeah I know it’s not perfect but it’s actually not too bad . As I have the dyno graphs from when it was tuned with the stock ecm it would be interesting to see via dyno were it lands now ,
it’s something I may do this summer
Trending Topics
03-04-2021, 01:49 AM
#8
COTM Editor
iTrader: (22)
Join Date: Mar 2001
Posts: 9,950
Likes: 0
Received 1,880 Likes
on
1,284 Posts
Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: Atomic ls efi
Full throttle is easy, that's not the real test. Part throttle and drivability are the tough part and that's what you're complaining about. The Atomic is a "dumbed down" system that doesn't give you the ability to do detailed tuning to refine those things. I'm guessing your engine is kinda rowdy and you need custom tuning to work out the kinks. I'll be surprised if the Atomic has enough features to get you there.
The following users liked this post:
RockJay81 (11-26-2022)
03-04-2021, 08:37 AM
#9
Senior Member
Thread Starter
Join Date: Jan 2001
Location: Canada
Posts: 523
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1992 GTA
Engine: running
Transmission: working
Axle/Gears: both
Re: Atomic ls efi
Yeah me too . After I get it on a dyno I will have a good idea what it’s actually doing . I’ve been lucky it’s doesn’t stall like a lot of people had trouble with but no doubt . It’s not very tun-able but yeah I’m thinking if she don’t provide the known numbers or close to em , I will have to start again 🤷♂️ With a Holley as at least they have support
11-16-2022, 08:16 PM
#10
Senior Member
Thread Starter
Join Date: Jan 2001
Location: Canada
Posts: 523
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1992 GTA
Engine: running
Transmission: working
Axle/Gears: both
Re: Atomic ls efi
Well I honestly forgot about this post , I should update . I found the problem with the atomic ls system . There was a crossed wire in the MSD harness. I contacted the designer of the system and together we diagnosed it and with s simple pin swap the system is working very well .
I did end up on a chassis dyno , the AF ratio was spot on and it matched the hp and tq numbers when it was in the camaro!
over all it’s been running pretty darn good for s cammed engine. I’m a bit worried about parts as it’s no longer available but for the meantime I will use and enjoy it . 👍 never give up
I did end up on a chassis dyno , the AF ratio was spot on and it matched the hp and tq numbers when it was in the camaro!
over all it’s been running pretty darn good for s cammed engine. I’m a bit worried about parts as it’s no longer available but for the meantime I will use and enjoy it . 👍 never give up
Thread
Thread Starter
Forum
Replies
Last Post
chitowncruiser
Suspension and Chassis
14
01-20-2011 05:29 PM