I have an '89 Volvo 240DL that is using the Turbo Fuel and Ignition computers. I would love to have more control over ignition without going to Megasquirt or some other full blown aftermarket EMS. Simply, I would like to have dynamice control over ignition as the boost / rpm increases, which it sounds like Megajolt is capable. However, I still have some questions.
1) Can it work with the Bosch LH 2.4 / EZK 116?
2) If yes, I presume it can be run using a MAP sensor and RPM signal?
3) How would this compare to something like the MSD Digital-7 w/Boost Retard Curve?
Cheers,
BDKR
For use with Bosch LH 2.4 (Volvo/Saab)?
Moderators: JeffC, rdoherty, stieg, brentp
Partial reply....
1) Almost certainly not - unless the Bosch/EZK system is funtionally and electrically identical to the proprietary Ford EDIS implementation, which is highly unlikely
2) n/a
3) From http://www.msdignition.com/ignition_22_7535.htm
* Map a timing curve based on boost pressure. - yes
* Plot timing curves down to 0.1° every 100 rpm - debatable, MJLJ interpolates down to 100 rpm accuracy (I think) between RPM bins, but it doesn't allow you to specify a curve between the adjacent RPM values. I'm also not sure on the resolution of the interpolated answer - it might only be to the nearest degree - but I stand to be corrected
* Control each cylinder’s ignition timing by up to 10° - no
* Select different rpm shift points for each gear shift - no
* Program a specific timing curve for each gear - no
* Three stages of retard for multiple nitrous systems - no
...so not fantastically in favour of the MJLJ - until you take price and value for money into account, that is
2) n/a
3) From http://www.msdignition.com/ignition_22_7535.htm
* Map a timing curve based on boost pressure. - yes
* Plot timing curves down to 0.1° every 100 rpm - debatable, MJLJ interpolates down to 100 rpm accuracy (I think) between RPM bins, but it doesn't allow you to specify a curve between the adjacent RPM values. I'm also not sure on the resolution of the interpolated answer - it might only be to the nearest degree - but I stand to be corrected
* Control each cylinder’s ignition timing by up to 10° - no
* Select different rpm shift points for each gear shift - no
* Program a specific timing curve for each gear - no
* Three stages of retard for multiple nitrous systems - no
...so not fantastically in favour of the MJLJ - until you take price and value for money into account, that is
Thanx for the response. The
Thanx for the response. The more I dove into what EDIS is, the more I realized it wasn't going to be so easy.
And I don't want to spend the money on a Digital-7. LOL!
Cheers
And I don't want to spend the money on a Digital-7. LOL!
Cheers
Martin is correct. Linear
Martin is correct. Linear interpolation is done on 100 RPM increments and 1 KPA increment (or 1/255's of a full TPS range), with a 1 degree resolution.
Everything else is dependent upon what the Ford EDIS module can do.
Probably a next generation controller will eliminate the EDIS module, but use the same sensor and trigger wheel configuration which will allow drop in replacements. Then we can have full control of things!
To sense what gear you're in requires sensing wheel speed, and comparing that with RPM, no?
Brent
Everything else is dependent upon what the Ford EDIS module can do.
Probably a next generation controller will eliminate the EDIS module, but use the same sensor and trigger wheel configuration which will allow drop in replacements. Then we can have full control of things!
To sense what gear you're in requires sensing wheel speed, and comparing that with RPM, no?
Brent