1972 SL 107,SL450 DJET TO MEGASQUIRT CONVERSION M117 ENGINE SQUIRT & SPARK, PERTRONIX
Dear Forum members i have finally bit the bullet and decided to convert my 1972 SL 450 running old tired Bosch D-JET to modern sexy Megasquirt. :angel
Reason i am sharing this is to give back something to the community and in the process learn something my self.
Had it not been for the exisitng post on the internet i dont think this conversion would have been possible. Special thanks goes to all those posted and always help others out you know who you are
and Richard Oleson, who also converted his 1974 Djet to MS his conversion can be viewed here https://www.flickr.com/photos/rick_oleson/albums/72157650166253696/with/22854768445/
Lets go in to why i decided to go down the route of megasquirt and what is megasquirt.
Megasquirt is a electronic fuel injection management computer. It collects data off sensors like TPS lambda MPS and based on set of rules injects correct amount of fuel so the combustion in the engine is at its optimum that in turn makes the car purr like a tiger.... So i know there is a camp of people who say that back in the days it used to be built to last, well that maybe the case with furniture , but anything electronic was always reliant on semi mechanical input and this is where D-JET suffers a lot, The Distributor points , TPS and MPS all have common issue they deteriorate with use due to physical contact. Further more D-JET is slow and has no feedback on exactly what the engine is up to apart from MPS. So it is preset to do one thing and can not adapt to different condition as well as MS could.
With megasquirt we can illuminate points cold start vale and much more and have a old engine being manage with new ECU.
So the plan is
Completely take out old D-JET and its components.
Instead i am going to use a
Megasquirt 2
Bosch TPS sensor
Bosch EV1 High impedance injectors
Innovate wideband 02 sensor
New wiring harness
As it stands i converted the Distributor points to Pertronix ignitor and flamethrower. This is going to help me a lot as MS needs a trigger i.e it needs some kind of feedback of engine rpm, since the Pertronix uses a hall effect sensor we can feed this data to MS ecu. Since i have a v8, every 8 pulses generated by pertronix ignitor are going to let our ecu know that engine done 1 revelation. On top of that i can use my Pertronix system to also control ignition spark timing advance with help of MS ecu.
The timing is going to be controlled in the following way i am going to lock out the vacuum advance set the timing with timing gun to 8-10 BTDC(before top dead center) and make sure that MS ecu knows that my current timing is 8-10 BTDC for example from there using a squirt and spark table and some cleaver algorithm the MS ecu will fire the flamethrower when ever it needs to i.e it can delay it slightly or advance it slightly.
So far i figured out a way to install my EV1 injectors on the existing D-Jet manifold which i am super pleased about as this one of the most worrying aspects of the whole conversion. Essentially after carefully examining this injectors i released that i could get rid of the plastic mould that sits on top the inejctors exposing the metal shaft . This meant that i could get away from using any adapters and directly hooking up my new injectors to the fuel rail yey!
This is work in progress and i am only just getting started, more updates to follow plus lots and lots of pictures
Dear Forum members i have finally bit the bullet and decided to convert my 1972 SL 450 running old tired Bosch D-JET to modern sexy Megasquirt. :angel
Reason i am sharing this is to give back something to the community and in the process learn something my self.
Had it not been for the exisitng post on the internet i dont think this conversion would have been possible. Special thanks goes to all those posted and always help others out you know who you are
and Richard Oleson, who also converted his 1974 Djet to MS his conversion can be viewed here https://www.flickr.com/photos/rick_oleson/albums/72157650166253696/with/22854768445/Lets go in to why i decided to go down the route of megasquirt and what is megasquirt.
Megasquirt is a electronic fuel injection management computer. It collects data off sensors like TPS lambda MPS and based on set of rules injects correct amount of fuel so the combustion in the engine is at its optimum that in turn makes the car purr like a tiger...
. So i know there is a camp of people who say that back in the days it used to be built to last, well that maybe the case with furniture , but anything electronic was always reliant on semi mechanical input and this is where D-JET suffers a lot, The Distributor points , TPS and MPS all have common issue they deteriorate with use due to physical contact. Further more D-JET is slow and has no feedback on exactly what the engine is up to apart from MPS. So it is preset to do one thing and can not adapt to different condition as well as MS could.With megasquirt we can illuminate points cold start vale and much more and have a old engine being manage with new ECU.
So the plan is
Completely take out old D-JET and its components.
Instead i am going to use a
Megasquirt 2
Bosch TPS sensor
Bosch EV1 High impedance injectors
Innovate wideband 02 sensor
New wiring harness
As it stands i converted the Distributor points to Pertronix ignitor and flamethrower. This is going to help me a lot as MS needs a trigger i.e it needs some kind of feedback of engine rpm, since the Pertronix uses a hall effect sensor we can feed this data to MS ecu. Since i have a v8, every 8 pulses generated by pertronix ignitor are going to let our ecu know that engine done 1 revelation. On top of that i can use my Pertronix system to also control ignition spark timing advance with help of MS ecu.
The timing is going to be controlled in the following way i am going to lock out the vacuum advance set the timing with timing gun to 8-10 BTDC(before top dead center) and make sure that MS ecu knows that my current timing is 8-10 BTDC for example from there using a squirt and spark table and some cleaver algorithm the MS ecu will fire the flamethrower when ever it needs to i.e it can delay it slightly or advance it slightly.
So far i figured out a way to install my EV1 injectors on the existing D-Jet manifold which i am super pleased about as this one of the most worrying aspects of the whole conversion. Essentially after carefully examining this injectors i released that i could get rid of the plastic mould that sits on top the inejctors exposing the metal shaft . This meant that i could get away from using any adapters and directly hooking up my new injectors to the fuel rail yey!
This is work in progress and i am only just getting started, more updates to follow plus lots and lots of pictures
