Legend Standalone Engine Management-AEM EMS a Reality. - Page 5

Dv8 · 07-16-07, 03:32 PM

Quote:

Originally Posted by BUZZARD

Really you want the ecu timeout.In the event of a major crash that ruptures the high pressure fuel line you have no safety shutoff.I implore you and other users to fully consider the implications.If you can give me a link to both wiring diagrams I can find a solution.

Relink time for an Autronic after ignition off-on cycle is 1-3 seconds. Some cheap aftermarket ecu's have relink times of up to two minutes.The price advantage of the cheap units is often lost in extra tuner time.I am used to tuff that works, thats all.

Chris

I have the NSX service manual, let me have a look in there and compare diagrams for the differences. Maybe Kenso can whip out some of his dealership print screens.

~Dv8

emaculate94GS · 07-16-07, 08:58 PM

So the problem with the fuel pump running constantly is really a big issue it seems.
For me, my car is a daily driver so I would not want to run the risk of damageing or even blowing up my self and or my car!

Buzzard, thanks for taking the initiative to look into this problem. When it comes to electrical diagrams I dont know my ass from my elbow.

I hope that there will be some sort of solution because I would really like to get this EMS installed in the near future.

Dv8 · 07-16-07, 10:10 PM

Quote:

Originally Posted by emaculate91ls

So the problem with the fuel pump running constantly is really a big issue it seems.
For me, my car is a daily driver so I would not want to run the risk of damageing or even blowing up my self and or my car!

Buzzard, thanks for taking the initiative to look into this problem. When it comes to electrical diagrams I dont know my ass from my elbow.

I hope that there will be some sort of solution because I would really like to get this EMS installed in the near future.

Now I do believe its going overboard with what people think will happend at 2nd click ignition with the ems. First click is the accesories second is fuel pump prime and all cluster lights, the the next 1/4 turns on the motor. Very seldom do you have to click to second click for anything other than starting the motor.

The fuel system has a return line all fuel over pressure returns back to the gas tank. All the pump is doing is remaining on and cycling more than it should, which in the grand scheme isnt that bad when you exercise common sence and start the motor right away. If you need to keep the 2nd click on then pull the fuel pump fuse out under the dash.
I agree that a solution should be figured out and Im' sure its fairly easy, I just didnt pay much attention to it because it wasnt a big problem for me. This problem is nothing that should stop someone from buying and installing the ultimate in tuning a Legend motor in a KA7/KA8. If your still not convinced, thats great. Imran, I, Mike Diaz, Hotstartup and whomever else will keep advancing and others will be left behind. I have no problem with that

~Dv8

BUZZARD · 07-17-07, 12:21 AM

Quote:

Originally Posted by Dv8

Now I do believe its going overboard with what people think will happend at 2nd click ignition with the ems. First click is the accesories second is fuel pump prime and all cluster lights, the the next 1/4 turns on the motor. Very seldom do you have to click to second click for anything other than starting the motor.

~Dv8

If the ignition is on the pump is running yes ? I you started the engie and it stalled the pump would still be running ?

Chris

Kenso · 07-17-07, 12:34 AM

Legend

NSX

The obvious difference is that the NSX pump runs at two speeds. Both share pin A7 as the ecu controlled ground for the relay. If I remember correctly, A8 is the reverse lockout control ground on the Legend, so whatever the AEM does on A8 shouldn't be keeping the fuel pump running on the Legend application.

sr5guy · 07-17-07, 01:42 AM

Christian, if you are taking the car to the track, it is a serious safety issue. For safety's (and simplicity's) sake, simply run an inertia switch in the B+ or ground wire going to the fuel pump. They are used on almost every Ford, Lincoln or Mercury product ever made and located in the trunk. A salvage yard shouldn't charge more than a few dollars for it. It looks and functions somewhat like a circuit breaker (with a yellow reset button). If the car should be jarred significantly, or in an accident the inertia switch will cut all power to the pump. Just make sure it is oriented and installed properly to the frame of the car.

-Matt

Dv8 · 07-17-07, 02:37 AM

A8
Legend:
Cooling fan control unit Type I(DRAD)/ Reverse lockout on 6spd models(MTSL)

NSX:
FLR2 (Fuel Pump Relay 2)

Looks like its getting two power sources. I figure all I need to do is disconnect A8 and it should work like normal. I'll try.

~Dv8

Dv8 · 07-17-07, 02:41 AM

Quote:

Originally Posted by sr5guy

Christian, if you are taking the car to the track, it is a serious safety issue. For safety's (and simplicity's) sake, simply run an inertia switch in the B+ or ground wire going to the fuel pump. They are used on almost every Ford, Lincoln or Mercury product ever made and located in the trunk. A salvage yard shouldn't charge more than a few dollars for it. It looks and functions somewhat like a circuit breaker (with a yellow reset button). If the car should be jarred significantly, or in an accident the inertia switch will cut all power to the pump. Just make sure it is oriented and installed properly to the frame of the car.

-Matt

NHRA rules had me install a kill switch on the back bumper 4 years ago. Cant see it but is there next to the license plate. It may not be inertia but it does the job of cutting pump power.

Chris, yes if the motor stalls the pump keeps going.

~Dv8

GreekPower · 10-30-07, 01:48 PM

Can anyone get a list of extra sensors needed if any to make this work? Or even a wiring diagram. DIY?

sr5guy · 10-30-07, 04:18 PM

Quote:

Originally Posted by GreekPower

Can anyone get a list of extra sensors needed if any to make this work? Or even a wiring diagram. DIY?

Its pretty much plug and play with some minor electrical modifications. The diagrams for the Legend modifications should come with the new AEM EMS. You should consider some vitamin supplements for brain health

GreekPower · 10-31-07, 12:25 AM

well being the only ems I ever bought was for a nsx and a 3000gt it was plug n play using the harness. As for my question, sorry I just didnt read alot. And granted I will be buying used it wont have LEGEND wiring diagrams if any. So I dont know which wires to change pins etc. Sorry that I never played with a legend ecu before.

Dv8 · 10-31-07, 10:57 AM

Quote:

Originally Posted by GreekPower

Sorry

How sorry you really are.....J/K

~Dv8

emaculate94GS · 10-31-07, 09:23 PM

DV8, thanks again for this break through. I may be in the market for one in the near future so there may be a chance I will PM you for some tips.

If anyone comes across one of these units at a reasonable price please get at me.

Kho · 09-27-08, 01:55 AM

Christian,
This may be way after the fact, but moving pin A7 over to pin A8 will fix your fuel pump problem.
Do you have the schematic for the Legend's pin A8? You mentioned that it's a cooling fan.
Send me that page and I'll make sure it works too.

reboticon · 09-27-08, 02:37 AM

Quote:

Originally Posted by Kho

Christian,
This may be way after the fact, but moving pin A7 over to pin A8 will fix your fuel pump problem.
Do you have the schematic for the Legend's pin A8? You mentioned that it's a cooling fan.
Send me that page and I'll make sure it works too.

You should be careful, friend.

If you keep on showing expertise in a wide range of areas, I will have to start trying to parasitcally absorbing your knowledge..