Bigwebb1978
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- May 30, 2010
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I need a recommendation to get the ECU remapped for a 350 magnum mpi...
Does Whipple still have access to all mefi codes to do a flash?
OR
I need a recommendation to get the ECU remapped for a 350 magnum mpi...
What changes have you done to the motor? Only an exhaust swap will not merit a tune on a SBC in my opinion.
There are several entities out there that can do it or you can get MEFI Burn and do it yourself. I use MEFI Burn myself.
So tested again this weekend and the motor was running rich and topped out at 4600 rpm.. After advancing the timing from 29 to 31 it picked up to 4800 rpm but still running rich and a little sluggish.. Not sure if it's a mapping issue from whipple or if I should keep advancing the timing??
So we can be on the same page we need more information.
What is the final motor configuration: displacement (cid), compression, cam specs, injector size, prop size (dia and pitch), drive ratio, approx weight of boat etc.
How did you know it was running rich? AFR? Smoke? Pulled plugs?
How did you advance the timing? Rotating the distributor or changing the ignition advance vs map vs rpm table?
I would be hesitant to make any suggestions without further information.
Like Trash says, if you have just been twisting the distributor the change the timing on an EFI setup this is really really bad practice. Yes it will accomplish the end result, but it skews the entire map, timing really needs to be adjusted inside the ECU in the tables.
If you are in Havasu i would get in contact with Brian Macy, he lives out there and has extensive MEFI experience....
If you are somewhere else in So Cal, call Alexi at BoostPower.
I talked to Edelbrock and they recommend starting the total timing at 34.
We do it daily[emoji106][emoji469]
I would kindly recommend you stop using that mechanic. Rotating the distributor to adjust timing on a Merc EFI motor is not what you want to do. In short, jumper the A/B pins on the DLC connector and set the base timing to 8 deg BTDC assuming that is what the tuner set in the ECU.
We have no idea what your stock tune started with nor where your current tune is, therein lies the problem. Without having wideband O2 and some on the water scanning you will likely be chasing gremlins for a while.
What year is the motor and what ECM does it have (MEFI 1, 2, 3 or 4).
Motor is 2001, not sure what ECM I have.
Going back to Dustin at whipple to see what I have now and go from there. Not touching anything until then.
I would kindly recommend you stop using that mechanic. Rotating the distributor to adjust timing on a Merc EFI motor is not what you want to do. In short, jumper the A/B pins on the DLC connector and set the base timing to 8 deg BTDC assuming that is what the tuner set in the ECU.
We have no idea what your stock tune started with nor where your current tune is, therein lies the problem. Without having wideband O2 and some on the water scanning you will likely be chasing gremlins for a while.
What year is the motor and what ECM does it have (MEFI 1, 2, 3 or 4).
The ECM is a MEFI 3, He jumpered the A/B pins and set the base timing to 8 degrees. I will be out there next week so I can get the numbers off the ecm and then call Dustin at whipple to confirm program and then go from there.
How much is a stock computer. Or try and borrow one and see if it runs better for now. What was top speed this last run?
I am pretty sure it's a timing issue, new computer is 1500$, no need it's good,it ran just under 60 at 4700 rpm, old motor ran 5200.. New cam and rev limit should be closer to 5500
I think it's a timing issue which is set in computer
Unless you're setting the timing with the ecu in base timing mode with a scan tool, you're really don't know where your timing is. The advance is programmed in the ecu so you can only set initial timing and then calculate where the total will end up.
If your mechanic turned the distributor because the plug looked rich..... find another mechanic.