In need of a BASE MAP.

[E30_Beau]

RIGHT.. so i got myself a Megasquirt MSPNP2 for my E30 a bit over a month ago and I'm about a week away from pull it out and putting the stock one back in. I've been getting help trying to sort it out on the Megasquirt forum but the car bounces between turning over and not catching to starting and idling poorly (with a small amount of throttle input ) but stalling straight after i take my foot away. So I'm hoping posting on this forum might have some more specific advice for an E30 with a stroker 2.7 M20

Details of the engine are.
M20B27 bottom end (includes block, crank, rods, standard pistons
M20B23 731 cylinder head (port matched inlet, outlet )
Schrick 288/ 288 camshaft
M20B25 inlet manifold and throttle body
Bosch 0280155844 injectors (about 164 mm/min)
Removed AFM for inbuilt MAP

Do I need a altered base map to get this thing to at least idle so i can try and tune it? Or would really throw a spanner in the works?

[Jaxx_]

post a log

[E30_Beau]

How do i do that on this the forum, it says I can't upload a .mlg or .msq?

[Jaxx_]

google drive or ufile works

[E30_Beau]

https://drive.google.com/file/d/1Pn-...ew?usp=sharing

https://drive.google.com/file/d/1cMiJ2jGlX-8tuy-RxY7G56focgPz83kd/view?usp=sharing

[Jaxx_]

make public please

[E30_Beau]

should be good to view now.

[Jaxx_]

Are you sure your injectors are 164cc/min? that part number shows 21lb/hr and that's around 220cc/min.

It's hard to tune the car with it not up to temperature, it's best to bring the motor up to temperature however you can, then do a log. If it's impossible to run then it's another story.

Check your MAP hose to make sure it isn't leaking or pinched, your idle area is very high in the MAP table, which is probably a bit too high, even with your 288 cam. Are you sure you have the MAP sensor calibrated properly? Given the air pressure with the motor off I would suspect you are at or below sea level?

Until you get the car running well at idle, change the values in your Warmup Idle PWM(Startup/Idle -> Idle Warmup Duty/Steps) to this:



If the change helps but isn't enough, keep moving all the values up a few increments (use keys , or . in each box to move the values down/up). If the car idles too high, lower the values to where you want it to be.

Also, you don't seem to be logging an Air Fuel Ratio. Do you have a wideband O2 sensor? Ideally it should be hooked to megasquirt in order for it to be in the log file.

[McGyver]

Are you sure you have the MAP sensor calibrated properly? Given the air pressure with the motor off I would suspect you are at or below sea level?

But seriously, I hope I can get this level of help when I switch to MS2 and run into problems.

[E30_Beau]

Yeah so the injectors were one of the first problems i ran into, i looked at a few sites and all had different specs on them so i ended up getting onto Bosch to get the actual specs and thats what they got back to me with.
As for the wideband i have a spartan2 installed but i seem to be have ground issues with it, well the electrical ground from what i can tell, is there a good way to improve that or do i just have to find where the ecu is grounded?
And lastly i have double checked the vacuum hoses to the map sensor and they are all good (I am pretty much at sea level)

[Jaxx_]

If you have a graduated cylinder (or even a beaker) you can pull the rail and test an injector with megasquirt, just flow one and see if it's the right size... but have a fire extinguisher ready. Even if you go back to another ECU you need to be sure that you have the right values for your injectors. Something to think about if you don't want to send them off to get flowed. If your injectors are actually the 220cc/min you might be running very rich. Does the exhaust smell like gas? Do you have any black soot? How do your spark plugs look after the engine dies?

The spartan should have a green wire that is 0-5v output that needs to go to the megasquirt. There is also a black wire from the spartan that is your signal ground (which will be the way to correct most of your ground offset issue). Also see this article: https://www.14point7.com/blogs/news/...and-megasquirt

Right now it doesn't look like you have the green wire hooked up to the megasquirt. You should hook this up and have AFR values logged.

[E30_Beau]

So the car is running super rich, i've had to change the spark plugs because they were all covered in carbon ( less than 300km) and as soon as the car starts all you can smell is fuel, So i might see about checking the actual cc/min.

[Jaxx_]

https://www.youtube.com/watch?v=12jLWxwF4Xk

Here's a good example of injector test mode. Ideally it's not best to put the injectors on 100% duty, but I think for testing it is OK. Better to do 50% and 2x as long to find flow rate, although you will be a little short due to dead time. In any case, you'll find roughly where the injectors flow.

I would start by cutting 20-40% fuel from your fuel table and see if you can get the car to idle well. You won't want to drive without your wideband, but getting the car to idle well is the hardest part(besides starting)

[E30_Beau]

righto i'll have a look, just quickly tho where did you go for the cc/min specs for the injectors? i had another search and they are coming up anywhere between 200 and 150.2 ?

[Jaxx_]

https://www.injectorplanet.com/produ...sch-0280155844

from an ebay listing title:
Fuel Injector 19LB EV1 V6 XR6 0280155844 for Ford Falcon Fairmont Fairlane 4.0L


It might be worth just getting a metered container and flowing it yourself


edit: 150.2 g/min shown in the first link is mass, not volume (209.9cc/min flow is correct)
19lb/hr is approx 200cc/min