Hi Guys, I finally got to a point where I could try starting my car (FB with a S5 T2 engine) today and had some success, but also having some issues. I started with Aaron's settings, but I'm not sure I have everything input correctly.
I'm running: MS3/MS3X V1.1 firmware (the latest I believe) so a bunch of the settings differ from what his writeup has. This is all new territory to me, so before I go nuts trying this and that, can someone just look at my MSQ and make sure I have all the basic settings correct? Also, I started messing with the VE table and saw some improvement, but overall it's still difficult to start and spits and sputters etc. I can get it to idle around 1200rpm, but then all of a sudden it will again spit and sputter then die out...
I don't have a log at this point, but if someone could just confirm my basic settings at least I'd know they are ok
Thanks!
-Sean

 

Found I was setting my CAS incorrectly (had 10 in the "fixed advance field when setting it) once I corrected that it seemed to help a bit, but it is still very difficult to start and wants to cut out, and has a very rough idle... I reverted back to Aarons suggested settings for the tables which did not help...
Stupid question: on the VE table, making hte numbers larger would indicate more fuel correct? Aarons writeup says that much of the work done to get a idle etc is leaning those numbers out. So far the only mild success I've had is richening them...

I'm lost at this point.

 

for adjusting the starting settings ive been changing the cranking pulsewidth and also cranking timing advance. they seem to make a difference. mines almost started like 10 times but something just isnt quite there yet (maybe cause its a brand new motor idk)

 

I've got the starting advace at 5* right now. Anything higher wanted to kick back againt the starter. Then again that was before I set the cas to what I believe is the correct point. Might be worth trying a slightly higher advance. I haven't adjusted the starting pulsewidth though, worth a shot...

Hopfully someone will take a look at my file and tell me all the basic settings are ok, at least that would be one think off the checklist.

 

you can always try here too.

Megasquirt MSEXTRA / MS3EFI • Index page

 

Yeah I'll do that if I don't get any replies/can't figure it out in a few days. I've done some more reading and have a few things I'll try.

I'm assuming that since once it is running it is fairly smooth (fairly being the key word) that my wiring is correct and that it is reading all sensors correctly as well.

I currently have "10" in the req_fuel field, this does not match what the calculator gives me (I forget what that number was off the top of my head, but it was not 10) so I will change that to the calculated value and see what happens. I also believe that since I have to mess with the gas pedal on startup that it is getting too much fuel so i'll dial back the starting pulsewidthes a little and see what happens.

So far most of my changes have been to the VE table with mixed results. I'm thinking I should change the VE table back to Aaron's suggestions, leave it alone and change the things I mentioned above first...

The other thing I need to check is the BAC valve. I"m not sure if the one on there even works. If I remember correctly I have the BAC authority set to 0 so that it isn't getting in my way, but I'm thinking that might be a mistake since it is causing the engine to stall on warmup, making it difficult to do anything. I'll check everything else first before doing anything with the BAC though.

That's all I can think of at the moment, won't have time to do anything until tomorrow after work though...

 

I've always found that starting and idle work best between 5ATDC and 0deg.

Ken

 

Thanks Ken! I was speaking to a few other guys and they all suggested the same thing. I'll give that a shot.
Also, do you suggest using the req_fuel calculator, of should I just stick with the value of "10" that Aaron's writeup has? Or is 10 only good for ms1/2?
Thanks again.

 

That req_fuel value depends on your injector size in relation to your engine size. Most likely 10 should work, but if you have larger than normal injectors, it's going to make the VE table harder to tune.

I'd probably just use the calculator if I were you.

Ken

 

Ok I'm just running the stock 550 injectors on it. Hopefully I'll have some time to work on this tonight.