MegaSquirt 2 Tune

I’m in a difficult situation where I live in an area where only a very small pool of people will even consider helping tune my car. Mainly because I run an megasquirt 2 ECU. The fact is that no tuners are wiling to spend the time on it, most actually said bring it in and we’ll swap out your ECU. Now I’m of the mind set ‘if it ain’t broke don’t fix it’…

I have built the Ford Duratec 2.0ltr engine with a high lift cams, worked head, pocketed pistons and lightened crank. It has Jenvey 45s with staged injection running 200cc Bosch injectors on the head and 210cc Bosch injectors on the throttle bodies.

Now after the initial build I found one guy who was initially willing to help. He swore all though the tune at how he hated the ECU brand. But effectively what he did for me was 10-15 runs and sent me on my way with full throttle pulls on his dyno. At this time i was fairly happy as met the figures i was expecting. Although the torque curve was a bit wallowy.

The issue I’ve found is that on the road in most driving its struggles low down, considering the car is very light (560kg) it should I think do better.

I’ve attached a print of the dyno pull at full throttle, also a screen shot of the staged injection. Now its my understanding that the MS2 does not disengage the primary injectors when engaging the secondaries even at 100% so also attached a table of roughly my injectors capability at 100% efficiency (I understand these should be typically oversized). Now to add to my confusion the ignition table has a mid point drop, that makes little sense to me – I’ve considered its been purposefully put there for a bit of retardation if you lightly hoover on the throttle through a fast bend… shot of the ignition table attached. The more i look the wronger it feels!

To compound issues my fuel table reads upto 195 VE but my engine has no forced induction, I’m assuming this is to stretch the injectors to their max..

The aim of this is trying to make it more driveable, I get no real pull until both injectors reach 100% on the staged injection detailed below in CC;

This shows that you can see unless I’m at 95%tps and 5000rpm I’m not getting full injection capabilities and I believe that’s affecting my power and possibly underfueling me resulting in the engine running lean. Ive purchased some 440cc injectors (waiting on postage) to put on rail 1 and I will keep 210ccs on rail 2 to top up at high revs, but a little nervous about the change needed to the fuel table!

I have no dyno to check available to check, I have taken logs, reviewed them and ran VE analyse from the mega log viewer. Which made fuel cell changes prior to the shown below, which is interesting as its mainly where the cam comes in that its adding alot of fuel but reducing fuel prior. (On the table blue is richer red is leaner)

I've generated a new ignition table which feels a tiny bit more consistent and safer that the one im running on and the new VE map below with my injectors rails both running 100% other than when i lift from the throttle

Here is the new VE Table..

I've prattled on a bit above, pretty much sums up my learning so far, I need to find an affordable knocksensor. But I guess i'm looking for assurance that i'm on the right track. I still don't fully understand why my fuel table shows 100+VE on an NA engine. I dont want to plug a map in and go bang! :D It could be thats as good as the engine will give and the torque curve wont improve, but all online sources pretty much confirm my injectors are too small even when combined at 100% efficiency.

Thanks for any help or advice given - no matter how critical!

Do you have a wideband Lambda/O2 sensor fitted? Can you provide a log of a full and partial power RPM pull from 2000 to Redline in say 2nd or 3rd gear?

The forum won't let me attach an mlg file so i zipped them. There's two but they've been going through the mill on ve analyse.

Here's a snap shot, but i've made a change and switched both rails of injectors on through the staging. So its running through the autotune process and a bit of iteration. But to be honest ive been struggling with my RS232 cable dropping out which is a complete pain so keep losing complete logs. It is a bit rich still since switching on both rails but hopefully auto tune will bring that down.