Carby ecotec

[hsv08]

Evening gents,

Got a guy that has a stock car that has a “stage 1” mace cam in it

Now he wants to go carb so is having the loom made up atm.

My job is to get the ecu running correctly and although I do MAF and GM flash based tuning,
doing a ecotec that’s no longer fuel injected is new to me.

So just to confirm, the maf is being tossed away and all injected associated wiring
We are going to go with a VS pcm and custom loom.

Tune wise I’m hoping with the maf disconnected it will always read 0 mgc
Therefore I should be left with a 2d table of just rpm
(I’m hoping it doesn’t get thrown into limp mode and run on a backup table)

What else should I be worried about?

TIA

[immortality]

Wouldn't it be easier with a 808 ecu?

[hsv08]

I did want to go that way but then remembered that the ignition timing on a stock 808 was far to much for an ecotec let alone with cam.

I’m not sure what’s best to go with. I though atleast with ecotec the tune can stay somewhat the same but remain 2d timing just like an old distributor type setup

[vlad01]

you can always change the spark as needed. Anyway, BLCD has very lame timing anyway, probably not enough for a cam'd ecotec.

[hsv08]

you can always change the spark as needed. Anyway, BLCD has very lame timing anyway, probably not enough for a cam'd ecotec.

Ok cool, and the ignition timing should track the 0mgc colomn and not go into a backup timing mode with maf disconnected?

Edit: just relised blcd is 12p

[pman92]

Why not use an 808, use a map sensor and get a 3d table?

[The1]

without the maf it'l still run, it will use the Default table to simulate MAF G/S and then generate Cylair as well. So you can change the values in there to help tune it a bit.

Default Airflow Vs RPM & TPS %

maf.JPG

[hsv08]

Why not use an 808, use a map sensor and get a 3d table?

I just found out the guy whom I am doing it for has already paid for the loom
Setup. So can’t really chnage to an 808 now.

Although I really wish I could.

[hsv08]

without the maf it'l still run, it will use the Default table to simulate MAF G/S and then generate Cylair as well. So you can change the values in there to help tune it a bit.

Default Airflow Vs RPM & TPS %

maf.JPG

Thanks the1

So by looking at that table I can change whatever I blocks I need to them I’ll have some idea where the timing may be

Ie anything over 4000rpm and 50% tps will be using the timing in the 52-70g/cyl on the low octane timing map?

So I’ll still kind of have 3D timing?

[The1]

i think over 4800rpm will use the 4800rpm value and over 50% tps will use the last value read from that MAF table which will peg the cylair to a value. It will still all be 3d as per normal.