Carby ecotec

General Tuning Questions And Discussions
User avatar
hsv08
Posts: 547
Joined: Thu May 09, 2013 6:50 pm
cars: (EX) VT SENATOR 355 STROKER
(EX) VT SS 304 MANUAL
NOW VX V6 HACK

Carby ecotec

Post by 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
Posts: 3416
Joined: Thu Apr 09, 2009 12:31 pm
cars: VH, VN, VS, VX

Re: Carby ecotec

Post by immortality »

Wouldn't it be easier with a 808 ecu?
User avatar
hsv08
Posts: 547
Joined: Thu May 09, 2013 6:50 pm
cars: (EX) VT SENATOR 355 STROKER
(EX) VT SS 304 MANUAL
NOW VX V6 HACK

Re: Carby ecotec

Post by 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
User avatar
vlad01
Posts: 7780
Joined: Mon Oct 08, 2012 6:41 pm
cars: VP I S
VP I executive
VP II executive
VP II executive #2
VR II executive
Location: Kyneton, Vic

Re: Carby ecotec

Post by vlad01 »

you can always change the spark as needed. Anyway, BLCD has very lame timing anyway, probably not enough for a cam'd ecotec.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.
User avatar
hsv08
Posts: 547
Joined: Thu May 09, 2013 6:50 pm
cars: (EX) VT SENATOR 355 STROKER
(EX) VT SS 304 MANUAL
NOW VX V6 HACK

Re: Carby ecotec

Post by hsv08 »

vlad01 wrote: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
Posts: 464
Joined: Thu May 03, 2012 10:50 pm
cars: HZ One Tonner
VE Ute
Location: Castlemaine, Vic

Re: Carby ecotec

Post by pman92 »

Why not use an 808, use a map sensor and get a 3d table?
VR-VY Holden BCM Simulator: View Post
MrModule.com.au
User avatar
The1
Posts: 4694
Joined: Mon Jan 04, 2010 10:23 am

Re: Carby ecotec

Post by 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
maf.JPG (36.02 KiB) Viewed 4122 times
User avatar
hsv08
Posts: 547
Joined: Thu May 09, 2013 6:50 pm
cars: (EX) VT SENATOR 355 STROKER
(EX) VT SS 304 MANUAL
NOW VX V6 HACK

Re: Carby ecotec

Post by hsv08 »

pman92 wrote: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.
User avatar
hsv08
Posts: 547
Joined: Thu May 09, 2013 6:50 pm
cars: (EX) VT SENATOR 355 STROKER
(EX) VT SS 304 MANUAL
NOW VX V6 HACK

Re: Carby ecotec

Post by hsv08 »

The1 wrote: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?
User avatar
The1
Posts: 4694
Joined: Mon Jan 04, 2010 10:23 am

Re: Carby ecotec

Post by 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.
Post Reply