pcmhacking.net

Hey guys.
Thought I would post up a copy of my first attempt at tuning so far to get some feedback.
Got Dylan to make me up a tune to start with, and Ive been working from that.

Its $12P 1.12, Holden 304 V8 with VN heads, banana manifold etc. All standard VN EFI stuff. Bosch 0 280 150 960 Injectors.
Turbo 700 Auto
Engine is completely brand new/reconditioned. All standard 304, plus flat top pistons (Approx 10:1 compression?) and a mild cam (Crow 4631).

I found it was running very rich everywhere to start with. So modified the Kinjflow value based off what the Kinjflow calculator (excel spreadsheet) i found on here told me, plus the "fudge factor" as advised in the guide in the FAQ.
Then went to work on the main VE table. At first I started modifying and made it very messy/uneven. Ive since smoothed it out by manually changing values in cells and it has made a big improvement. I think Ive got it all pretty well in the ball park now.
Haven't touched the spark tables yet.

2 problems I'm having:
-It floods when starting from warm/hot. I have taken alot out of the Map A: Crank - First and second stage BPW vs coolant temp tables. I think it has improved slightly. It still floods when hot starting.
The values in the crank BPW tables are still a couple of mS higher than the BPW when the engine is running/idleing.
Should i use the idle pulse width as a reference and take even more from the crank tables, or am I overlooking something?
Ive taken so much out already im worried its something else causing it.

-It gets rich under deceleration, unless the deceleration fuel cut off comes in. Only heavy deceleration, ie 20KPA collumn. And it seems intermittent/not always the same. I took some VE out of the closed throttle VE vs RPM table. Do I need to take more from here, more from the main VE table, more from both, or change some other value?

Ive attached the BIN and a Log. You can see it flooding right at the start of the log when i go to start it up. Then having to clear the flood with wide open throttle.

Thanks in advance

What injectors are you running again? Are they tha standard ones? closedthrottle VE table is only active if the flag is set. More so used for heavily worked engines you shouldn't need it. I'll have a look at the log kater can't wait.

What fuel pressure are you running?

With the rich start up there's also a post start enrichment table. Are you only adjusting the VE table from wideband readings from a warm engine?

Goodwork on the tuning though it's good fun isn't it?

From memory that was set for stock injectors cranking should be pretty right.

is it flooding while cranking or is the spluttering for a bit after starting ?

Done a bit of a touch up here for you. Get a log and post the results cant wait for the next log.
Good to see you having a crack yourself though. I'm wondering if the fuel pressure is higher than factory?

Once the fuel is spot on we can play with some different timing see how it responds. Have you set the base idle to 10deg advance in diagnostic mode?

Open up your throttle blade a little bit. That will get the idle steps down a bit and will help with cranking as well a little.
Is the wideband reading correct in tuner pro?
Is the road speed reading correct?

Road speed not as critical just wanted to check the MAP reading at 100.
I think I read you're running the Spartan 2? Should be able to calibrate with the start up sequencer if you haven't already.

It floods while cranking, won't even fire unless I give it WOT after a second.

I believe the fuel pressure is standard, however I haven't actually checked it. I probably should do that.

How many idle steps should I be aiming for?

Wideband is a spartan 2. I've taken the pull up resistor out of the 808 and it reads 13.3 and 16.6 on ignition on so I believe it's calibrated correctly.

Road speed is not reading correct at the moment. Still can't get the jaycar corrector module to recognise the signal, so I've just bypassed it for now. I think I'll bin the jaycar module and buy a decent one.

That's all good on the wideband. I think that injector part number is stock VN?
Just strange with the injector rate lowered and VE being low as well. And the cranking being so rich.
When you open the throttle over 75% while cranking it reduces the cranking fuel quite a bit. So since that helps it definetely needs lowering. Have a play with the second stage cranking bpw table in this latest tune and see how it goes.
Try it as it is first. Is it like that hot and cold?

Aim for a warm idle of around 10 to 20 IAC steps.
And also check your base timing it's not exactly lacking timing as it is. But once fuel is right we can play with that.

When I done a compare with a stock bin there was a heap of undefined item's.
I might do another bin with your changes that's usually a sign of a corrupt bin.
Also the temp sender table (cant rember the name) had all weird values in it.

Is it possible all the undefined items are because your comparing a complete BIN with my BIN which is cal section only? (If I'm correct)

I see the temp items you mean.

Charge Temp - Inverse temperature term vs charge temperature term values are way different to the standard 12P bin.

Im going to copy the standard values back into that table and see what happens

Nah the lower asc or something it's called. Leave thd charge temp for now.
I thought it was whole bin? Upload a full one if not.