85Iroc-Z

iTrader: (4)

I will be getting my car back on the road again within the next month and I am wondering what adjustments I need to make to be able to run with the blower. I am running an ebl p4. The car is a 383 tpi with a procharger D1SC that will be running around 10-12 lbs of boost. Has water meth kit too. I would like to make whatever adjustments are needed to safely start driving the car around and do the fine tuning to it. What should I do with the spark table, just retard the timing about 1 degree per lb. of boost? Do I touch the spark table at all when not in boost? What fueling changes need to be made in the tune? Is a wide band o2 necessary as well? Thanks for any help. The rest of the car is ready for the blower, it is just the tuning that I need help with.

RBob

iTrader: (1)

Install the 2-bar MAP sensor and set the option flag for it in the BIN. Remove the belt from the blower and tune the entire VE and SA tables. Need to be sure that the engine runs well when not in boost.

When in boost the 100 KPa columns of the VE and SA tables are used as a base. The fueling and SA is adjusted from there.

Now put the blower belt on and ease into some boost. Get a few psi and check for knock along with fueling. As these are adjusted go further into boost and adjust along the way.

Note that the "BST - Boost PW Multiplier % (2-Bar)" can add or remove from the current injector PW. Reducing the PW is sometimes required due to losses in the system.

RBob.

85Iroc-Z

iTrader: (4)

Thanks for the quick reply. I have done a lot of ve learns before the blower install so they should be pretty close. I just bought a 2 bar map for it as well that I will be installing.

Orr89RocZ

iTrader: (20)

1 deg per psi is good start.
Keep it on the rich side
Spark table is like normal na motor while not in boost

85Iroc-Z

iTrader: (4)

How do you "keep it on the rich side"? What gets adjusted to do that?

Orr89RocZ

iTrader: (20)

You just add more fuel lol get a wideband and shoot for 11.5 ish to 1 airfuel ratio. Normally na motors are around 12.8:1
Low amount of boost can run closer to 12's airfuel but check plugs for correct heat range and keep an eye on the knock sensor.

85Iroc-Z

iTrader: (4)

I know that you add fuel to make it rich, but how do I go about doing that? Do I adjust the ve tables? I'm just not sure where it gets adjusted. Thanks for the replies.

Orr89RocZ

iTrader: (20)

You will have to do some reading on how to tune. Right now you are getting over your head attempting a boosted car without knowing what exactly to change.

Yes ve tables, hopefully its 2 bar based map. Not sure how ebl works, else there is somesort of boost multiplier to the pulsewidth

85Iroc-Z

iTrader: (4)

It is a 2 bar MAP. I do read about doing tuning, a lot of different things along the way confuse me. There are no local places around me that do tuning so I am stuck trying it myself.

Street Lethal

iTrader: (16)

The VE tables are adjusted during the VE Learning, but you can set the air/fuel target that you want in Power Enrichment, for example 12.80 air/fuel is being commanded in the LB9 bin that I originally started with, and I lowered it just a tad because my engine flows very well even without the turbo. During boost though, the way you richen the air/fuel to keep it safe is exactly how RBob described it above, you adjust your BST - PW Multiplier tables based on the 100kpa column from your VE table, and increase/decrease the values in the BST tables to whatever you need to so you can maintain your desired air/fuel ratio throughout your RPM band...

86Z

iTrader: (4)

i could not tune my car with the blower belt off. it does not work, even when not in boost air is being fed to the motor.

just tune the car with the blower on. do not go in to boost get all the base done, then ease into some boost then so on.

Street Lethal

iTrader: (16)

What about disconnecting the supercharger's intake tube/silicone elbow from the throttle body, and letting the engine draw its' air right after the throttle body's orifice?

85Iroc-Z

iTrader: (4)

Thanks again for the replies. I will be trying this as soon as the weather gets better. How close could I get my ve tables while in boost, doing ve learns with a wide band?

RBob

iTrader: (1)

You don't, the VE tables stop at 100 KPa, basically barometric pressure. Please see post #2 in this thread.

RBob.

86Z

iTrader: (4)

nope, once you tune then reconnect the inlet you have some amount of air that will lean out the afr's

i actually figured this out troubleshooting an over rich condition i disconnected the supercharger for noise diagnosis

i originally tuned it with the charger on and working. just have to know how to use your foot

Orr89RocZ

iTrader: (20)

Yup i just leave everything connected and slowly work the tune. Blowers are easier with more linear predictable boost rates. Turbos are alittle tougher to crack