Transient fuelling????

[hquick]

The injector flow rate is a flat line because everything I've read says for manifold ref'd...it should be. If not...please tell me how I should set it up?
As for the PE...yeah..trying to bring PE in early with as little delay as possible to counter those lean spikes.
What would you recommend?

[Delco]

I can see why the maf wouldnt have the issue given the setup , there is such a long intake tract from when the air moves past the maf to when it enters the engine I would expect there to be a rich transition rather than a lean one.

I would setup try using PE mode to enter early based on manifold vacuum not rellying on B3647 which is in a low priority part of the code , have a slope in the fuel flow to account for the transition - yes in the trucks GM did it wrong but different calibrators do things differently , I know when I use to be a OEM calibrator we all had to follow different criteria setout depending on if we were doing it for GM ,Jaguar or Ford , look at how injector flow is done in the supercharged cars.

[hquick]

Thanks for the advice...I'll try the injector slope and see how it goes.
Willing to try anything. Lol!
Can you please clarify this?

I would setup try using PE mode to enter early based on manifold vacuum not rellying on B3647

[dc_justin]

Here's the radix supercharger:

Thanks for the advice...I'll try the injector slope and see how it goes.
Willing to try anything. Lol!
Can you please clarify this?


Quote:
I would setup try using PE mode to enter early based on manifold vacuum not rellying on B3647

Howard,

He's suggesting to have your PE enablers setup so that your PE Map threshold is the deciding factor on when PE kicks in. Lower TPS enablers and rely on PE Map.

[hquick]

Map at 85 and TPS is 35...isn't that what I've done?
So does this make sense for the IFR table? 43.5, 42lbs at 58psi.

6.109375
6.148438
6.187500
6.226563
6.257813
6.296875
6.335938
6.375000
6.406250
6.445313
6.484375
6.515625
6.554688
6.585938
6.625000
6.656250
6.695313

[Whippled 496]

Map at 85 and TPS is 35...isn't that what I've done?
So does this make sense for the IFR table? 43.5, 42lbs at 58psi.

6.109375
6.148438
6.187500
6.226563
6.257813
6.296875
6.335938
6.375000
6.406250
6.445313
6.484375
6.515625
6.554688
6.585938
6.625000
6.656250
6.695313

I dont think sloping the table is the solution Howard. Its the wall wetter/transient tables we need. I cant really go back to MAF as i am maxing it out at WOT.

[Delco]

Set B3644 to 1

[hquick]

Thanks....will do.
Does that IFR table look OK?
I'm using the Bosch 42lb greentop injectors.

[hquick]

This log and tune as per your suggestions Delco.
I don't see a change in the lean spike?
Wouldn't transition to PE be quicker with B3644 set to '0' rather than '1'?
Any thoughts...idea's?

[Delco]

See how it lean at 70kp all the time , look at frame 7943 , and the map of the log , the point where you start to have the problem is always lean.

Once it is lean on the transition you will get a partial misfire and that makes it leaner.

Your VE table looks very wierd , then again we dont tune old 350 chevs , would normally never see the big dip at 2500 like you jave.

What happens if you open the throttle at 4000 rpm