Raptor and Henderson Performance

[Tyler Townsley]

Originally Posted by RHanselman

Car is still on the Dyno however they haven't ran it for a few weeks. The software guys are trying to improve on the way the secondaries sequence in. They don't like the way GM did it... I guess it will take a firmware change from what I'm hearing. So now it's in the software engineers court.

Cheers,
Ron

Probably do not like the way GM (adjusts) half's the primary injector flow and turns on the secondary injectors at that rate then applies the fuel table from there. Recommend they just make adjustments that turns on both injectors all the time as does Tod P in his modification of GMs code.

Tyler

[XfireZ51]

Originally Posted by Tyler Townsley

Probably do not like the way GM (adjusts) half's the primary injector flow and turns on the secondary injectors at that rate then applies the fuel table from there. Recommend they just make adjustments that turns on both injectors all the time as does Tod P in his modification of GMs code.

Tyler

Tyler,

R U saying Todd runs both injectors even at Closed Throttle? Stock code allows both injector ON after what is defined Closed Throttle in the cal. What would be the benefit of running both injectors, at half value, for idle?

[Tyler Townsley]

Originally Posted by XfireZ51

Tyler,

R U saying Todd runs both injectors even at Closed Throttle? Stock code allows both injector ON after what is defined Closed Throttle in the cal. What would be the benefit of running both injectors, at half value, for idle?

The stock calibration does not turn the secondary injectors unless it meets the parameters to go to the PE mode, I think it cuts the time to .57 of what is commanded when in single injector mode. You can also use this parameter to increase fuel if your PE table runs out of fuel. I recommended this to Jim Smith for that on Ron Ks car as he was leaning out on the dyno and would not respond to additional fuel increases in the PE table. It worked but he did have to go back to the PE table and pull some fuel out at top end.

My car calibration runs both injectors at all times. Throttle plates are removed. With the code mod you cannot jump back and forth. It does not matter whether you run one or 2 injectors you adjust the calibration in the code to meter whatever fuel is necessary, WOT or idle.

Tyler

[XfireZ51]

Originally Posted by Tyler Townsley

Car calibration runs both injectors at all times. Throttle plates are removed. With the code mod you cannot jump back and forth. It does not matter whether you run one or 2 injectors you adjust the calibration in the code to meter whatever fuel is necessary, WOT or idle.

Tyler

By "code mod" do you mean changes in the calibration values or modification to the ECM code. My motor has throttle plates removed, however at Closed Throttle, only the primary injector functions using VE Closed Throttle table.
I just want to understand what would be the benefit of running both injectors at Closed Throttle.

[Tyler Townsley]

Originally Posted by XfireZ51

By "code mod" do you mean changes in the calibration values or modification to the ECM code. My motor has throttle plates removed, however at Closed Throttle, only the primary injector functions using VE Closed Throttle table.
I just want to understand what would be the benefit of running both injectors at Closed Throttle.

Modification in the ECM code. If you do not do this mod you only run on both injectors in PE mode.

[tpepmeie]

Originally Posted by Tyler Townsley

Modification in the ECM code. If you do not do this mod you only run on both injectors in PE mode.

Don't want to hijack Ron's fantastic thread, but just to clarify... the table in the stock calibration, if set to zeros, will open the SPT's with a throttle position greater than but not equal to zero. To open them at zero, it is a very simple one byte change to the instruction set in the operating code.

It's not necessary to open them at idle, but if you choose to do it that's how.

[XfireZ51]

Originally Posted by tpepmeie

Don't want to hijack Ron's fantastic thread, but just to clarify... the table in the stock calibration, if set to zeros, will open the SPT's with a throttle position greater than but not equal to zero. To open them at zero, it is a very simple one byte change to the instruction set in the operating code.

It's not necessary to open them at idle, but if you choose to do it that's how.

Todd,

Couldn't you do that by what you define as Closed Throttle in the constants?
Also, wouldn't the pulse width need to be pretty small if using both injectors at idle?