Im having a bit of confusion on how to set up the SOI fuel timing and fuel pump. Ive been watching Gregs video and trying to understand this.
Here is the setup;
2018 Camaro
Prc heads, Headers, cat back, Msd Intake manifold, texas speed cam, Comp cam lock out, Lt4 fuel pump
Cam profile as follows;
duration at .50 Intake 235 Exhaust 239
lobe lift Intake .358 exhaust .358
valve lift @ 1.8 Intake .645 exhaust .635
lobe separation 116
intake center line 112
Fuel lobe 32%
Now Ive gone in and copied over all the axis and tables for the fuel pump. Tables include
:Fuel Pressure Tab
regulation pressure
Desired fuel pressure normal
High pressure desired base and catalyst heating
integral min and max
pressure limits max
hpfp maximum oring max
:Fuel pump Tab
min duty cycle
duty
Fuel flow temp corr
leading edge angle
peak duration
peak duration temp
?1. Do I add 32% more fuel on top of the changes to the leading edge angle? This would be due to the 32 % increase in the cam lobe that is advertised?
?2 Do I adjust the leading edge angle and get fuel rail pressure actual and desired to match?
Since the injectors are the same I did not want to manipulate the flow rate to compensate for this.
?3 Am I over killing the pump values and should just increase the the leading edge angle by 64% (32% cam and 32% pump)
I am a bit confused because LT4 engines are supercharged and converting the pump and scalers for the car. Car is not boosted but scalers are for boosted app.
?4 Does this close the gap on resolution of tuning for the vehicle?
In the video Greg talks about increasing values for pump by percentage but the car is supercharged already.
?5 Is the increase due to cam lobe or for the bigger LT4 pump?
SOI timing:
From what I gather from the change in cam the exhaust valve closes at 4 ATDC. This would allow me to adjust the SOI all the way to 356 degrees. would this be correct?
Not sure that I would want to do this and push it to 356. At Idle the car is around 315 degrees and wot is 335 from factory.
?6 Should I move the table closer to the 356 degrees or farther away due to valve opening?
This car has cam lock out and The cam advance has been deleted. Now the Map is way out in certain areas which need to be corrected I would assume. I was looking at the Lt4 map and I know there is no cam advance in the car. I was Thinking copy the LT4 SOI profile over and adjust from there.
?7 Would this make sense to start here?
?8 What am I logging for when adjusting for this?
?9 What am I looking for to get proper results?
At the moment the car is running on the fuel pump values that I have changed. I have not touched the SOI table yet. I have been working the vve table and do have the vehicle in forced in open loop. Im noticing the car will like to idle at 14.0(.96 Lambda) at this point. When I turn the trims on car STFT are -14 % and lambda goes to 1. Not sure on the math but it seems to over fuel itself to compensate back to stoich. I was wondering if the SOI has alot to do with this. The other side of this if I lean it out the car wants to stall. The richer mixture keeps the idle smoother and no stalling.
Thanks for any help that people can give.