0411 5.3 cam tuning.

[Playtoy_18]

Anybody have any tips for getting a base tune close before it goes in?
This will be a stock 2001 5.3 with .617/.624 lift,231/239 duration on 113 lsa.
Also has a 75mm TB,which I don't believe is stock. Zero emissions,manual trans for th400 with no VSS.
I know alot of it can be calculated to get it close,but best place to start?

I'm looking for stock TB size,from there I figure I will calculate the percentage increase over stock and scale the airflow tables accordingly?
I always referred back to my cam tuning thread and pm's from mondax,ed wright gave some excellent advice in there.

What's the best way to pencil whip this thing before we start it up so it's close?

[Playtoy_18]

This is the rough draft i'm working on for it,if somebody wants a .bin I can get one as well.
And from searching looks like the 75mm is stock for the 5.3,so just need some direction on the cam.

[Fast355]

This is the rough draft i'm working on for it,if somebody wants a .bin I can get one as well.
And from searching looks like the 75mm is stock for the 5.3,so just need some direction on the cam.

For starters I would add a vss to that TH400. Other than that, first thing to do is raise and flatten y our idle timing and slightly raise the idle speed. On my cammed L31, I adjusted the throttle body minimu air rate screw to bring the IAC down to factory specs.

[delcowizzid]

a lot of people are playing with end of injection settings in the fuel tables for good idle with cams to make up for the change in inlet valve opening times

[delcowizzid]

end of injection spreadsheet incase you need it.they are injecting fuel after the exhaust valve has closed on overlap camshafts to stop the fuel smell out the exhaust and gain torque and economy

[Fast355]

end of injection spreadsheet incase you need it.they are injecting fuel after the exhaust valve has closed on overlap camshafts to stop the fuel smell out the exhaust and gain torque and economy

I will have to check this out if its applicable to my L31 0411 application.

[Lextech]

End Of Injection Timing spreadsheet. They are injecting fuel after the exhaust valve has closed on overlap camshafts to stop the fuel smell out the exhaust and gain torque and economy.

Can you explain how to use this spreadsheet? It looks like a good tool and I don't know how to use it.

Jeff

[Playtoy_18]

For starters I would add a vss to that TH400. Other than that, first thing to do is raise and flatten y our idle timing and slightly raise the idle speed. On my cammed L31, I adjusted the throttle body minimu air rate screw to bring the IAC down to factory specs.

Idle RPM is around 525-550 at idle currently,going up as temp goes down.
Should I start around 200rpm higher idle across the board?

for idle spark,I need to adjust timing at idle via base spark advance vs load vs rpm (closed throttle In P/N and drive) right?
and again just blanket timing add in the lower cells <800 / <.48 gm/s .
Not the idle overspeed/underspeed spark advance correction vs rpm.

After starting need to adjust the screw till I get IAC reading within range? Sound correct?

Should I line out the idle before the VE/MAF?

Thanks delco,i'll check out end of injection timing as well.

[EagleMark]

For now just set idle to 800 in all idle tables.

Same for spark, all tables.

This will get you started and running easier then can figure out which table is working since there's no VSS and I don't know if there is a Park/Neutral wire?

If the IAC counts will be high until full warm up. But I would turn off key to adjust throttle blade. Then key on should set TPS to 0%. No need for it to think it's off idle after adjustment and put you in different tables.

It's nice to have some idle quality to warm up and be able to drive, then work on VE. This is all of course after things are calibrated for injectors and throttle body changes or?

[Playtoy_18]

I did run a P/N wire,it will be going to the BM shifter. Though i'm still not positive if I should run the P/N or cpp circuit since I'm programming as a manual.Currently it is pinned into P/N,and will only take a minute to swap the pin since they are right next to each other.


Could you elaborate a bit on same spark for all tables?
So reset all the MBT,hi/lo octane and base spark maps to a single constant? Makes sense to eliminate variables a bit.
What would you suggest? 25 or 30 across the board?