To better elaborate - high rpm - more pulsewidth - ealier soi... You still have to keep soi away from it's previous eoi... This is hard coded in the ecm, so your looking to push eoi back as far as you can at higher rpms... Again going back to the perfect raw to vaporized fuel ratio...
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
mid rpm areas - this is your typical highway speed cruising areas - your after economy as much as anything - you can actually lose 10mpg going too far back in the mid rpm area
Gears strung out - light throttle - revving high - goes back to too much raw fuel in the cylinder - rpm and velocity will make up for it some, but not entirely
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
Big bore motor with some overlap and an ect table tapering down to 80 at operating temp - this boundary would be OK / otherwise you might want to do what Higg's suggest and put boundary back around 510 or 520 at idle and lower rpms and keep the other numbers you've got...
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
Here is what I am thinking with a Zero'd RPM table and stock ECT table:
B.JPG
Initially I was thinking the same thing as scott28 but modified my thinking a little bit and advance injection like stock up top. I don't think 3000 is the same as 6000, BTW!
This graph retards idle injection vs stock to accommodate a bigger cam, it retards it even more at low-mid RPM for throttle response, and then advances it as you get higher RPMs/more pulsewidth to give more headroom to injectors.
Last edited by Higgs Boson; 02-12-2017 at 11:03 AM.
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
I do need more. Do you mean the middle of the intake valve lift for EOI? If so, then we agree on that.
Not sure what strung out lower gears means, etc.
Up to about 3000 RPM I am still targeting EOI at the middle of the intake valve lift and then advance as we move to 6500 RPMs. I suppose it really depends on the RPM range you like to get froggy, if there is a lot of part throttle transitions between 3500 and 6000 like on a road course, maybe leave EOI retarded up there, but for a street car that plays harder in the 2500-3000 range or is simply WOT, like a drag race, I do think advancing injection this way is beneficial, I really don't see even with a stock setup, emissions being a concern at 4000-6500 RPMs but simply efficient injection practice, which advanced would be.
Do you know the hardcoded limit for the delay between EOI and the subsequent SOI?
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
It was so many ms and Dave posted it a while back... Forgot the specific number?Do you know the hardcoded limit for the delay between EOI and the subsequent SOI?
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
Went back and looked at the spreadsheet more in detail - I really like the fact that you give actual soi numbers in relation to exhaust valve closing vs rpm numbers... Also compared your boundary to some of mine - honestly other than peak maybe being too high - also didn't look bad - for a stock cam your too retarded in the mid rpm areas and at peak, but for an overlap cam especially combined with a pd blower, you could actually be more retarded in the mid rpm areas... You should also notice better cold starting with that boundary for a really aggressive cam...
Is there a reason why you have two rpm cam visuals? Do the crosshairs open and close to represent soi and eoi like carsons?
I'm liking this more and more with the more time I spend looking at it
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
I will post back up with results after I test some different injection timings
Just to throw another method in the mix, think about a carburator. Is there fuel always sitting on the intake valve and air and fuel enter the chamber when the intake valve is open?
In fuel injection terms, this would mean SOI is the same as IVC and EOI is IVO (even though technically the "injector" is just always on).
With that said, moving from:
Carb to port injection means you don't have fuel in the intake manifold at all times and you can clean up idle and very low fueling by avoiding spraying during camshaft overlap. The method would be delayed injection where possible.
Port to direct allows injection to occur later, technically, and EOI up to just before spark and no fuel is sprayed until after the intake is already open (technically this is a drawback and limits headroom and power potential) because you can't spray before that as you either have combustion going on or the exhaust stroke going on. However, port injection cannot spray this late because it is not as atomized as a 2000 psi DI injector and you also cannot spray into the combustion chamber if the intake valve is closed. Therefore, DI allows a later spray than port.
So, is "Fueling Evolution" delaying EOI?
Hey here's a funny post from 2011 I just googled.....
http://ls1tech.com/forums/pcm-diagno...l#post14963722
Last edited by Higgs Boson; 02-12-2017 at 03:58 PM.
I've never looked at it "exactly" like that even though that's exactly how I do the most of my injection timing...
It's funny - a lot of the benefits I've even found with gen 5's is delaying soi until the cylinder pressure is higher or rather retarding the timing... Another way I'm getting fuel economy out of those beast... But don't change it much Higg's - you can pm for an exact number - you might be surprised how much difference a small number can make for idle and cruise economy...
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
I'm pretty good at the GenV stuff at this point especially since we can log SOI and EOI at the same time, it's easy to tell right where we are with it. It's just been a long time since I messed with injection timing on a GenIV motor, based on that link it looks like I was pretty opinionated in 2011 about it though, and guess what, I advocated delaying it, too!
Things got a little sidetracked, but post 54 Scottt28...
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
~Greg Huggins~
Remote Tuning Available at gh[email protected]
Mobile Tuning Available for North Georgia and WNC
It's going to take me a week to read all of this