foxsl

iTrader: (1)

For my 2005 lq4 swap (from a van so cable throttle body ) my wiring guy is putting a basemap on my 2005 dbc pcm. People are saying the lq4 timing maps are very mild. I am wondering if it would be safe to have an 01-02 ls1 basemap as the camshafts are identical. I realize the ls1 has 28 lb injectors and the lq4 currently has its stock 25 lb injectors and also the ls1 is 5.7 instead of 6.0 He is using HP tuners but doesn't have the pro license.

The 6.0 is fully stock with the stock truck exhaust manifolds, truck maf, cone filter in the fender. Has an x-pipe, catless 2.5" dual exhaust.

Are the ls1 timing curves way too aggressive? I Just want to max out the ecm tuning for this setup as is on 91 ethanol free octane or 94 octane with 10% ethanol blend. A few years down the road I will change everything to accommodate a turbo but for now I am just looking for a good way to get that 300hp stock van 6.0 spec to the popularly claimed 360hp+ after just ecm tuning (emissions delete, trq management etc).

gagliano7

The reason they are lower in the trucks is the weight and the fact they are hade to run on 87 octane. I used a 2004 Z06 timing tables on my 5.3 in my 1992 2wd chevy pickup. I also run 93 in it all the time.

foxsl

iTrader: (1)

So everything worked out because they both use an 85mm maf right?
I think the truck injectors are 25lb, did you tune the map extensively or just use that ls6 basemap unchanged?

Thanks

gagliano7

Your injectors won't have any effect on the timing. I used the ls6 map then i logged and checked for spark knock. I didn't have any. I have made some changes here and there but the map is mostly the LS6 map.

foxsl

iTrader: (1)

I meant if there would be an issue if the map is for 28lb injectors and you use 24.7 or 25lb injectors(lq4), not ignition timing. I'm surprised it worked out so well considering the cam is a bit different but that is good to know.

mrvedit

There are separate tables for the injectors and you need all the injector data/details to get them right. When they are right, they will have no effect on others parts of the tune, certainly not the Timing tables.
If you change injectors and then the cars run rich or lean or doesn't idle well, that is a clear indicator you don't have the injector tables correct.

The MAF also has little (if any) effect on the ignition timing tables. Cylinder heads and cam will have the biggest effect followed by intake manifold and exhaust. And of course the octane rating of the gas. Adders (turbo, super, nitrous) generally require reducing the amount of ignition advance.

As others point out, you can generally add 4+ degrees to the high throttle ignition table values if you know you will be running good gas.

gagliano7

You want to have all your injector data correct before you do anything else.