LSX Power Tuning

iTrader: (2)

Never seen a 4.8, 5.3 or 6.0 like 29 degree's NA at the track or on my loaded dyno. Every combo is different but that is alot of timing IMO.

1FastBrick

iTrader: (17)

That's Funny because I was just having this discussion yesterday!

Another tuner, claimed he pushed a bone stock LQ4 with 31 degrees of timing on an Engine Dyno.

He Claimed to get 56 HP over stock out of it at 31 degrees with the fueling dialed in. In another sentence below that he says he might have gotten more but the Wide Band on the Dyno wasn't working right...


Although I am not a tuner by any means, I haven't seen many NA combos pushed past that 28-30 mark that lasted very long on pump gas.

GMCtrk

iTrader: (27)

My stock lq9 never liked more than 23-24 degrees. Once I cammed it I could give it 27-28 degrees.

once boosted always start conservative with timing and go from there. I see no reason to push timing to the ragged edge on a street vehicle.

George C....

Hell early ls1s being 97-98 took 31
My 5.3 in my jeep took 30* and showed power gain

Skeets old 6.0 that held the record for fastest NA 6.0 took 29*

4.8s take timing with having no compression and then adding a cam drops dcr

Another 6.0 i tuned made 480 with 29*
Various dynos used and different tracks to back up

Now newer motors dont take the timing....most ls3s take 26*

George C....

another example....my old 5.3 with a 230/236 cam....at 22* truck trapped 126 mph on 12.5 psi, kept upping timing and kept gaining mph....at 26* timing it trapped 130 mph
went to 27* and it was faster up to the 330 where clutch pedal broke
this was on 93 and meth

never pushed a drop of coolant, plugs looked good being br7ef...afr was 10.8-11.0 during run

so in the end you gotta read plugs to tell what is safe and what isnt...

lycominghunter

iTrader: (2)

Well good to know that something is off with that 2.08 60ft, so I think I know where to start. Suspension should be good, but I'm going to go back through and make sure the front and rear cycle freely (double nut the bolts). I can play with the single adjustable qa1's as well. Lastly, and I still think its off, will be the pinion angle. I shimmed it so that under acceleration, the pinion would rotate up to match the angle of the trans (trans is at -5 degrees, pinion was at +3, accounting for 2+ degrees of upward rotation under acceleration). But I'm going to set the pinion at -2 and see if that works out better.

I'm on 93 pump gas.

Definitely not jumping straight to 20 degrees, but will probably creep up to about 16 or 17. Yes, Ive been making sure the AFR is accurate before increasing the timing.

N/A, my truck ran a best of 14.39@96.5mph on 21 degrees (converter, 3.42s, stock exhaust manifolds, isky triple 12, e-fans, CAI). I increased the timing into the high 20's and never could pull off a better time - so kind of interesting.

Also, with regards to the M/T ET Streets, I've ran them anywhere from 20 to 14 psi. 20 psi didn't seem to hook very well but maybe that's because of the suspension issues.

So, definitely got to figure out the suspension so that I can leave under some boost and get at least down to 1.7 60fts. Id like to get some high 11's out of it on 9psi before increasing the boost.

Thanks for all of the help guys!! I really appreciate it.

GMCtrk

iTrader: (27)

Are you spinning off the line?

George C....

What is timing at 1.0 load?
What is timing at 1.1 load?
What afr at 2 psi?
What afr at 5 psi?

lycominghunter

iTrader: (2)

George, not sure what you mean about 1.0 and 1.1 load.

My AFR in boost is 11.5 commanded, but always stays between 11.4 and 11.7.

Are you suggesting to have transition AFR at 2 and 5 psi? Should AFR at 2psi be about 13.1, and at 5psi 12.3? (or something along those lines?)

lycominghunter

iTrader: (2)

Yes, even N/A I had trouble spinning off the line. The one good launch I had was leaving the line at 4psi, and cut a 1.96 60ft. Then the next pass was at 3.3psi and it broke traction.