Um, I'll call you on that one.

James

 

I called you but you did'nt answer ahhaaha

 

You might get better answers on hptuners forums, call me and we can talk alittle. lateroooo

 

My second tune from, Allen he had 36* total.......Then when winter hit, the truck would detonate and my fix was to put colder plugs in. Sometimes it still would det., but then I had him take some out.

James

 

how do you determine?? cause of his setup??compression?? my nitrous tune has 26/27* and my motor tune is at 33.5*? and just by the SOTP feel it felt alot better? we had it up to 37* at one point while tuning it and it would take it without any issues, but it seem to scare us having that high so we cut it back..

not arguing with you but I am just wanting to learn more about all this asswell?

James, replacing your stock fuel pump is always a good mod anyway,

 

I have tuned several setups, and there is a point where you may not be getting KR, but its just additional heat running timing that high. I have seen the same things on some trucks too, but more timing without detination doesn't always mean more power. Generally the more efficient the cylinder head the less timing you will need to run. Of course every setup is different. One example: I have a friend with a 2001 WS6, full bolt-ons, auto, stock stall dynoed 345 RWHP and the car didn't like over 24-26* of timing. I have done some stalled setups that were similar and they liked a few more degrees. I have done some cammed setups that will take more timing, Tan327's old 5.3 with the 226/226 was at 31* without KR before we backed it down to 29*. You really need to put it on a dyno to find exactly what is makes its most power with. 33* and 36* figures sound very high to me though.

What cc chambers are the edelbrocks, and what is your CR? Also take into account that the knock sensors may have been desensitized, so it may be less prone to show KR, even if it was occuring.

 

now it makes alittle bit more sense, but it is true if you put it on a dyno you'll see there if there is a difference form certain * to the other *.....

 

on the dyno i never seen a gain past 28 degrees

 

also its you pump thats being maxed out

 

True, and I will admit I do way more LS1's than I do 5.3's, but my findings tell me that they are very similar as far as spark advance, maybe get away with a little more on the trucks because of the lower compression generally speaking.