I was wondering about my timing under boost- When starting boost I am at 23-24 degrees and then pulls back to 13 degrees at max kpa and rpm. I have the STS kit and am running the Tec3r. Low boost is 5 1/2 and high is at 7 1/2. Does this sound right????

 

depents on kr are you seeing any?

 

What you need to do is tune your timing for the high boost. As I recall, I ran around 13-14* on 7psi before I started seeing KR in the summer time. That will change if you add an intercooler or meth injection.

Who did your tune?

 

Mile High Performance in Denver. I am running a big air to air intercooler and water/meth injection.

 

Is timing with f/i like timing with n/a whereas you want as much as possible before knocking? Mine runs solid at 22 degree's w/o KR engaging. 25 degree's sets off my knock sensors even with meth injection. But 22 is right on. So, would bouncing back to 13 be more or less power than 22 degrees? I'd think Avsfan would be better off at 22 degree's WOT timing under full boost if he doesn't knock. Especially with i/c AND meth.

 

I run 11 PSI boost on my 5.3L with meth injection. My timing is around 21 degrees with IAT's 80-90 with no KR. We have not got timing high enough yet to hit KR with meth injection on the S/C up top. I will say that we are not pulling timing that I can see with either IAT or KR while watching HP Tuners. I do not run an intercooler with my Vortech S/C so the IAT drop is noticible when spray hits at 3 PSI (127 drops to 80) I am running a 625ml nozzle to achieve this. If I drop to the 375ml nozzle on the meth I start to hear detonation from 5200 rpm on out. I would suggest finding out what is pulling timing in your tune. My .02.

 

For SC, yah you want as much timing as possible without KR. For turbo, you want as much boost as possible without kr. Really two sides of the same coin -- in SC boost level is thought of as more "fixed" (or possibly maxed easier) so timing is what you change to make more power. For a turbo, more power is made easier by turning the little **** or pressing the little button, so a lot of folks take a 'set it and forget it' approach to timing and simply crank up the boost until they see KR.

it would be very interesting to see the difference between say 5* of timing and 1 psi of boost.

The answer depends. Since you effectively add your displacement to your displacement for each atmosphere of boost you add (so at 1 atmosphere, you double your cubes, at 2 you triple, 3 quadriples, etc.) If dropping to 13* of timing gets you to 15 psi when 22* of timing restricts you to 7psi, then I think you're getting more power from the boost then the timing.

That said, with intercooler and meth, you should be able to run more timing than 13* at 7.5psi. It maybe false knock pulling your timing or it maybe that the table is a little low. I generally run 14-16* at WOT, but admit I set it and forgot it

Check your "normal" full boost IAT and the IAT vs. Timing table to see if its pulling huge amounts (as the stock table does -- most change that when tuning for FI).

 

avsfan is running a standalone Tec 3r unit so it's all software programmable. He just needs to get in there and put some of that timing back I think.

 

Sounds like I need to get back to the dyno and check this out!!

 

fever-
Can you adjust this with the smt6? All of this is new to me so once I get my truck back I'm coming your way for a good dyno tune. I never got a response from imsmetals so I'm looking elsewhere now.