I am just curious about how most have their cars tuned looking at my map. When moving VTEC down to 4000 (or any lower point for that matter) what are you doing with timing when you move the vtec point? Are you advancing it a little? Significantly? Assume you are at about 8-10 pounds of cooled boost (yes I know heat will vary based on the setup).

I have read conflicting things, but my map, which lowers the vtec point is still set to pull a couple degrees between 4000-6000 rpm on a piggyback setup (the "new vtec area")and it feels a little sluggish there.

My peak boost is supposed to be around 8 but I see a little higher than that sometimes based on temp. I thought the comptech or vortech setups felt that no timing pull was needed on their kits up to about 7 pounds. My SC puts out a little more heat than those but is aftercooled and the fuelling is good, low 12's under boost. I am assuming that I should not have to pull much timing with the aftercooled system and that level of boost but thought that some people were advancing timing a bit from a stock level when they moved VTEC.

Anyway....just kind of curious how most tuners are approaching timing in the moved vtec point with mild boost.

 

are you on pump gas or some sort of racegas/e85?

 

BP 93 octane

 

really need to put it on a dyno to set that up i think, your afr's seem a little lean for a pump gas also

 

Your timing retard should be based on pressure, and you should have some VTEC advance on a separate map so the two ideas are logically separated.

VTEC is 8 degrees or so more advanced from below VTEC, so I try to keep my full throttle timing curve smooth with VTEC set around 3.5k to 4k depending on the car (assuming no catalytic converter).

 

So if I understood what you said, where you tuned the new area under the curve for lowering VTEC you did advance the timing some, correct? I am pulling a few degrees everywhere, and I think there will some room to put something substantial back in when I get to the dyno next month.

 

Yes, timing can be added back in for the new VTEC area. How much is up to you to decide. I put enough in to make the timing curve smooth. This timing advance is what gives much of the gain in the new VTEC area. If a tuner simply moves VTEC to a lower point and adjusts AFR, you're only getting half a tune.