Tuning after heads and cam install

[minytrker]

Me and a friend did heads, cam, headers, blackwing and z06 mufflers in his 99 frc. Here are the before and after dyno pulls. He bought everything used and was told he should do around 420rwhp. We cam up pretty short. The cam is a comp cam .584 .595 232/232, with LSA of 113, heads are 5.3 heads ported and polished, slp headers, and h-pipe with the blackwing air intake. The car is a 6 speed with 19 inch wheels. It was 314 rwhp/322wrtq before and now 385 rwhp/372rwtq with a/f 13.1. Do those number sound right or does the car have a lot left in it and just needs to be tuned more? Can better tuning make up 25-35 rwhp. The car runs and drives great, it just has alot lower hp than expected. Is there anything I can log to see if I am over looking anything? Or should I just flash it back to stock and start over and install a wideband. We were using the wideband on the dyno.

[Trippin]

Did you change the throttle body or injectors?

[minytrker]

Nope, didnt change either.

[johnsZ06]

I'm making 440/402 with a smaller cam. I'm thing stock LS1 injectors cannot support 420 HP. Also, how much timing are you running at WOT?

[minytrker]

28 at wot. 440 is pretty good for those mods and that cam. You also have better heads, pulley, better cold air intake, ls6 intake vs ls1 and better throttle body, so you should make more hp even with the smaller cam.

[joecar]

Nope, didnt change either. Log your injector duty cycles to see if you're hitting 100%.

Sounds like the car need tuning.

[ringram]

How are you guys with cams tuning the lower VE ranges given that overlap etc will cause erratic AFR.
Do you tune the higher areas up nice, then extrapolate the lower regions and smooth till it "feels" right, or is there some other special approach?

[ItzNota]

How are you guys with cams tuning the lower VE ranges given that overlap etc will cause erratic AFR.
Do you tune the higher areas up nice, then extrapolate the lower regions and smooth till it "feels" right, or is there some other special approach?

I love how interesting threads just die like this....

[joecar]

I love how interesting threads just die like this....I think what happens is people go away to experiment and/or read up, then they get busy at work, and then time goes by...
and the thread gets forgotten... :fluffy:

[mr.prick]

I love how interesting threads just die like this....

original post date is March 16th, 2006
how long should it "survive"?

[ringram]

Never actually got answered :)

You could probably re-enable MAF and calculate VE from MAF flow. But maf flow might not be right.
You could also alter fueling via VE on the dyno to get LBT.

But what the best way is Im not sure.

[macca_779]

What I do with big cams is just Auto VE them to get close to what the WB is reading. This of course doesn't mean it will run any good so I just move commanded around with the DVT's until its happy.