!afr!

[Boosted04Z06]

Hey guys, I am going to fire up my new motor:

LS6 Vortech supercharger at 6.5psi and I have a kenne belle boost a pump that I need to get set up, so I have a hand held tuner that allows me to read my air/fuel via my stock wideband 02 sensors...my plan is to monitor it while I break in the car, and I am wondering what I want my a/f ratio to be at idling, boosting..??

Thanks,


Dustin

[MikesZ06]

Duplicate thread..threads merged

[RocketSled]

Assuming you have the PCM program that goes with your Vortech supercharger, just put it all together and drive it. After a hundred miles or so, take a look at your LTFTs. If they're not within a range of about +/-5, you might benefit from some tweaking. But the LS6 PCM program is fairly complex, there's not a lot you could/should do without understanding what you're doing. Adjusting the fuel trims is fairly easy, though.

I have found the stock Vortech program to be pretty good, very drivable. I have only made a very few minor tweaks. I could squeeze a bit more power out, maybe, without adding more boost, but I haven't felt the need. The car makes more power than the 315s on the back can handle, they'll spin in 1st, 2nd, and 3rd. Maybe 4th, too, but I don't have the B*lls to go fast enough to find out...

The Boost-A-Pump is a good idea, though I went with a higher volume in-tank solution. The stock pump is only *just* barely up to the task. It's worth doing something about.

[Boosted04Z06]

Originally Posted by RocketSled

Assuming you have the PCM program that goes with your Vortech supercharger, just put it all together and drive it. After a hundred miles or so, take a look at your LTFTs. If they're not within a range of about +/-5, you might benefit from some tweaking. But the LS6 PCM program is fairly complex, there's not a lot you could/should do without understanding what you're doing. Adjusting the fuel trims is fairly easy, though.

I have found the stock Vortech program to be pretty good, very drivable. I have only made a very few minor tweaks. I could squeeze a bit more power out, maybe, without adding more boost, but I haven't felt the need. The car makes more power than the 315s on the back can handle, they'll spin in 1st, 2nd, and 3rd. Maybe 4th, too, but I don't have the B*lls to go fast enough to find out...

The Boost-A-Pump is a good idea, though I went with a higher volume in-tank solution. The stock pump is only *just* barely up to the task. It's worth doing something about.

Yeah, when I get a chance I am going to eliminate that boost a pump....but my problem is I turned the adjustment all the way down to lean, and I dont know where it was supposed to be, thats why I need to know what a good a/f reading is. I plan on turning it up to rich, and then driving the car with my genisis scanner, and monitor the a/f while I turn it down. Any recommendations?

Dustin

[jub jub]

You mentioned "stock O2 wideband sensors". You do know that your stock O2 sensors are narrow banded and only read accurately near stoich, or 14.7:1 AFR.

I'm not sure what AFR a boosted car should run at WOT but, at idle and cruise you should be stoich. I would take a guess and say around 12:1 at boost to be on the safe side. Again, like I said, I never tuned a FI car but I have tuned several NA cars and I run anywhere from 12:8 to 13:0 on them.

[Boosted04Z06]

Originally Posted by jub jub

You mentioned "stock O2 wideband sensors". You do know that your stock O2 sensors are narrow banded and only read accurately near stoich, or 14.7:1 AFR.

I'm not sure what AFR a boosted car should run at WOT but, at idle and cruise you should be stoich. I would take a guess and say around 12:1 at boost to be on the safe side. Again, like I said, I never tuned a FI car but I have tuned several NA cars and I run anywhere from 12:8 to 13:0 on them.

Thanks for the info! No, I didnt know that, I was under the impression they were wideband, shoot! I should just take it to a tuner...