$OD A/E Help

[Rally Smith]

I am trying to learn what I need to adjust to add more A/E to my truck. I'm running Tuner Pro RT. I was looking at the TPS% vs AE and MAP vs AE but those only have Msec to correct. Where would I need to look in order to add? I have been reading all over the place but yet to see what field to make these adjustments. Many thanks in advance.

R.S.

[BLG355]

I am trying to learn what I need to adjust to add more A/E to my truck. I'm running Tuner Pro RT. I was looking at the TPS% vs AE and MAP vs AE but those only have Msec to correct. Where would I need to look in order to add? I have been reading all over the place but yet to see what field to make these adjustments. Many thanks in advance.

R.S.

I've always adjusted TPS% VS AE. You can start by increasing all the values by 10-15% and see how that goes.

BLG

[PJG1173]

I hate tuning AE. always too much or not enough. just something you have to play with. I have found the multipliers vs temp make the biggest changes

[Rally Smith]

BLG, please help me understand how increasing the Msec adds more fuel? I'm not questioning you, I just want to have an idea on what I'm doing. To me it looks like it's just adding time the AE will be active.

Thanks,
RS

[BLG355]

BLG, please help me understand how increasing the Msec adds more fuel? I'm not questioning you, I just want to have an idea on what I'm doing. To me it looks like it's just adding time the AE will be active.

Thanks,
RS

I'm not 100% sure on this, as far as what it is actually effecting. I do know that a little bit goes a long way and it is easy to go past the sweet spot. Someone with a little more knowledge on it may chime in with a good answer.

BLG

[Rally Smith]

I am running headers with dual exhaust if that makes any difference...

[PJG1173]

BLG, please help me understand how increasing the Msec adds more fuel? I'm not questioning you, I just want to have an idea on what I'm doing. To me it looks like it's just adding time the AE will be active.

Thanks,
RS

The way I understand it is that Msec is added to the injector pulse width to compensate for fuel dropping out of suspension on manifold pressure changes. I use my wideband and the line graph monitor in tunerpro to adjust AE. I set the monitor to show my WBO2, TPS, map, and RPM. when I see a change in tps I look for how much it changed and when/if the AFR changed. in theory if AE is right you shouldn't see a change in AFR. if it is not right I look at when the AFR went too rich or lean. if the AFR spike coincides with the movement of the TPS then I adjust AE TPS. if the spike occurred just after the throttle movement I adjust MAP AE. as you can see below when the throttle changed (green) my AFR (red) went rich MSec's after the throttle opened so I adjusted MAP AE. this might not be the best way but it seems to work for me.

[Rally Smith]

PJG, thanks for the info. That helps me understand it a bit better.
I swear, tuning this thing has had to of cost me a mint in fuel from data logging.

[dave w]

PJG, thanks for the info. That helps me understand it a bit better.
I swear, tuning this thing has had to of cost me a mint in fuel from data logging.

It's a good thing you waited till this year to tune, last year the fuel prices were at least $1.00 more a gallon!

dave w

[PJG1173]

PJG, thanks for the info. That helps me understand it a bit better.
I swear, tuning this thing has had to of cost me a mint in fuel from data logging.

at least you didn't do what I did last week... imagine my surprise when I stopped at a red light with the windows open and caught a whiff of race fuel, then realized I had been driving around all morning data logging on renegade 110 fuel. after changing the fuel pump the night before I grabbed to gas cans closest to the garage door. apparently I need to label my gas cans better...

[Roadknee]

I am trying to learn what I need to adjust to add more A/E to my truck. I'm running Tuner Pro RT. I was looking at the TPS% vs AE and MAP vs AE but those only have Msec to correct. Where would I need to look in order to add? I have been reading all over the place but yet to see what field to make these adjustments. Many thanks in advance.

R.S.

What intake manifold are you running?

[Rally Smith]

What intake manifold are you running?

Stock.
everything on the LO5 is stock from 95 GMC K1500. Throttle Body Mods done and fuel pressure is at 14.25 or so. Changed in computer accordingly to correspond. Also, bumped up initial timing 2 deg. and made change in computer as well. If that makes any difference at all.

[BLG355]

Being a stock engine and you have 14.5 PSI fuel pressure, you may want to actually take some AE away. Too much will make it want to stumble and miss. It's a balancing act like PJG1173 said.

BLG

[Rally Smith]

Being a stock engine and you have 14.5 PSI fuel pressure, you may want to actually take some AE away. Too much will make it want to stumble and miss. It's a balancing act like PJG1173 said.
BLG

I've read in several places where 13 psi was barely enough to run the engine as it was.

[BLG355]

The whole reason for AE is to keep the engine from dying when you open the throttle, which causes vacuum loss. It acts like the accelerator pump does on a carb. Based on what I know; intake, heads, and throttle body size are the direct factors in setting the AE. I had to retune my AE when I went from the 5.7 to 454 throttle body, and again when I went from 5.7 to 7.4 injectors. I was running 61# injectors at 22psi, and I am now running 80# injectors at 18psi. on the 5.7 injectors at one point I had it topping out at over 8000 at 50%, now it is under 5000, but still way more than stock. My build isn't overly aggressive but with the increased plenum volume and larger heads it definitely needed a lot more AE over stock.

Is it cutting out when you hit the throttle? from my experiences it will cutout when it needs more, and stumble when it's too much. I've already had it puffing black smoke out.

BLG