PE table values

[talldude68]

This is my current PE table that was put in my car by my tuner. I am about to go an tune MAF and VE, but I want to get the PE table in line before I do.

What do you guys think it should be set too. My Engine is Stock (LS1 in a 1999 corvette) with a vortech Supercharger running 7 PSI. I am thinking it is a bit rich for the low end RPMs and FAT at 6k an above. Not sure exactly what to shoot for. What do you guys run in your PE table.

[Eagle]

That PE table is whack. I don't know much about FI applications, but I know better than commanding ~8.7 @ 6000RPM @ WOT....

You should post the rest of your tune. Something is most likely WAY off....

[talldude68]

I couldn't agree more. It is all over the place. I have a WB installed in the car and I am going to go out and drive around and get things in line with AFR error%. But I don't want to have to do this over again. So I want to get the PE table in line before going out and tuning. Its the last part to get in the tune before uploading and tuning. I do believe I read somewhere to have WOT area in the 11.x territory on FI. But what about lower RPMs. What should that be?

Fueling tables are set per Greg Bannish info I got from his DVD. Need to get this thing running right.

[SSpdDmon]

Getting commanded AFR to = actual AFR is what all of the posts will help you get to. To help answer your other question - What AFR is right for your application? - I offer you my suggestion. I have a Procharged '99 f-body and for my tune, I prefer to run 12.5:1 down low, fatten it up to ~12.0:1 at peak torque, and top it off a little more at ~11.8:1 up top. My reasoning for this is, with the D1SC I'm running, I build boost in line with RPM. So down low where I'm only making 2~3psi, it's not necessary to flood the engine with extra fuel. Conversely, timing doesn't have as much pulled from what was there from the factory down low. I still run what I consider to be very conservative timing for 7psi cent. blower setup. It looks like:

RPM Degrees
1200 12.0
1400 14.3
1600 16.2
1800 17.5
2000 18.5
2200 19.0
2400 19.0
2800 18.8
3200 18.0
3600 16.8
4000 15.0
4400 15.0
4800 15.0
5200 15.0
5600 15.5
6000 16.0
6400 16.0
6800 16.0
7200 16.0
7600 16.0
8000 16.0

Hope that helps shed some light for ya.

[Cantalope Kid]

When does boost come in (rpm)? Set your PE ratio for a normal commanded fuel setting below this rpm (i.e. 12.5 AFR) ...if your running a custom OS you can leave the PE ratio setup for daily driving and then put in a much richer value in the BE table.

I'm guessing this wasn't covered in the $249 Banish DVD.

[talldude68]

Getting commanded AFR to = actual AFR is what all of the posts will help you get to. To help answer your other question - What AFR is right for your application? - I offer you my suggestion. I have a Procharged '99 f-body and for my tune, I prefer to run 12.5:1 down low, fatten it up to ~12.0:1 at peak torque, and top it off a little more at ~11.8:1 up top. My reasoning for this is, with the D1SC I'm running, I build boost in line with RPM. So down low where I'm only making 2~3psi, it's not necessary to flood the engine with extra fuel. Conversely, timing doesn't have as much pulled from what was there from the factory down low. I still run what I consider to be very conservative timing for 7psi cent. blower setup. It looks like:

RPM Degrees
1200 12.0
1400 14.3
1600 16.2
1800 17.5
2000 18.5
2200 19.0
2400 19.0
2800 18.8
3200 18.0
3600 16.8
4000 15.0
4400 15.0
4800 15.0
5200 15.0
5600 15.5
6000 16.0
6400 16.0
6800 16.0
7200 16.0
7600 16.0
8000 16.0

Hope that helps shed some light for ya.

My setup is pretty much like yours. Vortech centri with 2-3 lbs down low. I was thinking somewhere around 12.5 down low. But was not sure. Like your upper setting, I have read about having the upper RPMs in the 11s AFR. I have the AFR error setup in the scanner. just need to put it in close loop and drive. Your timing up top is like mine.
Thanks for the suggestions.

[talldude68]

When does boost come in (rpm)? Set your PE ratio for a normal commanded fuel setting below this rpm (i.e. 12.5 AFR) ...if your running a custom OS you can leave the PE ratio setup for daily driving and then put in a much richer value in the BE table.

I'm guessing this wasn't covered in the $249 Banish DVD.

Thanks for the info. I am not running a custom OS. So no BE table.

[RWTD]

I'm guessing this wasn't covered in the $249 Banish DVD.

Come on man! Seriously, WTF is wrong with you to continue your beef towards Greg (however subtle you're attemping to now make it). This is twice in the same day, and several or more times now in the last, what, 6 months? Grow up a little!

[Z06SUPERCHARGED]

Interesting info on your AFR's with the Procharger. I have debated long and hard exactly what kind of AFR's I should run with my blown centri setup making 12 psi right now. I have it for 11.5 across the whole range currently but really curious if I could go maybe high 11's down lower and mid 11's through peak torque area. Its a toss up but I know 11.54 is plenty safe.

[blacklightning744]

Interesting info on your AFR's with the Procharger. I have debated long and hard exactly what kind of AFR's I should run with my blown centri setup making 12 psi right now. I have it for 11.5 across the whole range currently but really curious if I could go maybe high 11's down lower and mid 11's through peak torque area. Its a toss up but I know 11.54 is plenty safe.

u wont really know until u throw it on a dyno, u have to see where u peak at, torque curve, then based on that u make changes to the AFR and see which tweaks make the most amount of power, but only do this after commanded meets actual AFR.

[TURBO 6.0]

Your PE table is just a commanded AFR that will only work if your MAF curve is set up properly. I would set the entire PE table to a safe 11.5 (1.278) to make it easier to dial in the MAF curve. Make the needed adjustments to the MAF until you achieve 11.5 everywhere. (I do it this way because it is harder to chase a constantly changing PE table until the MAF curve is close) Once you are getting 11.5 consistantly then you can go into the PE table and start leaning it out where needed. If you have properly set up the MAF curve then you should be getting the AFR that you are commanding in the PE table.

[carlrx7]

Your PE table is just a commanded AFR that will only work if your MAF curve is set up properly. I would set the entire PE table to a safe 11.5 (1.278) to make it easier to dial in the MAF curve. Make the needed adjustments to the MAF until you achieve 11.5 everywhere. (I do it this way because it is harder to chase a constantly changing PE table until the MAF curve is close) Once you are getting 11.5 consistantly then you can go into the PE table and start leaning it out where needed. If you have properly set up the MAF curve then you should be getting the AFR that you are commanding in the PE table.

this is what i suggest, after its dialed in at 11.5 i use 11.7 for the lower rpm range then 11.3 at peak torque, then back to 11.5 for high rpm

-carl

[Ben Charles]

I guess I don't see the math but when looking at the PE table, how are we determing AFR by the numbers?? Example from above 11.5 AFR=1.278

My table is set to 1.25 (probably around 11.3AFR)? and I am wondering why it would be even set up in the lower RPM's why couldn't 0 be used. I look at the PE table as something thats only needed when the MAF is maxed out, correct me if I am wrong.

Soo if the MAF maxes out at say 4500 rpms, then the PE table only needs to be modded from then on correct???

[Wnts2Go10O]

I guess I don't see the math but when looking at the PE table, how are we determing AFR by the numbers?? Example from above 11.5 AFR=1.278

My table is set to 1.25 (probably around 11.3AFR)? and I am wondering why it would be even set up in the lower RPM's why couldn't 0 be used. I look at the PE table as something thats only needed when the MAF is maxed out, correct me if I am wrong.

Soo if the MAF maxes out at say 4500 rpms, then the PE table only needs to be modded from then on correct???

14.7/ PE table number

the maf situation would need to be fixed as it tries to get the a/f before pe mode to 14.7:1.

[Ben Charles]

Thanks, that makes sense. However I wonder why the PE value is set all the way across the same richness. Anything below boost I would think a different value would be used (leaner) say at idle using 1.00=14.7???

[Wnts2Go10O]

Thanks, that makes sense. However I wonder why the PE value is set all the way across the same richness. Anything below boost I would think a different value would be used (leaner) say at idle using 1.00=14.7???

PE only engages at beyond a certain throttle percentage.

[Ben Charles]

ok, is that a table we can adjust or is that automatically built into the ECU?

[Wnts2Go10O]

ok, is that a table we can adjust or is that automatically built into the ECU?

yep. read the sticky and the help file in HPT. its all there.

[HPclueless]

14.7/ PE table number

the maf situation would need to be fixed as it tries to get the a/f before pe mode to 14.7:1.

is it always divided by 14.7? or is it divided by the commanded AFR? suppose im commanding 14.3....would i still ste the PE as 14.7/pe #, or would i use 14.3/pe #?

[orange ss]

divide by your commanded AFR