PE vs RPM Question
Thread Starter
TECH Enthusiast
Joined: Aug 2002
Posts: 535
Likes: 0
From: Ohio
PE vs RPM Question Is there a limit as to how low I can scale the pe vs rpm table?
On the dyno with Air Fuel I'm at 11.5 for 5000 rpm and up. I have tried pulling fuel from 5k and up but everytime I pull fuel I make another run and its still 11.5. My settings are below 1 meaning they are 0.997 or whatever but lower than 1.0 I'm wondering if this is a valid entry for that field. I can't figure out why I can't tune that range. I am also noticing that I have to make huge changes to the table to see results. I will have to add or remove like 10% to see a .5 change in AFR. Any Ideas?
Thanks Rob
On the dyno with Air Fuel I'm at 11.5 for 5000 rpm and up. I have tried pulling fuel from 5k and up but everytime I pull fuel I make another run and its still 11.5. My settings are below 1 meaning they are 0.997 or whatever but lower than 1.0 I'm wondering if this is a valid entry for that field. I can't figure out why I can't tune that range. I am also noticing that I have to make huge changes to the table to see results. I will have to add or remove like 10% to see a .5 change in AFR. Any Ideas?
Thanks Rob
Thread Starter
TECH Enthusiast
Joined: Aug 2002
Posts: 535
Likes: 0
From: Ohio
I have the rear o2 omitted completly. I don't run CATS. But COT was at 920 930 940 and 1040 I raised them each by 100 and still had the same results. LTRMS are -3 to -5 befoer I go WOT then at WOT they go to 0. I've been pulling my hair out on this and can't figure it out. I managed to get it to 12.0 at 5 to 6k after 6 it drops fast and at 6200 its like 11.3. Just seems weird. And even in the lower rpm range why would have to add or pull so much to make a little change?
Thanks Rob
Thanks Rob
Trending Topics
Thread Starter
TECH Enthusiast
Joined: Aug 2002
Posts: 535
Likes: 0
From: Ohio
Red 01 what is your setup lets see if we have anything the same.
Heres mine
01 346 11:1
30 lb injectors
SLP LS6 MAF
Patriot Heads
231 237 cam TSP
HS Roller Rockers
Stock Length Pushrods
Heads have been milled .020 to get to 11:1
Heres mine
01 346 11:1
30 lb injectors
SLP LS6 MAF
Patriot Heads
231 237 cam TSP
HS Roller Rockers
Stock Length Pushrods
Heads have been milled .020 to get to 11:1
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo If your PE vs RPM table values are leaner than the OpenLoop F/A table the PCM will take the RICHEST value and use that overiding your PE table. You can either tune for it through the ve table or the open loop F/A table.
12 Second Truck Club
Joined: Oct 2002
Posts: 1,678
Likes: 0
From: Salt Lake City, Utah
Originally Posted by HumpinSS
If your PE vs RPM table values are leaner than the OpenLoop F/A table the PCM will take the RICHEST value and use that overiding your PE table. You can either tune for it through the ve table or the open loop F/A table.
Thread Starter
TECH Enthusiast
Joined: Aug 2002
Posts: 535
Likes: 0
From: Ohio
Originally Posted by HumpinSS
If your PE vs RPM table values are leaner than the OpenLoop F/A table the PCM will take the RICHEST value and use that overiding your PE table. You can either tune for it through the ve table or the open loop F/A table.
Also let me throw in another loop for you guys. I am running 29 degrees of timing on 93 octane fuel. The motor has a CR of 11:1 I see no knock at all. Isn't that a little weird?
I often wonder if my computer is f'ed up.
12 Second Truck Club
Joined: Oct 2002
Posts: 1,678
Likes: 0
From: Salt Lake City, Utah
Originally Posted by HumpinSS
If your PE vs RPM table values are leaner than the OpenLoop F/A table the PCM will take the RICHEST value and use that overiding your PE table. You can either tune for it through the ve table or the open loop F/A table.
12 Second Truck Club
Joined: Oct 2002
Posts: 1,678
Likes: 0
From: Salt Lake City, Utah
Originally Posted by LEATHL_WS6
Where is this Open Loop table. Should I scale my IFR table so I can keep the PE vs RPM above 1.0 in all ranges?
Also let me throw in another loop for you guys. I am running 29 degrees of timing on 93 octane fuel. The motor has a CR of 11:1 I see no knock at all. Isn't that a little weird?
I often wonder if my computer is f'ed up.
Also let me throw in another loop for you guys. I am running 29 degrees of timing on 93 octane fuel. The motor has a CR of 11:1 I see no knock at all. Isn't that a little weird?
I often wonder if my computer is f'ed up.
Originally Posted by Black Blown 02
Thats interesting, do you mean it takes the richest value in the openloop F/A table? Like a 1.3.
It takes the richest value between the two table eg
PE=1.00
F/A=1.13
The PCM will take the F/A table and apply that in WOT or
PE 1.25
F/A 1.13
PCM will tAKE THE pe value
Sounds ike you scaled you IFR table which richened EVERYTHING up and now you are trying to get it back to where it needs to be
12 Second Truck Club
Joined: Oct 2002
Posts: 1,678
Likes: 0
From: Salt Lake City, Utah
Originally Posted by LEATHL_WS6
Where is this Open Loop table. Should I scale my IFR table so I can keep the PE vs RPM above 1.0 in all ranges?
Also let me throw in another loop for you guys. I am running 29 degrees of timing on 93 octane fuel. The motor has a CR of 11:1 I see no knock at all. Isn't that a little weird?
I often wonder if my computer is f'ed up.
Also let me throw in another loop for you guys. I am running 29 degrees of timing on 93 octane fuel. The motor has a CR of 11:1 I see no knock at all. Isn't that a little weird?
I often wonder if my computer is f'ed up.
My pe/rpm are all in the 1.1xx-1.2xx range and are very responsive to changes, and very consistant. A 5% change to pe/rpm numbers gets me a 5% AFR change. Verified by an incar wideband.
Thread Starter
TECH Enthusiast
Joined: Aug 2002
Posts: 535
Likes: 0
From: Ohio
I changed the IFR tabe when I put i the bigger injectors. Then I tuned with the MAF table to get the ltrims -. Maybe I moved the IFR table too much. I'm pulling up LS1 edit now to see where my Open loop table is. Can or should the open loop table be changed?
Thread Starter
TECH Enthusiast
Joined: Aug 2002
Posts: 535
Likes: 0
From: Ohio
That would make sense none of my af mult table is below 1.070. I guess I'm going to put my maf ifr and pe table back to stock and go from there. What would be the correct amount to change the IFR table for 30lb svo injectors. Going from 28's?
12 Second Truck Club
Joined: Oct 2002
Posts: 1,678
Likes: 0
From: Salt Lake City, Utah
Originally Posted by LEATHL_WS6
I changed the IFR tabe when I put i the bigger injectors. Then I tuned with the MAF table to get the ltrims -. Maybe I moved the IFR table too much. I'm pulling up LS1 edit now to see where my Open loop table is. Can or should the open loop table be changed?
I wonder if you'd have better results if you changed your MAF table back to stock, then adjusted your IFR to get you desired LTRIMS? That's how I did it. My MAF table is stock, and it still has the screen.
12 Second Truck Club
Joined: Oct 2002
Posts: 1,678
Likes: 0
From: Salt Lake City, Utah
Originally Posted by LEATHL_WS6
That would make sense none of my af mult table is below 1.070. I guess I'm going to put my maf ifr and pe table back to stock and go from there. What would be the correct amount to change the IFR table for 30lb svo injectors. Going from 28's?
