Tuning help please 402
Tuning help please 402 combo is 402 ls2 block, afr 225 heads, 238/240 @ 113 cam lift is around 610-614 i believe. fast 90/90. 2000 pcm using ls1 edit. Car wont idle unless i hold the gas pedal about 5% down. to keep it at 950-1000 rpm. Running really rich with afr at 10.5 to 1 I have my idle speed increased to about 950, ive lowered my Cranking, main, and secondary VE by 30% under stock, My fuel air multiplier table i lowered from 20-25 kpa by 20% at all temps. Still only got the afr to 10.3-10.7 to 1. Not sure if I should have changed different things . Kind of newb to the tuning thing 
Just reading info from tuning doc's etc and reading posts. Any help or suggestions would be appreciated.
Thanks
Ron H.
Just reading info from tuning doc's etc and reading posts. Any help or suggestions would be appreciated.Thanks
Ron H.
The know it all's know it all
Joined: Oct 2006
Posts: 500
Likes: 0
Lets start with injector Size and MAF values.
Are you using your stock MAF ?? if not did you put the correct MAF table in.
If you changed the injectors did you change the Injector fuel rat table to match ?
Also have you checked Fuel pressure ?
Could be a stuck open injector but check the simple things first.
Are you using your stock MAF ?? if not did you put the correct MAF table in.
If you changed the injectors did you change the Injector fuel rat table to match ?
Also have you checked Fuel pressure ?
Could be a stuck open injector but check the simple things first.
Teching In
Joined: Dec 2004
Posts: 27
Likes: 0
From: New Haven, CT.
Originally Posted by Mrbowtie26
anyone ? please
New to tuning, you can make a lot of changes, but cam tuning is more advanced.
With that said, I do HPTuners tuning at my shop in New Haven. Shot me a PM if you want me to help straigthen it out for you.
If it was a simple answer, I'd tell you but it's not that simple.
Ed
Originally Posted by CollinsAutomotive
Lets start with injector Size and MAF values.
Are you using your stock MAF ?? if not did you put the correct MAF table in.
If you changed the injectors did you change the Injector fuel rat table to match ?
Also have you checked Fuel pressure ?
Could be a stuck open injector but check the simple things first.
Are you using your stock MAF ?? if not did you put the correct MAF table in.
If you changed the injectors did you change the Injector fuel rat table to match ?
Also have you checked Fuel pressure ?
Could be a stuck open injector but check the simple things first.
Trending Topics
The know it all's know it all
Joined: Oct 2006
Posts: 500
Likes: 0
Originally Posted by Mrbowtie26
The injectors are 42 lb lucas injectors, I also have a racetronix fuel pump intank, I did adjust for the injectors being 42lb based off of numbers I got from a link I dont have atm. I'm embarrased to say when the car was almost stock it had a huge driveability problem which I traced to the maf sensor. I put on the granatelli maf sensor from my 95 firebird that I had to check if that helped and problem went away so I left it on there.
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
Don't pay to much to what your afr at idle is. You just need to get it to where it acts good. My 408 idles at 1100 rpms. My timing is at 28* wot. I'd have to look at the tune to see where it is at idle.
I don't know **** about tuning but I know it's not a good idea to post a for help thread because everyone tunes differently....Good luck.
Oh and my car wouldn't even start until I drilled my throttle body. Some drill and some will just mess with the butterfly on the throttle body. Your choice.
I don't know **** about tuning but I know it's not a good idea to post a for help thread because everyone tunes differently....Good luck.
Oh and my car wouldn't even start until I drilled my throttle body. Some drill and some will just mess with the butterfly on the throttle body. Your choice.
Ok, I turned down my VE main, secondary , and cranking tables down to about 55 % of stock settings and it will actually start and kind of idle now afr is also up near the 14 to 1 area turned idle screw in a little and it seemed to help, after it warmed up and i assume went into CL the afr values were between 14.4 to 1 and 15.0 to 1. Thing is after it was running for a good 10-15 min i noticed afr dropped to about 12.5-9 to 1. Im gonna let it cool off and do a cold start tomorrow and check it again. God I need to get a good scanner. The scanner I can get from efi live , can I upgrade that to the newest version of the tuning software if I want to later ? I think i read the scanner only was around 300 ?
Thanks
Ron H.
afr is also up near the 14 to 1 area turned idle screw in a little and it seemed to help, after it warmed up and i assume went into CL the afr values were between 14.4 to 1 and 15.0 to 1. Thing is after it was running for a good 10-15 min i noticed afr dropped to about 12.5-9 to 1. Im gonna let it cool off and do a cold start tomorrow and check it again. God I need to get a good scanner. The scanner I can get from efi live , can I upgrade that to the newest version of the tuning software if I want to later ? I think i read the scanner only was around 300 ?Thanks
Ron H.
The know it all's know it all
Joined: Oct 2006
Posts: 500
Likes: 0
Originally Posted by Mrbowtie26
Ok, I turned down my VE main, secondary , and cranking tables down to about 55 % of stock settings and it will actually start and kind of idle now afr is also up near the 14 to 1 area turned idle screw in a little and it seemed to help, after it warmed up and i assume went into CL the afr values were between 14.4 to 1 and 15.0 to 1. Thing is after it was running for a good 10-15 min i noticed afr dropped to about 12.5-9 to 1. Im gonna let it cool off and do a cold start tomorrow and check it again. God I need to get a good scanner. The scanner I can get from efi live , can I upgrade that to the newest version of the tuning software if I want to later ? I think i read the scanner only was around 300 ?
Thanks
Ron H.
afr is also up near the 14 to 1 area turned idle screw in a little and it seemed to help, after it warmed up and i assume went into CL the afr values were between 14.4 to 1 and 15.0 to 1. Thing is after it was running for a good 10-15 min i noticed afr dropped to about 12.5-9 to 1. Im gonna let it cool off and do a cold start tomorrow and check it again. God I need to get a good scanner. The scanner I can get from efi live , can I upgrade that to the newest version of the tuning software if I want to later ? I think i read the scanner only was around 300 ?Thanks
Ron H.
Put your car in open loop. The VE tables have nothing to do with fueling at idle unless your running a SD operating system. a 55% decrease in those table vaues in a SD tune tells me that you injector size is set to small.
Originally Posted by CollinsAutomotive
Put your car in open loop. The VE tables have nothing to do with fueling at idle unless your running a SD operating system. a 55% decrease in those table vaues in a SD tune tells me that you injector size is set to small.
I thought the VE was used during cold start / idle ? all I know is when I changed it I could actually idle .
Originally Posted by CollinsAutomotive
Can you put up the part number and are these flowed rated at 45psi ?Injector size is probobaly wrong.
Part Number Delphi 01D030B (Lucas old 5208009, Lucas New 621031, Delphi old D3181AA)
Static Flow Rate: 42.29 lb/hr @ 43.5PSI (300kPa) or 320gm/min
Static Flow Rate: 48.83 lb/hr @ 58.0PSI (300kPa) or 370gm/min
Dynamic Flow Rate: 9.96 gm/pulse - 2.5ms pulse width and 10ms repetition rate @ 43.5PSI
Coil Resistance: 15.9 Ohms / High Impedance / High-Z(No ECM driver modifications required)
Most here use this calculator to figure out IFR. Assuming he measured the fuel pressure at the rail, it's pretty accurate.
http://www.allmod.net/hpt/injectors.xls
Originally Posted by Mrbowtie26
Ok, I turned down my VE main, secondary , and cranking tables down to about 55 % of stock settings and it will actually start and kind of idle now afr is also up near the 14 to 1 area turned idle screw in a little and it seemed to help, after it warmed up and i assume went into CL the afr values were between 14.4 to 1 and 15.0 to 1. Thing is after it was running for a good 10-15 min i noticed afr dropped to about 12.5-9 to 1. Im gonna let it cool off and do a cold start tomorrow and check it again. God I need to get a good scanner. The scanner I can get from efi live , can I upgrade that to the newest version of the tuning software if I want to later ? I think i read the scanner only was around 300 ?
Thanks
Ron H.
afr is also up near the 14 to 1 area turned idle screw in a little and it seemed to help, after it warmed up and i assume went into CL the afr values were between 14.4 to 1 and 15.0 to 1. Thing is after it was running for a good 10-15 min i noticed afr dropped to about 12.5-9 to 1. Im gonna let it cool off and do a cold start tomorrow and check it again. God I need to get a good scanner. The scanner I can get from efi live , can I upgrade that to the newest version of the tuning software if I want to later ? I think i read the scanner only was around 300 ?Thanks
Ron H.
Setting the TB set screw correctly is a big part of getting a stroker to idle correctly. I noticed the 90mm TB's need to be opened up alot more compared to a stock TB. You need to remove the air intake tract and visually check to see how much it's open. You will see a 1/4 turn of the set screw does very little to open a 90mm TB.
You will also need to adjust the idle tables. But you really need a scanner to measure the IAC steps. At warm idle mine idles best in the 60 step range. The EFIlive scanner is nice because you can use the bi-directional controls to manipulate the IAC steps real time to find the range your car idles best at. Thwn you can adjust the idle tables accordingly.