LS1 edit, need help
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 3,333
Likes: 1
From: Central NJ/PA
LS1 edit, need help
I just installed a GM ASA cam(226/236 .525/.525) and Heads(LS6 cnc ported milled to 60 cc chambers), now the the car wont start without stepping on the gas,wont idle and has bad throtle response.
Ls1 edit should be here tomorrow
What were should I start make adjustments and what should the be?
thanks
J
Ls1 edit should be here tomorrow
What were should I start make adjustments and what should the be?thanks
J
Le Mans Master
Joined: Jul 2002
Posts: 7,076
Likes: 26
From: Nevada and Florida
Take a look at this thread: http://www.ls1tech.com/forums/showthread.php?t=149741
There is much to learn about tuning. How to properly adjust the VE, IFR, PE, etc. tables is usually trial and error without a dyno.
There is much to learn about tuning. How to properly adjust the VE, IFR, PE, etc. tables is usually trial and error without a dyno.
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 3,333
Likes: 1
From: Central NJ/PA
Originally Posted by BHP
Take a look at this thread: http://www.ls1tech.com/forums/showthread.php?t=149741
There is much to learn about tuning. How to properly adjust the VE, IFR, PE, etc. tables is usually trial and error without a dyno.
There is much to learn about tuning. How to properly adjust the VE, IFR, PE, etc. tables is usually trial and error without a dyno.
Safety Car
Joined: Mar 2002
Posts: 4,928
Likes: 1
Cruise-In V Veteran
St. Jude Donor '09
Originally Posted by cyclerage23
Remember the VE isn't used above 4000 RPM - straight MAF.
Things to watch at idle are LTFTs and Injector Pulsewidth. Hopefully you have EFILive??
Don't drill your TB. Adjust IAC Park instead at Intake air temps (IAT). The IAC Park table works opposite, to the Fbods, with Fly by Wire.
Here is an old post by NoGo:originally posted by NoGo on ls1tech.com
Here are some things you can try.
Idle Limiters --> Idle Speed: 950
Idle Limiters --> IAC Park Position: Raise all points from 40C and up to 21
Idle Limiters --> Idle Air In Gear: All points 60C and up to 8.6
Fuel --> Main VE Table: Multiply column 400 rpm by 60. Multiply column 800 by 80. Multiply column 1200 by 90.
Ignition --> High Octane Table: Add 2 deg to all points 400 to 1000 RPM, .08 to .32 g/sec
Once done with this program, start the car and check for surging. If the car surges, unplug the IAC and see if the surging stops. If the surging stops follow below.
Idle Limiters --> Idle Air in Gear --> All points above 60C to 9.2
Take the car for a drive and check your idle. If the car goes on cruise control reduce the Idle Air in Gear Table .2 (further if necessary). If the idle holds at 2000 RPM for extended periods of time reduce the P/N Airflow Decay table for all points above 10 MPH by 5% (multiply by 95) until this stops. Be vary careful on this table.
If car keeps surging with the IAC unplugged two more things to try.
Multiply Main VE table by another 95% (total reduction of 85%). Repeat until the surging goes away, or until the car begins to hesitate when you take off.
High Octane Ignition Table. Reduce timing for all points 400 to 1000 RPM, .08 to .32 g/sec by 2. Repeat, but don't reduce it any more than 6 degrees.
If your car still doesn't idle after this, then you have other problems, and should start looking elsewhere.
It's time consuming but fun.
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 3,333
Likes: 1
From: Central NJ/PA
Originally Posted by Bink
What's the LSA on your cam? If it's not too narrow you should be able to tune it without getting into the VE table.
Remember the VE isn't used above 4000 RPM - straight MAF.
Things to watch at idle are LTFTs and Injector Pulsewidth. Hopefully you have EFILive??
Don't drill your TB. Adjust IAC Park instead at Intake air temps (IAT). The IAC Park table works opposite, to the Fbods, with Fly by Wire.
Here is an old post by NoGo:originally posted by NoGo on ls1tech.com
Here are some things you can try.
Idle Limiters --> Idle Speed: 950
Idle Limiters --> IAC Park Position: Raise all points from 40C and up to 21
Idle Limiters --> Idle Air In Gear: All points 60C and up to 8.6
Fuel --> Main VE Table: Multiply column 400 rpm by 60. Multiply column 800 by 80. Multiply column 1200 by 90.
Ignition --> High Octane Table: Add 2 deg to all points 400 to 1000 RPM, .08 to .32 g/sec
Once done with this program, start the car and check for surging. If the car surges, unplug the IAC and see if the surging stops. If the surging stops follow below.
Idle Limiters --> Idle Air in Gear --> All points above 60C to 9.2
Take the car for a drive and check your idle. If the car goes on cruise control reduce the Idle Air in Gear Table .2 (further if necessary). If the idle holds at 2000 RPM for extended periods of time reduce the P/N Airflow Decay table for all points above 10 MPH by 5% (multiply by 95) until this stops. Be vary careful on this table.
If car keeps surging with the IAC unplugged two more things to try.
Multiply Main VE table by another 95% (total reduction of 85%). Repeat until the surging goes away, or until the car begins to hesitate when you take off.
High Octane Ignition Table. Reduce timing for all points 400 to 1000 RPM, .08 to .32 g/sec by 2. Repeat, but don't reduce it any more than 6 degrees.
If your car still doesn't idle after this, then you have other problems, and should start looking elsewhere.
It's time consuming but fun.
Remember the VE isn't used above 4000 RPM - straight MAF.
Things to watch at idle are LTFTs and Injector Pulsewidth. Hopefully you have EFILive??
Don't drill your TB. Adjust IAC Park instead at Intake air temps (IAT). The IAC Park table works opposite, to the Fbods, with Fly by Wire.
Here is an old post by NoGo:originally posted by NoGo on ls1tech.com
Here are some things you can try.
Idle Limiters --> Idle Speed: 950
Idle Limiters --> IAC Park Position: Raise all points from 40C and up to 21
Idle Limiters --> Idle Air In Gear: All points 60C and up to 8.6
Fuel --> Main VE Table: Multiply column 400 rpm by 60. Multiply column 800 by 80. Multiply column 1200 by 90.
Ignition --> High Octane Table: Add 2 deg to all points 400 to 1000 RPM, .08 to .32 g/sec
Once done with this program, start the car and check for surging. If the car surges, unplug the IAC and see if the surging stops. If the surging stops follow below.
Idle Limiters --> Idle Air in Gear --> All points above 60C to 9.2
Take the car for a drive and check your idle. If the car goes on cruise control reduce the Idle Air in Gear Table .2 (further if necessary). If the idle holds at 2000 RPM for extended periods of time reduce the P/N Airflow Decay table for all points above 10 MPH by 5% (multiply by 95) until this stops. Be vary careful on this table.
If car keeps surging with the IAC unplugged two more things to try.
Multiply Main VE table by another 95% (total reduction of 85%). Repeat until the surging goes away, or until the car begins to hesitate when you take off.
High Octane Ignition Table. Reduce timing for all points 400 to 1000 RPM, .08 to .32 g/sec by 2. Repeat, but don't reduce it any more than 6 degrees.
If your car still doesn't idle after this, then you have other problems, and should start looking elsewhere.
It's time consuming but fun.
Ive already brought the p/n airflow up to about 31 from 40c across. And dropped the throttle follower decay down by 40%, Its idling,
but wont start on its own id warned up.
I need to get started with the VE, but I dont have EFI live or anything. Where can I get it or something close?
Melting Slicks
Joined: Jun 2004
Posts: 3,413
Likes: 277
From: NC
Originally Posted by cyclerage23
I just installed a GM ASA cam(226/236 .525/.525) and Heads(LS6 cnc ported milled to 60 cc chambers), now the the car wont start without stepping on the gas,wont idle and has bad throtle response.
Ls1 edit should be here tomorrow What were should I start make adjustments and what should the be?
thanks
J
Ls1 edit should be here tomorrow
What were should I start make adjustments and what should the be?thanks
J
also, do this w/ the A/C on....it should die after the first rev, but will get a little better.
Do yourself a favor and take it to a dyno. I paid $400 for the LS-1 edit tune and have unlimited updates, just pay for the dyno time.
keep us posted..
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 3,333
Likes: 1
From: Central NJ/PA
Originally Posted by nextphasemarko
What you have described is normal....your car needs to learn all over again..... let it run for awhile and give it some revs and see if it will start to learn where to idle.....it probably idles too low and dies, right?
also, do this w/ the A/C on....it should die after the first rev, but will get a little better.
Do yourself a favor and take it to a dyno. I paid $400 for the LS-1 edit tune and have unlimited updates, just pay for the dyno time.
keep us posted..
also, do this w/ the A/C on....it should die after the first rev, but will get a little better.
Do yourself a favor and take it to a dyno. I paid $400 for the LS-1 edit tune and have unlimited updates, just pay for the dyno time.
keep us posted..
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Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 3,333
Likes: 1
From: Central NJ/PA
Originally Posted by cyclerage23
I was thinking about that but I want some more seat/tune time before I try to really stick it in the hot seat. Is autotap/efilive the only way to see what the pcm is doing? i.e. ltft's and knock retard?
Thread Starter
Melting Slicks
Joined: Aug 2002
Posts: 3,333
Likes: 1
From: Central NJ/PA
Originally Posted by Gooseman
take .050 off of the intake manifold where the bolts come thru
the intake might not be sealing do to the heads being milled.
the intake might not be sealing do to the heads being milled.
