Idle tuning

[02Ls1]

Hello guys im new to this i just bought hp tuners because im tired of taking it to a shop and get it tune so decided to tune it, i have an ls1 with a cam, cai, 2800 stall, i follow the steps of the idle tuning it help the only thing is that sometimes when i put it in reverse the car dies, what can be wrong with it? The car still have stock manifolds and the catalytics. Thanks in advance...

[WS6FirebirdTA00]

Log? Tune?

Read the stickies please.

[02Ls1]

ok so i have been reading a lot of the stickies and threads, so i follow the idle tuning steps then i follow the steps Frost gave in these page for the ve...http://www.hptuners.com/forum/showthread.php?t=29814 and these is what my ve came out with the first try of 20 to 25 minutes drive. Im new to these, what i did wrong or how it looks? Btw i havent tune it WOT.

[WS6FirebirdTA00]

PLEASE READ THE STICKIES!

You need to post all information if you want help. A tune is worthless without a log.

[02Ls1]

Thanks i will get a log later, right now i will give another pass to the stickies....

[02Ls1]

What does the iac park position do?

[CarsonTech]

IAC Park Position Airflow vs. IAT: This table is used to determine the Airflow to control the IAC/ETC when the IAC motor is in the park position. (ie. when the ignition is in the off position).

IAC Reset Park Position: This value is used to set the IAC motor position after a PCM reset.

[1957z28]

Ok, I'm a "newbe" so here it goes...
The engine is NOT a LS engine but Gen II LT4
BUT I'm running EFI conv with a 411 LS processor
and LS coils using a 2002 FB VIN.
Super Victor EFI intake / elbow and a billet 105mm tb (no IAC)
running E85 as fuel... 80lb injectors
CCam mech roller
Duration @.50 254 / 264 lift .681 / .673
Here's the problem anything under 1600 rpm STALL
Can anyone give me a start?
More timing?
(Im waiting on the E85 wideband from AEM to log WOT)
Thanks

[Google]

need a log file with airflow added to the table display.. also need to know what you set the icl @ ...

[edcmat-l1]

Ok, I'm a "newbe" so here it goes...
The engine is NOT a LS engine but Gen II LT4
BUT I'm running EFI conv with a 411 LS processor
and LS coils using a 2002 FB VIN.
Super Victor EFI intake / elbow and a billet 105mm tb (no IAC)
running E85 as fuel... 80lb injectors
CCam mech roller
Duration @.50 254 / 264 lift .681 / .673
Here's the problem anything under 1600 rpm STALL
Can anyone give me a start?
More timing?
(Im waiting on the E85 wideband from AEM to log WOT)
Thanks

Too much fuel, not enough timing. You need to dial in the VE and MAF. Niether have been done.

That cam in a LT motor will probably want 30 degrees idle timing.

You've got a RTT OS applied. Use it. Enable the VE/Spark/PE portion, and do a full flash. Use your VE table histogram. Put it in SD. That cam will run best in SD. I wouldn't even try running it in MAF mode. Even without a WB, you can start knocking fuel out of it from 1600 down, and you'll hear a noticable change in tone as you get closer to the sweet spot. I'd bet you'll be down 40% in the idle area.

Using your RTT, you'll be able to dial in the fueling and spark quickly. Read your tutorials. Read the stickies.

[Google]

to add.. you will never make the full power untill you adjust the injector timing.. the lt1 with ls1 pcm will make more power when injector timing has been tuned correct. the valve events are not the same as a stock ls1 cam with the monster cam you have.. food for thought..

[WS6FirebirdTA00]

Anything more to add on what changes have been made to injector timing? Which way to move, how much, etc.?

[Google]

Anything more to add on what changes have been made to injector timing? Which way to move, how much, etc.?

if your asking me.. would depend on cam profile and the desired effect.. full power with no care of fuel smell I would start decreasing the normal and makeup tables by 10% to start for a mid size cam ie; 218 - 225 duration or 114 lsa and see what power is made on the dyno.. if you want less fuel smell with a small sacrafice in power compaired to subtracting then add to the normal and makup tables.. dyno and desired results will be the main factor in what direction you adjust.. as stated in the other thread I brain farted in..

[ctd]

And for startup leanness when the engine is hot:

Attachment 4694 Attachment 4695 Attachment 4696 Attachment 4697 Attachment 4698

Ed would you please describe the symptom of this condition?

Is it when the throttle must be pressed to restart when hot after stalling?

[S2H]

Anything more to add on what changes have been made to injector timing? Which way to move, how much, etc.?

I'm actually finding that on most cammed cars, the injector timing seems to make more power when you start to get past the exhaust blowby..
in an LS1 based vehicle, most of the time that equates to moving the injector timing further positive.
and this is all dependent on cam valve events and where the original settings are at to begin with...

in an ideal world we spray all fuel when the exhaust is completely closed...
which works good with a stock cam which has no overlap at .050 lift, and minimal overlap at .006(if any at all)
but our world is not ideal..especially when we start to add an aftermarket cam in the picture.

everything I have found on the dyno so far has shown the principle of making more power by wasting less fuel out the exhaust has benefits at all rpm's but is most noticeable when you are far less than 80% IDC.. once your injectors are open for most of the cycle of the engine, it doesnt matter where you spray at. what this equates to...less gas smell at idle, better part throttle fuel economy, more low end torque. the top end of teh scale doesnt really see these benefits once IDC gets larger.

[domestic rice]

I am having the hot idle surge problem after I got my base idle down and tried to move into the VE tune. Really looking to get this fixed, would you say this thread is still valid or is there a different/up to date method to use? I have tried moving timing around as well as mult% VE 3 or 4 times and still no go.

[Midnite Magic]

Generally you do not need to adjust the IAC steps VS effective area unless you have a larger than stock throttle body.

Link or correct way to do this with a 90mm cable TB

[zq8blazer]

I've done this and it really helped my idle, but what do I need to do about power? It keeps bogging down when I shift or give it a lot of gas. It's a 350 Vortec with a 411 PCM and LT4 Hot Cam.

[kj217]

i couldn't get an LS1 holden with MS4 cam to idle until i plugged out map,, reduced fuel to leanest possible,, jacked up base airflow and spark,, after all that,, car surges once on D,, and goes in cruise control,,
please, help,,
can i get such huge cam to idle while afr around 14.7?

[WS6FirebirdTA00]

log? tune?