Who has problems with hot starts?
Jul 26, 2012 | 07:55 PM
#21
Thread Starter
Joined: Dec 2010
Posts: 5,235
Likes: 4
From: Las Vegas, NV
I am currenlty running the beta. I've tried tweaking the airflow tables and stock seems to work the best. I put everything back to stock to start fresh. I then started tweaking the FA mult stage 1 table and that has helped a lot. I just wish I knew what that table does..
Jul 27, 2012 | 10:25 PM
#24
and the way your lower ve on the main ve tables falls off from 60- 105 kpa at 400 rpms will contribute to stubble. With it like that the pcm will pull fuel until it dies off. It will cause a lot of idle surge, you want to add ve to the 400 rpm table so when it fall below the desired idle the pcm will add fuel and timing to correct the error. Now I am not a pro but that looks like a problem to me. Look at some stock tunes and you will see the spike upwards in ve to correct idle
Jul 27, 2012 | 10:57 PM
#25
Staging Lane
Joined: Oct 2011
Posts: 81
Likes: 0
From: Michigan
I DO!! I don't know if this is a symptom of the larger than stock cam or if it can be tuned out. I have asked a few times over on the hptuners forum but it's like pulling teeth to get anyone to reply.
With the mods in my sig, should I have such a hard time starting my truck in hot weather? I've used the search and can't find any good advice on how to combat this in the tune.. Usually it takes several cranks of the key to get it to fire. The two logs below are pretty good starts but thrity minutes before I made the logs, it acted like it wasn't even going to start at the grocery store. Sometimes it will fire one or two cylinders and not start. Any ideas?
With the mods in my sig, should I have such a hard time starting my truck in hot weather? I've used the search and can't find any good advice on how to combat this in the tune.. Usually it takes several cranks of the key to get it to fire. The two logs below are pretty good starts but thrity minutes before I made the logs, it acted like it wasn't even going to start at the grocery store. Sometimes it will fire one or two cylinders and not start. Any ideas?
yep been having problems with this since i installed the 220/220 just gotta blip the throttle on start up a few times while its cranking. not really sure what it is. Did you get your idle raised?
Jul 27, 2012 | 11:05 PM
#26
This is one of the best help pages that I know of for idle tuning
Idle Tuning How-To & Guide (w/pictures) - HP Tuners Bulletin Board
Idle Tuning How-To & Guide (w/pictures) - HP Tuners Bulletin Board
Jul 28, 2012 | 01:59 PM
#27
12 Second Club
Joined: Dec 2008
Posts: 281
Likes: 0
From: A small town, MS
From looking at your tune, I'd say you need to add a decent amount to your startup airflow initial table in the 176-212 cells. Try starting at a value of .3 and then adjusting it up or down from there. Also add ten or twenty percent to your friction airflow initial table. See what that does for you. Like it is now, you have no initial airflow at running temps in your startup table, which usually does not work.
Aug 8, 2012 | 07:45 PM
#28
Thread Starter
Joined: Dec 2010
Posts: 5,235
Likes: 4
From: Las Vegas, NV
Sorry guys, I don't know how I missed these responses. I will post up the current tune so you all can take a look. Seems like anything I change doesn't help any.
I'm running the stock fuel pump.
I'm not having problems with idle. It idles like a champ.
Did you ever figure out a solution?
What fuel pump are you running?
and the way your lower ve on the main ve tables falls off from 60- 105 kpa at 400 rpms will contribute to stubble. With it like that the pcm will pull fuel until it dies off. It will cause a lot of idle surge, you want to add ve to the 400 rpm table so when it fall below the desired idle the pcm will add fuel and timing to correct the error. Now I am not a pro but that looks like a problem to me. Look at some stock tunes and you will see the spike upwards in ve to correct idle
yep been having problems with this since i installed the 220/220 just gotta blip the throttle on start up a few times while its cranking. not really sure what it is. Did you get your idle raised?
Aug 8, 2012 | 07:47 PM
#29
Thread Starter
Joined: Dec 2010
Posts: 5,235
Likes: 4
From: Las Vegas, NV
Who knows what their pulsewidths are during cranking at operating temp?? Mine are about 50% higher than my pulsewidths at idle. I read on FAST's site that is where they should be but i'm still seeing hard starts.
