Idle and start up problems. please help.
09-04-2006 | 11:33 AM
#21
09-05-2006 | 04:17 PM
#23
Originally Posted by LS1 Sounds
I've only tuned one H/TRex/TH400 car so far, but was able to get it to start/idle/drive surprisingly great at 900rpms without drilling the TB. Base running airflow (RAF) was increased a LOT, also Startup airflow was added as well. VE was decreased <= 1600rpm, and timing was added. Idle overspeed spark values were cut in half.
09-05-2006 | 04:32 PM
#24
Originally Posted by SUX2BU
Ok my car has a tune in it and it drives great. My only problems are that it sucks *** on start up. I have to give it gas and slowly back off of it everytime i start it or else it won't idle. Even when at full operating temp.
Also if i stab the throttle even a little bit or just let off in first or second (RMVB th350 so 1st and 2nd have engine braking, its like being in neutral when i let off in 1st and 2nd) it dies.
I have the idle set at 950 with the IAC counts at about 30-40 in N/P and about 70-80 in gear. It also surges a little in N/P.
Its an M6 computer with a th350 tranny so it doesn't have in gear idle/ P,N idle differences.
I have Hp tuners available but have no clue where to start.
Also if i stab the throttle even a little bit or just let off in first or second (RMVB th350 so 1st and 2nd have engine braking, its like being in neutral when i let off in 1st and 2nd) it dies.
I have the idle set at 950 with the IAC counts at about 30-40 in N/P and about 70-80 in gear. It also surges a little in N/P.
Its an M6 computer with a th350 tranny so it doesn't have in gear idle/ P,N idle differences.
I have Hp tuners available but have no clue where to start.
Not to be a dick but I thought Brian was your boy and that **** was perfect? Now, I see this...seems its not always greener on the other side now is it?
Now that im done with the ribbing...dont mess with anything until you can find your stock VE table to compare too...id flash back to the stock one and log it to see what the car wants...but before you do that...the car needs a WIDEBAND on it before any changes are made at ALL! You need to see how rich it is now. Im guessing somewhere in the drowned area of AF ratios since its an RPM idle tune we are talking about.
Last edited by V6 Bird; 09-05-2006 at 04:40 PM.
09-05-2006 | 06:16 PM
#25
Originally Posted by V6 Bird
Not to be a dick but I thought Brian was your boy and that **** was perfect? Now, I see this...seems its not always greener on the other side now is it?
Now that im done with the ribbing...dont mess with anything until you can find your stock VE table to compare too...id flash back to the stock one and log it to see what the car wants...but before you do that...the car needs a WIDEBAND on it before any changes are made at ALL! You need to see how rich it is now. Im guessing somewhere in the drowned area of AF ratios since its an RPM idle tune we are talking about.
Now that im done with the ribbing...dont mess with anything until you can find your stock VE table to compare too...id flash back to the stock one and log it to see what the car wants...but before you do that...the car needs a WIDEBAND on it before any changes are made at ALL! You need to see how rich it is now. Im guessing somewhere in the drowned area of AF ratios since its an RPM idle tune we are talking about.
i do have a stock tune. to compare to. just don't know what to do.
Right now the #1 priority is to get it to start wihout having to play with the throttle and idle in nuetral/park without surging.
09-05-2006 | 06:35 PM
#26
Originally Posted by SUX2BU
i'm a retard when it comes to tuning so could you explain this.
Also you can email me your tune if you'd like and I will try to take a look at it. The address is chad AT dodds DOT cc:
Engine > Idle > Idle RPM > Target Idle Speed
Code:
1150.00003 1150.00003 1150.00003 1100.00002 1100.00002 1100.00002 1100.00002 1000.00002 900.00002 900.00002 900.00002 900.00002 900.00002 900.00002 900.00002 900.00002 1150.00003 1150.00003 1150.00003 1100.00002 1075.00002 1050.00002 975.00002 925.00002 900.00002 900.00002 900.00002 900.00002 900.00002 900.00002 900.00002 900.00002
Code:
24.20020 30.34961 30.09961 28.12305 25.99902 24.00000 22.97754 19.00000 16.58691 15.00000 14.40039 12.94629 11.71973 11.71973 11.71973 11.71973
Code:
0.400
Code:
5.00000 3.50000 3.00000 4.00000 4.00000 4.00000 3.00000 3.00000 3.00000 3.00000
Code:
100.00000 100.00000 100.00000 100.00000 100.00000 100.00000 100.00000 100.00000 100.00000 100.00000
Code:
30.93538 31.62424 32.67732 39.73220 33.48495 40.13602 42.03632 47.10380 38.91665 43.86536 47.84017 50.19180 40.78529 46.33576 50.35015 52.70178 42.16301 47.71348 51.56952 54.07950 43.54073 49.09120 52.54342 54.76836 45.20350 50.35015 53.27187 55.49681 46.13781 51.24488 54.00032 56.18567 47.06421 52.17128 54.93464 57.65049 46.73958 53.23228 56.02731 58.74317 47.10380 53.59651 57.04081 60.23966 47.51553 54.00032 58.45812 61.61738 47.84017 53.43023 59.10739 61.98160 49.17830 54.72877 59.87543 62.75756 50.51643 56.10649 61.05520 62.99510 51.15778 58.33935 62.43292 63.24055 53.02642 60.23966 63.81065 64.61827 54.88713 62.06870 65.22796 66.03559 54.88713 62.06870 65.22796 66.03559
Code:
30.00000 30.00000 30.00000 30.00000 30.00000 35.01099 37.27473 38.00000 38.32967 38.35165 38.13187 37.78022 37.34066 30.00000 30.00000 30.00000 30.00000 30.00000 35.01099 37.27473 38.00000 38.32967 38.35165 38.13187 37.78022 37.34066 30.00000 30.00000 30.00000 30.00000 30.00000 35.01099 37.27473 38.00000 38.32967 38.35165 38.13187 37.78022 37.34066 30.00000 30.00000 30.00000 30.00000 30.00000 35.01099 37.27473 38.00000 38.32967 38.35165 38.13187 37.78022 37.34066 30.00000 30.00000 30.00000 30.00000 30.00000 35.01099 37.27473 38.00000 38.32967 38.35165 38.13187 37.78022 37.34066 30.00000 30.00000 30.00000 30.00000 30.00000 34.37363 35.67033 36.39560 36.72527 36.72527 36.50549 36.17582 35.82418 30.00000 30.00000 30.00000 30.00000 30.00000 32.63736 33.97802 34.68132 34.94505 34.85714 34.61538 34.30769 34.08791 30.48352 28.74725 28.81319 25.69231 29.14286 31.45055 32.85714 33.58242 33.75824 33.62637 33.31868 33.05495 32.98901 24.57143 24.57143 26.50549 24.10989 28.02198 30.61538 32.15385 32.90110 33.03297 32.81319 32.46154 32.17582 32.17582 19.64835 19.64835 20.39560 21.01099 26.00000 29.93407 31.67033 32.48352 32.61538 32.32967 31.84615 31.42857 31.29670 14.39560 14.39560 14.39560 20.00000 25.01099 28.00000 30.00000 31.01099 32.00000 32.00000 31.29670 30.54945 30.98901 12.30769 12.30769 12.30769 19.34066 22.00000 27.01099 29.01099 30.00000 31.01099 31.01099 30.61538 29.31868 28.92308 10.30769 10.30769 10.30769 16.17582 19.78022 22.61538 25.01099 27.34066 27.34066 27.34066 27.34066 27.49451 27.51648 8.00000 8.00000 8.00000 13.01099 15.01099 17.01099 18.00000 21.01099 24.17582 24.61538 24.85714 25.07692 25.45055 8.00000 8.00000 8.00000 11.38462 12.50549 15.01099 16.50549 18.00000 19.01099 22.00000 23.34066 24.39560 25.16484 8.00000 8.00000 8.00000 10.00000 11.01099 12.50549 15.01099 16.00000 17.01099 18.00000 20.72527 22.74725 24.06593 7.71429 7.71429 7.71429 7.71429 7.71429 9.47253 12.61538 15.38462 17.01099 18.00000 18.90110 19.95604 21.91209 7.71429 7.71429 7.71429 7.71429 7.71429 9.47253 12.54945 15.23077 17.01099 18.00000 18.90110 19.71429 21.01099 7.71429 7.71429 7.71429 7.71429 7.71429 9.47253 12.54945 15.23077 16.83516 18.00000 18.90110 19.49451 20.30769 7.71429 7.71429 7.71429 7.71429 7.71429 9.47253 12.54945 15.23077 16.83516 18.00000 18.90110 19.49451 19.49451 7.71429 7.71429 7.71429 7.71429 7.71429 9.47253 12.54945 15.23077 16.83516 18.00000 18.90110 19.01099 19.01099 7.71429 7.71429 7.71429 7.71429 7.71429 9.47253 12.54945 15.23077 16.83516 18.00000 18.90110 19.01099 19.01099 7.71429 7.71429 7.71429 7.71429 7.71429 9.47253 12.54945 15.23077 16.83516 18.00000 18.90110 19.01099 19.01099 7.71429 7.71429 7.71429 7.71429 7.71429 9.47253 12.54945 15.23077 16.83516 18.00000 18.90110 19.01099 19.01099 7.71429 7.71429 7.71429 7.71429 7.71429 9.47253 12.54945 15.23077 16.83516 18.00000 18.90110 19.01099 19.01099 7.71429 7.71429 7.71429 7.71429 7.71429 9.47253 12.54945 15.23077 16.83516 18.00000 18.90110 19.01099 19.01099 7.71429 7.71429 7.71429 7.71429 7.71429 9.47253 12.54945 15.23077 16.83516 18.00000 18.90110 19.01099 19.01099 7.71429 7.71429 7.71429 7.71429 7.71429 9.47253 12.54945 15.23077 16.83516 18.00000 18.90110 19.01099 19.01099 7.71429 7.71429 7.71429 7.71429 7.71429 9.47253 12.54945 15.23077 16.83516 18.00000 18.90110 19.01099 19.01099
09-05-2006 | 07:29 PM
#27
Originally Posted by SUX2BU
It was. but at 75 mph it would pick up and then bogg down. it felt like it was pulling timing so i logged it with my tech 2 and it wasn't. the O2 readings were at like 100mv and they weren't bouncing back and forth like they should. they would jump to 900mv whenit felt like it was picking up. long story short it was starting up and idling good cause it was in open loop the whole time. got it to where it goes into closed loop again but now its having the same original problems. Brian is helpin me try to figure it out but i'de like to try to do it my self so i don't have to keep driving up there.
i do have a stock tune. to compare to. just don't know what to do.
Right now the #1 priority is to get it to start wihout having to play with the throttle and idle in nuetral/park without surging.
i do have a stock tune. to compare to. just don't know what to do.
Right now the #1 priority is to get it to start wihout having to play with the throttle and idle in nuetral/park without surging.
His tables look real good for what you need at first glance. Some fine tuning here and there once you get an idea of where the A/F is at once you make the changes his taken screen shots of.
09-06-2006 | 09:04 AM
#29
Originally Posted by kenkaru
I don't have any idle tuning tips but that post by LS1Sounds is pretty nifty with all the scrollbars and stuff. Never seen anyone do that before. 
Never seen anyone do that before. -Chad
09-06-2006 | 04:37 PM
#30
Originally Posted by LS1 Sounds
Try some of the following settings to cure the problems you are having at startup and low throttle.
-Chad
-Chad
09-06-2006 | 05:34 PM
#32
Surges pretty bad at idle and it'll start right up sometimes and not start at all other times. 
When i put it in gear (with my foot on the brake) it surges and actually rolls forwards during each surge untill it calms down.
When i put it in gear (with my foot on the brake) it surges and actually rolls forwards during each surge untill it calms down.
09-06-2006 | 09:16 PM
#34
Can you make a log of startup and idle during warmup, and send to chad AT dodds DOT cc? Use this config for logging:
http://ls1sounds.com/temp/Chad_Idle.cfg
http://ls1sounds.com/temp/Chad_Idle.cfg
09-07-2006 | 04:52 PM
#35
What about "IAC steps vs. Effective area" ?
This says to multiply it by 1.48. it that right? i have a TPIS 90 mm TB.
http://redhardsupra.blogspot.com/200...le-tuning.html
This says to multiply it by 1.48. it that right? i have a TPIS 90 mm TB.
http://redhardsupra.blogspot.com/200...le-tuning.html
09-11-2006 | 08:17 PM
#38
Originally Posted by LS1 Sounds
Can you make a log of startup and idle during warmup, and send to chad AT dodds DOT cc? Use this config for logging:
http://ls1sounds.com/temp/Chad_Idle.cfg
http://ls1sounds.com/temp/Chad_Idle.cfg
09-11-2006 | 08:54 PM
#40
sent.
I changed the RAF and raised the idle to 1100 so it would idle without surging. now it stummbles a little when i start it but it starts about 75% of the time by itself.
I changed the RAF and raised the idle to 1100 so it would idle without surging. now it stummbles a little when i start it but it starts about 75% of the time by itself.