LS1 large cam heads wont idle Vindicator Cam
07-06-2023, 12:27 PM
#62
When you post a log, post the corresponding tune. That way we can see the effects of what you changed. To make it easier to keep track of, I put JH1, JH2 and so on with each tune revision and the same with the datalog. It's easier to keep track of and if you need to go back and reference a previous log, you know what tune goes with it.
I am still a little perplexed by the BRAF unless you have a vacuum leak, there is something off with the injector data or an issue with the TB.
Speaking of injector data, I didn't see the flow rate table listed in the data. Either I completely missed or I'm an idiot. Either are possible.
I am still a little perplexed by the BRAF unless you have a vacuum leak, there is something off with the injector data or an issue with the TB.
Speaking of injector data, I didn't see the flow rate table listed in the data. Either I completely missed or I'm an idiot. Either are possible.
07-09-2023, 11:58 AM
#64
The flow data on that spreadsheet is a little different than the tune you posted originally. I'm surprised they didn't provide it. Everything else looks to match the information they provided.
Have you been able to hook up the IAT sensor yet?
Have you been able to hook up the IAT sensor yet?
07-10-2023, 09:07 AM
#66
I emailed "Fuel Injector Connection" for the flow rate vs kpa values and txh0tb0i972 was spot on! Still don't know where he found the right values but kudos anyways! lol....
So i will update the values and log again...
New Flows
Injector Flow (g/sec) 6.984 7.027 7.070 7.113 7.156 7.199 7.241 7.283 7.325 7.366 7.407 7.448 7.489 7.530 7.570 7.610 7.650
Injector Flow (LB/Hr) 55.426 55.772 56.115 56.456 56.795 57.133 57.468 57.801 58.132 58.462 58.789 59.115 59.439 59.761 60.082 60.401 60.718
So i will update the values and log again...
New Flows
Injector Flow (g/sec) 6.984 7.027 7.070 7.113 7.156 7.199 7.241 7.283 7.325 7.366 7.407 7.448 7.489 7.530 7.570 7.610 7.650
Injector Flow (LB/Hr) 55.426 55.772 56.115 56.456 56.795 57.133 57.468 57.801 58.132 58.462 58.789 59.115 59.439 59.761 60.082 60.401 60.718
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LilJayV10 (07-14-2023)
07-10-2023, 11:10 AM
#67
Tune and log from today with updated fuel rate vs kpa. At the end after temp of 155 commanded absolute timing of 25 and seemed to have the lowest MAP value and best sounding idle.
Notes:
Still have a hanging idle and cruise control condition when in gear and driving.
Notes:
Still have a hanging idle and cruise control condition when in gear and driving.
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rickbat (07-31-2023)
07-29-2023, 12:02 PM
#69
Moderator
Even with @@txh0tb0i972 improvements, a still smoother idle spark table might help your idle. Your current table has abrupt changes from e.g. 20 degrees to 10 degrees which can cause hunting or stalling.
With big cams, I determine the g/sec used during idle and then set the entire spark table in that area to the same value; this reduces hunting. I find a value around 18-20 to work well as this allows the "Underspeed" table to add e.g. 10 degrees to prevent a stall. (If you enter too big a value like 30, the Underspeed table will not work and you may have stalling issues.) I then make sure the main spark table has the same value as the idle table to ensure a smooth transition.
I'm not an expert, but this has worked for me.
With big cams, I determine the g/sec used during idle and then set the entire spark table in that area to the same value; this reduces hunting. I find a value around 18-20 to work well as this allows the "Underspeed" table to add e.g. 10 degrees to prevent a stall. (If you enter too big a value like 30, the Underspeed table will not work and you may have stalling issues.) I then make sure the main spark table has the same value as the idle table to ensure a smooth transition.
I'm not an expert, but this has worked for me.
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rickbat (07-31-2023)
07-31-2023, 06:53 AM
#70
Thanks guys! I have not given up getting the car tuned just had a foot injury putting me back a few weeks. Hard to hobble around the shop right now so i guess pun intended, i have been stalled out.... 
FML....
Will update this post hopefully soon as i can make more progress Way I'm going car wont be on the road till next year grrrrr...........
FML....Will update this post hopefully soon as i can make more progress Way I'm going car wont be on the road till next year grrrrr...........
07-31-2023, 02:35 PM
#71
I don't think it has been mentioned yet, but the spark over/under speed tables could also stand to be reigned in a bit. If you watch the spark during the log you can see it is all over the place. That could mean that there are still other issues with the tune-like the VE table not being tuned properly in the idle areas... but the PCM is constantly pulling timing, then adding it back in, and it's just all over the place. I like to limit those tables so that they can't remove so much timing, nor can they add it in the event that the engine rpm falls below commanded. Once the tune is sorted, this won't be an issue and makes for a very smooth spark line as viewed in the log in the running chart along the bottom of the scanner window. When that white line is as choppy as yours is in that log.. It's telling you that you still have some work to do. When the fueling is right, the spark will, or should, settle right down depending on how big the cam is anyway.. Even with a large cam, reigning in the over speed and underspeed table can stop the massive timing swings. I also tend to like a little more spark advance at idle with a performance cam. I typically run about 24 degrees. I tried to edit the last tune posted with the changes that I like but could not save it.. I know some people can edit tunes posted here in the forums, and then put them back for review. I still have not figured out how to do that... anyways, I'm following along intently as I'm enjoying the way the thread is going. Sorry to hear about the foot setting you back. Keep at it! We are all rooting for you!
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rickbat (07-31-2023)
07-31-2023, 08:49 PM
#72
Moderator
@Kawabuggy is making a great suggestion that may also work for you. Might have to try it myself.
I found that my camed engine makes the best vacuum with about 30 degrees of advance at idle of 1000 rpm. I then set the idle spark table, for the entire area where it idles, at 20 degrees and allow up to 10 degrees on the Underspeed table to reach a max of 30 degrees if needed.
Sounds like @Kawabuggy is setting a max of about 6 degrees in the Underspeed table and setting the idle spark table to 24 degrees. Assuming those are his numbers, it comes to the same max of 30 degrees that works for me.
Rick, hopefully you can give this a try and won't need to hobble around too much. I would be happy to edit your tune for you, but would need to know what g/sec you engine idles at. Or perhaps Kawabuggy or one of the other experts here could do it even better than me.
I found that my camed engine makes the best vacuum with about 30 degrees of advance at idle of 1000 rpm. I then set the idle spark table, for the entire area where it idles, at 20 degrees and allow up to 10 degrees on the Underspeed table to reach a max of 30 degrees if needed.
Sounds like @Kawabuggy is setting a max of about 6 degrees in the Underspeed table and setting the idle spark table to 24 degrees. Assuming those are his numbers, it comes to the same max of 30 degrees that works for me.
Rick, hopefully you can give this a try and won't need to hobble around too much. I would be happy to edit your tune for you, but would need to know what g/sec you engine idles at. Or perhaps Kawabuggy or one of the other experts here could do it even better than me.
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rickbat (08-01-2023)