80lbs rich at idle
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Joined: Nov 2005
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From: Lufkin TX moving to Canada
80lbs rich at idle guys i need some help on this car is 98 turbo sd tune swap to 80lbs HPI injectors so far i get 11.8 to 11.1 at idle i tried adjust transient, short pulse, and min pulse and it would jump up to 12.2 then jump back down to 11.5 steady 11.5 at idle i been searching around with this problem but seem like i cant narrow it down can you guys take a look at my tune see what i did wrong thanks in advance
fuel pump aeromotive 340 steal pump with -8 feed and -6 return car 224/224 112lsa cam running at 60 psi fuel pressure
fuel pump aeromotive 340 steal pump with -8 feed and -6 return car 224/224 112lsa cam running at 60 psi fuel pressure
Last edited by tsench; May 14, 2017 at 02:06 PM.
OK, you're in SD. Gonna need to do two changes. First, minimum fuel mg in transient is still too high. That's why you can't get out of the lower AFR at idle. Set it to something ridiculous like 0.002. 0.008 at the most.
After making that change, if you don't do the next step and you just try to start the car, it'll fire and then die immediately. So, in your maf table, set the first cell to 15 g/sec (check your units to be sure you don't do something like 15 lbs/min).
Should at least start and idle even if the AFR is really high. then, all your fuel trims will be all messed up from running the way it was, so in the scanner, clear your fuel trims.
After making that change, if you don't do the next step and you just try to start the car, it'll fire and then die immediately. So, in your maf table, set the first cell to 15 g/sec (check your units to be sure you don't do something like 15 lbs/min).
Should at least start and idle even if the AFR is really high. then, all your fuel trims will be all messed up from running the way it was, so in the scanner, clear your fuel trims.
Here is what I said in another thread. If you can't get it to idle, you'll need to "hack" your offset table. But that usually only applies to the 4.8s.
https://ls1tech.com/forums/pcm-diagn...se-tune-4.html
https://ls1tech.com/forums/pcm-diagn...se-tune-4.html
Thread Starter
Joined: Nov 2005
Posts: 820
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From: Lufkin TX moving to Canada
thanks guys for response
after i tried min fuel mg to 0.002 adjust maf a bit idle is nice and smooth but now i got up to 12.0 and drop back to 11.7 steady 11.7 im gonna try to clear my fuel trims and adjust VE table maybe 10%-15% see if i can regain my afr
after i tried min fuel mg to 0.002 adjust maf a bit idle is nice and smooth but now i got up to 12.0 and drop back to 11.7 steady 11.7 im gonna try to clear my fuel trims and adjust VE table maybe 10%-15% see if i can regain my afr
Injector Min-PW Hi, the above "tech" is the perfect way to cure your problem.
I would add, the manufacturer of the injector with model # ?
The Flow Chart from HPI ?
The Minimum Pulse Width from the EMS/the Minimum Pulse Width of the chosen fuel injector ?
Then to know that an INCREASE in fuel pressure can allow the injector to operate at a faster rate which allows a LOWER min PW with LESS net fuel injected.
Lance
I would add, the manufacturer of the injector with model # ?
The Flow Chart from HPI ?
The Minimum Pulse Width from the EMS/the Minimum Pulse Width of the chosen fuel injector ?
Then to know that an INCREASE in fuel pressure can allow the injector to operate at a faster rate which allows a LOWER min PW with LESS net fuel injected.
Lance
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I'm sure theres a reason, but your data doesn't match the excel file. The flow rates are at 97.7 all the way across, but the spreadsheet is showing 103 to 113 depending on where you are in the table. This will make you 10-15% rich before you do anything else. Remember - you're not commanding a certain flow rate. You're telling the computer what it is so it can calculate the pulsewidth in ms. lower flow rates make for higher pulsewidths and more fuel. The minimum and default pulse widths look like ID 850 injector data. You've got 0.152 vs their 0.725 in both tables. Likely not hurting. The short pulse adder tables don't match at all. If there is a reason that's one thing. If it's a mistake, it will all need to be fixed before you do much else.
The normal and bboundary injector timing is off. factory at warm temps is 5.55. Most guys end up in the 6.x range. Now, if there's a difference for turbos vs head cam, that's different, but that looks off to me as well.
Next, your boost enrichment is 1.26. Now, it may be a coincidence, it may not, BUT 14.7/1.26 is 11.7, which is right where you seem to be stuck. What is your idle MAP reading? If its over 110, you might be in boost enrichment. Might try zeroing that table out just to see if that makes it move at all. EDIT - not zero it out, but 1's all the way across.
Lastly, looking at the VE - I don't know for sure that i'd touch this until the injector data is right, but the VE in the 0-1200 columns looks high to me. I'd almost multiply by 0.9 and then blend from 1200-2000.
The normal and bboundary injector timing is off. factory at warm temps is 5.55. Most guys end up in the 6.x range. Now, if there's a difference for turbos vs head cam, that's different, but that looks off to me as well.
Next, your boost enrichment is 1.26. Now, it may be a coincidence, it may not, BUT 14.7/1.26 is 11.7, which is right where you seem to be stuck. What is your idle MAP reading? If its over 110, you might be in boost enrichment. Might try zeroing that table out just to see if that makes it move at all. EDIT - not zero it out, but 1's all the way across.
Lastly, looking at the VE - I don't know for sure that i'd touch this until the injector data is right, but the VE in the 0-1200 columns looks high to me. I'd almost multiply by 0.9 and then blend from 1200-2000.
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Joined: Nov 2005
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From: Lufkin TX moving to Canada
the reason the data doesnt match up what they sent me was they said the 80lbs and 96lbs using same data but require tweaking and using they data i got my afr sitting at 10.6 idle after changing the normal and boundary back to stock which at 5.55 and my MAP idle at 60-70 so im sure its not in BE im gonna take a look at the ID850 data and compare with the one i have see that make any difference
Thread Starter
Joined: Nov 2005
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From: Lufkin TX moving to Canada
ok guys after i change min pw and default pw to 0.125 also boundary and normal to 5.55 idle at 11.9 then i follow darth_v8r VE table multiply 0.9 and smooth out 1200 to 2000 now i got 14.6 to 13.8 at idle which flow rate set at 97.7 all the way so now im gonna plug in the data they original sent me and play around see if i can get that closer to 14.7
thank you guys for dealing with me really appreciated
thank you guys for dealing with me really appreciated
Thread Starter
Joined: Nov 2005
Posts: 820
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From: Lufkin TX moving to Canada
Thanks Darth
In the post I shared above, you can reduce your voltage offsets by 10-15% in the areas where the injectors idle. It's a shitty way to do it, but it gets you there.
Especially when you are in the teens in the VE table and it's still at 11:1 or something ridiculous on some 4.8Ls.
Especially when you are in the teens in the VE table and it's still at 11:1 or something ridiculous on some 4.8Ls.
If/when you bump your flowrates back up to match the excel sheet, you'll get really close to your target AFR. But you're pretty close now. At the point you are now, you should be able to start dialing in VE table. Fair warning, your VE on the high torque areas looks very low. SO be careful getting into high boost that you don't go lean. YOur boost enrichment is at 1.26, so if your AFR is showing 14.7, you're lean in those areas. Hope that helps
The thing where it starts up at one AFR and then sort of richens up to its final AFR has me wondering if the after-start enrichment has been disabled. I haven't looked into the tune for that, but I did notice you have all the AFR multipliers, etc set to 1, so I assume you got the afterstart as well.
Thread Starter
Joined: Nov 2005
Posts: 820
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From: Lufkin TX moving to Canada
I just re-read this and realized my reply didnt take...
If/when you bump your flowrates back up to match the excel sheet, you'll get really close to your target AFR. But you're pretty close now. At the point you are now, you should be able to start dialing in VE table. Fair warning, your VE on the high torque areas looks very low. SO be careful getting into high boost that you don't go lean. YOur boost enrichment is at 1.26, so if your AFR is showing 14.7, you're lean in those areas. Hope that helps
The thing where it starts up at one AFR and then sort of richens up to its final AFR has me wondering if the after-start enrichment has been disabled. I haven't looked into the tune for that, but I did notice you have all the AFR multipliers, etc set to 1, so I assume you got the afterstart as well.
If/when you bump your flowrates back up to match the excel sheet, you'll get really close to your target AFR. But you're pretty close now. At the point you are now, you should be able to start dialing in VE table. Fair warning, your VE on the high torque areas looks very low. SO be careful getting into high boost that you don't go lean. YOur boost enrichment is at 1.26, so if your AFR is showing 14.7, you're lean in those areas. Hope that helps
The thing where it starts up at one AFR and then sort of richens up to its final AFR has me wondering if the after-start enrichment has been disabled. I haven't looked into the tune for that, but I did notice you have all the AFR multipliers, etc set to 1, so I assume you got the afterstart as well.
Thread Starter
Joined: Nov 2005
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From: Lufkin TX moving to Canada
Ok I got almost got everything running smoothly but one problem when I release throttle thing going full lean and if I keep my foot on the throttle everything back to normal