Can someone tell me which side of the integral airflow table is adding air and which side is subtracting? Seems to me the left side(negative axis) would be adding airflow? Also, would this be true for all e38/gen 4?
Can someone tell me which side of the integral airflow table is adding air and which side is subtracting? Seems to me the left side(negative axis) would be adding airflow? Also, would this be true for all e38/gen 4?
I think the left side adds airflow incrementally as RPM drops (x) amount below target idle.
--edit-- It seems I got this backwards as well
But also.. you should probably only adjust these as a last resort.
There are a lot of e38 idle threads to help you on your journey.
Last edited by TragicMike; 02-03-2024 at 07:21 AM.
Ive tried raising the side adding airflow and reducing the other side that reduces airflow like on the gen 3 stuff. Makes these gen 4 unhappy. Ive been having luck reducing the entire table by a percentage.
It's better to only mess with these as a final drivability thing and only then if needed. For reference the right side adds air. Left side takes it awayTo help myself visualize it, I always think of it like torque control even though it's air and throttle. For a positive rpm error it needs to take away. For a negative rpm error it needs to add. Smokeshow told exactly how idle is calculated in another thread - think it was the proportional and integral one.
Last edited by GHuggins; 02-02-2024 at 03:42 PM.
2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80
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I apologize i did not pay attention to the thread posted a couple days before i started this one. I had a truck with a awful surge in park i messed with the pi tables quite a bit in a gen 3 fashion, eventually set them stock and multiplied integral by a percentage(lowering the entire table). This fixed the surge and has on 2-3 more with a lot more minor surge, usually multiply by .7-.8 and do some interpolating fixes surge in p/n.
i have found that messing with the integral and prop will help with a smoother take off in manuals with decent cam/blower n such, i had it so it was more of me using the throttle feel which i like but then to help idle i set the integral and prop back to stock which helped idle BUT then if the clutch grabbed a little hard and pulled rpm down the throttle then blipped up higher on its own which i dont like as i also add a smidge throttle which usually is all it needs but with the both adding it it peaks up under that scenario too much making it then harder to take off smooth
I will remember that about the manual cars. A little throttle blip can go a long way on a blower car.
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