Trying to get a more stable idle. Tends to dip down low, especially when pulling out of gear to neutral coasting.
Idle Airflow tables are stock only thing updated was the ETC Scaler for the throttlebody. Attached is my latest tune and scan.
the GTO is stock, stock shortblock, stock top end.
HMS VE & MAF Tuned for Light street use.hpt
drive test tune.hpl
Bump up min airflow maybe 5 or 10% and see if it gets any better
ETC scaler should be something more on the lines of 7200 for the NW102 too...
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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Originally Posted by schpenxel
Thanks for the advice. I will try it out and post results ASAP.
is there a method for calculating the true ETC value for this throttlebody? Or is it just a guessing game? I will try your value and test both modifying the ECT Scaler and/or the MIN Airflow tables to see separately to see which gets me closer to my desired idle quality.
As far as the ETC Scalar for the NW 102mm, some have suggested a formula using the area of a circle less the area blocked by the throttle blade shaft:
ETC SCALAR AREA 102mm = [(pi*51*51)-(10*102) = 7154.571429)]
PI 3.142857143
Bore 102.00 Half = 51
Total Area 8174.571429 8174.571429
Shaft (10mm) 1020.00
Net Area 7154.571429
I am using 7150 in my tune (I have the NW 102mm also).
The Airflow Final Minimum values take a little tuning sometimes. In short, if the values are too high, your car will run as if on cruise control. It may even accelerate (as I found out). If the values are too low, the car will stall at idle speeds in park or neutral, and it will slow down unusually quick when coming off the throttle down the road. The Airflow Final Minimum values act like a idle speed adjustment screw on an old school carburetor...
Hope this helps
Last edited by scottt28; 01-08-2017 at 10:54 AM.
I use 6800 on the NW102. It acts way more predictable that way.
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