calculating FN348 crank PW-ECT modifier

Decipha's custom GUFX strategy covers all 89-93 foxbody ecu's including the 88 mass-air california ecus.
canuck1
Posts: 67
Joined: 2021 Mar 31, 17:29
Location: Victoria, BC CANADA
Vehicle Information: QH, TunerPro RT 5, GUFX_220418.xdf, A9L2_220405, DECIPHA_220505.ADX, 395w, AFR 195CC Renegade heads, Comp XE274HR cam, Siemens-Deka V 80lb/hr (shorties), Mass-Flo-EFI style 4bbl throttle body with GM maf on top. Custom long tube headers, sidepipes, 5 spd manual.

calculating FN348 crank PW-ECT modifier

Unread post by canuck1 »

When modifying the default (A9L2) y axis values for FN348 ( 19/(new injector size) * (new engine size)/302=0.xxx Apply that 0.xxx correction to the entire y axis.) am I supposed to use the nominal high slope injector size I am using (80 lb/hr at 39.15lbs FP) or the FP adjusted size? Should I insert the FP adjusted high slope of 89.309 or the nominal 80 lb/hr into the equation? Does it matter? If not, please explain.

Sean

Edit: corrected FN # in title.
decipha
Posts: 4957
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: calculating FN48 crank PW-ECT modifier

Unread post by decipha »

always use actual values
canuck1
Posts: 67
Joined: 2021 Mar 31, 17:29
Location: Victoria, BC CANADA
Vehicle Information: QH, TunerPro RT 5, GUFX_220418.xdf, A9L2_220405, DECIPHA_220505.ADX, 395w, AFR 195CC Renegade heads, Comp XE274HR cam, Siemens-Deka V 80lb/hr (shorties), Mass-Flo-EFI style 4bbl throttle body with GM maf on top. Custom long tube headers, sidepipes, 5 spd manual.

Re: calculating FN348 crank PW-ECT modifier

Unread post by canuck1 »

I read the write up section regarding cranking PW and saw that it’s common to be +/- 25% of the calculated y axis adjustment and that it’s normal to require further tuning to correct warm/hot start issues.

What other parameters can affect warm/hot start? My tune seems to need considerably more than + 25% over the calculated y axis (Msec) value to start with ECT above 180 degrees.

How much is too much in terms of Msec of cranking PW?

Sean
Post Reply