Newbie and First Data Log
Hi All - I have a recently installed GoEFI 2x4 600hp system on a Ford FE 440 stroker motor. Erson roller cam, .595 lift 294/302 duration. Tremec T-5. Fuel system is Aeromotive Gen 2 340 Stealth tank and internal pump with a 3psi - 65 psi operating range. The shop that did the install has never done a Fitech before. I've run maybe 300 miles since and relied on info I could find online here, you-tube and other places to try to get the basic tuning sorted out. Out of the box I had major issues with cold start, warm start and throttle lag/cutting out, backfiring. A couple of days ago I spent a few hours trying to get the IAC set to the recommended steps, fiddling with the idle adjustment screws (Fitech tech support told me to back out both screws on both throttle bodies and start adjusting the drivers side master throttle body and then adjusting the other 3 same # turns until I got idle set and IAC steps where they should be.) I think I'm close, but still have some nagging issues. I got the IAC steps to jump between 0 to 3, 0 to 4, but never less than 0 and never above 6. I'm mostly happy with the cold start and warm start, but I can't get the car to idle at operating temp less than 1,050 - 1,100. I'm reluctant to keep messing with IA screws as it took so long to get the IAC steps in range.
At highway speeds I get pretty even, smooth throttle response when mashing accelerator and running through the gears from a dead stop. in 5th gear, 2,500 RPM I get hesitation when mashing accelerator and also exhaust popping when letting of pedal and decelerating from above 3,000 rpm. Don't seem to have throttle hesitation when mashing 3rd or 4th gear from 2,500 RPM, i.e., accelerating to pass.
I did log my most recent "test drive" and the log file is attached. But what does all this data mean????
My main issue is that I am not an automotive technician. I can do basic stuff, but I am not yet understanding AFR, and all the other parameters one can adjust via "pro tuning." If any of you or more experienced users can point me in the right direction, I'd be much obliged. I was hoping that maybe there were just a handful of critical data items that the dashboard logs that have a desired range, or min / max levels so that when I look at the data I've collected on my own car I can start to research what needs further adjustment.
Any help is appreciated.
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You are going to want to turn your idle screw out to get the IAC steps up. They should never go to zero. Need to adjust that at idle at operating temp. With your cam duration, your IAC steps should be about 20 I think would be good, but your vacuum indicates a mild cam at about 14 in Hg, which makes me wonder if the cam you described is even in there.
i am running the 2x4 power adder on a blown 545 my iac is between 4 and 10, I am on cam 2 with a 230/230 duration cam with a 114 lobe center fitech don't like 110 lobe center cams just fyi , I set my afr to 13/8/1 and dfco I cut in half and my prime I reduced by half the only issue I have is a small flat spot at 2ndary transfer and I am letting it learn from there but set your cam setting to the idle hg there is a chart on fitechs website, also that cam isn't going idle below 1000 rpm mine wont and I am running a 4000 stall and set your target idle to 950
my test drive
Thanks for the replies. I attached the spec sheet on my cam if that helps clarify anything for the more experienced members. Also, I forgot to ask/mention that the vacuum house was connected via a "T" to both throttle bodies. I've tried tuning the IAC steps and idle two ways; with the vacuum hose connected to both TBs, and disconnected/plugged to the slave TB. I have gotten much better start/idle results with the vacuum hose connected only to master TB. Does this sound correct? With vacuum connected to both TBs, I could never get IAC steps below 80, and cold start impossible without using throttle. Also wanted to confirm procedure for setting IAC steps (per fitech tech support) is engine off back all 4 adjustment screws completely out, then in until just touching the pivot that controls the intake blades. Engine running at temp, confirm TPS at zero, begin adjusting primary adjustment screw on master TB. If I get the IAC steps where I want, >3<10, by adjusting just the primary screw on master TBI, do I need to even mess with the secondary screw on primary side of master or either screw on slave?
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That makes sense now with 230/238 @ .05 My 268/284 @ .05 only gets about 5 in. Hg.
no adjust off of primary throttle body, secondary is just a slave, now is the cam according to the spec sheet a 110 lobe center or 114 lobe center, 110 will give issues you may half to live with, no I do not run my secondary screw the throttle bodies are tied together via dual carb linkage, as far as adjusting iac I did not unscrew 4 screws, once my throttle bodies were in sync with just the primary idle screw the linkage was installed and the slave screw was backed completely off, and iac was set using only the primary throttle body idle screw at 1/4 turn increments each time tuning key off and restarting and verify iac, then I set the target idle in the hand held to 950 and engine vac at 5 hg and below fitech has issues with its not enough engine vac.
Yeah, his vacuum is about 14 in. Hg, it's mine that is 5, but mine idles just fine with no issues with IAC set at 20. He ought to be able to use 5-10, but certainly not zero as is shown in his log file.
Thanks again to all replying, I greatly appreciate the help. The cam spec shows 114 intake center line and 110 separation angle. Any comments about vacuum hose connection to slave tbi?
plug off the secondary just use vac from primary get rid of (T)
Thanks again all for the replies and suggestions. I'll take another crack at setting the IAC steps and let you know how it all sorts out.