FITECH EFI TUNING tips, info sharing, ideas, settings, etc... - Page 4 - Chevelle Tech
EFI Caution: Beyond here be monsters...

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post #46 of 2155 (permalink) Old May 3rd, 16, 1:13 PM
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Wayne
 
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Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

Quote:
Originally Posted by WHT/73 View Post
Battery voltage looks a little low for an engine running.
Mines at 14'ish and 13.8 when fans running.
In that pic the battery was showing a low voltage but it is usually around 13.6 volts. I was at idle in the garage and was doing some tuning and it got a little hot - alternator was hardly charging.

Anyway I richened up the AFR in the 3000 range and the pops are reducing a little but still present. I don't know how far to go so I will check the plugs again after a couple of more tests.

65-StingRay
Wayne
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post #47 of 2155 (permalink) Old May 4th, 16, 10:16 AM
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Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

Trigger a datalog when you are inducing the pop, then plot target AFR, AFR, and any other fuel items onto a chart. The displayed AFR on the screen has a filter, so it is slower responding. Trying to look at everything at once in addition to driving can be a bit challenging.

I had a slight pop on decel the other day, but I am really leaning out part throttle cruise.
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post #48 of 2155 (permalink) Old May 4th, 16, 10:01 PM
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Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

I've been checking on different forums trying to get info on Fitech tuning. On the Pontiac forum they seem to lessen the ex popping by adjusting the Decel open IAC to some where between -10 and -30. I think one of my Fitech call's I was given the same info of setting it to -30

Called Tech support and Bryce said to play around with fuel cut, no specific numbers but to raise MAP value that fuel cut returns injection. Also stated that EFI will pop out the ex and is normal.


I haven't got to confirming these change because it's been raining the past couple of days and looks like weather may break this weekend

Larry
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post #49 of 2155 (permalink) Old May 5th, 16, 6:58 AM Thread Starter
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Bob
 
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Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

I know Wayne has a stick car. Are you other guys getting popping with stick or auto?

I've never had, or heard a pop in mine, ever, but it's a sissy stick, aka automatic, lol.

Exhaust popping on decel is NOT NORMAL, but can surely be tuned out.

My daily driver truck, is tuned via HPTuners. I have the Decel Fuel Cut Off (DFCO) pretty aggressively to try and get a little better mileage. It definitely burbles and gurgles (like popping) on decel, when in DFCO mode...I'm thinking that must be what's happening, at least in Wayne's case.

Possibly having the DFCO in play for too long, and when it dumps some fuel to re-wet the cylinders as it's coming off/out of DFCO mode, it causes a pop due to the excess fuel.

I'm thinking maybe since I have an automatic, the DFCO related RPM drop isn't as severe, so not noticeable, or maybe not even there on my car???

Does that make sense to anyone?

1971 Chevelle SS "439" 2.1 tons of fun...
11.31@117 w/4.10's, 4200+ stall, QFT SS-830 carb
11.72@115 w/3.90's, 3300 stall, and Fitech GoEFI4
11.51@116 w/3.90's, 3300 stall, and Holley Sniper EFI
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post #50 of 2155 (permalink) Old May 5th, 16, 8:51 AM
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Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

I have a stick and now that you mention it it happens right before a stop. It's fine when you first downshift.

Maybe playing with Dfco return fuel will dial it out


Thx Larry
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post #51 of 2155 (permalink) Old May 5th, 16, 9:00 AM Thread Starter
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Bob
 
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Thumbs up Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

Quote:
Originally Posted by Grabberblu View Post
I have a stick and now that you mention it it happens right before a stop. It's fine when you first downshift.

Maybe playing with Dfco return fuel will dial it out


Thx Larry
Curious to hear what happens.

Please update us when you have tried it.

Between all of us, we'll figure this stuff out.

1971 Chevelle SS "439" 2.1 tons of fun...
11.31@117 w/4.10's, 4200+ stall, QFT SS-830 carb
11.72@115 w/3.90's, 3300 stall, and Fitech GoEFI4
11.51@116 w/3.90's, 3300 stall, and Holley Sniper EFI
rel3rd is offline  
post #52 of 2155 (permalink) Old May 5th, 16, 9:26 AM
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Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

ENGINE SIZE: 351 C '70 Mustang

FITECH SETUP USED:
GO EFI-4, 600hp NA setup w/timing control option

FUEL SYSTEM: Command Center


ENGINE VACUUM: 14


CAM SETTING 2 in 224* @ 0.050 534" lift, ex 234* @ 0.50 .539 lift 114 LSA

IAC COUNTS @ idle 5-9

TIMING CONTROL: Y/N? Y all in 3000 16* initial 36* total

IDLE RPM: 840

5 speed 3.70 rear


TARGET IDLE AFR:14


ANY ADJUSTED PARAMETERS & WHY:


Thanks, I guess you guys figured I'm from the other side but I think working together and sharing we can solve these problems.

Just got a 2016 Malibu for my wife, first Chevy ever!!!!

Thx
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post #53 of 2155 (permalink) Old May 5th, 16, 9:48 AM Thread Starter
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Bob
 
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Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

The Grabberblu name kinda gave it away...

You are 100% right though. The more people contributing, the better/easier it'll be for all of us.

I got a whole gaggle of American Iron in the shop that needs TLC...no brand specific stuff for me.
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1971 Chevelle SS "439" 2.1 tons of fun...
11.31@117 w/4.10's, 4200+ stall, QFT SS-830 carb
11.72@115 w/3.90's, 3300 stall, and Fitech GoEFI4
11.51@116 w/3.90's, 3300 stall, and Holley Sniper EFI
rel3rd is offline  
post #54 of 2155 (permalink) Old May 5th, 16, 10:25 AM
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Daryl
 
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Location: SE, MN 55912
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Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

Anyone having issues saving changes to the ECU? When I make changes and power down the changes do not show on start up. I can make changes to an off-line program and save it to a backup file and then load it to the ECU. Any thoughts? Thamks
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post #55 of 2155 (permalink) Old May 5th, 16, 10:27 AM Thread Starter
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Bob
 
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Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

Do you save after every change, or make multiple changes and then save?

I've had issues trying to save multiples, but never just one at a time.

1971 Chevelle SS "439" 2.1 tons of fun...
11.31@117 w/4.10's, 4200+ stall, QFT SS-830 carb
11.72@115 w/3.90's, 3300 stall, and Fitech GoEFI4
11.51@116 w/3.90's, 3300 stall, and Holley Sniper EFI
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post #56 of 2155 (permalink) Old May 5th, 16, 10:38 AM
BB
 
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Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

ENGINE SIZE:505 cu

FITECH SETUP USED: still stock default, trying to see what best fits my car

ENGINE VACUUM:6\7

CAM SETTING (1,2,3, or 4) AND YOUR CAM SPECS:using 3 but just because that is the option for street race cams

IAC COUNTS @ idle and cruise: Can't remember

TIMING CONTROL: Y/N?: N, I will be making adjustment as soon as my MSD HEi comes in.

IDLE RPM:950

TARGET IDLE AFR:14.0 brought it down to see if that would fix my cold start problem

ANY ADJUSTED PARAMETERS AND WHY?: None, trying to see who can make any suggestion, at the moment i'm flooding my plugs at start and sometimes I don't even get to start the car, also the car runs rich, very rich.

Any suggestions?
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post #57 of 2155 (permalink) Old May 5th, 16, 10:49 AM
BB
 
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Location: WARREN, NEW JERSEY
Posts: 4
Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

Wht, what do you think i should be looking at? I' running to rich and flooding my plugs at crank start, i dont even get to enjoy the car with this new system.
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post #58 of 2155 (permalink) Old May 5th, 16, 11:01 AM
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Dave
 
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Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

Quote:
Originally Posted by rel3rd View Post
I know Wayne has a stick car. Are you other guys getting popping with stick or auto?

I've never had, or heard a pop in mine, ever, but it's a sissy stick, aka automatic, lol.

Exhaust popping on decel is NOT NORMAL, but can surely be tuned out.

My daily driver truck, is tuned via HPTuners. I have the Decel Fuel Cut Off (DFCO) pretty aggressively to try and get a little better mileage. It definitely burbles and gurgles (like popping) on decel, when in DFCO mode...I'm thinking that must be what's happening, at least in Wayne's case.

Possibly having the DFCO in play for too long, and when it dumps some fuel to re-wet the cylinders as it's coming off/out of DFCO mode, it causes a pop due to the excess fuel.

I'm thinking maybe since I have an automatic, the DFCO related RPM drop isn't as severe, so not noticeable, or maybe not even there on my car???

Does that make sense to anyone?
I agree 100%. I used to get some popping out my exhaust on decel when I was first tuning on mine. (auto) Very annoying/embarrassing. While I run another system, where I don't have DFCO enabled, I think what it might boil down to is simply getting more data in those very-low kPA cells for the computer to learn from. I believe it is a rich condition for the particular RPM/kPA area and then the fuel is igniting in the exhaust, just as Bob says.

When you're getting these auto-tune systems first established, you want to drive in a way to hit as many of the cells in the table, as much as you can. More data = better learning. I've found long/steep hills to be very helpful, as you can easily vary/hold the load going up, and hit all the decel areas coming down. Run down the hill in 4th/top gear and come all the way down to 1000rpm before sliding in the clutch. Make another run down in 3rd or 2nd, to get the decel values for 3000+ rpm. Repeat as needed. It should eventually get tuned out.

-Dave
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'70 Chevelle ZZ383/700r4/3.55, 12.18@109 -- Megasquirt2-Extra, Holley Stealthram / Hotchkis A-arms / Hotchkis Springs / B-body 12" brakes / 1.25" F-body swaybar
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post #59 of 2155 (permalink) Old May 5th, 16, 11:13 AM Thread Starter
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Bob
 
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Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

Quote:
Originally Posted by BACARD1BB View Post
Wht, what do you think i should be looking at? I' running to rich and flooding my plugs at crank start, i dont even get to enjoy the car with this new system.
I'd be lowering CRANK and AFTERSTART FUEL by a decent amount.

Quote:
Originally Posted by ChevelleFan70 View Post
I agree 100%. I used to get some popping out my exhaust on decel when I was first tuning on mine. (auto) Very annoying/embarrassing. While I run another system, where I don't have DFCO enabled, I think what it might boil down to is simply getting more data in those very-low kPA cells for the computer to learn from. I believe it is a rich condition for the particular RPM/kPA area and then the fuel is igniting in the exhaust, just as Bob says.

When you're getting these auto-tune systems first established, you want to drive in a way to hit as many of the cells in the table, as much as you can. More data = better learning. I've found long/steep hills to be very helpful, as you can easily vary/hold the load going up, and hit all the decel areas coming down. Run down the hill in 4th/top gear and come all the way down to 1000rpm before sliding in the clutch. Make another run down in 3rd or 2nd, to get the decel values for 3000+ rpm. Repeat as needed. It should eventually get tuned out.

-Dave
Excellent advice Dave.

1971 Chevelle SS "439" 2.1 tons of fun...
11.31@117 w/4.10's, 4200+ stall, QFT SS-830 carb
11.72@115 w/3.90's, 3300 stall, and Fitech GoEFI4
11.51@116 w/3.90's, 3300 stall, and Holley Sniper EFI
rel3rd is offline  
post #60 of 2155 (permalink) Old May 5th, 16, 12:29 PM
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Chris
 
Join Date: Feb 2006
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Re: FITECH EFI TUNING tips, info sharing, ideas, settings, etc...

Listen to Bob.
That helped me too.
It would start then idle real low then catch back up.
Bob, you might have to explain how to get to that on the hand held.

73 nova,3515#(all steel)406ci N/A, best 1/4,1.45 '60,6.75@100.48,10.6 @ 122.38, short shifting,NO tuning!

http://www.youtube.com/watch?v=ng86PsGUcTY
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