Re: [GMCnet] Calling all FiTech Fuel Injection Owners...

[jhb1]

Ansers in Caps not yelling

quadracerx1 wrote on Sun, 23 April 2017 03:18
> Hi...
>
> For those of you running the FiTEch Injection, I have a couple questions...
>
> How do you like it?
>
> I LOVE IT
>
> How long have you had it?
>
> OVER 1YEAR 8500 MILES
>
> How long did it take to "learn"?
>
> ABOUT 200 MILES WAS WORKING GREAT AFTER 10
>
> Is the least expensive Go Street EFI- 400 HP System the recommended unit? OR is the Go EFI 4- 600 HP System better for our coaches because of the
> timing control?
>
> 400 WASN'T AVAILABLE
>
> Would you do it again?
>
> IN A HEARBEAT
>
> Thanks,
>
> Steve


--
John H. Bell
77 Royale; QuadBag,Manny OneTon,Honda EV4010, FITech
Montreal Qc.

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[Wally Anderson]

quadracerx1 wrote on Sat, 22 April 2017 22:18

> Hi...
>
> For those of you running the FiTEch Injection, I have a couple questions...
>
> How do you like it?
>

> How long have you had it?
>

> How long did it take to "learn"?
>

> Is the least expensive Go Street EFI- 400 HP System the recommended unit? OR is the Go EFI 4- 600 HP System better for our coaches because of the
> timing control?
>

> Would you do it again?
>

> Thanks,
>
> Steve

On Facebook there is a GMC group about FiTech on GMC's
https://www.facebook.com/groups/GMCMHFiTech/

--
Wally Anderson
Omaha NE
75 Glenbrook
Megasquirt III injection
Bob Stone hydroBOOOOST
Manny reaction arm system
Branscombe Kelsey Hayes park brake
http://wallyandsue.blogspot.com/

[Kelvin Dietz]

>For those of you running the FiTEch Injection, I have a couple
questions...
>> How do you like it?

Works as advertised.

>> How long have you had it?

Only have about 500 miles on it.

>> How long did it take to "learn"?

Poor thing was very confused for the first couple miles. After a 15
miles test run it was doing pretty well. No idea how well it has
learned since then but it works much better than my less-than-perfect
GMC Q-jet.

I'll be putting it to the test this summer. I have a 7000ft pass to get
over in August.

>> Is the least expensive Go Street EFI- 400 HP System the recommended unit? OR is the Go EFI 4- 600 HP System better for our coaches because of the timing control?

I went with the 400HP. I'm running a Dick Paterson distrubutor and was
told it would work just fine with the FiTech.

>> Would you do it again?

Yup. Reasonable price and haven't had any problems. I think the
biggest complaint has been their customer service. I haven't needed it
much but others have had issues.

Kelvin
'73 23' in Eugene, OR

[Skip Hartline]

I like it,I got the 600hp because of the edlebrock top end I have. As I was told don't expect better milage unless you were running super rich before.
Mine learned itself in in a matter of a few minutes, the biggest problem I've ran into is the throttle linkage is super stiff with the springs from
the factory they are right on the throttle shafts. I went on some camaro forums and did what they suggested make sure and use the outermost hole and
release the spring on what I would call the secondaries but they really aren't because all 4 open at the same time, then put you original springs or
some fron the "help" aisle at the auto parts store, you don't notice them like you do the second spring fron the factory. My linkage wasn't exactly
stock so you might not have any issues. In the outermost linkage hole you can't get full throttle plate opening but I don't think it would ever be
needed, at least for me it isn't. I'm using the fuel command center and put it in the front of the right side of the radiator like another member of
the forum suggested, It was Gerald Work he did a whole presentation on the install. You probably can search the forum or ask him directly for a copy
of it. I can't seem to find it right now. Haven't got to try it out in real vapor lock scenarios but it isn't suppose to do it at all, and all the
great cold starting the no hesitation acceleration and general overall clean burning I've got now it is well worth it. Climb some small mountains in
Georgia with a toad running only on 7 cylinders didn't even realize it till I got back home and did some checking. Just my observations and ideals,
most of the ideals are by others but pride went out the window a few years ago, remember "if there is a better ideal out there don't be to proud to
use it, but be sure and give credit where credit id due"

Skip Hartline

[gene Fisher]

Read here
https://docs.google.com/viewerng/viewer?url=http://gmcws.org/blog/wp-content/uploads/GMC-presentation-FiTech-is-the-Real-Deal.pdf

Most gmcws are busy at the rally

On Sun, Apr 23, 2017 at 2:48 PM Skip Hartline <sk...@hartlinealarm.com>
wrote:

--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html

[gene Fisher]

Or read here
http://gmcws.org/blog/?p=4332

(Damm computers 😀

[Kelvin Dietz]

>Mine learned itself in in a matter of a few minutes, the biggest
problem I've ran into is the throttle linkage is super stiff with the
springs from the factory they are right on the throttle shafts. I went
on some camaro forums and did what they suggested make sure and use the
outermost hole and release the spring on what I would call the
secondaries but they really aren't because all 4 open at the same time,
then put you original springs or some fron the "help" aisle at the auto
parts store, you don't notice them like you do the second spring fron
the factory. My linkage wasn't exactly stock so you might not have any
issues. In the outermost linkage hole you can't get full throttle plate
opening but I don't think it would ever be needed, at least for me it
isn't. I'm using the fuel command center and put it in the front of the
right side of the radiator like another member of the forum suggested, <

Going to have to look into this some. I had the same problem with a very
stiff throttle. Impossible to "roll on" the gas smoothly. I modified
the hell out of the stock cable-holding bracket to give myself a pretty
good feel.

I might look into your spring options to improve it just a bit more.
It's still just a tad stiff just off idle. Pics of that mod would be
useful.

Kelvin
'73 23' in Eugene, OR

[Bob Schilling]

I've had the FiTech 600hp for about a year. It learned quickly and has been trouble free. I had a mechanic install mine and he has been so impressed,
he ordered the high performance FiTech for a hot rod Nova he is building. Actually he applied to be a distributor for FiTech in our area, but was told
there was already some one here. I believe that is pretty strong testimonial to the quality of this system.
--
Bob and Pam Schilling
Rapid City, SD
"78 Royale

[Bruce Hislop]

Just wondering how the FiTech manages the fuel with such a small fuel table (3x3 or 4x4 I believe). The example in their manual shows a straight-line
extrapolation in between.

These are a couple curves my my low and hi-speed EBL tables from way back in 2009. I don't have any current tables on-line.
http://www.gmcmhphotos.com/photos/member-galleries/p30956-ve-table-graph-from-dynamic-efi-ebl-system.html
http://www.gmcmhphotos.com/photos/member-galleries/p30957-ve-table-graph-from-dynamic-efi-ebl-system.html

My spark table is a curve as well were it seems the FiTech would be straight-line.

Just wondering..
--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
Hubler 1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

[Gerald Work]

Hi Bruce,

What I have learned from FiTech and from my own now rather extensive experience is that they appear to be calculating on the fly the actual target A/F ratio based on those simple base tables plus input from a number of the other sensors all vetted by feedback from the o2 sensor from each ignition event or series of events. While the interpolation appears to be linear, the constantly changing multiplier factors assigned to the other sensor inputs and the constantly changing base table A/F ratios as a result of the o2 sensor feedback looks to me to be shifting those linear interpolations to mimic curves. The microprocessors now available are that fast unlike the ones from a decade or so ago.

The self learning appears to be heavily influenced by o2 sensor feedback which gradually alters the base table settings and the multipliers used for readings from the other sensors. Randy V. found that by manually changing the base table settings from the very rich FiTech ships with to leaner and more appropriate for our use 14.1 to 14.5 starting points that the self learning comes in more quickly as there are apparently smaller adjustments called for from the o2 sensor. That matches my experience as well.

At first I just let the system do its own thing on its own time frame and it worked well, but seemed to me to generally be rich at first and gradually began to lean out. At Randy’s suggestion I leaned out the base table settings for idle and mid- range (just two numbers with are easy to find and change using just the included all metal color display) and my unit(s) seem to come more quickly to the learned leaner A/F ratios our engines appear to prefer to the richer stock settings the FiTech ships with. I would leave alone anything to do with WOT as I want my engine to consume as much fuel as it wants to keep it cool in steep pulls. I never actually go to WOT and always keep 4” or so of vacuum even on the steepest of grades to help keep things cool and keep all the pieces where they are supposed to be.

I have written a lot of computer code in my working life, but have never calculated or created algorithms for multi-sensor A/F ratios so really can only speculate about how the FiTech algorithms might be working, but my speculation thus far matches well my direct personal experience. I do think we have to be careful not to advance the base timing too much in hot driving as I think the combination of constantly recalculated A/F ratios, hot driving and long mountain pulls could result in overly lean conditions in some circumstances. In cooler and less demanding driving the constant recalculated A/F ratios do a good job of improving drivability even in the face of too much initial advance. I am not sure the EBL systems would catch these conditions for us so advise setting base timing a degree or two less than you think you can get away with under more normal driving conditions. Hope this helps.

Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR

glw...@mac.com
http://jerrywork.com

===============
Message: 2
Date: Mon, 24 Apr 2017 14:42:50 -0600
From: Bruce Hislop <br...@perthcomm.com>
To: gmc...@list.gmcnet.org
Subject: Re: [GMCnet] Calling all FiTech Fuel Injection Owners...
Message-ID: <4d486.5...@gmc.mybirdfeeder.net>
Content-Type: text/plain; charset="utf-8"

Just wondering how the FiTech manages the fuel with such a small fuel table (3x3 or 4x4 I believe). The example in their manual shows a straight-line
extrapolation in between.

These are a couple curves my my low and hi-speed EBL tables from way back in 2009. I don't have any current tables on-line.
http://www.gmcmhphotos.com/photos/member-galleries/p30956-ve-table-graph-from-dynamic-efi-ebl-system.html
http://www.gmcmhphotos.com/photos/member-galleries/p30957-ve-table-graph-from-dynamic-efi-ebl-system.html

My spark table is a curve as well were it seems the FiTech would be straight-line.

Just wondering..
--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
Hubler 1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

==================

Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR

glw...@mac.com
http://jerrywork.com

[Gerald Work]

Bottom line to all these interesting posts for me is how successful Fitech has been shipping the same unit to so many different applications of engine sizes, states of tune, cams, gearing, vehicle weights, driver expectations, driving conditions, etc. How they have been able to make one system with one set of algorithms work across all those very different circumstances is a real testament to todays microprocessor and sensor technology and their approach to making it all work from one product platform. My hat is off to them.

Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR

glw...@mac.com
http://jerrywork.com