EFI swappers, come inside
Thread Starter
|
Cargo Master
Joined: Apr 2010
Posts: 2,600
Likes: 64
From: Billings, MT
EFI swappers, come inside
Finished up my FiTech swap and have about 900 miles on. If ya missed my thread it's the FiTech 600 hp go EFI and in-tank pump setup from TanksInc. A few things. My engine vacuum is a lot lower, causing the trans to shift late and a bit hard. Any c6 users with some miles on?
Fleet Mechanic
Joined: Jan 2012
Posts: 1,668
Likes: 13
From: Saskatchewan
I'm no expert but I believe some of the vacume modulators are adjustable. Or set different according to the colour stripe on them. I'm sure somebody else will chime in here. Also what are you running for the kick down?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Dunno the vacuum before going to E-Street EFI but my '70 (360FE/TKO) has 18.4 Hg at idle with the timing set to OEM 6° BTDC.
What is your initial timing? Tweak it back to spec and it might increase.
What is your initial timing? Tweak it back to spec and it might increase.
Thread Starter
|
Cargo Master
Joined: Apr 2010
Posts: 2,600
Likes: 64
From: Billings, MT
Sorry, had to run out in the middle of my post, was on lunch break. Anyway, according to my data readout only pulling like 12" idle vacuum. With the 600 cfm holley had 15" at idle with the comp XE 262 cam. Haven't had time to verify that with a vacuum gauge.
The throttle body is 950 cfm...didn't know if freeing up the intake side that much would lose a few inches of vacuum. Don't belive I have a vacuum leak anywhere as I had to turn up the idle screw a bit to get the IAC motor counts inline. I'll double check next week.
The other issue is the fuel pump is dead with less than 900 miles on. Gonna do some testing, pull it apart and call TanksInc to see what they say.
The pump didn't sound like OE electric ones I'm familiar with from the beginning. More like a "groan" than the regular whine. I've never installed a pump in a '77 Ford so I waved it off.
The pump now sounds like a dying dolphin and only pumps enough fuel to run it at idle to 1/8 throttle
The throttle body is 950 cfm...didn't know if freeing up the intake side that much would lose a few inches of vacuum. Don't belive I have a vacuum leak anywhere as I had to turn up the idle screw a bit to get the IAC motor counts inline. I'll double check next week.
The other issue is the fuel pump is dead with less than 900 miles on. Gonna do some testing, pull it apart and call TanksInc to see what they say.
The pump didn't sound like OE electric ones I'm familiar with from the beginning. More like a "groan" than the regular whine. I've never installed a pump in a '77 Ford so I waved it off.
The pump now sounds like a dying dolphin and only pumps enough fuel to run it at idle to 1/8 throttle
Elder User
Joined: Sep 2014
Posts: 862
Likes: 7
From: like subarctic, brrr man!
Maybe figure a way to route and plumb a return line to help out the pump issue.
I have a long story about my VEMS dyi on my '78 4.9L. Basically what I did was, take everything as close to '96 ford truck to make efi work on my '78. so tanks wiring nylon fuel lines, etc... then graft that onto VEMS and it's custom sensors and *poof* madness!
edit: madness with VW Beetle Bosch Wideban O2 Sensor, to a Chrysler Minivan Wasted Spark Coil pack, and fancy expensive iridium platinum titanium uhm... fancy spark plugs (which still look new after 10k kms). And a gauge cluster fudge swap...
10/10 Would not recommend, would suggest getting a kit version!
I have a long story about my VEMS dyi on my '78 4.9L. Basically what I did was, take everything as close to '96 ford truck to make efi work on my '78. so tanks wiring nylon fuel lines, etc... then graft that onto VEMS and it's custom sensors and *poof* madness!
edit: madness with VW Beetle Bosch Wideban O2 Sensor, to a Chrysler Minivan Wasted Spark Coil pack, and fancy expensive iridium platinum titanium uhm... fancy spark plugs (which still look new after 10k kms). And a gauge cluster fudge swap...
10/10 Would not recommend, would suggest getting a kit version!
Last edited by ZarK-eh; Jul 28, 2016 at 10:29 PM. Reason: 10 years in the making!
New User
Joined: Mar 2016
Posts: 19
Likes: 0
From: New Hampshire
I put the same FiTech 600 hp on my 460 2 weeks ago. I have a 4 speed but I did not notice a change in vacuum. I have about 22psi at idle and thats what I had before the swap.
Where is the vacuum line hooked up for the modulator? Into the intake or into the FiTech?
What are you using for a kickdown linkage?
Are you running timing through the FiTech? Whats your base timing?
Where is the vacuum line hooked up for the modulator? Into the intake or into the FiTech?
What are you using for a kickdown linkage?
Are you running timing through the FiTech? Whats your base timing?
Trending Topics
Thread Starter
|
Cargo Master
Joined: Apr 2010
Posts: 2,600
Likes: 64
From: Billings, MT
I have an odd whistle at certain throttle angles as well. I must have a vacuum leak somewhere, working thru the weekend, more testing to come on my days off. Modulator vacuum source is the rear of the intake as it always has been and using an autoloc kick down cable. Tried kick down cable unhooked and problem persists.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
New User
Joined: Mar 2016
Posts: 19
Likes: 0
From: New Hampshire
The whistle may be the EFI. I noticed a hiss at idle and slight whistle at times during acceleration. I believe is the injector ports that make a whistle or hiss due to the high pressure fuel through all the tiny ports.
Not sure what your cam specs are but you must have some pretty serious overlap to have that low of vacuum. I'm not much on automatic trannys but I believe J Ballan is correct that some modulators are adjustable and the stripes do mean different vacuum ranges. I asked my buddy and he said the modulators with the black and red stripe are the lowest vacuum. If you cannot find any vacuum leaks, this may be the next option to try as modulators are cheap and easy to try.
Also, I have heard the FiTech troubleshooting department is very helpful. You may want to give them a call and see if they can explain the vacuum drop.
Not sure what your cam specs are but you must have some pretty serious overlap to have that low of vacuum. I'm not much on automatic trannys but I believe J Ballan is correct that some modulators are adjustable and the stripes do mean different vacuum ranges. I asked my buddy and he said the modulators with the black and red stripe are the lowest vacuum. If you cannot find any vacuum leaks, this may be the next option to try as modulators are cheap and easy to try.
Also, I have heard the FiTech troubleshooting department is very helpful. You may want to give them a call and see if they can explain the vacuum drop.
Thread Starter
|
Cargo Master
Joined: Apr 2010
Posts: 2,600
Likes: 64
From: Billings, MT
Back at this today as I'm cleaning all the dirt out of the fuel system. Thinking about it the throttle body and spacer are the only things changed during the swap that could cause the vacuum issue. I also find I had a timing parameter incorrect. I'll update. If the timing fix doesn't do it and I don't find a vacuum leak I'll remove the tb spacer and see what that does
Laughing Gas
Joined: Aug 2010
Posts: 896
Likes: 55
From: Bothell
I find it hard to beleve that you would have that low of vacuum with that cam. I'm running a 400 with a 4bbl edel carb and an edel cam with advertised durration of 282 int./292 exh and durration at .050 of 204 int./214 exh and it's pulling 22" at idel of 800 rpm. I would check for vacuum leaks, maybe an intake manifold leak.
Have you tried to time the engine with the vacuum gage and tach and not the timing light?
Have you tried to time the engine with the vacuum gage and tach and not the timing light?
Thread Starter
|
Cargo Master
Joined: Apr 2010
Posts: 2,600
Likes: 64
From: Billings, MT
Well as I said it did make 15-17" previously. I'm at about 3500 feet. Maybe I need to rig up a smoke machine to check for leaks. The edelbrock performer 400s require that sealing plate which I tossed in favor of the spacer. Maybe new spacer isn't getting along
Thread Starter
|
Cargo Master
Joined: Apr 2010
Posts: 2,600
Likes: 64
From: Billings, MT
And it was timing. Don't know what happened but what was supposed to be 10* initial was in fact like 6*. Initial is now set to 12* and the truck runs much better everywhere, shifts great and is purring. Must have been in a hurry to leave when I set it.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Refer to post #3.