Decapped Stock Injectors

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Decapped Stock Injectors

Unread postby SlowBox » Fri Dec 23, 2016 11:02 am

A year ago, I found a second set of orange F6VE type III 19lb-ers sitting in a junkyard Crown Vic someone had snatched the intake out of. They were staring me in the face, so I brought them home and attempted to copy some Subaru guys I saw on the web and remove the diffuser plate they come stock with. Basically, the EV6 19s (and 24s, 30s, and EV14s, etc.) are flowed via a precision drilled plate laser welded over the top of the pintle. If you remove that plate, then the injector free flows in the open position. Since the pintle is recessed, I used a small, green, cone shaped grinding bit in my Dremel to VERY CAREFULLY go around the very outside of the weld. Once I saw a crack appear in the plate, I was able to use a safety pin to remove it. After I cleaned them, I installed them and got to dialing them in.


These stock 19s now flow 55 pounds on the high slope, and 59 pounds on the low slope. There's more to it than just that, though. The injectors now have a pretty wide spray pattern, which isn't a bad thing, but it needs to be taken into account in the tune by adding a little transient fuel and accel fuel. If you don't, you'll get a lean misfire or backfire when you change throttle positions.

In the last few months, some GM guys on the internet have put in some serious time decapping their injectors and having them flowed. Some are seeing over 80lbs out of a factory FlexFuel injector and making big power with them, even on E85. I've tested my car with what ended up E65 after it mixed with what I had in the tank, and could only manage 47% INJDC so it's unlikely I'll ever have to upgrade injectors, even with a dry hit or the On3 kit I'm planning.
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SlowBox
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Vehicle Information: 1989 Mustang GT
4r70w, 3.73
GT-40P heads
Alex's Parts springs
Stock cam
9.7:1
GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
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Moates QH v1.6

Re: Uncapped Stock Injectors

Unread postby decipha » Fri Dec 23, 2016 5:58 pm

pretty cool, i dont see how the injector offset would be affected though

injector offset doesnt change with scaling

the crank pw and aem and mteisf is specific to the setup, a blanket adjustment wont be accurate for just an injector swap, woupd be best to post the prrcentage you had to kick those up

you said your injector flows 52 and 55? Are you referring to the slopes? The low slope should be higher than the high slope, what did your exact slopes come out to be?

same applies for the crank pw

I would be interested to see how the set flows on a bench to see the variance between each injector

in any case this sounds like an excellent upgrade for free cheap, i can snatch 19s all day long in the yards for next to nothing
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Re: Decapped Stock Injectors

Unread postby SlowBox » Fri Nov 17, 2017 8:22 pm

Little update. Found my maf curve was low compared to posted Ford data. These injectors flow 60 lbs/hr.
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SlowBox
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Posts: 518
Joined: Sat Jan 09, 2016 2:15 pm
Location: North Texas
Name: Troy G
Vehicle Information: 1989 Mustang GT
4r70w, 3.73
GT-40P heads
Alex's Parts springs
Stock cam
9.7:1
GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
TunerPro v5
Moates QH v1.6

Re: Decapped Stock Injectors

Unread postby decipha » Sat Nov 18, 2017 10:46 am

nice, sounds like an even better upgrade lol

my biggest concern would be cylinder to cylinder though, on a higher hp engine that cyl to cyl afr could make or break the engine
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Joined: Mon Jul 15, 2013 5:29 pm
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Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: Decapped Stock Injectors

Unread postby SlowBox » Sat Nov 18, 2017 1:11 pm

There's a guy on the Decapped Injectors fb page and Sloppy Mechanics named Eric Derr that bought a bench to flow injectors out of his garage. He charges $60 for 8, cleaned, flowed, and rebuilt with new filters and o-rings. I plan on sending him at least two complete sets of decaps so I can have a nice, even set to put in the car so I don't run into issues with nitrous or an on3 kit.
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SlowBox
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Posts: 518
Joined: Sat Jan 09, 2016 2:15 pm
Location: North Texas
Name: Troy G
Vehicle Information: 1989 Mustang GT
4r70w, 3.73
GT-40P heads
Alex's Parts springs
Stock cam
9.7:1
GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
TunerPro v5
Moates QH v1.6

Re: Decapped Stock Injectors

Unread postby yeastieBoB » Sun Nov 19, 2017 9:06 pm

Pretty damn cool!
'93 coupe, stock internal 302, PMAS HPXE 3.5 MAF, 75 TB, Victor 5.0, High Ports, Deka 80 lb inj., 255 pump, B303, 1.6s, Tremec 3550-2, 4.10s, full exhaust, Moates QH v1.6.Q, TunerPro RTv5, X3Z/A9L2/GUFX. Mostly untuned stock bin went 12.68 @ 111.69.
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Vehicle Information: '93 Reef Blue coupe. Stock internal 302, PMAS HPXE 3.5 MAF, 75 TB, Victor 5.0, High Ports, Siemens Deka 80 lb/hr inj., B303, 1.6s, Tremec 3550-2, & 4.10s. Cobra EEC mostly untuned went 12.68 @ 111.69 with Pro-M 80mm MAF and 30# inj.
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