Decapped truck injector 4.8 5.3 6.0 flow test 69#
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- Опубліковано 7 лип 2017
- Actual static flow test of 4 injectors:
Stock truck 2 hole cap
Stock truck 4 hole cap
Stock truck decapped
eBay 80#
Very interesting results validating the flow of the modified decapped injector and the 80#
We verified the reason our test shows the 80# flowed 104# was our Test pressure of 58# was higher than the 42# the seller shows.
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/ headflowinc - Авто та транспорт
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I'm shot because when you made this video I never realized how great it was. It's great because you don't have to mail away nothing. Great stuff. Just going over your video's making my LS list getting ready.
Cool test.
Ok thx for the break down
You dont need to buy cc'ed beakers, you can use a mixing cup for cooking , transfer the amount over to clear containers and mark the cc amounts on those containers. This should be done before you run the injectors anyway to make sure you dont have a weak injector, unless you like holes in a piston.
Good vid
In most of my b and h series Hondas that are around the 550 wheel hp I'm running decapped 5.3 injectors since their e85 compatible. They work flawless.
I’m running decapped 25.2# truck injectors that flow +- 74# in my Turbo 4.8 LS. If/when I upgrade to more boost I’ll decap a set of the “Flexfuel” injectors which flow way more like 88# or something crazy.
It makes sense that both the 2 hole and 4 hole injectors would be the same. If you needed a replacement you may get either one from the store and if the flow was different then that cylinder would be richer or leaner than the rest. Causing other issues in performance.
It would be interesting to test a bunch of decapped injectors to see how consistently they flowed over a large group
FSM for 02 Silverado warns that, when replacing individual injector(s), you have to match p/n and/or reference old injector visually. So it seems that, while what injector came stock could vary either from location or specific date of manufacture, it still is necessary (or, advised)
So i just had 2 stuck injectors on my 03 silverado 4.8 stock injector has 2 hole cap buddy lent me 2 of his 4 hole cap truck runs beautiful now for about 5-10 min then she just floods out 2 cylinders i out the 4 hole caps in. But this video shows they flow the same ?
On a 5.3 v8 vortex, would it run good with 22psi injectors ?
Antoine Taylor 22# injectors are small, it would need to be a stock low rpm type build. Non-performance
The 24.8# and 25.2# truck injectors should be fairly easy to find depending on where you live.
Injector scale in the tune is also a concern. JD
What calibration fluid were you using and what was the specific gravity?
lol you talk like we knew what we were doing! This is a cheap shade tree see if it works setup. I’m not sure what Richard used for fluid but it may have been denatured alcohol. Maybe 🤔
Richard ended up buying one of the eBay fuel injector flow/cleaning benches and even it is difficult to get consistent flow numbers from. We decapped a set of the truck 25.2# injectors and flowed them on the eBay bench, it took several sets to end up with a decently matched set of 74# injectors. Honestly, we had one all star performer injector that was a few # higher I stuck it in cylinder #7 since it’s the one who’s famous for injury! lol JD
Can I run a decapped flex fuel injector on a 2002 suburban ? Planning on putting a turbo set up soon. Thanks for the video.
D&D Operations The flex fuel decapped flow like 85-88#
The important thing is to flow as many injectors as it takes to make sure they all flow the same.
I wouldn’t just decap and install without flowing.
Thanks for the feedback I hope this helps! JD
HeadFlowInc awesome thanks for your help
can you test an FMU flow vs stock
Tyler Merkley Richard built this fixture purely as a way to compare the flow change with decapped injectors. If you want/need injectors cleaned/flowed contact Eric Derr he’s very reasonable.
Eric Derr DERR Injector Service Derrmain@twc.com (502) 381-4678. Great guy, great prices,
So what did you do far vacuum on the regulator to work
I run the factory truck fuel rail, fuel pressure regulator and vacuum line connection. My fuel pressure was set by my Walbro 525 lph pump at 60#.
I’m currently changing to the Walbro 535 lph e85 pump so I’ll see what the factory preset is then go from there.
Note: I have my decapped truck injectors entered as 74# in my tune on my Turbo 4.8
Not sure if there is difference but how about LS7/LS9/LSA injectors de capped
We’ve never tried it, not all injectors can be decapped. I’m running decapped 25.2# truck injectors in my 4.8 Turbo flowing 74#; they run great very smooth and easy to tune.
When I upgrade my injectors I’m hoping to use decapped flex fuel injectors from a truck.
I hope you check out my channel and subscribe. JD
I have a question! Can i put a 4.8 injectors on a 5.3 ?
You can, but they’re probably smaller. The early 4.8 came with a 24.8# injector when the 5.3 came with 25.2.#
Friend of mine got 4 sets of LS injectors and decapped/flow matched them untill they had 8 that was almost identical. Used a similar setup to the video anyway. On a 160$ Ebay turbo truck hauls ass I have to say. For the money its actually ridiculous
Will Spicer I’m currently trying to build the same thing, cheap as possible $156.00 GT45 Turbo!
Thanks for the feedback I appreciate you watching! 👍 JD
For affordable but reliable injectors look at Snake Eater Injectors. I have a couple friends who are running them and all are happy for the $. Ik some injectors can get up ridiculously high
Will Spicer I saw Snake Eater just came out with some 80-85# injectors, plenty for what I’m trying to build. Thanks again I appreciate it! JD
Thanks for the info!! I’ll get my injectors there!
What year vehicle is the uncapped one? Is it from a 6.0L engine And what's the CC's after decapping
Don Woods The decapped injectors was the same Truck injectors, No e85, injectors they used on all 4.8, 5.3, 6.0 as far as I know. Iirc the decapped injectors flows 70 gph.
Don Woods oops, truck injectors 2000-2005
Are these the Delphi 25lb
Don Woods Yes, factory truck 24/25# injectors except the one eBay 80#.
Would these be close to 1000cc injectors?
A couple of things or maybe three- what test fluid are you using if that’s gasoline I have some safety concerns the orifice plate doesn’t matter what how many holes are the rating of injectors a reading of the injector or yams use your first plate for aiming the fuel stream and fuel administration I be concerned about the capping injectors you increase the flow at wide-open by double now the turn down ratio’s gonna be messed up at idle I be concerned that you’re going to be sloppy Richard I’ll in a few idle for extended periods of time possibly you’re going to be making oil in the crankcase because fuels going to be puking into the crankcase
Sorry accidentally posted while I was editing -the orifice plate is used to aim the fuel stream and for fuel atomization. The flow rating is the flow I regardless of the number of holes in the plate. Removing the orifice plate will increase your WOT flow but will also increase your minimum achievable idle flow... so potentially you will be sloppy rich at idle. Concerns are running quality at idle and possibly pushing gasoline into your oil “making oil”.
Wayne Kolden Here’s the absolute truth, we haven’t touched this make shift test stand since making this video. The fluid we were using iirc was denatured alcohol.
I want to share both our experience, our friends experience, and several people online running Boosted combos with de capped injectors.
1. It usually takes more than one set of injectors, to get reconditioned/flowed by Eric Derr injector service to assemble a full set. We’ve found there’s generally a big variance in the output of the GM injectors, normally people send in at least 2 sets so Eric can flow them all and hand select the best 16.
2. It is proven, all the Myths about spray pattern, angle, path etc literally make no difference in operation.
3. Go to Badluckgarage Robert has a great video debunking the hysteria surrounding the decapped injectors. Robert shows on his own Turbo C10 how it’s tuned for start, idle, part throttle cruise and WOT.
Check out Doug at Goodenoughgarage as he’s made videos showing his success with decapped injectors.
Matt Happel “Sloppy Mechanics” has more than validated the validity of running decapped injectors in moderate boosted applications from 400-600 rwhp. Even in his wife Jamie’s daily driver truck.
Richard ended up trying to run the EBay 80# injectors but they were junk, couldn’t be tuned, so he ended up buying a set of the Holley 83# and they responded much better to tuning with his Holley Dominator EFI. I admit we are novice or below trying to tune, we’re both just learning as we go. 👍
I truly appreciate your feedback, many people are curious yet hesitant on the decapped subject. As for me, when I install the Turbo on my “Turd-no” Blazer I’ll be running a set of decapped. 🤞
HeadFlowInc I can’t argue with success if it’s working for you that’s all it matters . Of course if we’re having fun during the journey that’s a bonus.
Wayne Kolden I appreciate your input, it generates the curiosity to learn. If I was going to exceed ~500 rwhp I’d recommend going with a quality name brand injector.
As my build unfolds, in “Theory” 🤞 I should be able to get really close to 500 whp at 10# Boost.
First stage is the 4.8 NA build looking for 300-330 rwhp. Then install the Turbo setup! 👍😁
What if you have a 5.3 lm7 mild cam 4.8 flat top pistons will uncapping the stock injectors be useful on a every day driver or is uncapping more useful for racing?
Kt Carroll Way to much injector flow for your combo. If you wanted to upgrade just shop for a set of factory GM Flex fuel injectors. Have it tuned. 👍
HeadFlowInc tuned? Oh boy mo-money. Can they tune it for new injectors when I have the ecu flashed and all the useless crap taken off? Or only with truck running? Kinda new at swaps on these engines
Kt Carroll There are companies who sell tunes like Nelson Racing Engines and more. Even having a basic tune where they speed up your Power Enrichment and demanded AFR at Wide open throttle will make a big difference in power.
The factory tune is only set for lean efficiency plus they delay the power Enrichment to above 4000 rpms at 90%+ Throttle sometimes even adding a few seconds! 😳👎.
HeadFlowInc I really appreciate the info once I get the block and head finished I’ll move to the fuel delivery system. I hope my 84 c10 likes it
Kt Carroll You’ll like it, the LS 5.3 has more Torque than the old school 350 from having a longer stroke on the crankshaft. 5.3/3.622 and 350/3.480
This means more towing power and better seat of the pants acceleration! Enjoy! 👍
Hey headflow. I got a question maybe you can help on my 2000 5.3 fuel rail is from the 2000 but I got a wiring harness from a 2002 suburban 5.3 flex fuel engine with the 411 PCM Do you know if the flex fuel stock injectors will fit the 2000 fuel rail? The injectors connectors(2002 wiring harness) are definitely different from the 2000 injectors the 2000 injectors are part #25323974 Any help would be grateful
Kt Carroll I thought you could run the higher flowing flex fuel injectors with the return style fuel rails. I’m also thinking the wiring harness should be the same between 2000-2002. 🤔
I’ll ask some friends to see what I can verify. JD
HeadFlowInc really appreciate it there is a guy on here put in these injectors 12613412 in his 02 5.3 he said they are 50lb injectors
HeadFlowInc the harness is the same except the injector connectors are bigger on the 2002 harness not the tiny connectors on the 2000 non flex fuel I also got the pcm 411 off the 2002 so hopefully the pcm will be set up for flex fuel injectors. This is all according to the vin off the 2002 suburban
Kt Carroll No, the flex fuel is 33-35# injector at factory fuel pressure. Unless you decap the injector.
I think he is confusing injector flow rate and fuel pressure.
Kt Carroll They sell snap in adapters to go in between the different injector connectors, no splicing required. Cheap, so if the connectors are different it’s an easy fix.
I did this to my 4.8 ls engine cost me a lot money to fix it. I try to tune my suv and I couldn’t I need it to fix for me be available to tune my suv.
Aa Vaz Are you saying you decapped your stock injectors? If so it’s highly recommended to send those injectors out to have them cleaned and flowed. Eric Derr will clean/flow injectors for a decent price as an example, see if you can find somewhere that works for you. JD
Is to late i replace them all ready. But make sense by doing that you going to run rich. Your car is going to bee misfired. Means your spark plugs, 02 sensors, cats and on my cause my flowmaster. Got ruined because I run my suv thinking that I could fix.
So you decided to just dump mpre fuel into a N/A engine and expect for it to run? Nahh brotha. More fuel needs more air. Why decaps work for boost but not N/A
they are rated at a base pressure of 3 bar and you ran your test at 4 bar. 104/4*3=78.
After we made the video we went to ebay, the flow difference was a simple difference in the fuel pressure. Our test was made using the factory LS return style fuel rail rated at 58-62# of fuel pressure. After reading the ebay listing the knock off 80# injectors were flowed at only 42# of fuel pressure. By simply increasing the fuel pressure from 42# to 58# bumped the flow from 80# to 104# per hour or 835cc to 1092cc per minute. Thanks for the feedback hope this helps! JD
What happened to the arduino set up
jorge salinas What’s a arduino?
Its a microprocessor in which you can write a specific code to do a injector testing to precise timing intervals like 10sec dynamic or 10sec static flow
jorge salinas That would be excellent, a true tuneable test stand! I appreciate the info! JD
Yea look it up here
ua-cam.com/video/e_g9K0VEsfE/v-deo.html
I'm getting 87lb hr out of set of decapped flex fuel injectors.
Scott Coleman Sounds great, those Flex injectors are bigger to start with, so in the 80’s should be legit. Keep everyone informed on how the run! JD
I've been running them for a while now, recently went to e85 10psi, still have a little headroom on injector but am very close to running out of pump with the single Walbro 450. They tune good really no complaints.
Scott Coleman I better get busy looking for flex fuel injectors! It’s best to have 2 sets so Eric can match a decent set. Thanks for the feedback hopefully it helps everyone! 👍
What about the 4 hole decap
Alex Duke It’s in the video, it doesn’t flow anymore than a regular 2 hole injector. Upgrade to the flex fuel injectors then you’ll see a big gain in flow. 👍
HeadFlowInc yes I understand that but you had 2,4 capped flowed the same. I don't necessarily think that them uncapped would ,unless it's the same injector with a diff cap.... So are you saying I can uncap my 5.3 to allow more fuel ? I have a donor truck I'm trying to use my 02 5.3 intake on a 05 6.0 block and heads with my comp thumper cam and all my bolt ons. will my 5.3 injector keep up ? is this just for adding boost ? which I may go to one day after I solid axle swap obviously it's been a project since I was 17 and I'm 30 now and ready to really do it"big"now .I should have stuck with 35s once I went to 37 with a 5.13 gear I exceeded the strength of the front end
My machinist isn't up on these ls motors so he can't answer the questions I've been asking. I guess it's time to join a forum! I like his shop because he'll let me use his equipment on my own stuff and just tutor me while he's working to help me save money Lewis is the only reason I can go fast taking care of 5 kids he is a blessing
Alex Duke Factory injector is fine for a naturally aspirated engine. 24# injectors can handle a lot of power. Decapped injectors is for Boost
HeadFlowInc where are you located probably not in the Richmond VA area
Alex Duke Just South of Kansas City, Mo. Let me know if there’s anything I can help with. 👍
Not PPH, not sure if thats even a thing, Its PSI, pounds Per Square Inch...
Steve Lindsay Injectors are rated at Volume per minute/hour not PSI. Pound Per Square Inch is a measure of pressure ie fuel pressure at 48# to 62#
Fuel injectors are rated at 24#, 36#, 60#, 80# etc. 👍
Thanks. I've only run Carbs on my Hot rods and trucks, I don't own anything new enough to have fuel injectors, so when I heard you say pounds per hour, I had never heard of that before, . Never to old to learn something new or re-learn something old... No offence mean't by the comment, and thanks for the clarification.
Steve Lindsay No problem at all, I’m new to fuel injection myself. With the new Fitech and Holley fuel injection kits that bolt on like a carb and self tune it’s a good time to try it! I would play with a carb but im going Fuel Injection from now on, it’s too easy especially for daily/Winter driving. Thanks for your conversation! 👍
Injectors measured more due to being 100% duty cycle, most injectors I've ever heard of are rated at 80% duty cycle.
104# x 80% = 83.2
don't complaint if wasting gas like a V12 engine.
Moe Maywood ?
Not true once you tune the fuel table to the new higher flow rate. Check out my friend on the badluckgarage concerning the tuning of the decapped injectors.
The issue people tried to focus on is the change from a fan pattern to a pencil spray pattern. Hint: all Large flow injectors use the pencil spray pattern. 🤔
You can tune the cold start, idle, part throttle cruise, and WOT power in the same way as any other injector. Don’t fall for the negative Nelleys trying to ruin a good idea because it’s inexpensive. 👍
STUPID COMENT moe!!!!!!!!!
@@HeadFlowInc I run decapped in 2 of my rides one a n/a 6.0 mild build and the other is in my 3500hd which is a mild cammed lq4 running 10# boost daily.
In my n/a one I've dove it for 4 years as a daily and on road trips .
Burns less gas than my bone stock 5.3 trailblazer
Not a accurate test do to four different injectors
Zane Wilson Why would you feel the test isn't consistent? Could you elaborate?
Here's the setup: Single common fuel rail, fed by a Walbro 255L fuel pump, fuel pressure regulated to set test pressure. Even the voltage to the pump is monitored and controlled.
Even if you add up the flow of all 4 injectors it wouldn't come anywhere near the volume and flow provided.
There's no way flowing different sized injectors on the same fuel rail significantly affects any single injector flow. If the injector size affected the individual flow, the the injector farthest from the fuel supply would always flow less regardless of size. This isn't how it works. JD