Deka 60s or decapped truck injectors turbo 5.3
01-21-2017, 06:19 AM
#1
Deka 60s or decapped truck injectors turbo 5.3 Hey guys, not alot of info out there so i thought i'd ask. I'm doing a 5.3 turbo (surprise) with the standard denmah kit 69 mm gt45 truck manifolds. Anyways i have a racetronix 255, boost ref fpr and deka 60s in the car now, but i also have the original truck injectors from a 2002 which i believe are flex fuel. If i can decap them and get almost the same performance as deka 80s i'l do it in a heartbeat. I'm just worried tuning may be an issue. I'l be taking it to a tuner and don't want any issues. My end goal is 500-550 hp. So what do you think run what i got or give the decaps a try? Thx
01-21-2017, 07:27 AM
#2
FormerVendor
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Deka Injectors Hi, I work with Siemens, tested DEKA 1's, 2's, 4's, 6-8's.
They are very good and have a large amount of small fuel droplets.
I do not understand your term "decap" ?
My method would be a "bench" test of each, same time AND view/measure the fuel quality.
Lance
They are very good and have a large amount of small fuel droplets.
I do not understand your term "decap" ?
My method would be a "bench" test of each, same time AND view/measure the fuel quality.
Lance
01-22-2017, 09:32 PM
#7
TECH Enthusiast
I'd buy the DEKA 80lb ones, before I'd modified the factory injectors. Who knows how that will affect things like the spray pattern, offset, the min pulse, and other performance characteristics, other than just the flow rate. I only use injectors that have good tuning data available. I've found tuning idle difficult if your injector data isn't spot on, especially with a moderate to large cam. The 80s are almost the same price as the 60s, I think I paid $5 more for the 80s. That will give you room when you go to turn it up. You may also want to go E85, the 80s will probably be needed there by about 550 hp, those 60s will be over the 80% duty cycle. Boost is addictive, and having some head room on your injector is a good thing.
On the pump side, I would not even bother trying to run a turbo car on a singe 255.
On the pump side, I would not even bother trying to run a turbo car on a singe 255.
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01-23-2017, 06:38 AM
#8
Restricted User
I like the decapped injectors lol. You don't have to change any of the injector data other than flow rate in the tune and you're done.
I decapped the truck injectors on a stock truck, spend ~5 minutes playing with injector flow until it ran/drove like stock without touching the VE table or any other tables in the stock PCM. Just that single row for flow numbers and it was golden.
A buddy of mine made 600whp on a twin turbo 4.8 with uncapped flex fuel injectors at 80% duty cycle.
I decapped the truck injectors on a stock truck, spend ~5 minutes playing with injector flow until it ran/drove like stock without touching the VE table or any other tables in the stock PCM. Just that single row for flow numbers and it was golden.
A buddy of mine made 600whp on a twin turbo 4.8 with uncapped flex fuel injectors at 80% duty cycle.
01-23-2017, 10:05 PM
#10
They might work, but the spray pattern is garbage and the offsets do change - you're flowing more fuel through an injector and it will change the characteristics. Doesn't mean you can't do it - you can crutch anything.
The only modified injector I'd run would be the IDs but they cost too damn much. The Dekas are a better injector than even the IDs though (the 60s; 80s are iffy). And lots of data for them so no problem tuning them.
I'd run the 60s.
And here's the breakdown on the limits (assuming pump gas):
Walbro 255 is about 600rwhp NA and 500rwhp Boosted (58psi base, boost referenced)
Stock fuel lines are good to about 700rwhp (after that really need an -8AN feed or -10 and a -6 or -8 return) - if you're running LS1 lines that is - don't know?
Deka 60s are good for about 650-700rwhp (assuming enough pressure)
If you ran twin 255s with stock lines and the 60s, you'd be good to 700rwhp. If you plan to push more, get at least a -8/-6 line kit with twin 255s. That's good for 1000rwhp or so. And if you had the 80s they'd be good to close to that. But I would probably step up to the Bosch 95s at that point.
The only modified injector I'd run would be the IDs but they cost too damn much. The Dekas are a better injector than even the IDs though (the 60s; 80s are iffy). And lots of data for them so no problem tuning them.
I'd run the 60s.
And here's the breakdown on the limits (assuming pump gas):
Walbro 255 is about 600rwhp NA and 500rwhp Boosted (58psi base, boost referenced)
Stock fuel lines are good to about 700rwhp (after that really need an -8AN feed or -10 and a -6 or -8 return) - if you're running LS1 lines that is - don't know?
Deka 60s are good for about 650-700rwhp (assuming enough pressure)
If you ran twin 255s with stock lines and the 60s, you'd be good to 700rwhp. If you plan to push more, get at least a -8/-6 line kit with twin 255s. That's good for 1000rwhp or so. And if you had the 80s they'd be good to close to that. But I would probably step up to the Bosch 95s at that point.
01-24-2017, 01:15 AM
#11
since a few of u guys are in here, I figured I would ask a question. I am currently running twin 255s with -8 feed and -6 return. Boost ref regulator. deka 80s
With my turbo setup in my sig. stock bottom 5.3 with 15psi I was seeing around 90% idc. I had fuel pressure at 50psi base. I thoughts that was pretty high idc comparing to what ive heard and read. Do u think bringing base up to 60psi would help that much? Maybe one of the 255s is weak? I maintain my commanded 11.5 afr without any issues. Whats your thoughts?
The 255s are not the higher pressure versions. I had them in 2 other NA builds before going turbo.
With my turbo setup in my sig. stock bottom 5.3 with 15psi I was seeing around 90% idc. I had fuel pressure at 50psi base. I thoughts that was pretty high idc comparing to what ive heard and read. Do u think bringing base up to 60psi would help that much? Maybe one of the 255s is weak? I maintain my commanded 11.5 afr without any issues. Whats your thoughts?
The 255s are not the higher pressure versions. I had them in 2 other NA builds before going turbo.
01-24-2017, 02:06 AM
#12
cool! thanks so much guys. I think I'm just gonna get a single racetronix walbro 450 and call it a day. unless there are some better suggestions, I'm all ears and looking for the simplest installation in the stock bucket of my 93z.
thx jake for all that info,verrry helpful, yes pump gas and yes ls1 stock rails
thx jake for all that info,verrry helpful, yes pump gas and yes ls1 stock rails
01-24-2017, 07:05 AM
#14
Restricted User
since a few of u guys are in here, I figured I would ask a question. I am currently running twin 255s with -8 feed and -6 return. Boost ref regulator. deka 80s
With my turbo setup in my sig. stock bottom 5.3 with 15psi I was seeing around 90% idc. I had fuel pressure at 50psi base. I thoughts that was pretty high idc comparing to what ive heard and read. Do u think bringing base up to 60psi would help that much? Maybe one of the 255s is weak? I maintain my commanded 11.5 afr without any issues. Whats your thoughts?
The 255s are not the higher pressure versions. I had them in 2 other NA builds before going turbo.
With my turbo setup in my sig. stock bottom 5.3 with 15psi I was seeing around 90% idc. I had fuel pressure at 50psi base. I thoughts that was pretty high idc comparing to what ive heard and read. Do u think bringing base up to 60psi would help that much? Maybe one of the 255s is weak? I maintain my commanded 11.5 afr without any issues. Whats your thoughts?
The 255s are not the higher pressure versions. I had them in 2 other NA builds before going turbo.
01-24-2017, 10:06 PM
#15
ok yea I figured I would try it and see what happins. What would be a geuss as to what IDC would drop to with 10psi more base pressure? I ask because I'm currently pulling the 80e, blowed the front pump lol. I also read that the regular 255s have a bypass valve for to much fuel pressure. I read its supposedly around 70psi. now lets figure it this way if I'm at lets say 60psi base and run 15psi boost. that puts me at static 75psi. Do I run risk of loosing pressure? could this possibly cause my already higher IDC?
01-25-2017, 07:03 AM
#17
Restricted User
ok yea I figured I would try it and see what happins. What would be a geuss as to what IDC would drop to with 10psi more base pressure? I ask because I'm currently pulling the 80e, blowed the front pump lol. I also read that the regular 255s have a bypass valve for to much fuel pressure. I read its supposedly around 70psi. now lets figure it this way if I'm at lets say 60psi base and run 15psi boost. that puts me at static 75psi. Do I run risk of loosing pressure? could this possibly cause my already higher IDC?
Are you logging AFR in HPT?
Logging fuel pressure is just as easy.
01-25-2017, 09:16 PM
#18
yeah I'm logging afr and it maintains 11.5 without issues. just high idc. I figured this setup should be around 600ish with 15psi. stock bottom 5.3 with tick st2 cam and t6 billet s480. I would log fuel pressure but don't currently have a gauge. I do have a gauge for checking pressure for vehicle service diagnostic. I may hook it up and watch it.
to the OP I would run a 450. better to have more fuel than not enough. one pump is always better than 2 in my book.
to the OP I would run a 450. better to have more fuel than not enough. one pump is always better than 2 in my book.
01-26-2017, 07:33 AM
#19
Restricted User
A transducer is $18-25 for a stainless 100 PSI 5v sensor. Screw it into any 1/8" NPT port on your fuel system and wire it into any of the unused 5v signal like fuel tank pressure (I've you've deleted EVAP). Then you can log fuel pressure in HPT.
Will help you keep track of those fuel pumps.
Raising base pressure 10 PSI should drop duty cycle ~15%.
Will help you keep track of those fuel pumps.
Raising base pressure 10 PSI should drop duty cycle ~15%.