Hey guys new to DB so let me know if im doing it wrong.. Anyway have injector Question. Running some form of marine injectors now.. I do know they are 4x.014s that a local shop put in.. feeling like they are giving me the run around and recommend different, larger injectors but wanted to get some opinions first. They put in the set I have now when they did the HG/o-ring head job... they are recommending 5x.018s with my new turbo set up.. super B special. I feel with the set up I have now the turbo lights ok (around 1800) but still doesn't seem to make any more power or boost over stock? figured I would see small gain.. but for sure noticed 300 drop in egt's! So I guess I just need advice as to what size injectors to really make the 64/71/14 make some good power and still DD and do some towing.. 600 hp is my goal

 

5x12's or 5x14's, 5x18's are way to big for the street. you will notice a power difference between the 12's and 14's but the 12's will runn cooler and smoke less.

 

That was what I thought as well.. what about brand, will it change the depth if I go non-marine? my timing is at 23 because I have a high pop off (300bar I think) brings overall timing to about 20 if my local shop is telling me the truth? just want to know what I should get them popped at as well... any help is appreciated because im trying to do the mods myself instead of the run around.. also do you think It will give me more boost ? my thoughts are that it will because there will be more energy to spool the turbo faster, sooner, and harder..ect and I would imagine the air/turbo would have to match the new found fuel..?

 

Boost is a sign of pressure - Not an indication of power or making power...

The "boost Pressure" your reading is the amountof back pressure between the cylinders and the Intake where your getting your readings from ....

The only way to know if and where your making real power is to Dyno your truck .. Or if you want to play a bit more, 1/4 mile and then input the info in to a HP calculator and you will get a good line on the numbers ...

Hope this helps a bit

 

Yes does put a little different perspective on how I thought about boost thanks. does anyone have any recommendations as to what brand 5x14 I should put in and what pop of pressure would be the correct pressure? Also if I use an injector that is a Marine base injector do I need to mount it at a certain that for the correct spray pattern..also I have had my truck dynoed at 401 horsepower and 729 torque with my current setup

 

Its not always the injector bu also tue correct install depth, that can also help the spray patterns, correct fuel pressure from LP, to the IP can make quite a difference ...

do u have the stock intake horn on, or are u using an aftermarket one??
efficiency is everything...

what are your fuel pressures at now ... Both @idle and WOT ..??

Also, what manifold are you using, exhaust wise .... Having a stock one will cause restrictions and higher drive pressures..( back pressure) will hold it back as well

 

wow 300bar is way to high. build them in the 260-280 bar range. or you will be building an injection pump before you know it. 260 is factory. ive had good luck with DAP nozzles. there are many good vendors on here.

 

well 300 bar was what my shop said I had.. Have not actually tested them myself. But he's telling me that with a combination of 23*timing and the high pop off that it creates much better atomization and less hazing..still not sure if I should trust him..but have been running this setup for well over a year no problems with injection pump. I have stock intake and I have stock exhaust manifold stock lift pump no way of knowing for sure what fuel pressure is. he told me that I wouldn't need to change my intake until at least 400 horse which is where I'm at now he said manifold would help efficiency some, so I just haven't seen the need for it as much as I have for the injectors. But I know my drive isn't too bad because my EGTs seem to be in check and it is far better with the new and turbo of course with a looser housing but I agree I do need an intake manifold...so you're saying I should just go with tips instead of entire new injectors?

 

if you have the ability to build them yourself than yes its cheaper to build your own.

i think 260 vrs 300 bar is about 600psi. thats quite a bit extra pressure. and he is right the higher the pressurethe better the atomization and it will slightly effect timing. i still wouldnt build a set set at over 280.

 

ok thanks for that. I don't know how to build them so Im at the mercy of DDP or whoever I use...then it will effect my timing of course... just trying to hit the 600hp mark on my own and with help from you guys of course I only want to buy injectors once because this will be th second time.. wonder why they recommended 5x.018s?