When can you expect a hp gain from larger injectors with the Duramax LB7 ?
Stock to mild build to wild build...........
any testing here ?

Greg McCall

Fory overs netted me 70HP. Dyno'ed at 315 HP on the Kennedy Superflow.

Big program plus a good nitrous setup and you gain 500 ponies....

Fory overs netted me 70HP. Dyno'ed at 315 HP on the Kennedy Superflow.

Big program plus a good nitrous setup and you gain 500 ponies....

are you talking over stock w/o any program installed?

The 315 figure is with stock programming. No power adders except the injectors.

bmdmax 70hp with just injectors:eek: ?? Thats impressive shows how undersized the stocks are. How much, where, and how big of a pain were they to install. How bad are they on fuel mileage

TTS 80:

338/574 - before injectors
400/675 - after injectors

TTS 120:

375/659 - before injectors
428/758 - after injectors

These were Diesel Dynamics 75HP injectors. I haven't put my stock pcm back in yet to dyno it just stock w/ injectors.. i'm sure it will get at least the same or a bit more stock..

Do not forget that using big injectors does little to no good when running a big program. The problem with Fuel Rail pressure comes into play soon than with the stock injectors. So if your looking to get 75 Hp on top of a big program it will not happen, period. Nick's truck lost power by adding the big injectors to the Xtreme program. How much it will gain you with NOS IMHO is still up in the air. Just remember the fastest and quickest duramax on NOS and NOS + LP is still running with stock injectors!

Do not forget that using big injectors does little to no good when running a big program. The problem with Fuel Rail pressure comes into play soon than with the stock injectors. So if your looking to get 75 Hp on top of a big program it will not happen, period. Nick's truck lost power by adding the big injectors to the Xtreme program. How much it will gain you with NOS IMHO is still up in the air. Just remember the fastest and quickest duramax on NOS and NOS + LP is still running with stock injectors!
steve, what would u recomend w/ the extreme and the ats turbo?

Not that most of you guys care, but do big injectors tend to hurt mileage?

It seems like nearly all other diesel mods allow for even better than stock mileage as long as all the extra power isn't used, i.e. the truck is driven conservatively.

Also, how does a lift pump change the situation with bigger injectors? It seems like we're already overfueling anyway, so why would even more fuel be neccessary?

bmdmax 70hp with just injectors:eek: ?? Thats impressive shows how undersized the stocks are. How much, where, and how big of a pain were they to install. How bad are they on fuel mileage

The injector install is a big job for the average DIY guy. I did my own over the course of a week working on it at night after work. I went very slow though, a good tech can rip it out in 8 to 12 hours. I am running Kennedy Diesel injectors in my truck and go for 1,200 to 3,000 bucks depending on what route you take.

I did see a small drop in economy but I still get 15 to 16 around town even beating on it pretty good and 19/20 MPG on the highway cruising.

I don't disagree with the fact that a larger injector all things equal could drain a rail faster. However, as the fueling issues are resolved injectors will definitely be a part of the power building platform. My rail pressure holds well even with the forty overs. Other trucks have seen different results. I have done a good bit of work to maximize the potential of my fuel system.

DT, mine may be an anomaly but you did think it did well here by looking at your post #10.
http://dieselplace.com/forum/showthread.php?t=13054&page=1&pp=10&highlight=injectors

I would think that with your programming skills and by controlling the injection event that you would be interested in their potential.

DP,
What was your motivation to try injectors if you feel it hurt your max numbers with the Extreme?

We might have to add injectors to the list of eternal battles here at the diesel place. :o:

Brandon

While you run a highly modified fuel system and special diesel fuel at the dyno events I don't believe that this is what most people are after. Let get the complete truth out here and now and let everyone know all the modifications you have made to try and make injectors work properly. Your one of the 1% customers who will go to the ends to make power and suffer when it doesn't work properly

At this point in time there is no magic fix for the rail pressure problem, everything that we have found and corrected has helped but the problem is still one in the same....... low fuel pressure. Low fuel pressure causes the injectors not to fully atomize the fuel being injected. This means more fuel goes unburned during the combustion process due to the fact that it's in liquid form rather than gaseous form.

Now I can program around the injectors but what for.............. you spend $1200 - $3000 for them and end up right back where you started but in order to do that you need to spend some more $$$$ and get a reprogram, seems like a waste of time and money in my book. Once the Rail pressure problem is resolve via a new high pressure pump assembly all beats are off as it will be necessary to reprogram to properly control a larger pump anyway.

Why do you think I am suffering? My truck runs great with the injectors. I have not "had" to do anything to make them work properly. My fuel system mods started well before I ever put the injectors in to solve the inherent problems that the stock system has making big power.

So now the fuel is the key? Yes I have a setup to run Pure Purple. At 13.00 a gallon do you really think I run it all the time? 95% of the events I attend are on plain old #2 fuel.

What is wrong with being part of that 1%? I have shared my mods with anyone who ever cared to ask. I have posted plenty of things to help others. I have tried things that have not worked. I have perfected many things that help me to be successful in making power but I am suffering?

Why is it necessary to make me look bad for trying to generate great results with my truck? I have put the truth out there, now I am a liar?

We know what he meant by suffering with the fuel rail pressure problem so hang tight, the ATS injection pump is in the works. We're seeing 25000 psi with big programs and big injectors!!!! Stay tuned.
:D

We know what he meant by suffering with the fuel rail pressure problem so hang tight, the ATS injection pump is in the works. We're seeing 25000 psi with big programs and big injectors!!!! Stay tuned.
:D

Sounds good! :ro)

DP,
What was your motivation to try injectors if you feel it hurt your max numbers with the Extreme?

We might have to add injectors to the list of eternal battles here at the diesel place. :o:
I wanted to try something new. steve told me it would happen and i expected it. i really liked the TTS120 for a daily driver, so i thought the injectors would make it better, which they did. its my favorite daily driver tune. i also did it for NOS. With the injectors and the full extreme i can set a 1093 (which i expected). i figured eventually they would help as you can shoot the fuel in quicker, presuming you've got the pressure to do it.. mostly i wanted to try some for the hell of it. i hadn't seen anyone running the DD ones so i figured what the heck... Granted now i get to bug steve about making them run right ):h

:secret: I'm not letting grass grow under my feet either.

:secret: I'm not letting grass grow under my feet either.

well hurry up :joke: :lol:

I wanted to try something new. steve told me it would happen and i expected it. i really liked the TTS120 for a daily driver, so i thought the injectors would make it better, which they did. its my favorite daily driver tune. i also did it for NOS. With the injectors and the full extreme i can set a 1093 (which i expected). i figured eventually they would help as you can shoot the fuel in quicker, presuming you've got the pressure to do it.. mostly i wanted to try some for the hell of it. i hadn't seen anyone running the DD ones so i figured what the heck... Granted now i get to bug steve about making them run right ):h

I really like my injectors too. Sounds like we were both shooting for the same things. I have never popped a 1093 on my LB7 though. Sometimes it is nice to be ahead of the curve.
:cool:

Fory overs netted me 70HP. Dyno'ed at 315 HP on the Kennedy Superflow.

Big program plus a good nitrous setup and you gain 500 ponies....
The way I read your post, 240-250 stock, then 40 over injectors a big program, and nitrous will give about 740+ rwhp! Is this what you were saying? If so:eek: :eek: :eek: :eek:

The way I read your post, 240-250 stock, then 40 over injectors a big program, and nitrous will give about 740+ rwhp! Is this what you were saying? If so:eek: :eek: :eek: :eek:

That is exactly what I was saying.


http://www.bmdmax.com/images/dyno6.jpg

:)

That is exactly what I was saying.


http://www.bmdmax.com/images/dyno6.jpg

:)

:eek: :eek: :eek: The waythe torque was climbing, it must be in the 1500 rwtq range. :eek: And 675+ rwhp for about 800-1,000 rpm that is totally :cool2: :cool2:

The torque calculated out to 1446, the dynojet software stopped graphing at 1200 foot pounds.

Brandon

What I meant by suffering is when you try things and they do not work. :( Most people would like things to work out of the box every time. I remember when I told everyone about the fuel system problems and you were one of the few that went and did something about it, others said there was no problems and it was not needed they have event gone as far as saying I am nuts. I think today most people understand that if your going to run a big program it's not only good but necessary to have. I know how your truck would run if you had not modified the fuel system and I'm sure you would not like it. Just because you did it before the injectors doesn't make it any less necessary to have. I've posted enough information about it to sink a battle ship yet there are a few still saying they are not necessary. I'm glad you like to share with others, but how about adding it to your sig. so everyone knows, instead of a select few. It's time everyone starts comparing apples to apples, not apples to oranges. Let's put all the cards out (not 1/2 of them) and let people make there own informed decisions. :cool: