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Old 11-20-2012, 04:43 AM   eBay Motors  #1 (permalink)
 
Join Date: Feb 2011
Location: louisville kentucky
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bigger injector help

i am in need of some new injectors and im planning on going with 50 horse over injectors now i basically have a stock truck now i have a cold air intake an exhaust but im planning on doin efi live hopefully with in the next yr iif money permits soo my question is if i got with bigger injectors now before efi live 1 is it goin to hurt anything ? 2 ive been told they will b puttin more fuel i. an cud possibly get a very lil amount of black smoke?? 3 is there going to be any increase in power i was told the injectors wont show or come live untill i add efi
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Old 12-03-2012, 03:50 PM   eBay Motors  #2 (permalink)
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I did 30% over injectors in mine a couple months ago. I have no tuning, and it will smoke a little right off the bottom before the turbo spools. I couldnt tell you if it will hurt anything because I dont really know. but mines seems to be running pretty good still! i have an intake and a boost valve as well. And with 33x13.5s mine will walk on my dads stock lb7 with stock tires.
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2002 GMC LB7 Duramax
ARP head studs
30% injectors
Suncoast tranny rebuild kit with suncoast triple disk

Last edited by Crapmonstank; 12-03-2012 at 03:52 PM.
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Old 12-05-2012, 01:07 PM   eBay Motors  #3 (permalink)
 
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I was in the same boat on my 03' LB7 when it came time to replace the originals due to failure. I bought some 40hp overs and the only thing I noticed was the mechanic pull me aside with an evil grin and told me that the truck runs like a scalded dog.

I have no tuning and do not smoke at all that I can tell. I just replaced the fuel pressure regulator due to it causing the rail pressure to stay high and the truck dumping into limp mode. She's back to her old self with 180K on the clock 100% bone stock other than the injectors.
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Old 01-21-2013, 01:16 AM   eBay Motors  #4 (permalink)
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i know this thread is kinda old. guessing no one wanted to all the new guys. i know what thats like still get that sometimes. please guys do all yourselves and your trucks a favor and get sum custom tunes for the bigger injectors. efi live ECM swap is only $400 from most good tuners and switch is $40. your truck will run better, smoother power, more power, more reliable, easier on the injectors prolong their life and engine life, better mpg the list goes on and on.
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2001 GMC 2500HD EC/SB w/140k
ENGINE: pretty much stock
TRANS: built by caleb @ blackout performance
TUNING: built trans DSP5 by Tony @ Ridge Runner
FRONT END: built with stock joints
EXTERIOR: pretty far from stock
any questions just ask

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Old 01-21-2013, 04:30 AM   eBay Motors  #5 (permalink)
 
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thank you and yes i went ahead with the bigger injectors got a lil more pep not much but recently talked to the guy that does efi live around here real good at tuning ( did my brothers 01 duramax) he gave me a pretty decent price soo looking to go ahead N move on that within the next month cant wait kinda nervous about the stock tranny but we shall see
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Old 01-21-2013, 11:47 AM   eBay Motors  #6 (permalink)
I stay modding my dmax
 
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good. you will be happy if the guy knows what hes doing. alls long as done alot trucks before you should be fine. stock trans 5speed allison can hold about 400hp. the big thing is on hottest tune be easy on the high speeds like 4th to 5th shift and 5th to 4th shifts. lower gear put less torque on trans and higher gears opposite put more torque on the trans
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2001 GMC 2500HD EC/SB w/140k
ENGINE: pretty much stock
TRANS: built by caleb @ blackout performance
TUNING: built trans DSP5 by Tony @ Ridge Runner
FRONT END: built with stock joints
EXTERIOR: pretty far from stock
any questions just ask

New Bosch reman injector's from
Lincoln Diesel Specialties
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Old 01-21-2013, 11:57 AM   eBay Motors  #7 (permalink)
 
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yea he knows what hea doin he has two pulls trucks an has tuned alota trucks did my brothers too an his turned out good im gunna tell him to make it stock tranny safe not sure i will have a hot street tune we will just have to see
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Old 01-31-2013, 08:41 AM   eBay Motors  #8 (permalink)
 
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I just took the plunge and loaded a mild tune with a handheld tuner on my truck with the .40 overs and the difference is night and day. I'm not as heavy with the right pedal as I used to be but on a couple of test runs I was very impressed. I get a touch of black smoke if I'm taking off hard from a dead stop. I'm more shooting for mileage so I keep my foot out of it. Looks like mileage is heading in the right direction but I won't know till I fill up and calculate it out.
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