Nnbs injectors causing truck to run bad???
I put some Injectors in my truck from a 09 silverado and went ahead and switched the pigtails from the older injectors to ev6 style just getting ready for my new injectors to come in.well now the truck runs real slow it dosent have the power it used to and dropped. 5 in the quarter mile!Is there something different from the old injectors to the new ones?I looked up the part numbers and there both 24 lb injectors?I used a test light and I'm getting a pulse from all my pig tails so I know there good.Any idea why that would happen?
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What injectors are they?
GEN 4 stock injectors are going to be larger than 24lb/hr at 58psi. Of the couple of 09 tunes I looked through they are 29lb/hr at 58psi and the GEN 3 P01 and P59 use a base of 58psi for the IFR table. GEN 4 IFR tables will show 25lb/hr at 3 bar and 29lb/hr at 4 bar. Talking non flex fuel vehicles here too, flex fuel truck injectors are around 38lb/hr. |
Originally Posted by FFDP
(Post 5425519)
What injectors are they?
GEN 4 stock injectors are going to be larger than 24lb/hr at 58psi. Of the couple of 09 tunes I looked through they are 29lb/hr at 58psi and the GEN 3 P01 and P59 use a base of 58psi for the IFR table. GEN 4 IFR tables will show 25lb/hr at 3 bar and 29lb/hr at 4 bar. Talking non flex fuel vehicles here too, flex fuel truck injectors are around 38lb/hr. And here is my gen 3 injectorshttps://cimg7.ibsrv.net/gimg/www.per...5fd5f6a9ad.jpg |
So no tuning was done?
If so that is your whole problem, the injector flow rate will need to be changed for the larger injectors and the VE and MAF need re-tuning for the larger injectors. |
Originally Posted by FFDP
(Post 5425525)
So no tuning was done?
If so that is your whole problem, the injector flow rate will need to be changed for the larger injectors and the VE and MAF need re-tuning for the larger injectors. |
If you put in larger injectors and didn't tune then you are dumping tons of fuel and the calculated air mass will be wrong all of the time.
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Originally Posted by 2002_Z28_Six_Speed
(Post 5425539)
If you put in larger injectors and didn't tune then you are dumping tons of fuel and the calculated air mass will be wrong all of the time.
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Originally Posted by Shtbox
(Post 5425540)
yea I read on ls1tech somewhere the nnbs injectors were 24 lb and so we're my originals i got some bad Info somewhere along the way but yea it all makes sense now
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Originally Posted by madmann26
(Post 5425552)
Yea, that's BS. Damn near all of the NNBS trucks are FF, or capable of FF which means they have the larger injectors.
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Just soldered my stock Injectors back on my truck and it's back to melting tires!lesson learned thanks for all the help guys guess I jumped the gun in between retunes.guess I gotta do it all the day before or day of the retune.luckily I work at lkq and injector pigtails are pretty much endless therehttps://cimg9.ibsrv.net/gimg/www.per...aa98eec932.jpg
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