Spraying 200+ shot on stock injectors...how?
03-05-2017, 02:02 PM
#1
Spraying 200+ shot on stock injectors...how? So as a nitrous newbie I've been doing lotsa research and reading around on what people have been doing and came across a couple cars that are running 200+ dry shots on stock lsx injectors 0.o.
http://www.hotrod.com/articles/ccrp-...-beaten-daily/
an example of a 55 chevy spraying 225 dry shot on stock 01 6.0l injectors. Figured it had to be flex fuel injectors but then I found this too:
http://forums.hybridz.org/topic/1139...w-what-a-ride/
Running a 230 shot on stock 28lb injectors on 5.3l with 224/228
Is this years of nitrous knowledge showing itself by these guys? Or is this at all repeatable by the average racer?
On the same note is there a general rule to how much fuel to add for lets say a 100 shot? For example off the bottle a/f ratio is 12.5 so during spray not compensating would it be then 13.5? Just wondering if there is a general rule of thumb for how much nos leans out the ratio
http://www.hotrod.com/articles/ccrp-...-beaten-daily/
an example of a 55 chevy spraying 225 dry shot on stock 01 6.0l injectors. Figured it had to be flex fuel injectors but then I found this too:
http://forums.hybridz.org/topic/1139...w-what-a-ride/
Running a 230 shot on stock 28lb injectors on 5.3l with 224/228
Is this years of nitrous knowledge showing itself by these guys? Or is this at all repeatable by the average racer?
On the same note is there a general rule to how much fuel to add for lets say a 100 shot? For example off the bottle a/f ratio is 12.5 so during spray not compensating would it be then 13.5? Just wondering if there is a general rule of thumb for how much nos leans out the ratio
03-07-2017, 09:07 AM
#2
How are you tuning? Need way more info. To spray a 200 shot you need a little more pump but injectors should be fine.
If you run lean you run the risk of melting parts due to heat. You need to have your afrs down to a science. I run an auto tuner. Just tell it what to be at for afr and it adjusts accordingly. My setup like 12.4 on 200 shot tiny fuel rings on plugs.
If you run lean you run the risk of melting parts due to heat. You need to have your afrs down to a science. I run an auto tuner. Just tell it what to be at for afr and it adjusts accordingly. My setup like 12.4 on 200 shot tiny fuel rings on plugs.
03-07-2017, 02:45 PM
#3
I use hptuners for tuning, in speed density mode. I was more just wondering if the injectors would be fine? Cause from what I've gathered it doesn't seem like they would be able to flow enough to support that although I guess I might be wrong.
I was planning on tuning using the EGT, my wideband, and plugs. Then when running nitrous having a tune that kicked in PE right before wot switch to avoid lean spike
I was planning on tuning using the EGT, my wideband, and plugs. Then when running nitrous having a tune that kicked in PE right before wot switch to avoid lean spike
03-07-2017, 04:41 PM
#5
Haha if you read my original post the whole thing is about dry shots. Well aware the difference between a dry shot and wet shot 
I guess I just didn't think the stock injectors at less than 30lbs would be able to handle the 220+ dry shot along with a cam and other mods. Maybe I just missed if the numbers the stocker injectors held up to were rwhp or fwhp.
I guess I just didn't think the stock injectors at less than 30lbs would be able to handle the 220+ dry shot along with a cam and other mods. Maybe I just missed if the numbers the stocker injectors held up to were rwhp or fwhp.
03-07-2017, 07:37 PM
#6
Sorry didn't catch the dry part. Wet off the rail for the fuel solenoid, and 200 shot pretty much maxes out the injectors. I can't remember exactly the duty cycle but it was close enough I montiored close in the beginning. I upgraded to dry and went to 80 lb injectors. No way I would trust stock injectors on a dry system if you were pulling fuel off the rail.
03-07-2017, 10:07 PM
#7
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How are you tuning? Need way more info. To spray a 200 shot you need a little more pump but injectors should be fine.
If you run lean you run the risk of melting parts due to heat. You need to have your afrs down to a science. I run an auto tuner. Just tell it what to be at for afr and it adjusts accordingly. My setup like 12.4 on 200 shot tiny fuel rings on plugs.
If you run lean you run the risk of melting parts due to heat. You need to have your afrs down to a science. I run an auto tuner. Just tell it what to be at for afr and it adjusts accordingly. My setup like 12.4 on 200 shot tiny fuel rings on plugs.
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03-09-2017, 11:15 AM
#9
Sorry didn't catch the dry part. Wet off the rail for the fuel solenoid, and 200 shot pretty much maxes out the injectors. I can't remember exactly the duty cycle but it was close enough I montiored close in the beginning. I upgraded to dry and went to 80 lb injectors. No way I would trust stock injectors on a dry system if you were pulling fuel off the rail.
Also your not pulling fuel off the rail with dry which is why I kind of like it. Put a fuel pressure safety switch on and I think a dry shot with the correct SD tune has a lot less to go wrong
03-09-2017, 03:43 PM
#11
Ok so let me clarify. I am not that interested in actually doing this. I'm definetely not that good of a tuner haha
I was more interested in learning how this is done? And if you look at the links theres two cars with videos of them running doing this...so I mean it has to be possible? They are doing it unless the meth kit was forgotten to be mentioned or something. I mean hotrod magazine even did an article on the 55.
I'm just trying to learn and was more interested in the discussion of what would need to be done for this? Obviously just getting bigger injectors is the smart and safe thing to do, but I like seeing projects where people really work with what they have and do some innovation
I was more interested in learning how this is done? And if you look at the links theres two cars with videos of them running doing this...so I mean it has to be possible? They are doing it unless the meth kit was forgotten to be mentioned or something. I mean hotrod magazine even did an article on the 55.
I'm just trying to learn and was more interested in the discussion of what would need to be done for this? Obviously just getting bigger injectors is the smart and safe thing to do, but I like seeing projects where people really work with what they have and do some innovation
03-10-2017, 01:49 PM
#12
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If you jack up the fuel pressure you can get quite a bit out of the stock injectors. On a 5th Gen for example, you can run the ZL1 pump with a ADM FPCM and the pressure will go up to 65+ PSI...if your injectors are running 80% DC on 55psi, the extra fuel pressure from the pump at 65PSI will allow your injector DC to lower while still spraying the same amount of fuel.
03-10-2017, 03:06 PM
#13
Ahh that makes sense. Hmm I'm going to have to take a look at my flow rate on hptuners.
I found something called decapping injectors supposed to take stock injectors and double the flow.
https://sites.google.com/site/sloppy...fuel-injectors
Write up about it. Some guy on youtube did it had them flow tested and I think it was around 70lbs or so. Guy also said the person who flow tested them said the pattern looked good for forced induction. I'll try to find the video
But yeah jacking up the fuel pressure makes sense. Would this be way harder on the injectors? Like a race only thing or could you do it on the street too.
I found something called decapping injectors supposed to take stock injectors and double the flow.
https://sites.google.com/site/sloppy...fuel-injectors
Write up about it. Some guy on youtube did it had them flow tested and I think it was around 70lbs or so. Guy also said the person who flow tested them said the pattern looked good for forced induction. I'll try to find the video
But yeah jacking up the fuel pressure makes sense. Would this be way harder on the injectors? Like a race only thing or could you do it on the street too.
03-16-2017, 01:23 PM
#15
TECH Junkie
Denmah has preached decapped injectors because they work. The flow testing put to bed any speculation that they wouldn't. The spray pattern is damn near identical to a seimens deka 80lb injector...but decapping is free and 80lb injectors aren't. Definitely a good way to increase fuel flow, even if it is at the small sacrifice of a "perfectly atomized" fuel spray pattern.
03-18-2017, 04:02 PM
#16
Hahaha someone smarter than me I was typing on phone and couldn't be bothered to make sure I was talking about the right channel. But yeah stumbling upon that made my budget look alot better. Sloppy mechanics rocks
I was typing on phone and couldn't be bothered to make sure I was talking about the right channel. But yeah stumbling upon that made my budget look alot better. Sloppy mechanics rocks Last edited by Cole Curtis; 03-18-2017 at 04:09 PM.