just put the 42s and call it the day
What injector size do I need?
On The Tree
Joined: May 2009
Posts: 143
Likes: 0
From: Loris,South Carolina
Laugh it up... like SS RRR said if the pcm is set up for it thas kool.. but instead of spending 3+ for the 42's you can spend 180's for a regulator and turn up the PSI, and by the way i meant 10-15 extra psi.. me honestly i would run 20 or more extra PSI.. i got 300 shot on my car and i got 30's with pressure regulator and i have no problem...cheaper and still fast!
Launching!
Joined: Mar 2003
Posts: 284
Likes: 0
From: Michigan
Why do you guys find this funny? Correct me if I’m wrong, but wouldn’t boosting the pressure also add more fuel?
Seems to me that a fuel pressure regulator restricts fuel flow BACK TO THE TANK, thus making MORE fuel go to the injector instead.
I believe it also helps to atomize the fuel better too, at least that’s what one of the stock eliminator racers that frequent this site claims.
On The Tree
Joined: May 2009
Posts: 143
Likes: 0
From: Loris,South Carolina
Why do you guys find this funny? Correct me if I’m wrong, but wouldn’t boosting the pressure also add more fuel?
Seems to me that a fuel pressure regulator restricts fuel flow BACK TO THE TANK, thus making MORE fuel go to the injector instead.
I believe it also helps to atomize the fuel better too, at least that’s what one of the stock eliminator racers that frequent this site claims.
Seems to me that a fuel pressure regulator restricts fuel flow BACK TO THE TANK, thus making MORE fuel go to the injector instead.
I believe it also helps to atomize the fuel better too, at least that’s what one of the stock eliminator racers that frequent this site claims.
On The Tree
Joined: May 2009
Posts: 143
Likes: 0
From: Loris,South Carolina
never doubt a guy who has his mind made up.. if he wants it bad enough all he needs is the right fuel/nos mixture and the possiblities are endless.... my brother had a 2001 silverado extended cab with 2 stage nitrous system and it run high 7's.. on a stock motor.. all that was done was exhaust and nitrous...
Laugh it up... like SS RRR said if the pcm is set up for it thas kool.. but instead of spending 3+ for the 42's you can spend 180's for a regulator and turn up the PSI, and by the way i meant 10-15 extra psi.. me honestly i would run 20 or more extra PSI.. i got 300 shot on my car and i got 30's with pressure regulator and i have no problem...cheaper and still fast!
-Dustin-
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Verdad Gallardo On The Tree
Joined: May 2009
Posts: 143
Likes: 0
From: Loris,South Carolina
i just found an article in GM High tech performance mag.. "The big cam is supplied with sufficient airflow via a fully ported and welded LT4 intake manifold, BBK 58mm throttle body, and a 150 to 200hp dose of nitrous. The wet-style Nitrous Express kit has recently been expanded from a single Shark nozzle to a dual nozzle, dual stage kit. Clint says he hasn't used the second stage yet, but it is wired in through a Digitech timer while the first stage operates at wide-open throttle. The stock injectors have so far proven sufficient with this combo, using only an NOS 255-lph inline fuel pump and Accel regulator to boost fuel pressure to 55 psi. Likewise, Clint uses the stock Optispark with an MSD Coil and 6A ignition box. Exhaust duties are carried out by a set of Jet Hot long tube headers and 3-inch true dual exhaust setup Clint welded up using a Summit Universal X-pipe kit and Dynomax bullet mufflers."
Soo... being my theory is correct.. there is what you need to know 'WALTSFASTZ'
Soo... being my theory is correct.. there is what you need to know 'WALTSFASTZ'
So then why do Cobra's, Lightnings, etc even use larger injectors? What purpose would that serve...hmmm. You should call up car makers and let them know they are doing it all wrong.
-Dustin-
-Dustin-
On The Tree
Joined: May 2009
Posts: 143
Likes: 0
From: Loris,South Carolina
notice you just named high horsepower vehicles stock... they do that to get em by.. a friend who is the head tech of chevrolet told me they put enough fuel pressure on these vehicles to get em by and thas it.. he told me stock injectors will feed a motor fine if you turn up the psi..
and seriously now a ford... haha.......
and seriously now a ford... haha.......
Oh man you got me. Launching!
Joined: Mar 2003
Posts: 284
Likes: 0
From: Michigan
I thought we were just talking about the affect boosting fuel pressure had on fuel flow? I know other things can too.
Last edited by Michigan Skip; Oct 18, 2009 at 06:53 PM.
The SVO 42lb/hr injectors are rated at 43.5psi. Why are you comparing N/A setups with a N20 wet system to FI regarding fuel injector size?
Fact of the matter is is that without tuning, the AFPR by itself won't do you a bit of good. If you just turn up the pressure by itself, the PCM cannot see that and pulsewidth values will remain unchanged. The result? More fuel for the same pulsewidth, so you'd be running rich. The PCM will see this and begin adjusting the long term fuel corrections to compensate for the change, negating any pressure increase you just did. This is fact.
It is debatable at which point the PCM will begin adjusting, so you MAY see some gains for a short amount of time immediately after you bump the pressue, but this is NOT an accurate way of tuning.
The best thing to do is to pick up injectors rated for your application.
It is debatable at which point the PCM will begin adjusting, so you MAY see some gains for a short amount of time immediately after you bump the pressue, but this is NOT an accurate way of tuning.
The best thing to do is to pick up injectors rated for your application.