Valve float?
11-02-2008, 09:39 AM
#1
Banned
Thread Starter
iTrader: (32)
Join Date: Mar 2005
Location: Fountain Inn, SC
Posts: 1,157
Likes: 0
Received 0 Likes
on
0 Posts
Valve float? ok guys went on the dyno last week and had a problem when i sprayed a 150 shot. It seemed perfect till i got up to 5900-6800 and the car fell flat on its face and a/f went lean twice in a row. The injectors were at 95% . I have prc duals in there so not sure what to do to fix this problem?? what can i do to get this issue resolved. could it be the rockers to tight? stock rockers to and stock heads. Also one other thing it didnt do it on motor just on spray and it was right at the 6k area.
Last edited by 2001z; 11-02-2008 at 10:02 AM.
11-02-2008, 02:59 PM
#2
Running out of injector or fuel pressure. Rule of thumb is 80% injector duty max. You need a wet 150 shot or bigger injectors. If you have a wet shot, then you're losing fuel pressure.
11-02-2008, 07:28 PM
#4
By injector you mean the nitrous fuel injector, right? If you're 57 PSI & @ 95% on the stock injectors, then I would agree that there is an issue w/ the nitrous fuel injector or the plumbing to the nitrous fuel injector.
EDIT: or the electronics/control of the nitrous fuel injector
EDIT: or the electronics/control of the nitrous fuel injector
11-03-2008, 05:49 AM
#5
Banned
Thread Starter
iTrader: (32)
Join Date: Mar 2005
Location: Fountain Inn, SC
Posts: 1,157
Likes: 0
Received 0 Likes
on
0 Posts
By injector you mean the nitrous fuel injector, right? If you're 57 PSI & @ 95% on the stock injectors, then I would agree that there is an issue w/ the nitrous fuel injector or the plumbing to the nitrous fuel injector.
EDIT: or the electronics/control of the nitrous fuel injector
EDIT: or the electronics/control of the nitrous fuel injector
11-03-2008, 05:54 AM
#6
Not sure what you mean by nitrous fuel injector i was meaning 95% duty cycle on the cars injectors im not sure what a nitrous injector is enless you mean nozzle? It was fine up till high rpms like 5800-6k and it took a nose dive. I talked to the guy at the dyno and he said it didnt look like valve float by looking at the dyno runs but im not sure. I dont have a fpss switch either to cause it to cut out.
You said it was a wet shot. A wet shot means that the nitrous system adds fuel to the nitrous w/ added injector or injectors that come with the kit. So, if your nitrous kit did not come with a fuel set up, then you are spraying a dry shot which is overloading your cars' injectors. It's not valve float.
Fuel needs to be added either by larger (car) injectors or a wet nitrous kit.
11-03-2008, 11:36 AM
#7
Banned
Thread Starter
iTrader: (32)
Join Date: Mar 2005
Location: Fountain Inn, SC
Posts: 1,157
Likes: 0
Received 0 Likes
on
0 Posts
You said it was a wet shot. A wet shot means that the nitrous system adds fuel to the nitrous w/ added injector or injectors that come with the kit. So, if your nitrous kit did not come with a fuel set up, then you are spraying a dry shot which is overloading your cars' injectors. It's not valve float.
Fuel needs to be added either by larger (car) injectors or a wet nitrous kit.
Fuel needs to be added either by larger (car) injectors or a wet nitrous kit.
Trending Topics
11-03-2008, 12:22 PM
#8
Staging Lane
Join Date: Sep 2007
Location: manhattan, KS
Posts: 90
Likes: 0
Received 0 Likes
on
0 Posts
if you had your fuel noid fail i would think that that it would only happen once, and make a big kaboom shortly after. I would upgrade the injectors, 95% DC is simply too much. Also i doubt your fuel noid is failing as much as your fuel pump is failing. Replace the pump and the injectors and you should be set to hit the kit all day long.
Last edited by 03_r6; 11-03-2008 at 12:27 PM.
11-03-2008, 03:29 PM
#9
As to the suggestion that you need injectors & a fuel pump; you already confirmed 57 psi during WOT & that the car is not lean during WOT on motor only. So, if it's not lean on motor & injectors are only 95% while spraying, then it's the wet shot kit related fueling, either mechanical or electrical.
11-03-2008, 04:34 PM
#10
Banned
Thread Starter
iTrader: (32)
Join Date: Mar 2005
Location: Fountain Inn, SC
Posts: 1,157
Likes: 0
Received 0 Likes
on
0 Posts
if you had your fuel noid fail i would think that that it would only happen once, and make a big kaboom shortly after. I would upgrade the injectors, 95% DC is simply too much. Also i doubt your fuel noid is failing as much as your fuel pump is failing. Replace the pump and the injectors and you should be set to hit the kit all day long.
