Fuel injected n2o users Problems........

Topic: Fuel injected n2o users Problems........ (Read 1214 times) previous topic - next topic

Fuel injected n2o users Problems........

November 19, 2005, 01:59:01 PM

got some problems...................................here is the setup

edelbrock performer selonoids

N.O.S fogger 2 nozzle

-4 to fuel selonoid from schrader valve

-4 feed to n2o selonoid

N.O.S 61 down from 62

FUEL 57 up from 35

What I am having problems with is severe detonation wich sounds like a rod knock.decrease the fuel jet and it gets worse the larger the fuel jet the less noise.So I have increased the fuel size until it has gotten quiter

timing is at 12*deg initial on 93 octane gas

Fuel injected n2o users Problems........

Reply #1 – November 20, 2005, 07:36:13 PM

Is this happening throughout your entire RPM range? Your computer (if you still have EEC-IV) might be giving too much advance.....

Fuel injected n2o users Problems........

Reply #2 – November 20, 2005, 07:57:12 PM

Quote from: Paul Flockhart

Is this happening throughout your entire RPM range? Your computer (if you still have EEC-IV) might be giving too much advance.....

Very likely, need to pull the timing back to 8* or so... Is this a SO 5.0??? If so likely you need to jet it 2-3 sizes richer on the fuel as well.. Or pull some of the juce.

Assuming a SO 5.0 does it have the stock pump?? If so it will have to be upgraded, they are only 60lph to begin with. Probably less with age.

Fuel injected n2o users Problems........

Reply #3 – November 20, 2005, 07:57:13 PM

Quote from: Paul Flockhart

Is this happening throughout your entire RPM range? Your computer (if you still have EEC-IV) might be giving too much advance.....

yeah I worked on it today.......

ended up with 26* total timing insted of 32* total

had to change the fuel pump to a larger unit and now all is ok.:D

still have some very light detonation so i am going to swap in some colder plugs tommorow.....

I blame most of it on these e6 heads:flame:

Fuel injected n2o users Problems........

Reply #4 – November 21, 2005, 11:34:18 AM

what plugs are you running?

Fuel injected n2o users Problems........

Reply #5 – November 21, 2005, 01:00:42 PM

It has just a set of stock replacment motorcrafts in it.. Ive got some a few ranges cooler to put in it.

Fuel injected n2o users Problems........

Reply #6 – November 21, 2005, 01:02:54 PM

Quote from: TurboCoupe50

Very likely, need to pull the timing back to 8* or so... Is this a SO 5.0??? If so likely you need to jet it 2-3 sizes richer on the fuel as well.. Or pull some of the juce.

Assuming a SO 5.0 does it have the stock pump?? If so it will have to be upgraded, they are only 60lph to begin with. Probably less with age.

speaking of fuel pumps it had the oddest on i have seen on any fox chassis car... A bosch pump with a pulsator on top and a 1/4 inet and a huge sock on the end ....It was about twice the diameter of the 255 walbro i put in its place..

Fuel injected n2o users Problems........

Reply #7 – November 21, 2005, 03:37:10 PM

Quote from: SLEEPER T-BIRD 87

speaking of fuel pumps it had the oddest on i have seen on any fox chassis car... A bosch pump with a pulsator on top and a 1/4 inet and a huge sock on the end ....It was about twice the diameter of the 255 walbro i put in its place..

Yea my '87 Sport had on of those.... You just about can't hear them run...

Also unless you have a MSD or something similar, close the plug gap down to .030-.032... Mine just bucked and spit till I did.

Fuel injected n2o users Problems........

Reply #8 – November 21, 2005, 04:11:16 PM

Quote from: TurboCoupe50

Yea my '87 Sport had on of those.... You just about can't hear them run...

Also unless you have a MSD or something similar, close the plug gap down to .030-.032... Mine just bucked and spit till I did.

yeah thats on my list today. I wish the rest of my parts would show:D I picked up a set of e7's and a b cam and a stang puter:flame: I am working on a new intake based on a truck lower also