NO2 Backfire
03-22-2009, 05:31 PM
#1
On The Tree
Thread Starter
iTrader: (13)
Join Date: Apr 2008
Location: odessa
Posts: 102
Likes: 0
Received 0 Likes
on
0 Posts
NO2 Backfire I am a little confused here about this. I just put a stand alone system in my car to support a higher volume of NO2. The car did not run near as expected last night at the track. My best time is a 6.69 at 106MPH and last night I ran a 7.14 at 98. This is on a 200 pill VS a 150 on a better time. Question is, am I running to rich, I really didn't bother to look over at my wide band when I was at WOT but I know my AFR on NA is right where it should be 12.4-12.8. I was backfiring constantly all the way down the track as well. So does anyone know what that could be. To rich? The fuel that I am running in the stand alone is C16 and 109 unleaded for the regular system. Plugs are NGK T-9. Plugs are cool enough but just a little confused as to what this could be. Any help would be appreciated.
03-22-2009, 06:36 PM
#3
On The Tree
Thread Starter
iTrader: (13)
Join Date: Apr 2008
Location: odessa
Posts: 102
Likes: 0
Received 0 Likes
on
0 Posts
Its a low pressure pump. 8 pounds is what its set at. 200 shot is the pill size and yes I looked at cylinder 3 plug and there was oil at the base of the plug next to the clinoid and it was pretty free of oil the rest of the way up.
03-22-2009, 09:02 PM
#7
On The Tree
Thread Starter
iTrader: (13)
Join Date: Apr 2008
Location: odessa
Posts: 102
Likes: 0
Received 0 Likes
on
0 Posts
As for the jets, are you saying that I am running a nitrous system that came with jets designed for a high pressure pump. Which means that I was throwing a **** ton of nitrous and not enough fuel to supply the demand, so it was probobly running lean, I should have looked over at my wide band gauge, but just not thinking about it when I am running the car. What do you think.
Trending Topics
03-22-2009, 09:05 PM
#8
On The Tree
Thread Starter
iTrader: (13)
Join Date: Apr 2008
Location: odessa
Posts: 102
Likes: 0
Received 0 Likes
on
0 Posts
03-22-2009, 09:11 PM
#9
http://ny-trex.com/calculator.php
Here is the calculator. There are a bunch out there if you google it.
I think you were having lean backfires due to the jetting. Another option would be to swap the spring out in the regulator on the cell, and run it in high pressure at 55psi. This would let you keep your current jetting
Here is the calculator. There are a bunch out there if you google it.
I think you were having lean backfires due to the jetting. Another option would be to swap the spring out in the regulator on the cell, and run it in high pressure at 55psi. This would let you keep your current jetting
03-22-2009, 09:18 PM
#10
On The Tree
Thread Starter
iTrader: (13)
Join Date: Apr 2008
Location: odessa
Posts: 102
Likes: 0
Received 0 Likes
on
0 Posts
http://ny-trex.com/calculator.php
Here is the calculator. There are a bunch out there if you google it.
I think you were having lean backfires due to the jetting. Another option would be to swap the spring out in the regulator on the cell, and run it in high pressure at 55psi. This would let you keep your current jetting
Here is the calculator. There are a bunch out there if you google it.
I think you were having lean backfires due to the jetting. Another option would be to swap the spring out in the regulator on the cell, and run it in high pressure at 55psi. This would let you keep your current jetting
03-22-2009, 09:25 PM
#11
It all depends on what kind of timing you were running. It might not be a bad idea to run a compression test to make sure the guts are OK.
I have the same problem with the wideband. I never look at it. Now I just log it and check it out back at the trailer.
I have the same problem with the wideband. I never look at it. Now I just log it and check it out back at the trailer.
03-22-2009, 10:33 PM
#12
On The Tree
Thread Starter
iTrader: (13)
Join Date: Apr 2008
Location: odessa
Posts: 102
Likes: 0
Received 0 Likes
on
0 Posts
Timing was set at 22 for the 200 shot. I dont think that having one bad pass on a lean shot would have have done to much damage. Do you really think that having a compression test is necessary?
03-22-2009, 10:43 PM
#13
Honestly, 1 pass could hurt the motor. Is it likely, maybe not. Chances are that nothing got hurt, but it is a cheap reassurance to make sure everything's Ok. It just depends what you want. I would also back the timing off to about 18* and creep up on timing while checking the plugs after every nitrous pass until you get it dialed in. Keep us updated.
03-24-2009, 08:19 PM
#15
TECH Junkie
iTrader: (9)
Join Date: Jun 2003
Location: Winter Garden, Florida
Posts: 3,428
Likes: 0
Received 0 Likes
on
0 Posts
No doubt. He doesn't even talk about tuning the car at all on gas. Scary stuff right. Oh and a 9 is too cold for what you are doing.
03-24-2009, 09:45 PM
#16
On The Tree
Thread Starter
iTrader: (13)
Join Date: Apr 2008
Location: odessa
Posts: 102
Likes: 0
Received 0 Likes
on
0 Posts
Tested the compression in all 8 cylinders and they where all within 172 PSI -194 PSI. So no fatal damage done to the motor. The spark plugs all looked fine as well no melted cylinoids or anything. Thank God I was running 1/8 not 1/4.
And yes, 22* timing is just fine especially when your running 109 unleaded and C16 for the stand alone.
As for the T-9, I had this setup for a 350 pill 2 stage. I ran a 200 single stage just to test the stand alone system. Good thing I did that.
And yes, 22* timing is just fine especially when your running 109 unleaded and C16 for the stand alone.
As for the T-9, I had this setup for a 350 pill 2 stage. I ran a 200 single stage just to test the stand alone system. Good thing I did that.
