Dry nitrous a/f issue
10-13-2009, 02:17 PM
#1
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Dry nitrous a/f issue I'm currently tuning a 98 Camaro z28. It has all the basic boltons. It has ls6 intake, small camshaft, 3600 stall, longtubes, and a two stage dry nitrous system. On the first stage is a 75 shot and second stage is a 125 shot. The issue is the a/f does not richen up enough on either stage. It will stay around 13.0 on both stages, which is unacceptable.
I've searched and haven't found a clear answer to Fix this. From what I did gather is, I need to adjust the maf table frequencies To aquire the extra fuel? Before the camshaft the maf registered the nitrous and richened up just like it should. We have tried a different maf but it still happens. There is also no codes being set. Just wondering what everyone is doing to add the extra fuel on a dry nitrous system? Thanks for any help
I've searched and haven't found a clear answer to Fix this. From what I did gather is, I need to adjust the maf table frequencies To aquire the extra fuel? Before the camshaft the maf registered the nitrous and richened up just like it should. We have tried a different maf but it still happens. There is also no codes being set. Just wondering what everyone is doing to add the extra fuel on a dry nitrous system? Thanks for any help
10-13-2009, 02:36 PM
#2
That means your running out of fuel most likely. On a bolton car, the stock fuel system maxes out on a 125 shot. Since you have a cam, it's most likely maxed on the 75 shot. Its time for a racetronix pump and 42lb injectors, (60lb mototrons for 175+ shot) if you have not done this already.
10-13-2009, 04:31 PM
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It's definetly got 60 pound injectors along with a single walbro 255 intank pump. I forgot to add that. Has stock lines and rails also. Thanks guys keep the ideas coming!
10-13-2009, 04:35 PM
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Also I can add a lot of fuel to the power enrichment table to make it have the correct a/f. But i shouldn't have to do that. The maf should account for it.
10-13-2009, 05:11 PM
#7
Ok so your spraying in front of the maf? If so, most likely some of the nitrous is getting by the maf undetected. I would move the nozzle in front of the maf and use something like the the Harris speed works interface controller for fueling.
http://www.harrisspeedworks.com/prod...?productid=213
http://www.harrisspeedworks.com/prod...?productid=213
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10-13-2009, 08:03 PM
#8
I'm currently tuning a 98 Camaro z28. It has all the basic boltons. It has ls6 intake, small camshaft, 3600 stall, longtubes, and a two stage dry nitrous system. On the first stage is a 75 shot and second stage is a 125 shot. The issue is the a/f does not richen up enough on either stage. It will stay around 13.0 on both stages, which is unacceptable.
I've searched and haven't found a clear answer to Fix this. From what I did gather is, I need to adjust the maf table frequencies To aquire the extra fuel? Before the camshaft the maf registered the nitrous and richened up just like it should. We have tried a different maf but it still happens. There is also no codes being set. Just wondering what everyone is doing to add the extra fuel on a dry nitrous system? Thanks for any help
I've searched and haven't found a clear answer to Fix this. From what I did gather is, I need to adjust the maf table frequencies To aquire the extra fuel? Before the camshaft the maf registered the nitrous and richened up just like it should. We have tried a different maf but it still happens. There is also no codes being set. Just wondering what everyone is doing to add the extra fuel on a dry nitrous system? Thanks for any help
If it worked before the cam, but not after the cam, I would point towards the tune.
What was done to the maf curve after the cam was put in? Are you sure the car isn't running in speed density mode?
If I had to pull something out of the air, I would bet that the maf curve was not adjusted past the point that the car see's in na form.
10-14-2009, 06:44 PM
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The kit is a 5177, the noids are split up making a two stage. The noZzles are in the side of the lid. My next thing to try is adjusting the maf curve.
10-19-2009, 10:20 AM
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if you can use the pe table to get there then u definetely have enough injectors, pump, etc. id say you need to log it and see where the maf table is readin in hertz and tune it off the high voltage maf table. make a na run without nitrous and log it see how high the hz on the maf goes. then make a nitrous run what you should hope to see is that with nitrous say at 3500 rpms(or whenever you shoot it) has a higher number of hz on the maf. if so you start tuning at that number of hz and up this way it wont affect your fueling without nitrous.
does that make sense?
does that make sense?
