supercharged ap2 dbw cutting out at 7krpm
07-11-2016, 08:07 PM
#1
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supercharged ap2 dbw cutting out at 7krpm
my friend Kenny upgraded to a novi 1200 with 3.4'' pulley id1000 injectors stock pump with regulator crush fro stock ct kit. you can throw a mountain of fuel at it after7k and it just doesn't help . don't have a way to check fuel pressure right now . Anyone got any ideas?
07-12-2016, 09:32 PM
#2
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If he's running stock pump I would start there. Boost is something new to me but I'm still working those gremlins also. I took mine to msr and it cut fuel and starved at half tank. Good on full, but I also don't know what Kenny is doing with it. Daily she is great.
07-12-2016, 10:41 PM
#3
Duplicate thread here?
If so, as I mentioned in other thread, your plugs are gaped too large and on top of that your plugs are getting fouled with oil, which appears to be from leaking valve cover tube seals (you hope!). These issues are overwhelming the spark and blowing out at 7k rpm, which is a typical point for spark blow out for a supercharger because its near peak trq where most of the fuel in the tune is starting to be injected. You wont typically get spark blow out early in the rpms.
Put in some new tube seals, and then plugs at the proper 025-028 gap, make sure your fuel tables are back to a proper scale to where you think they should be and give it a go to redline. Should be good to go. Unless your engine is blowing the oil on the plugs, but lets not go there yet. Good luck!
If so, as I mentioned in other thread, your plugs are gaped too large and on top of that your plugs are getting fouled with oil, which appears to be from leaking valve cover tube seals (you hope!). These issues are overwhelming the spark and blowing out at 7k rpm, which is a typical point for spark blow out for a supercharger because its near peak trq where most of the fuel in the tune is starting to be injected. You wont typically get spark blow out early in the rpms.
Put in some new tube seals, and then plugs at the proper 025-028 gap, make sure your fuel tables are back to a proper scale to where you think they should be and give it a go to redline. Should be good to go. Unless your engine is blowing the oil on the plugs, but lets not go there yet. Good luck!
07-13-2016, 05:26 AM
#4
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I gave my idea in the other thread, but I would definitely go ahead and get a set of 7s and gap em down to .020. I have had no issues with that spark plug setup from 300 to 500 whp.
07-13-2016, 08:31 AM
#5
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i didnt get a chance to check the plugs the day he was over had to be some where we are going to get it dialed in very soon he loaded an earlier file where had guessed with the boost and other mods he's in the low 10's above 7k so we will get it smoothed out. he thought he already had 7's in there i am running iridum 8's with stock gap at 16 psi with no problems. thanks guys
07-13-2016, 09:24 AM
#6
7 are stock heat range. This isn't going to effect spark blow out, but it will control combustion temps. Cooler is better when boosted. 8 is what's recommended and the gap is the crucial part here. You can re gap the 7's and try them, but chances are the amount of oil I saw on them in the pics have warranted them completely fouled and you wont get an accurate troubleshooting equation. Fouled plugs will have similar break up character as spark blow out.
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