73 nitrous jet 36 fuel and still rich?
12-20-2006, 10:44 PM
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73 nitrous jet 36 fuel and still rich? i decided tonight to put in some bigger jets and get a tune. running hp tuner my narrow 02s were in the low 900 range and the car felt ok except for the popping in the exhaust. i have read that the is due to a rich condition and i started with a 39 fuel and went down to a 36 now. still popping. i dont stay in it very long due to the noise thinking it could hurt something. anyone else running a 73 jet nos brand and i have a dynotune nozzle shooting in at about 5 oclock in the throttle body. also what hp would that be. again its an nos nitrous kit. thanks 
12-21-2006, 01:16 PM
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Originally Posted by jldak318
check the timing and see where that is at. it sounds like you need to pull a lil out. 200 shot hu?
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12-21-2006, 03:10 PM
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Originally Posted by brad8266
900 Mv is too lean.
Last edited by Z284U2TRY; 12-21-2006 at 03:21 PM.
12-22-2006, 01:29 PM
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Originally Posted by Z284U2TRY
agree if thats all he has to go by. get it on a dyno with a wideband.
12-22-2006, 01:31 PM
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Originally Posted by cjg454ss
checked the plugs and they looked all good. one plug wire fell off though but it was still running ok. it must of been arching. you think that would cause popping?
12-22-2006, 05:28 PM
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i just ran on a 73/41 pill to get my 11.262 run. on the way home from the track, i was playing around and dropped a cylinder. slightly melted the #5 electrode. it was the only plug affected.
according to my ny-trex chart for 200 it is 73/36 @ 60psi FP. 73/38 @ 50 psi fuel. and my FP was right at 50 psi the whole way down the track.
according to my ny-trex chart for 200 it is 73/36 @ 60psi FP. 73/38 @ 50 psi fuel. and my FP was right at 50 psi the whole way down the track.
12-23-2006, 12:02 AM
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Originally Posted by mrr23
i just ran on a 73/41 pill to get my 11.262 run. on the way home from the track, i was playing around and dropped a cylinder. slightly melted the #5 electrode. it was the only plug affected.
according to my ny-trex chart for 200 it is 73/36 @ 60psi FP. 73/38 @ 50 psi fuel. and my FP was right at 50 psi the whole way down the track.
according to my ny-trex chart for 200 it is 73/36 @ 60psi FP. 73/38 @ 50 psi fuel. and my FP was right at 50 psi the whole way down the track.
12-23-2006, 08:02 AM
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Originally Posted by cjg454ss
damn i have a wlbro pump. whats the pressure?
12-23-2006, 09:26 AM
#16
stock o2's cannot be trusted for nitrous tuning. you need a wide band and start with the right jet. 18 * is where you should start for timing. Most guys don't ralize that having 2-3 more degrees of timing than where it wants to be is not going to pick up more. also lean does not neccessarily make morte hp. we have done alot of n2o testing on the dyno and track and found nitrous loves to be lugged and rich. either way good luck and get the wideband in there.
12-23-2006, 10:57 AM
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Originally Posted by ShiznityZ28
stock o2's cannot be trusted for nitrous tuning. you need a wide band and start with the right jet. 18 * is where you should start for timing. Most guys don't ralize that having 2-3 more degrees of timing than where it wants to be is not going to pick up more. also lean does not neccessarily make morte hp. we have done alot of n2o testing on the dyno and track and found nitrous loves to be lugged and rich. either way good luck and get the wideband in there.
12-23-2006, 11:17 AM
#18
Originally Posted by cjg454ss
im running 25 degrees, i have a large cam and was running 30-34 on motor. u think i should pull more?
yes. your avg motor like ~ 28 * on the motor. Its hard to make a blanket statement though. different cams and compression will want different things. But as a general rule we would pull 4-5* for 100shot on an ls1 and 9-10 on a 200. we also run good gas and a cold plug. we have tested setups on the endga and safe setups and the 2-3% gain is not worth the damage it can do for most guys.
12-24-2006, 09:49 PM
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The timing aside. I pull 8deg. on a 73jet, on a ford but same principal, from my motor tune. If your plugs look good then you might be maxed out on the solenoid size. The small solenoids usually have a .073 orifice, usually want a larger orifice than the jets. Also in my experience I had similiar problems with a cold fusion nozzle a couple of years ago. I think they are pretty much the same nozzle. Anything over a 62 jet was useless, just couldnt seem to handle the nitrous volume.
