Switching feed lines sizes
03-15-2011, 03:16 PM
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Switching feed lines sizes Would it be benefical switching from 4an to a 6an line from the bottlle to the noid? Presently I have a 4an feed tothe noid then a 3 going into the plate. The noid has about 2 feet of line before entering the plate. I'm waiting on new solenoids to mount them closer to the plate. Which should allow a harder hit. Spraying a 100 to a 175 on a Harris plate.
03-15-2011, 03:21 PM
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Would it be benefical switching from 4an to a 6an line from the bottlle to the noid? Presently I have a 4an feed tothe noid then a 3 going into the plate. The noid has about 2 feet of line before entering the plate. I'm waiting on new solenoids to mount them closer to the plate. Which should allow a harder hit. Spraying a 100 to a 175 on a Harris plate.
Graham @ N20
03-16-2011, 09:59 AM
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Ok thanks for the response. The problem we are having is the car picks up 8 mph in the 1/8th, but only 4 mph overall in the 1/4. On motor it ran 129, on spray 133. We are running out of gear at the stripe. I'm thinking the N2O is kicking off before I cross the mph traps. I have it set to shut down at 7000 rpm. In my thinking I shouldn't be gaining 3-4 mph and only .4ths. This is with the convertor locking up at about 1000 ft in 3rd gear. It's like the car gulps it for the first half of the track then nothing on the back half.
03-16-2011, 03:16 PM
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It has a nitrous tune. Timming taken out, fuel added. I didn't tune the car. I'm looking at getting a wide band soon to find out where I'm at. The plugs look good. I'm sure its running rich. Better safe then sorry. No. Didn't do a consumption test. Not sure what it is or how to do it. I just blew my budget this month on a MSD Timing Ticker to add timming back in when running NA.
03-16-2011, 06:51 PM
#6
It has a nitrous tune. Timming taken out, fuel added. I didn't tune the car. I'm looking at getting a wide band soon to find out where I'm at. The plugs look good. I'm sure its running rich. Better safe then sorry. No. Didn't do a consumption test. Not sure what it is or how to do it. I just blew my budget this month on a MSD Timing Ticker to add timming back in when running NA.
Might be in the tune up or it could be sliping tranny or converter is to loose.
If its running out of gear and shutting the N20 off you should be able to feel it doing that.... if you cant i have a feeling the tune is off/soft/rich
03-16-2011, 08:32 PM
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The tranny is not slipping, the convertor is locked in 3rd. yes the tuner added fuel to be safe. I have been going by the genric jet recommendations. I have purchased add. jets to fine tune the system. The plugs look ok no peppering or metal discoloration. Its not lean so I'm saying rich. Yea it might be falling off at the end. The shift light , n20 off light , having to shift into OD to avoid the limiter all at the stripe. I'm thinking now that the motor is falling off say at the 1000ft mark so its not making any more power regardless of the n2o. Need a recording of whats going on at that pt.
NA it pulls hard through the traps. Why so funny of a statement??? Its true correct.
I'm not a big time racer who can afford to do piston changes at every race.
NA it pulls hard through the traps. Why so funny of a statement??? Its true correct.
I'm not a big time racer who can afford to do piston changes at every race.
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03-16-2011, 09:52 PM
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Its not like its flooded rich. If you add up the nitrous co.s safety factor and my tuners factor it is a rich mix. Rich is far better then lean, even a little lean.
IMOP. The thing to do is get a wide band and figure out whats happening on the big end. The car has plenty of passes on it so it not hurting any thing just not running what I think it should.
IMOP. The thing to do is get a wide band and figure out whats happening on the big end. The car has plenty of passes on it so it not hurting any thing just not running what I think it should.
03-16-2011, 09:55 PM
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Yes thats what I'm thinking. Just scared to do it with out a wide band. I don't even know where the AF is at NA. The car is street driven to the track so reading plugs is difficult. I can always change a set out and then pull them out on the return road.
03-17-2011, 07:46 AM
#13
After that you lose oil control and get oil in the mix and burn it up.
The car should pick up 13-15 mph on a well tuned 150 shot.
You dont need a wideband to tune a nitrous car... read the plugs and go off of MPH if its picking up mph you are going in the right direction on the tune.
03-17-2011, 09:14 AM
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Because everyone thinks rich is safe like you probably 99% of hurt motors are from rich tune ups.
Rich tunes dont hurt motors right away, thats why guys "think" they are safe, it slowly wears out the cyl. walls and takes the tension out of the rings.
After that you lose oil control and get oil in the mix and burn it up.
The car should pick up 13-15 mph on a well tuned 150 shot.
You dont need a wideband to tune a nitrous car... read the plugs and go off of MPH if its picking up mph you are going in the right direction on the tune.
Rich tunes dont hurt motors right away, thats why guys "think" they are safe, it slowly wears out the cyl. walls and takes the tension out of the rings.
After that you lose oil control and get oil in the mix and burn it up.
The car should pick up 13-15 mph on a well tuned 150 shot.
You dont need a wideband to tune a nitrous car... read the plugs and go off of MPH if its picking up mph you are going in the right direction on the tune.
I looked at my last slip and we picked up 6mph in the 1/8th froma 102 to a 108
I don't recall the et in the 1/8 .
In the 1/4 we went from a 129 to 133 and from 10.5 to a 10.0. Does that seem right?
I'll get back with further details.
03-17-2011, 10:41 AM
#15
Ok that makes sense to me. Thanks for the advice. Do you think its going to pick up from 129 NA to 140 + on spray? I've always read that the stronger the car is on motor the less it will gain on a small shot.
I looked at my last slip and we picked up 6mph in the 1/8th froma 102 to a 108
I don't recall the et in the 1/8 .
In the 1/4 we went from a 129 to 133 and from 10.5 to a 10.0. Does that seem right?
I'll get back with further details.
I looked at my last slip and we picked up 6mph in the 1/8th froma 102 to a 108
I don't recall the et in the 1/8 .
In the 1/4 we went from a 129 to 133 and from 10.5 to a 10.0. Does that seem right?
I'll get back with further details.
It only gains less because its already fast..... 150 hp will pick up more ET on a 12 second car than it will on a 9 second car.(hope that makes sense)
129 to 133 seems WAY off pace !
We went 122mph on motor to the 1/8th and 134mph with 175shot
Post up your tune and see if everyone here can help.
Jets? fuel? plugs? fuel pressure?
03-17-2011, 10:50 AM
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last weekend i went from a 114.4 mph on motor to 129.5 on spray with a 175hit....
i have read a bunch of advice that ATVracr gives to people and it has helped me with my setup a bunch.....
i have read a bunch of advice that ATVracr gives to people and it has helped me with my setup a bunch.....
03-17-2011, 01:44 PM
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I should be gainning aleast 10MPH. Still if your running 129 and hit with a 175 will it gain 15MPH. The question is if the motor is a bigger cube motor and it needs more fuel and air. Then a 150 jet for a kit designed for a stock 347 won' t be the same as for the bigger motor. Right or wrong? Am I totally wrong here. The jets are rated for a certain flow period. The motor is dynamic a bigger motor wants more flow to fill the cyl. If I have a 62-35 set up it's rating is say 150 from brand x. Will it still be 150 for say a 500" motor. I looked at my timeslip at lunch. I basically gained 5th's over the whole run. It was 5 at the 1/8 and 5 at the finish the MPH was 3 at the finish. I'll say it was the gearing on the MPH drop.
So the 150 shot that I am running is like a 75 shot on this motor.
I know check the plugs. I have but not right after a n20 pass. They look good after normal driving. Thanks for all the info. later.
03-17-2011, 02:23 PM
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it took me a while to get it right...i was kinda in the same boat as you as i was only gaining 10mph, came to find out that it was running super rich.... leaned it out some and bamm, mph went right up...
BTW, i have a ls2 which is a 364CI...
BTW, i have a ls2 which is a 364CI...
03-17-2011, 03:16 PM
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Its a 624/621 with 242 int and 250 ex on a 112+4 It was custom ground for this combo and use. I didn't have problems untill this build. It looks like I get to learn a new skill. Thats cool. I sent an e-mail to Harris and asked them about the jetting also. The reason I want a wide band is to check my self and see If I'm reading the plugs correct. Looking at doing a stand alone fuel system also.
I found a what looks like a good read for 10.00. Tuning to win its at www.4 seconds flat. I'm going to order it. I'm also going to talk to Flaco today.
I found a what looks like a good read for 10.00. Tuning to win its at www.4 seconds flat. I'm going to order it. I'm also going to talk to Flaco today.