Nitrous tuners - help needed
#2389547
10/18/17 10:00 PM
10/18/17 10:00 PM
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Joined: Aug 2005
Posts: 637 Sao Paulo, Brazil
dart_73_br
OP
mopar
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OP
mopar
Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
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Hello guys,
I'm new to nitrous and need some help with a small 100hp dry shot.
318ci on E100. Runs 0.85 lambda NA with 32 degrees of total timing.
My EFI has progressive controller for the dry nitrous so want to go 30%@3000 rpm > 100%@6000rpm.
Know this is just a small shot but I'm concerned with my 12:1 hypereutetic pistons. Can pull some extra timing to avoid detonaton if this is the case.
Should I pull lets say 10 degrees of timing to start the tune and them adding some timing back? Something about 0.75 lambda should be in the ballpark?
What about spark plug? I have AP5 AP7 and AP9. Using AP5 on NA.
Car is 3500lbs, 3 speed stick, 4.88 gears, 240/248@.50 cam. 280hp@5500 331ft torque.
Best 1/8 so far is 9.2s with 1.90 60". Want to go low 8's with the shot.
1973 Brasilian Dart E100, boosted 390"
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Re: Nitrous tuners - help needed
[Re: dart_73_br]
#2389901
10/19/17 05:10 PM
10/19/17 05:10 PM
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Joined: Oct 2015
Posts: 570 UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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Should I pull lets say 10 degrees of timing to start the tune and them adding some timing back? Something about 0.75 lambda should be in the ballpark?
I'm no N02 guru but I think you've got it wrong way around, @30% N02 hit you pull a bit out, @100% you pull a lot out not put more back in. The more efficient the motor is as in you add all the shot the more timing you pull out, thats what kills N02 motors Timing, not lean. On a small 100 shot its not quite so important than say a 250+ shot. Timing does not make power, its your combo that does. If your too rich on the tune it'll take more timing but you won't make the power you could with a "clean" tune and timing out. You could try something like 2 out @30% and 8 out @100 note your mph and put a little back in and see you if you mph better, if not pull more out, trial/error with each set up to get the sweet spot.
Last edited by rb446; 10/19/17 05:47 PM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: Nitrous tuners - help needed
[Re: rb446]
#2390032
10/19/17 09:37 PM
10/19/17 09:37 PM
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Joined: Aug 2005
Posts: 637 Sao Paulo, Brazil
dart_73_br
OP
mopar
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OP
mopar
Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
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You could try something like 2 out @30% and 8 out @100 note your mph and put a little back in and see you if you mph better
Sorry, I wasn't clear in my explanation. My EFI does progressive on nitrou s solenoids. Not timing. Timing will be pulled just once. As nitrous engage timing is retarded. So to be very conservative... I was thinking in pulling 10 degrees... but rethinking now... maybe it´s too much for such a small shot. I think to pull 6 degrees is ok them I´ll check everything spark plugs, WB O2 sensor and all the logs. I already tryed today without the juice on and cn see the engine doing the enrichment getting very rich (due to lack of nitrous), timing being retarded once nitrous is on and solenoids engagement ramping up. Everything set. Just need to buy a refill. Just want to know how much would be too rich? And what about spark plugs heat range? Br,
Last edited by dart_73_br; 10/19/17 09:39 PM.
1973 Brasilian Dart E100, boosted 390"
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Re: Nitrous tuners - help needed
[Re: dart_73_br]
#2393553
10/26/17 10:31 PM
10/26/17 10:31 PM
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Joined: Jan 2003
Posts: 2,155 Tucson, Arizona
clonestocker
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,155
Tucson, Arizona
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This is what happened to a friend piston hitting 150hp. What do you think went wrong here?
You don't spray KB hyper utectics(sp)
[img] [/img]
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Re: Nitrous tuners - help needed
[Re: clonestocker]
#2393664
10/27/17 02:53 AM
10/27/17 02:53 AM
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Joined: Oct 2009
Posts: 1,267 North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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I sprayed 150 shot on my demon with KB hyper pistons 100's of passes and never had a issue. I even tried 175 a few times. I always turned my timing down to *28 on pump gas and make sure you read the directions about ring gap.
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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Re: Nitrous tuners - help needed
[Re: dart_73_br]
#2393754
10/27/17 11:43 AM
10/27/17 11:43 AM
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Joined: Oct 2007
Posts: 4,210 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,210
New York
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Repeat after me 10 times: "make sure you read the directions about ring gap"
Boffin Emeritus
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Re: Nitrous tuners - help needed
[Re: dart_73_br]
#2393791
10/27/17 01:00 PM
10/27/17 01:00 PM
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Joined: Apr 2005
Posts: 1,322 Michigan
crlush
pro stock
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pro stock
Joined: Apr 2005
Posts: 1,322
Michigan
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Been spraying my kb hyperutectics with 150 shot for years, never had a problem, freshened it up around 8 yrs ago and they looked great. What motor is the cracked piston out of?
Last edited by crlush; 10/27/17 01:02 PM.
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Re: Nitrous tuners - help needed
[Re: crlush]
#2393898
10/27/17 05:18 PM
10/27/17 05:18 PM
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Joined: Aug 2005
Posts: 637 Sao Paulo, Brazil
dart_73_br
OP
mopar
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OP
mopar
Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
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Been spraying my kb hyperutectics with 150 shot for years, never had a problem, freshened it up around 8 yrs ago and they looked great. What motor is the cracked piston out of? How much of total timing, fuel and AFR? Br,
1973 Brasilian Dart E100, boosted 390"
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Re: Nitrous tuners - help needed
[Re: crlush]
#2409588
11/27/17 01:45 PM
11/27/17 01:45 PM
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Joined: Aug 2005
Posts: 637 Sao Paulo, Brazil
dart_73_br
OP
mopar
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OP
mopar
Joined: Aug 2005
Posts: 637
Sao Paulo, Brazil
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Hello guys, just used my first bottle. Using a #51 nitrous jet and the dry setup on E100. Everything went fine. My tune still on the rich side. 0.74 lambda at 100% nitrous @WOT. i'm looking for 0.78-0.8 range. So will increase jetting to a #62. I'm retarding 5° and total timing is coming from 32>27°. How do I know that I can add some time back? I can't see much difference on spark plugs. Everthing looks fine. Also as I´m using it progressively.. I couldn't feel a big improvement in horsepower on the street. Next tune I'´ll do it on the strip. Br,
1973 Brasilian Dart E100, boosted 390"
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