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Nathaniel
Dodge Dakota
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10/23/2002
09:39:49
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 Subject: sneaky pete, O2 and open loop
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I was under the understanding that with my Sneaky pete system the o2 sensor would tell the computer to add more fuel. I have read this in multiple posts. Then I read on the modes of opperation on speedtweaks under "what is open and closed loop operations" that at WOT the computer does not use the o2 sensor.
How does the computer know to add extra fuel for the lean condition?
If i blow it up i guess my truck will have the 360 sooner!!
Thanks,
Nathaniel
'98 5.2, m1,Mopar PCM, cold air, Mod TB, Flowmaster catback, sneaky pete 40hp.
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psychoRT
Dodge Dakota
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10/23/2002
09:59:25
| RE: sneaky pete, O2 and open loop
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What shot size are you running. I dont know that much about the 5.2's I am running a R/T but i know nitrous.
Does your truck have a MAF setup like a LS1(Trans am/z28) or are you just talking about spraying the Iat sensor.
Nitrous in genral all depends on octane rating dont listen to all that bs about you need to dump massive amounts of fuel in there to stop it from blowing up. A wet system is the safest yes but that is because the nitrous atomizes with the extra fuel and makes the combustion chambers cooler and gives you that little bit of fuel so you dont lean all the way out.
I have used both wet and dry systems on my R/T both were 100 shots. The wet ran fine, but i did experiance some detonation with the dry. But that was because computer ups the timing between shifts 20 degress and it was a hot summer in texas. All that was needed was a bottle of octane booster and no detonation at all.
Higher octane slows the burn thus making it cooler. Hot spots in the combustion chamber is a main cause of detonaiton and how a motor gets destroyed. If you slow and cool the burn process you are fine. Also use colder plugs if i remember correctly its 3923's by autolite. This will also cool off the chambers. And dont hot lap nitrous you are only asking for trouble let your truck cool off a little between rounds.
I hope this info helped you out. any questions give me a hollar.
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paysonbadboy
Dodge Dakota
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10/23/2002
10:24:27
| RE: sneaky pete, O2 and open loop
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Are you saying you are running a 100 shot of Nitrous without adding any fuel?
I've never really seen all the ways it can be done with injection, but of course on carberated engines you have fuel being added with the nitrous. I mean, you HAVE to add fuel to go along with all that oxygen you are adding... So how are you getting the fuel injected engine to add enough fuel with the nitrous to get that 100 HP? And did you have to go to bigger # injecters?
I am curious. I have a '98 Chrysler car I'd like to get sneaky with (not the name sneaky pete, I mean sneaky by being STEALTH with what's under the hood ) and I didn't think I could do such a thing very easily. I was thinking more of a small blower, but there isn't much room!
http://www.paysonarizona.net
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psychoRT
Dodge Dakota
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10/23/2002
11:01:04
| RE: sneaky pete, O2 and open loop
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I already ran rich, if you do the math on the injectors for a R/T you only need 19# with the amount of psi they are pushing. But they come stock with 23.3#. I have used Nitrous Express both times thusly because i sell it and hate NOS with a passion. But i have ran there system as well in a 97 eclipse i had it too had a 100 dry shot. No fuel up grades.
Remeber also fuel injected is totally diff. from injected. There is alot of things that tell the motor to maybe add a little more fuel. pre cat o2 sensors and sensors esle were in the motor. Carb is plan and simple it sprays this amount and that is what you get.
Octane rating is really what judges how much nitrous you can run same as Turbo cars/super cahrged. Cooler running chambers means less detonation. Thus the reasoning behind race gas.
It slows the burn and therefore cooling the chambers and then cold plugs help in that as well.
Detonation is a hot spot in the motor that pre ignites the mixture.
And nitrous use is really dependent of the bore size of the motor. Bigger bore bigger kit. look for a starter nitrous kit for a big block they start out at like 150 shot. Because of the bore size.
You always start small let the car get used to it and then you progress with the shot size. If your car dont like it then back off a notch of fix the problem. Octane rating will fix most of these.
Now im not saying get a dry 500 shot and use octane booster lol, you better be using some 121 octane for that one lol and moth balls hehe. But most car can handle a 50 dry no problem and a 100 depending on the car. I have used nitrous for a while now and know the little tricks and so forth to battle the issues that might come about. And a 100 dry isnt the same size hp rating as wet. A 100 dry is really only like a 60 hp after it process's thru the motor. So you can get away with it on a dry shot. And that all was done without retarding the timing which really isnt needed unless your going with someting over a 100 shot.
Its all on the car and what you know about your car. If the car is a pos and you add a 250 shot sure its going to blow up. your car is only as good as its weakest link. Remember that when using nitrous. But generally you can run a 50 all day long no problems.
Hope that helps.
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psychoRT
Dodge Dakota
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10/23/2002
11:13:34
|  RE: sneaky pete, O2 and open loop
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ohhhh yea im the king when it comes to sneaky. Lol i ran a Nitrous Express Incognito kit. It comes with black nylon hose so you can see it. I used a 2.5 motorcyle bottle and cut out the glove box. i put the bottle in there with a 90 degree fitting and ran the solenoid under the dash then the black line out the grommet in the engine bay behind some stuffand up thru the back of the intake and zip tied the hose right over the throttle bodie. Then i use the cancel button for my cruise control as the switch to activate the nitrous. and a arming switch under my seat in arms reach. You look in the engine bay nothing you look in the truck you see nothing. Perfect system and can be good up to 150 hp. I was only spraying 100 shot though.
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