Nitrous with Auto

[Eagle_Summit]

I've been reading off and on that "Don't redline with nitrous!!" Well my car, being an auto, usually redlines when you get on it, so what am i suposed to do with nitrous?

 

[Chuck_3]

i used nitrous with my auto...didnt go past redline...just got there quicker

 

[peanotation]

just dont spray at redline.....

 

[DSMJim]

You can hit your revlimiter with nitrous it's not a problem. I would like to see exactly where your reading that says "Don't redline with nitrous". Please do us all a favor and don't direct us to some bananna message board with some idiots talking on it. Direct me towards a Nitrous company that states that (other then NOS because they say you can't do anything with nitous. Oh you have a 4 cyl dont spray more than 50hp EVER, what BS).

Basically what I'm saying is many guys who have opinions on Nitrous and how it works have never had it or have limited knowledge with it.

I have done the following:

Done Burn outs with the nitrous on (by accident but still)
Hit my revlimiter in 1st, 2nd, 3rd, 4th with nitrous
Mis shifted into the wrong gear with nitrous
My dads auto maxima, hit rev-limiter with nitrous (200hp shot)

And not had problems, there simply is no prolblem with the revlimiter and nitrous. The maxima is a fuel cut revlimiter not a spark cut either and it still is not a problem.

 

[Chuck_3]

i never had problems with my auto and nitrous on my jetta i always let off the button before itd go that far and the only time it really spins the tires is on N20

 

[Eagle_Summit]

ahhh, alright, thanks guys! I just wanted to know sum simple questiong i guess before i buy the setup (might buy turbo instead).

 

[peanotation]

pardon my ignorance, but if you hit your rev limiter, don't some cars have a fuel cut there? and wont the complete lack of fuel just make the nitrous detonate? sorry if that's stupid.

 

[GSGoinFast]

pardon my ignorance, but if you hit your rev limiter, don't some cars have a fuel cut there? and wont the complete lack of fuel just make the nitrous detonate? sorry if that's stupid.

I had heard the same thing, that when you hit fuel cut you go super lean cause of the nitrous and you blow up. well that doesnt really happen. last night i hit the rev limiter in 2nd while spraying... i got so worried i ####ed something up. so i drove home, and checked all the plugs to make sure they werent melted to the head or something. everything was cool. it was running fine, i was just paranoid.

with an auto, you dont hit fuel cut do you when you redline? like you get to the redline, but you dont actually fuel cut do you?

 

[peanotation]

I had heard the same thing, that when you hit fuel cut you go super lean cause of the nitrous and you blow up. well that doesnt really happen. last night i hit the rev limiter in 2nd while spraying... i got so worried i ####ed something up. so i drove home, and checked all the plugs to make sure they werent melted to the head or something. everything was cool. it was running fine, i was just paranoid.

with an auto, you dont hit fuel cut do you when you redline? like you get to the redline, but you dont actually fuel cut do you?

well, I drive an automatic 94 mitsu galant, same engine/suspension as a 2G, and I know that the new galants have fuel cut about 200 RPMs past redline. I dont know on you 2 or 1Gs, but I don't ever get the fuel cut off by the car no matter where I am on the tach.

 

[DSMJim]

There are two answer to the fuel cut question.

DRY KITS: If you have a dry kit only nitrous is injected into the motor and the fuel comes though the fuel injectors by raised fuel pressure. If fuel is cut, then there is no fuel to ignite. No fuel to ignite means nothing is happening and the air that is pulled in normally along with the nitrous is just shot out the exhaust port. Nothing happening is nothing happening. Remember nitrous is not flammable so a spark on nitrous will do a whole lot of nada...

WET KITS: If you have fuel cut with a wet kit your car does go lean however there is enough fuel in the system for the nitrous (because it's porportoned properlly by jets) that its only slightly lean from the fuel not being present for the air normally injested. Even with this slightly lean condition power is reduced so much that it simply can not blow up your motor.

If you were to have prolonged fuel cut over a long period of time with a wet kit running lean it would eventually blow up your engine but nobody gets 10 full second of fuel cut and keeps their foot right to the floor for that full 10 seconds.

Nitrous does not detonate it's not a fuel and is not flamable, it's air. Detonation is fuel igniting prior to the spark plugs doing it. Thats FUEL igniting, not nitrous it can't ignite.

 

[Colossus]

You'll have fuel cut, causing a drop in fuel. Sure. But, read the bottle of nitrous. Contents non-flammable. Hmm....doesn't that mean it won't combust really? Not sounding like an ass, but if it's by itself....and can go under way more psi/pressure in the bottle than it will in your motor...it's not going to detonate.

Nitrous in an auto is fine. It'll shift ok, auto tranny's can shift as fast as .05 of a second. Way quicker than you, or anyone else can. Hitting your revlimter, yeah, you can do it in neutral. Don't spray in neutral. If you're staging the car, and holden the gas and the brake, don't arm the nitrous. As soon as you launch, and are above 2.5K rpms', arm it, and it'll kick in automatically upon WOT.

Easy as that. My GS is auto w/ nitrous.

 

[chevota]

I have only this tidbit to offer: Normally my auto tranz shifts before it goes into the fuel cutoff zone (obviously), when on wet nitrous it sometimes revs into the fuel cutoff before the tranny could find it's way into second gear. Not a big deal I guess, but counter productive. Also, it seems to shift slower under full thottle, and slower yet on nitrous. If I let off a bit just a split second as it's ready to shift it seems to work better. Btw, my nitrous is throttle activated. Before when it was button controlled I had similar luck cutting flow while it shifted.

 

[peanotation]

I have only this tidbit to offer: Normally my auto tranz shifts before it goes into the fuel cutoff zone (obviously), when on wet nitrous it sometimes revs into the fuel cutoff before the tranny could find it's way into second gear. Not a big deal I guess, but counter productive. Also, it seems to shift slower under full thottle, and slower yet on nitrous. If I let off a bit just a split second as it's ready to shift it seems to work better. Btw, my nitrous is throttle activated. Before when it was button controlled I had similar luck cutting flow while it shifted.

thats wierd, because my auto shifts like shit, but when i'm at WOT and spraying, it shifts really fast and accuratley, almost as if it has a brain and realizes it better switch fast. i used to turn off the nitrous momentarily between gear shifts, and this was stupid because the car can shift fine while spraying, and the car i was racing would pull so hard on me during that half second.

 

[chevota]

Every car is different, you're lucky. Damn computers... I wish I could just logon with a laptop and adjust shifting, fuel, rev limit etc. The older stuff like the '70's tranz in my chevota is nice and simple to adjust shifts to your liking. There's just not much info for newer cars.

 

[NX RuLeZ]

To all,

Whilst running Nitrous during launch,(NX stictly forbids hitting the fuel cut! Black and white from them) i hit redline in first gear.. (6500) upshifted to second.. waited to see what'll happen.. (fuel cut at 6700) engine reved to 7000RPM! up to third.. and within 3SECS, i lost compression in my no four cylinder. Upon top overhaul, one of the valves cracked!
This was on the 75shot setting! So i strongly urge fellow nitrous users to check their fuel cut limit and don't hit it with nitrous on.

 

[DSMJim]

I have only this tidbit to offer: Normally my auto tranz shifts before it goes into the fuel cutoff zone (obviously), when on wet nitrous it sometimes revs into the fuel cutoff before the tranny could find it's way into second gear. Not a big deal I guess, but counter productive. Also, it seems to shift slower under full thottle, and slower yet on nitrous. If I let off a bit just a split second as it's ready to shift it seems to work better. Btw, my nitrous is throttle activated. Before when it was button controlled I had similar luck cutting flow while it shifted.

My dads maxima is like this and we have been batteling it for a while now trying to figure out what is doing it and trying to make it stop. Honestly the problem is the computer controlling the trans has too much control and just wants to do stupid stuff when more power is there like shift slower for comfort or something.

This is typical of many auto trans cars, some models are not like this, other are. My dads 95 and 97 maxima were not like this, his 02 is and it's a bi***. THe 3-4th shift is really long when he sprays over 150hp shot.

We did a window switch type thing using an NX Maximizer to control the onset and shut off of the nitrous and control the nitrous per gear etc. If you really want maximum nitrous control the maximizer is the shit.