[cheers007]

I have a 93 trep with all the goodies I can think off other than NOS. I have heard so many stories about how harmless it is, and how harmfull it is. I don't care how it affects cars in general, I care about how it affects a 3.3L. Anyone know (hopefully from experience) if having a 75 shot NOS will tear up the engine any? I hope someone out there has some insite on this. Thanks.

 

[RCE2WIN]

According to all my research on NOS, 75hp is the biggest shot you can give to a stock motor. As long as you don't have any problems with the motor before, it should be OK when you hit the button. It really is the biggest bang for your buck when you do the $/hp math. Let us know if you decide to run your 3.3 on a bottle.

 

[gr8crash]

when NOS is ran properly it will do no more harm to your engine then if that engine wsa making that HP on it's own, as in id u have a 150hp and u give a 50 shot to do 200hp, it wil not put any more strain on the engine then if it was alrady making 200hp. the only thing to really worry about it not to lean out, run a wet systesm (fuel and nos) to lessen the chance of lean out. also try not to use NOS in 1st gear, tire spin, and do it above 3000rpms, and no longer then 15 consecutive seconds at a time. and if you control it manually, make sure that you let the button of between shifts. like when the car shifts the fuel injectors rurn off for a moment, but if your injecting NOS during the hift it can get to much and you can actually have your head lift form the block, have heard of this happening before. just be careful and run it right and you'll be fine. also make sure you keep higher octane sumtin in the 90's, unles your only gonna use it at tracks then fill up with 94 or sumtin, but you don't come across rice at the track al the time ;-)

 

[cheers007]

here's the thing that makes me hesitate on putting nos. First, I have the Superchips ECU installed, and the performance tech told me a rumor that if you have the Superchips installed, you can't run NOS because of the possibility of engine detination. So i would sure hate for my trep to blow up on me. Second, Aaron states that I should run a wet system, but from reading brochures and web sites they all say that for a natural aspirated engine should only run on a dry system while turbo charged engines run wet. the way the tech explained it to me is that i'd have a greater chance of leaning out on a wet system becuase the stock fuel system might not handle NOS. No one knows, and that's the biggest problem. Plus, I almost forgot to mention that this tech is a rice burner tech, so if anything, he's giving me a general answer and not a specific answer. So he might be right, and he might be totally off. I thought I'd throw that out there and see if anyone can help me out. I'm all for the Intrepid to go FAST, but the thing is that I want it to keep going, lol. By the way, just off the topic a sec, why the hell does Mopar make perfromance parts for everthing exept intrepid (3.3)?!?! Thanks all!

 

[cheers007]

One more thing. I e-mailed NOS (Holley) and asked them if they had a kit for my trep. They told me this "We do not have a kit for your vehicle due to the
non bypass style fuel system." I'm not a pro, so what does this mean, and does this mean that we shouldn't use NOS at all? All and any help is greatly appreciated from all my fellow pround Intrepid drivers!

 

[Warlord187]

Originally posted by cheers007:

say that for a natural aspirated engine should only run on a dry system while turbo charged engines run wet.

That is basically correct. In order to run a wet system, other engine modifications will have to be made. With a wet system, you more than likely will have to get a bigger fuel pump also.

A progressive shot would also be recomended.

I know this was stated earlier, but I will say it again. The shot should NOT be held for more than 15 seconds at a time, should be done above 3000rpms, should NOT be done while shifting, and should NOT be done in 1st gear.

Althought, I was watching the TV show Crank & Chrome the other day. On there they were hooking up a 100hp NOS shot to a newer Corvette. They were using a wet system. They didn't have to make any other modifications to the car. In fact, the Corvette owner DIDN'T want to add a turbocharger or a supercharger. The reason why they didn't go any more than a 100hp shot was because the owner didn't want to put a bigger fuel pump on. Granted, an Intrepid is no Corvette, but it makes one think.

So I guess after reading all that, who the hell really knows.

 

[cheers007]

Do they even make bigger fuel pumps for our cars??? I can hardly find fuel that fits our cars, much less a fuel pump, LOL So no one on this whole forum has ever tried to put NOS on their treps???

 

[gr8crash]

i stil don't understant how with a wet system you run a greater chance of leaning out? the wet system is injection a mix of fuel and NOS, so you would have a very small chance to lean out. and bigger fuel pump, ours should be fine if flowing enough fuel. then engine should handle NOS fine, a nice wet 50 shot should be fine. the only thing i can think of is that the O2 sensors may see teh extra fuel and cut back on it, that i am not sure of. but the only way to do it is try it and fine out.

 

[Warlord187]

Originally posted by cheers007:
So no one on this whole forum has ever tried to put NOS on their treps???

Not yet. I don't want to void my warranty.

As for having to get a bigger fuel pump, as long as you stay under 100hp shot, you should be fine. I have plans to put a 75hp shot on my car, but that is in the future.

 

[cheers007]

The theory behind leaning out on a wet system is based on the idea that when the engine rpm is in the high range, the ratio of NOS to fuel in the mixture is further on the NOS side than fuel. The fuel pump can not output the amount of fuel needed to properly mix with NOS, therefore a greater amount of NOS would be in the chamber (hence burning pure NOS almost). Again, this is a theory that was explained to me. I have no idea. I'm going to do more research and I'll let you all know what I decide to do.

 

[Warlord187]

Originally posted by cheers007:
The theory behind leaning out on a wet system is based on the idea that when the engine rpm is in the high range, the ratio of NOS to fuel in the mixture is further on the NOS side than fuel. The fuel pump can not output the amount of fuel needed to properly mix with NOS, therefore a greater amount of NOS would be in the chamber (hence burning pure NOS almost). Again, this is a theory that was explained to me. I have no idea. I'm going to do more research and I'll let you all know what I decide to do.

Yup. That is why if you use a big hp shot of NOS, you will need to get a bigger fuel pump so you won't lean out.

 

[cheers007]

Ooohhh, ok so if I used at Max a 75 shot wet kit, I shouldn't have any problems, right?

 

[Warlord187]

Originally posted by cheers007:
Ooohhh, ok so if I used at Max a 75 shot wet kit, I shouldn't have any problems, right?

I would think so. I would get more opinions on that first.

 

[cheers007]

Now the only thing I have to really worry about is the rumor of "If you have a superchips ecu, then putting NOS will detonate the engine." I would hate to have that rumor be true. Can anyone say for sure if that's true or not?

 

[Wutang15m]

Detonating the engine wont be a problem these engines are tough. But now as for the transmission thats where youre problem might be

 

[Djnrg]

Engine detonation has nothing to do with an engine being tough. It has to do with whether the air/fuel mixture is so lean that the mixture heats up so much under compression, that the mixture explodes before it is supposed to, damaging the pistons.

Hey Cheers, if you have a Superchips modified ECU, then yes, nos will probably damage your car. What superchips mods due to our cars, is advance the timing, which is why you need high-octane gasoline--It prevents detonation, because higher octane gas is more resistant to ignition. Thats why race car engines backfire a lot, anyways.... With your timing advanced, you need higher octane gas to keep it from detonating, so adding NOS will cause a leaner air/fuel mixture, and will lead to detonation. If the shot of NOS is small enough, that your stock fuel pump can support it, then you will be ok. If your fuel pump cannot handle it, you will be needing some new pistons!!! Again, a small shot of NOS (no idea how much) would probably be ok, but you would have to ensure that you don't get a lean mixture and therefore detonation by measuring the temperature of the exhaust gasses.

If you need to know anything else, just ask...

 

[cheers007]

So, Djnrg, are you saying that by returning to a stock ecu that it will illiminate the detonation? And just for the record, I use 93 octane fuel now and I just had my transmission upgraded with stiffer clutches. By the way, 1st gen transmissions have 32 clutches!! FYI

 

[Djnrg]

By going with a stock ecu, you could probably get a bigger shot of NOS with no detonation, than the superchips ECU. You probably could get away with some NOS with the superchips ECU, but again, you would have to make sure that you weren't running lean. (you would have to do this anyways with nos on a stock setup) An easy way to tell if the mixuture is lean, is to measure the temperature with a tail pipe probe and compare it to stock levels. If the temp is too high, then its probably too lean. (Your engine won't necesarily heat up a great deal more.) OR, you can measure the voltage from your oxygen sensors to check on the oxygen level, but I forget exactly how to do this. But again, with your Modified ecu, just be careful how much NOS you shoot into her, and you SHOULD be ok. BUT, I don't care what anyone says, NOS will kill your car, if not sooner, than later! And MUCH sooner if someone doesn't know how to use it properly, and to fire it right...

Hope that helps dude...
I'm still waiting for a turbo or a supercharger!

 

[cheers007]

I would love to have a supercharger instead. I'll let you all know what happens with the NOS. Thanks all for your inputs.

 

[crombie]

NoS

I've been interested in shooting some nitrous in my car. However; a buddy of mine with a 99' Intrepid got nailed by a state trooper for buying and selling large amounts (illegal as far as I know here in Maryland). SO I think I'll stay low for a while...