NOS and Terminator

[Black Gold 380R]

OK, I know this is not the SVT site, but I went over there and they do not have a search engine. Atleast they don't for non-members. So, I’m turning to my FNSweet brothers for help. I talked to Randy (360Rocket) about this a little last night and got his point of view.

Anyway, I want to put nitrous on my 03 Cobra. The car is bone stock and I live in an area where tuners and good mechanics are pretty much nonexistent. So, my question is how much NOS can I safely run on my 03 Cobra without having to retune the car or worry about snapping the half shafts? I know nothing is guaranteed and anything can happen when using NOS, but I’m looking for general or overall experience you guys have with this modification.

I have already purchased a kit from Summit:

http://store.summitracing.com/partde...5&autoview=sku

This kit is made specifically for the 03/04 Cobra and the instructions say it can be used on a stock Cobra. The only thing I need to do, according to the instructions, is change and re-gap my spark plugs.

So, I would appreciate any advice, recommendations or experience you have with NOS and/or the 03 Cobra. Thanks in advance for your time and assistance.

Glenn

[U.S.BlueStage2]

http://www.svtperformance.com/forums...notune+nitrous

http://www.svtperformance.com/forums...notune+nitrous

Here are two threads from SVTPerf.com.

I would say that you need to have some sort of tune for the nitrous, and I personally would not run more than a 125 shot.

FWIW, a lot of guys run the Dynotune Dry Kit on the Cobra.
http://www.dynotunenitrous.com/store...?idproduct=119

[2KRoushGT]

I dont think you have to really worry to much about the half shafts breaking. Most of them from what I have seen break on the launch when using slicks or drag radials. When you use the nitrous it wll be turning on around 3500 RPMs so the shafts are already turning so there shouldnt be to much stress on them.

[360Rocket]

Originally Posted by 2KRoushGT

When you use the nitrous it wll be turning on around 3500 RPMs so the shafts are already turning so there shouldnt be to much stress on them.

unless you get partial traction, and you get any kind of wheel hop, and then you WILL, not if, break a halfshaft. I was out at the 60 foot well above 3500 and got wheel hop and bang! end of your ride.

[MachMan]

If you're going without a tune you MUST use a wet kit. Without a tune you cannot retard the timing enough to make it safe for anything bigger than a 100 shot. Some will say "But I've done a 150 shot with no tune for years". They're lucky and just plain abnormal. The safest way to go is a dry kit with a tune. you'll need bigger injectors though.

If you go tuneless, mix in 2 or 3 gallons of 100 octane...

[360Rocket]

I would not go above 75 on a dry kit. and the golden rule is remove one degree of timing for every 50 hp of nitrous introduced. Your stock tune will not do that for you. Find a good tuner and get a flip chip tune put on the car for nitrous use. Get a window switch, get a fuel pressure shut off. You can never have too many precautions or safty measures when it comes to nitrous.

[MachMan]

Originally Posted by 360Rocket

I would not go above 75 on a dry kit. and the golden rule is remove one degree of timing for every 50 hp of nitrous introduced. Your stock tune will not do that for you. Find a good tuner and get a flip chip tune put on the car for nitrous use. Get a window switch, get a fuel pressure shut off. You can never have too many precautions or safty measures when it comes to nitrous.

If you mean you wouldn't go more than a 75 shot with a dry kit without a tune I agree... I wouldn't do a 25 shot on a dry shot without a tune. I hope you're not saying a 100 dry shot is more dangers than a 100 wet shot when tuned though. Most people running big shots on our mod motors these days are using dry kits now. I can think of several right now that are running 225+ dry shots.

[2KRoushGT]

Originally Posted by 360Rocket

unless you get partial traction, and you get any kind of wheel hop, and then you WILL, not if, break a halfshaft. I was out at the 60 foot well above 3500 and got wheel hop and bang! end of your ride.

I saw those pics you F'ed those things up!

[360Rocket]

Originally Posted by MachMan

If you mean you wouldn't go more than a 75 shot with a dry kit without a tune I agree... I wouldn't do a 25 shot on a dry shot without a tune. I hope you're not saying a 100 dry shot is more dangers than a 100 wet shot when tuned though. Most people running big shots on our mod motors these days are using dry kits now. I can think of several right now that are running 225+ dry shots.

No I'm O.K. with a dry shot, just as long as you have a tune, enough fuel pump and injector to support it. Mines a 100 shot, tune, and 2 Ford GT pumps.

[360Rocket]

Originally Posted by 2KRoushGT

I saw those pics you F'ed those things up!

why thank you, anything worth doing is worth doing well....

[Black Gold 380R]

Thanks for all the replies and recommendations. I called Holley (NOS) and talked to their tech department. I was told that if I follow the directions supplied with the wet kit I purchased from Summit all I need to do is go to a colder plug. They said for a 100 shot on their wet kit I do NOT need a tune in order to safely run that kit.

I also asked about the window switch and was told it is always good to have additional safety features, but it is not needed. They said because the engine is forced induction that they have not heard of people having a puddling problem. However, I will feel more comfortable with the window switch so I WILL be installing one.

I WILL also ensure I run a higher octane fuel when I run the NOS. I do not really beat my car and I will probably only see the track once a month, if that. So, I do not expect to be running the NOS that often.

Also, according to the Cobra guy’s wheel hop is a real issue. However, they say running a drag radial really helps in that area. I have a set of BFG Drag Radials and I will be running them and launching a little on the soft side. I’d rather lose a little ET/MPH than snap a half-shaft at this point in time.

Thanks again for the advice and recommendations. I’ll let you guys know how it goes as soon as I install the system and make a pass down the track.

[Star Driver]

Get ahold of Tim at Modular Powerhouse, he can answer your questions.

[MachMan]

Originally Posted by Black Gold 380R

Thanks for all the replies and recommendations. I called Holley (NOS) and talked to their tech department. I was told that if I follow the directions supplied with the wet kit I purchased from Summit all I need to do is go to a colder plug. They said for a 100 shot on their wet kit I do NOT need a tune in order to safely run that kit.

I also asked about the window switch and was told it is always good to have additional safety features, but it is not needed. They said because the engine is forced induction that they have not heard of people having a puddling problem. However, I will feel more comfortable with the window switch so I WILL be installing one.

I WILL also ensure I run a higher octane fuel when I run the NOS. I do not really beat my car and I will probably only see the track once a month, if that. So, I do not expect to be running the NOS that often.

Also, according to the Cobra guy’s wheel hop is a real issue. However, they say running a drag radial really helps in that area. I have a set of BFG Drag Radials and I will be running them and launching a little on the soft side. I’d rather lose a little ET/MPH than snap a half-shaft at this point in time.

Thanks again for the advice and recommendations. I’ll let you guys know how it goes as soon as I install the system and make a pass down the track.

A window switch helps with more than just puddling. A miss shift and smacking the rev limiter on the bottle can turn ugly also. Make sure to set the disengagment RPM about 300 RPMs below the rev limiter. The 100 wet shot without a tune the Holley guy told you is pretty much exactly what I told you. Anything bigger than that and the stock tune will need to have the timing retarded. The stock tune is already conservative enough to work for up to a 100 shot if you run a few gallons of 100 octane.

[MachMan]

Originally Posted by 360Rocket

No I'm O.K. with a dry shot, just as long as you have a tune, enough fuel pump and injector to support it. Mines a 100 shot, tune, and 2 Ford GT pumps.

I've got a wet kit spraying a 150 shot, but if I go any bigger I'll actually be converting it to a dry kit. That probably won't happen since I have a Paxton NOVI 2000 about to be installed. I'll probably pill the nitrous back down to a 100 shot and keep it wet.

[360Rocket]

Kind of curious Glenn, why nitrous? why not, pullies? tune? x-pipe and exhaust? More Horsepower, less risk.

[Black Gold 380R]

Originally Posted by 360Rocket

Kind of curious Glenn, why nitrous? why not, pullies? tune? x-pipe and exhaust? More Horsepower, less risk.

Randy,

I have an uncatted X=pipe and magnaflows already installed. I wanted to step up to another blower, but it is basically a bang for the buck issue. To get 100HP from a new blower or other mods will cost me thousands of dollars. Where as a 100 shot of NOS will only cost me a few hundred dollars and from what I hear the Cobra can handle it easily if installed correctly.

Also, the Cobra is my daily driver and having the car run stock during normal driving and then running a power adder at the track is also appealing to me.

The bottom line for me is money. The problem is most of us have Champaign taste on a kool-aid budget and I'm no different.

[Black Gold 380R]

Originally Posted by MachMan

The 100 wet shot without a tune the Holley guy told you is pretty much exactly what I told you. Anything bigger than that and the stock tune will need to have the timing retarded. The stock tune is already conservative enough to work for up to a 100 shot if you run a few gallons of 100 octane.

Yes sir, that is what you told me and I thank you. However, I called the Holley guys before I read your reply. But, it is also good to get multiple views that all say the same thing .

I appreciate your advice and I'm going to follow it and see what happens.

[360Rocket]

Originally Posted by Black Gold 380R

The bottom line for me is money. The problem is most of us have Champaign taste on a kool-aid budget and I'm no different.

makes sense, I'm in the same boat.

[RoushMan]

Originally Posted by 360Rocket

No I'm O.K. with a dry shot, just as long as you have a tune, enough fuel pump and injector to support it. Mines a 100 shot, tune, and 2 Ford GT pumps.

And thats only his first stage

[2KRoushGT]

Originally Posted by Star Driver

Get ahold of Tim at Modular Powerhouse, he can answer your questions.

+1 on talking to Tim at Modular Powerhouse about what you want to do. He really knows his stuff.