I installed a nitrous dry kit from harris speed works today on my 99 cobra. The car is mainly stock except for exhaust. Had the car at the track about a year ago and ran a best of 13.72. Ran the car tonight on the nitrous with 100hp. jet and ran a 13.67, 13.50 and a 13.28. This is not much of an improvement. I checked to make sure the nitrous is spraying and it is. Does anyone have any idea what my problem with it could be? Thanks

 

What kind of times should I expect with 100 shot , It went a best of 13.72 without it. Thanks

 

a 1/2 second is a prety good improvement. But is sounds like you probably have some traction issues. Nitrous produces LOTS of torque, so you are probably generating some wheel spin that is keeping your ETs down.

 

Something is defenitly wrong. Either your launching on the nitrous and the tires are spining, or the screen is cloged in the seliniod.

I went from a 12.33 @113 MPH to a 11.20 @121 MPH with a Nitrous Express Wet 100 Shot.
Also, Bottle pressure has ALOT do with the horsepower ratings of the shot. Most companies rate their horsepower shots at 950 PSI.
If your bottle pressure is lower than that then you won't get the horsepower that the companie claims. You should definatly get a bottle heater and a gauge to monitor whats going on.

I found on the dyno that if your bottle pressure is below 950 psi then every 50 psi is around a 15-20 horsepower loss.

Also here is another thing I do. When I'm at the races and my bottle pressure is reading low like 850 psi, I will up the nitrous jet to make up for the lack of pressure. If I'm running a 150 shot which is .62nitrous/ .33fuel jet size I wil put a .67 nitrous jet which will be the same a 150 shot with lower bottle pressure.

 

I have a different bottle to try next week that has a pressure guage on it. I was coming off the line fairly easy trying to keep the tires from spinning and I'm not spraying until I'm in 2nd gear. I was getting tire spin in second. I had terrible 60' ft times,, all were around a 2.3. The pass that I ran a 13.65 was at 109mph. So is my 60' time whats hurting me? Thanks for everyones input so far. I'm fairly new to this and appreciate all the help I can get. I can post time slips tommorow if that will help figure out anything.

 

ya, 109 mph will put you into the 12's. invest in some drag radials and suspension work next.

 

I would say bottle pressure is your problem.

 

my old notch ran 12.50's at 108 trap speed.

you should cut 1 full second your ET w/ 100 jets or something is wrong.

also, you weren't spraying til 2nd, so you might get a 12.30-12.50 pass if you can hook, anything under 1.8x 60' is a need for more traction

 

as the bottle gets lacking of nitrous. say u have a 10lb bottle u spray a few times, and your down to 8lbs. Its not going to be as strong as if it had the full 10lbs. even with the pressure up. But your problem sounds like traction issues. A 50 throws me back pretty good on a full bottle up at 1000psi. So i sure a 100 will really do some work. If u dont have a warmer get one. Guage too. I have a wet nx kit but NOS warmer. got it for 50 bucks off a buddy, easy as hell to install and is well worth it.

 

You trapped at 109 man, thats good for 12's. Get some drag radials.