Nitrous Oxide - rpm ?




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skanknova
05-24-2011, 08:19 PM
So I'm currently spraying a HSW sudden impact wet kit with jets set up for 100shot, my cars a mostly stock 99 ls1 with a lid long tubes no cats and a cutout , and a built trans with the stock stall , there's no tune on the car yet, last Friday the car went 12.299 at 117 on street's spinning badly into second , the window switch is set right now to spray between 3500 - 6200 this is exactly how I bought the car and this is the previous owners set up
I know nothing about nitrous, but 3500 seams a bit late for the hit , I would think that it should be closer to 2500 then 3500 , the cam is bone stock and the converter should be in full lock at 2500 am I wrong? it would be nasty to go 11.99s on streets and I was hoping that I could get a tenth or two if I started the hit a Lil sooner, ? advice? warnings? I dont want to risk backfire by spraying to soon, what would be an ideal time for the hit?


skanknova
05-24-2011, 09:00 PM
found some good info in the faq so ignore me im a noob

PlowBoy11
05-24-2011, 09:46 PM
Dang good run is there anything else you have done to the car other than what you noted. I have a 98 stock with dry 100 shot and the best I could do was 12.4 with Et DRs and 4.10 gear.


Gary Z
05-25-2011, 02:06 PM
found some good info in the faq so ignore me im a noobBe sure you understand the reason for not spraying at low rpm. There is no good method for varying nitrous flow with engine speed - basic nitrous systems are either on or off. This means that if engine speed is too low you will be flowing too much nitrous and you will generate too much torque. And something will break.

skanknova
05-25-2011, 02:49 PM
Be sure you understand the reason for not spraying at low rpm. There is no good method for varying nitrous flow with engine speed - basic nitrous systems are either on or off. This means that if engine speed is too low you will be flowing too much nitrous and you will generate too much torque. And something will break.

do you think that 3500 is still to low for the 100 shot? the cars stupid fast in first with the hit, tire spin is ridiculous going into second, but like I said im only running street tires , even after a burnout and a glued track its still lighting them up going to second , and the trans is race prepped with exception of the converter, from the sounds of it the stock long block is solid for 500+ rwhp what should I worry about breaking ?
I was seriously thinking I could get away with the 125 shot if I pulled timing, the only mods are full exhaust and a lid , everything but the trans is factory stock, the engine is dealship long block with 30k on it ,

cbr600rx7
05-25-2011, 03:32 PM
I have read that about 3000 is the lowest you want to go with a plate set up. I think you would be fine around 3500 but i would still get a decent tune when you can.

Gary Z
05-25-2011, 03:34 PM
do you think that 3500 is still to low for the 100 shot?3500 is not too low. The general consensus is that you shouldn't spray below 3000 rpm. Some do get away with 2500. Going lower is risky. I wouldn't spray below 3000.

skanknova
05-25-2011, 05:42 PM
how bad would I be pusshing my luck if I hit it with a 125 shot and no tune? I would be runing 100+ octane if I do it, and im thinking about doing the iat mod so I can pull 3 degs

skanknova
05-25-2011, 05:43 PM
I have read that about 3000 is the lowest you want to go with a plate set up. I think you would be fine around 3500 but i would still get a decent tune when you can.

its a nozzle kit , does that make any difference?

Gary Z
05-25-2011, 08:27 PM
how bad would I be pusshing my luck if I hit it with a 125 shot and no tune? I would be runing 100+ octane if I do it, and im thinking about doing the iat mod so I can pull 3 degsA 125 shot with no tune is not just pushing your luck, you will be sacrificing performance. You should at least do the IAT resistor mod. I recommend doing the resistor mod and modifying your IAT table to pull at least 5 degrees. Also, you need to know where your WOT timing is. You can determine this with editing or scanning software - HPTuners does both.