ok i will try to explain this as best as i can. i put a nos dry kit on my car. i got the window switch, start retard, and fpss, and wot. ok i hooked it all up and went out and sprayed. i just got to third gear then hammered it and it kicked in took it up to about 4900 and let off the gas. i did that a couple of times in 1st 2nd and 3rd. everything is great. ok then today i went out and decided to do it from a dead stop. window switch is set at 3100 and 5100. ok so i take off and it kicks in. it gets to about 5200 and it like it hits a rev limiter the rpm fluttered at 5200 so i shifted in to 2nd it kicked in again and got up to about 5200 and did the same thing it would go any higher. so i shut the n2o off and hmmered it and took it all the way up to 6000. so it only does it when n2o is on. i double checked the wiring even triple checked it. i called n2o tech and got a wiring diagram on how to hook everything up. even called again and talked to a different guy and got the same diagram. what could be the problom??

 

Mine did something similar. My mechanic thought I was blowing through the stock torque converter. Turns out I was a quart low on tranny fluid, replaced it and it has been fine ever since!

Hope that helps...

 

Qwik,

It sounds to me like the "flutter/power falls off" you mention might be a nitrous delivery problem.

If you know for a fact that all wiring is good to go and all grounds are good,no problems with the Hobbs switch(if you run one) I'm assuming the car runs fine when the kit is off? If thats the case and the problem happens only when the nitrous kit is engaged then do the following: Take the car out but just before you do disconnect the nitrous line and make sure you get all the psi out of the line. Next take the car out and as your driving the car arm the kit but DON'T TURN THE BOTTLE VALVE OPEN! Now as your cruising down the road activate the kit as you normally would and see if the same problem happens? If it does what is happening is the nitrous kit is dumping to much fuel into the motor without enough or possibly any nitrous. This would produce a something simalar what you mentioned, the car would fall on its face no matter what speed your going.

What I would check then is see if your nitrous bottle is either empty or how the bottle is position regarding, is the syphone tube getting nitrous? The bottle should be at a 20 degree angle or if stood straight up then make sure that the label on the bottle faces toward the back off the car because on take off the nitrous will move to the back side of the bottle if the car is leaving hard enought.

I would all so check and make sure that there is no debri in the nitrous filter(if ran) or the solenoid. You would be amazed at the teflon shaving and what not that I have seen come out of lines when I cleaned them prior to install of a new kit!

The other thing is make sure your bottle psi isn't to high. Because if the bottle was to get to hot and the nitrous psi will raise up enought to lock the nitrous solenoid from opening if your using a small solenoid.

Other than that it's hard to say with being there. But that should give ya some things to check.

Good Luck!
Jim

 

Ok i was with him when we sprayed !
the bottle presure was at 900 and the fuel gauge was at 80 psi
and every thing was going smooth the n20 kicked in all the way through 1st then as soon as it hit 5200 it acted like it hit a rev limter and the rpms kinda jumped up and down about 300 rpm
but wouldnt go over 5200 so then he shifted and we went all the way through second then when we hit 5200 it did it again so we stoped. then we turn off the n20 and made a run shifting at 6000
with no problem !!!! he aslo had the msd window switch set to turn off at 5100
he has the msd 6a ignittion and a retard thing set at 4
and yea we lost power while it hit that point but the rest of the time the power was all there

So what do you guys think now???

 

well what thor39 said pretty much covered it. it runs smooth all the way up to about 5200 and then it's like it hits a rev limiter cause the rpm bounce from 5100 to 5200. but other wise when the n2o is off it runs awsome no probloms. when the kit is activated it runs great all the way up to 5200. i will check the filter. but is there any other ideas what it could be???

 

ok i checked the n2o filter and it was just like brand new. and the bottle is angle right cause i am using the n2o brackets that came with the kit. so i checked to see how much n2o was left in the bottle by wieghing it. and there was only about 1lb of n20 left in the bottle so i am going get that filled and check to see if that was the problom. would not that much n2o in the bottle caue it to do that???

 

I don't think the FPSS will work (if you have one) with your fuel pressure at 80 psi, I though the were on good from 20-45 psi. Isn't 80 psi a little high for the fuel pressure on a LT1?

 

no 80 psi isn't high. the psi when the n2o is OFF it's around 40. it's around 80 psi when the n2o in ON.


so could that have been the problom? the bottle almost empty. well i will get it filled tomorrow and see if it took care of the problom. i will keep you guys informed. thanks

 

woohoo. ok well i went out today and with the bottle filled and it didn't do it. so i guess it was just the bottle being almost empty. it only had less than 1lb of n2o in it.

 

Glad to hear you got it fixed. But incase it does it again check the plugs. 9 times out of 10 when it does what you are describing (hitting a rev limiter) it is ignition related. If you still have the stock plugs in it try going one step colder non platnium gapped at around .035-.040.

 

i got irridium plugs in it and there gapped somewhere in that range forgot what exactly there set at but there in the range.