Hi Fellas,

After picking up the 94 three months ago from a fellow member (405rwhp NA) with a 150 shot of Nitrous with the Direct Port system Nitrous Express, I decided to at least use it for the first time in my life. I got the bottle refilled from Speed Demon and on my way back home I tried to hit it with no notice of any increased power. I tried it again and with the same result. I have a progressive controller with the settings of 50% to 100% in 2 seconds with the RPM window switch of 3400-6200 under WOT. I tried two times in the third gear to turn the switch on at around 3000 rpm and punched it but did not feel any increased power. I also tried to hit it in the second gear but with the same results. My light that tells me that the Nirous is on sems to be on while hitting it but no feelings of any increased power. I have few questions:

1) With the settings that I have on the progressive controller, would I be able to notice a 150 shot with the naturally aspirated 405rwhp and 412 rwtq? What would be a way to tell if Nitrous is hitting? Sorry I have never experienced Nitrous before.

2)On my setup, the previous owner told me that the nitrous is tuned at about 52 psi. During regular driving, my fuel gauge always shows 40psi and at WOT it jumps up to 46psi. Would that be safe to run a 150 shot if the fuel presuure is 6psi lesser than what it is supposed to be tuned at?

I did make sure that my controller's **** was pointing at "Run" before I tried to punch it in all three runs. Any help would be greatly appreciated. Thanks so much.

 

I know with mine, when 150 hits, you definitely feel it.

I tried using it in first and second and thought it wasn't working right either.

I don't think it cares what your fuel pressure is, so it should still hit.

Could it be your clutch is slipping or tires spinning?

I use it in 3rd and 4th on street tires where it is less prone to tire spin.

Sit back and smile as you feel it!

 

you will feel a 150! it should scare the **** out of you if you have never experienced nitrous before!

My guess is that you solenoids are not wired or the relay is bad.

If you have a direct port system and the nitrous solenoid is not working, you will feel the car stumble because it is shooting straight fuel into your intake. If your fuel solenoid is broken then you would have blown your motor.

Check to see if everything for the nitrous is wired and there are no blown fuses. What kind of progressive are you running? Are you running the NX maximizer?

 

Thanks Jeremy and Paul for your replies.

Jeremy,
I am not experiencing any wheel spin or clutch slipping. Altough I would love to spin the Nittos DR in the third gear with a 150 shot. The fuel pressure doesnot bother me as being responsible for the Nitous malfunction. I am more worried about running lean and hurting the motor.

Paul,
I expected the 150 shot to be very noticeabl but again with the setttings of 50% to 100% in 2 seconds I was thinking that it my not hit as a shock but rather gradual increase in acceleration which I do have enough and I thought I may be not noticing due to the lack of experience. I did not notice a stumble though and the car is running fine so hopefully both soleniods are working. Is there any way that I can tell if my solenoids are working or not if the fuses are o.k.?

My unit says "NOS Progressive Controller" on it but I can tell you more if that does not give its identity. By the way how is your steel Blue Beast running? I was waiting to see your results with your supercharger and 150 shot. That ride of yours is really cool.

Again, thanks a lot for your input guys.

 

I know this is kinda a lame idea, but is there any chance your bottle valve is closed instead of open? I did this one time while getting ready to spray for the first time and it happened to be a good thing because the secondary inline pump was fried and i had a major fuel restriction to the point that I had no power over 4k RPM. so i was glad I pulled a moron and forgot to open the bottle. just a thought for the obvious things first. also, what motor combo ar eyou running? sounds like a 383-396 CI with that torque number way up there... thanks,
Chris

 

You can check to see if the solenoids are working by doing this: turn the key on but don't start the car. Arm the nitrous switch then hit the toggle switch or whatever you do to activate the nitrous system and see if the solenoids click. You will shoot a little fuel into your intake but that's ok just make sure your bottle is not open. If you hear both solenoids click then your nitrous system works fine.

I don't think your nitrous system is working...you would still feel that power come on regardless.

I ran the car last weekend at the viper vs vette in Fontana. My car didn't pass tech so I was not able to make any sub 12 sec passes. They claimed my 5 pt harness is expired!? I didn't know I had to get the SFI approval every year.

Long story short, best pass 12.2@ 111mph without nitrous shuting down around the 1200ft.

If you want to see some cool pictures you can go to: www.prismphotos.com

Go to the gallary, scroll down to the very bottom of the page and you will vipers at fontana. On page 3 you will see my car vs a Z06. Notice the hole shot with street tires and the Z06 with CCW drag package!

 

Thanks Chris and Paul for your replies,

Chris, here is the funny story. The first two times when I hit it in the third gear, I did not feel anything major to have thought that Nitrous was hitting. I was kind of disappointed and after 10 or so miles down the road, I decided to hit it in the second. When I did that I did felt the torque and with the gauge light on, I almost thought that I was experiencing the Nitrous. That good feeling did not last long as I realised after 5 seconds that I had turned my bottle valve off after the first two runs and had forgotten to turn it on in the second gear. That cinfirmed to me that my feeling was pure psychological and it would not have hit in the first runs for sure as I thought I felt a lot better torque in the third run. . By the way Chris, what do you think about the fuel pressure issue? Should I be concerned?

Paul: Thanks for the hint. I will try first thing tomorrow night once I get back in Houston. Right now I am in Atlanta for the last week or so. That holeshot of the beast looks pretty strong. I would have imagined you may have put on 3 to 4 cars on him if you ran on your potential. By the way how did the Z06 do in the quarter? It seemed to have the drags and skinnies and I believe he would have had his equipment updated to be able to run full potential. I remember you wanted to get into 10s and I think if you can hook, that should not be a problem. Was your 60ft good enough to make you happy? Get your roll cage certified and 10s are not too far. .

 

wanderer,

my thoughts on the fuel pressure are that if the previous owner did extensive tuning on the dyno to achieve the proper A/F ratio, and it was achieved with the ECM tune you're currently running now, and fuel pressure when dynoing was at 54psi, I would use the stated 54psi when runing nitrous. the jets in the fogger system are tuned for it and of course your getting more fuel from the injectors at this fuel pressure. running it at a lower pressure could certainly cause a lean condition and possible damage.

the alternative, is to find a set of jets that achieve the proper A/F ratio at 46 PSI but this of course will require a wide band O2 sensor for accurate readings while testing. otherwise, when you know your gonna spray it, pop the hood and crank the base pressure up some and honk on it until you see the 54 psi under WOT load. then note the base pressure with vacuum line disconnected from the regulator, and you know where the AFPR needs to be set when spraying.

I am sure he added a little extra fuel as a safety margin, but i would like to see that stay intact so your motor can live and you can give us the play by play when you get the solenoid issues pegged and working!

hope it helps!

Chris

 

Thanks Chris for your valauable directions. I would try to get the pressure up before I decide to run it again. Even at the pressures that I have(40psi idle and 46psi at WOT), I tend to run quite rich when it is cold and even when I am warmed upto normal temperatures, I always hear these pops in the exhaust in changing gears or specially if I lift my foot from the pedal. That tells me that I am using more fuel than I need. However, if I crank my fuel pressure to 52psi, it would probably run richer. Is there a level that is dangerous for running rich that would hurt the motor or is it just wasting fuel? Thanks again with your patience with me. How is your turbo project coming? I remember reading about you getting in the supra that was real impressive and fall in love with the boost. The turbo setup right can be ultimate rush. Hope you work out all the details and the bugs.

Tariq.

 

excessive fueling can actually do some harm by washing down the cylinder walls and leading to premature ring/cylinder wear. most all motors will pop on deceleration if there is a camshaft with excessive overlap, or lack of catalyitic converters and the Air Injection reaction system removed.. it is just the cause and effect of residual fuel remaing in the exhaust due to lack of air when the throttle blades shut, not a true tell tale sign of a rich condition.. the only real way to measure it is with a wide band/lambda oxygen sensor during full throttle and load conditions. I prefer to work with higher fuel pressures and less injector pulse widths when tuning cars as the atomization tends to be better at higher pressures..to a point. if you are unsure, you might want to consider some tie down time on a dyno with wide band logging and see just where that rascal is at. if all is well, you can run a nitrous pass on the rollers as well to measure the A/F ration while spraying, this will let you know your dead on. much like boost, i like to see between 11.9-12.4 on the juice as a safety margin.. more then that and she'll be a pig, and less is running stronger but on the edge of detonation. also if you have a laptop, you can use a data logger and keep your eyes peeled for knock retard to make sure the tune is still perfect!

as for my project, its been two parts busy and 4 parts lazy in the heat, there have been some times i could have worked on it, but just didn't have the ambition to get on it.. my buddy Geoff, Ghall from this forum, and I are going to charlotte to plop his new built motor back in his GN, i aqm sure that will light a fire under my **** to get on the ball!! lol oh well hope this helps!!

Chris

 

As usual,

Thanks for your insight Chris. Wish you good luck with your project. By the way I had forgotten to mention earlier that my motor is a 398 with forged bottom and some day soon I will be in the market for a D1 SC or better after getting used to the Nitrous. I was never a big fan of Nitrous, however, as it came with the car, I do want to take this opportunity to use it. To me any power adder is good as long as I can use it over and over without interruption and filling the bottle seems too huge a task for me.

Thanks again, (Paul Jeremy and Chris), guys for your time and patience with me.

 

Simple and easy do not use the nitrous bottle !!
Turn on your system and hit your switch as if your nitrous was on ,
the car should fall on its face and almost flood out.
If it does not fall on its face the nitrous is not working.(fuel or nitorus)
If your using a 150 shot you will feel it no matter what speed you are going unless the bottle is under 75 degrees.
Then the car should surge and cut out,when the bottle is cold.
I run a 125 shot on a 1994 auto and break motor mounts shocks and turn 11.21 at 121.34 mph I always know when it i s on.

 

You say you had the bottle filled and tried it out on the way home.... Sounds like its a simple as the bottle pressure being to low. If mine is below 900psi you really cant feel the hit. Did they use a pump to fill it or did they freeze your bottle and fill it that way? If they freezed it then thats your problem...low bottle pressure.

 

Thanks John and Dale for your inputs,

John: I did by mistake one time tried to use my Nitrous with the bottle closed. That was the only time that I felt may be Nitrous is working but I noticed it right after that my bottle was closed. The temperature outside was in mid 90's in Houston, so I don't think my bottle could have been below 75.

Dale: I did check my bottle presure and it was above 1200 in the dangerous zone and I had to purge the Nitrous to get the pressure down to 1100 range before i tried to use it.

Thanks for your inputs though

 

Hi all,

Thanks everyone for their input. I just came back from Speed demon and Chris figured out the problem in 1 1/2 minute. While pressing the throttle, the RPM switch at the throttle body was not being depressed. Therefore, the Nitrous was not hitting because of switch not engaging. Right after, I tried the NOS 150 shot and yes I could feel it hitting.

I am looking forward to a third gear pull with a liter bike to get a feel for what would I need to do to keep up with them.

 

Glad its fixed!
The nitrous works best when used out of the hole,at higher speeds the tank pressure drops below 1000 psi and you will lose power.
A blanket to keep the nitrous hot and so it does not drop below 900 psi.
is best.
Using nitrous 150 shot out of the hole could be a disaster unless you have one strong drive train.don't it too hard.

 

Thanks for the tips John. I hope my D44 can handle this 150 shot out of the hole. I would only do a hole shot at the track to see what is the best time I can achieve with my car. So far, I have never been to the track and when I do go, I will do couple of N/A runs to feel the track before I use my shot.

 

Are you coming up to Hallsville this weekend the 9th?

 

Hey Rob,

How far is hallsville from Houston. I had not planned on coming but I may drop by if that is not too far and the car is tuned well. Thanks.

Tariq

 

It's a couple hours, there are a few guys coming up from Houston, you can caravan. We usually have about 10 to 15 vettes caravanning out of Dallas it takes us over 2 hours to get there. It's a lot of fun!

Post in the Southwest section about who is driving up and follow them.

check out http://www.xtremecorvettes.com/ .....Corvette Showdown

Robert