Ok, I was under the impression that you want to run your nitrous always when its in the green so you get full HP out of your set up. Never run it in the red, or below 300 psi. From what I understood even if its below the green in the white u can run it, but your not getting as much HP out of it as say you were in the green, is this right?

I was racing last night and a guy mentioned to me that it doesn't matter where the gauge is your always getting full HP, and that you DONT want to run it in the green or higher cuz that will blow up my bottle?????

is he right? It doesn't make sense to me, cuz then what is the uses of a bottle heater, witch makes it stay in the green? And when you read anything, red is bad, and GREEN is good...if figure the same would go with this gauge. So give me a heads up on this. Thanks!

-2nd question

MEVI give boosted maximas AWESOME gains. I asked a while back if we get these gains too with nitrous. Somebody posted that they got 60 peek horse power from it, off a 75 shot. I was telling this to one of my friends that's boosted, and he says there's no way we will see good gains due to the fact nitrous setups are not air related. That upgrading our exhaust and intake manifolds would help some but nothing dramatic....

This true also?


Well thanks for your help in advance

-Chris

 

1) What is the range of "the green" on your nitrous pressure gauge?

Most ppl tune their nitrous system to run at optimal bottle pressure - controlled by a heater. If bottle pressure is low, you'll not gain as much power, or if bottle pressure it VERY low, you'll lose power due to richness. It more difficult for bottle pressure to be too high if you have your setup tuned with a heater, but yes, if it is TOO high, there is a chance of damaging your motor.

2) I dynoed a 125 shot comparing my USIM to the VIM. I gained only ~10 peak HP, but comparing the two dynos, I gained ~60hp/60tq in the high end. Power dropped off with the USIM, but stayed constant or even rose a bit with the VIM. The numbers should have been even better because the next day, I discovered the nitrous filter was half clogged.

 

hate to steal a thread.. but calsonic what rpm ranges do u spray through i just got a dry kit and im kinda confuused on where to spray im thinking around 4500rpms-6300rpms (autoMagic)... thanx

 

My window switch is set to spray from 3400-6300 rpms (no traction whatsoever in first). I'm auto as well.

 

I have a NX kit, and the pressure gauge in the green area is 900-1000


and you only gained 10 hp from a MEVI is that enough to see a diffrence in a race or 1/4 ?

 

900-1000psi is more or less the optimal pressure when using a bottle heater.

Like I said, I gained only 10 PEAK HP, but the I saw crazy gains in the high end. The VIM hp curves starts overtaking the USIM curve at ~5000rpms. From that point, the USIM curve quickly drops whereas the VIM curve actually gains power &/or stays constant. For a better explanation, look at my dyno chart that's posted in my homepage.

I've never been to the track so I don't have any numbers in that regard, but I can definitely tell you that VIM+N20=high speed monster. =)

 

Ok i understand now. The MEVI manifold gives us mad top end....but being nitrous cars, wouldent the US manifold benifet us more due to the fact we cant spray off the line...

That way since we have to run all motor were getting the most out of it, then once 2nd hear is shifted into , spray away... ?

 

You can spray off the line. Thats another old wives tale like the one I heard a couple of years ago when I got my first Maxiamr about not using WET kits, they would backfire and blow your car up. ONLY USE DRY KITS. So I bought a wet kit, guess what they don't blow up and backfire.

The reason the nitrous manufacturers recommend you don't spray at low RPM is because in higher gears if you hit the spray at low RPM it takes a while for the RPM to build. In that time there is mega pressure building up in the cylinders with no where to go and it can have disastrous effects on your pistons.

In first gear when you hit the spray the RPM buildup is so fast you are at 4K before you can blink your eyes. I spray just as soon as the 3rd yellow comes on and have for 2 years with no ill effects. That is with a 150 shot as well, so I don't think you are going to hurt anything. The chances are probably even less in a 5 speed because the lower gearing will allow the RPM to build even faster.

Just don't hit the spray at 2k in 4th Gear or some other scenario like that.

 

I concur. It's more important to know when not to spray and why, rather than just ask what rpm people spray at. However, I spray from 3000 on up to 6300; I just wish I had slicks.

Regarding the nitrous VI issue you can look at my graphs in a Dynojet viewer to compare or look at my Excel spreadsheet.
http://forums.maxima.org/showthread.php?t=233883

NA versus nitrous: I gained 39 ft. lbs of torque @ 6000 which equals a 45 horsepower gain comparing runs WITH the variable. That's on top of the 20-30hp gain comparing the USIM to the MEVI. Overall a 50 shot will give you about 65-75hp over a stock Maxima at high rpms.

NA versus nitrous my max gain of torque was 80 ft. lbs, min gain was 37 ft lbs, and the standard deviatation was 13 ft lbs.

NA versus nitrous my max gain of horsepower was 56 hp, min gain was 44 hp, and the standard deviatation was 3 hp.

If you look at the horsepower numbers I gained almost exactly 50hp across the board with an average 48hp gain. NOS jetting seems pretty accurate to me
-hype