Jimbo2828

well maybe not 203 but 202.something

jgscott

iTrader: (1)

TT The Aeromotive Adjustable FPR you asked me about is the same one the SC300 guys use. Maybe one of them can tell you ( I threw away the box ). Someone installed for me at a race machine shop and it took some customizing to get it in with fittings to clear the hood down.

Bottle pressure is your problem. but carefull with too many changes in fuel/air because you may need that fuel when spraying when you up the bottle pressure. I would make one change at a time. Intake and Exhaust mods will help alot when spraying.

Also check where you have your Nitrous Nozzel installed in the intake runner to see if it is in the best place to atomize.

Are those NGK Plus 2 steps colder ? If not thats one change you really need to make spraying a 150 shot.

PHLSingle

No way 600psi is a 100% full bottle, unless it was below zero in your dyno room.

jgscott is right about making changes, and your rich condition.

Figure, the jet sizes listed for a 150 shot take into account bottle pressure of ~1000-1050psi. If you're trying to spray at only 600psi pressure, you simply are not spraying enough nitrous to keep a good a/f with the amount of fuel supplied (enough for a true 150shot).

Bean

iTrader: (1)

You running a wet kit or a dry kit?

The fuel pump isnt the problem, DSM boys have that problem because they have a crappy FPR... our stock one works fine (enough to handle 30psi of extra fuel pressure when running turbocharged applications)... the V8 FPR is the same as the I6.

I'd bet its the bottle pressure AND that its a NX kit. The higher-end kits designate a "shot" to be of the rwhp variety... a 150 shot gives you 150whp.

I hope to god you arent running a dry shot.

PHLSingle

What exactly would a higher end kit be? You realize how many drag cars use nitrous express...granted i'm bias...but the NX brand has nothing to do with it.

Start with the obvious...the bottle only had 600psi in it!!!!!!!!!!

Figure, for a 150 single fogger shot, you're running...what, .057 or .058 nitrous jet and .033 fuel? That fuel jet is based on ~1000psi bottle pressure. 600psi, in theory, would only require a .029 fuel jet, since much less nitrous is actually flowing.

As others have said, a FP gauge would help out as well too. The recommended jet sizes from manufacturers on a wet kit are based on ~45psi FP static. If you're seeing alot more than that - you'd have to adjust the fuel jet accordingly.

Jay - long time NX user

AME_VIP

iTrader: (2)

Its an NX wet kit. Both the fuel and nitrous spray into the intake.
I need a damn warmer ha.
NX jets are 62 N and 32 for fuel.

I have a B&M fuel pressure gauge mounted and it shows 44psi at idle.

The NGK plugs are colder than stock. I can't remember if they are one step or two steps. NGK 6097.

I'm still consfused as to why when I'm running without the nitrous I run very rich. On one run it ranged from 10.6:1 to 11.1:1 at best. NO NITROUS. Is it supposed to be this rich?

Thanks for all the replies. I would really like to be closer to 202 like Jim.

I will be purchasing a: bottle warmer, SAFCII and a few hours dyno tuning. I'll post an update when I can get to the dyno.

PHLSingle

Hmmm...you sure about those jet sizes? They seem waaay off! The nitrous jet too big / fuel is too small...on a single fogger setup a 62 Nitrous jet will flow enough for ~175 assuming 1000psi in the bottle.

I can't speak much to your rich condition OFF nitrous...however, if it's anything like the gte motor...the stock ecu likes to run rich...real rich. Yes, the afc will pick up some solid hp

jgscott

iTrader: (1)

OK

1. NX wet kit has measure of fuel jet independant o f Nitrious jet. The fuel jet is suppling fuel to match a 150 shot nitrious jet weather or not the nitrous is sprying more or less. Get it ?

2. FYI on SC400 with 255 high flow fuel pump and Aeromotive Adjustable FPR is a 10 hp incease with nothing else done. The stock reg can not adjust correcty with increase fuel pump.

3. I would leave that SAFCII alone until you get a Bottle warmer to correct bottle preasure. Way too many dangerous changes at one time. BTW NX bottle warmer is Dangerous in my opinion. Get Zex or NOS warmer.

4. To get to 202 you need Intake and exhaust changes. True dual with X and BFI.

5. BE CAREFULL with fuel changes. Its starting to get cold now. You want to stay a little rich on Nitrous.

jgscott

iTrader: (1)

I have been running a 100 shot Dry Zex kit just fine for 2 months now.

jgscott

iTrader: (1)

I have been running a 100 shot Dry Zex kit just fine for 2 months now.
https://www.clublexus.com/forums/sho...d.php?t=159485

95 Integra

Fix your crappy A/F ratio. 11:1 for a NA setup is way too rich. Bring that back down to a "normal" range of 13:1 or so and you'll probably pick up 20-25whp. Ofcourse on the bottle you want it around 11:1, but not straight NA.

AME_VIP

iTrader: (2)

Thanks for the replies.

The simplicity of the zex warmer is great so thats what I am looking for. I will also look into the FPR. SAFCII will be last.

Sounds like a need a nice exhaust too.

Dyno tuning will be last.

The jet sizes were directly from NX for a 92 SC400 4.0L V8. I assume they are correct.

jgscott

iTrader: (1)

Well did you ever straighten it out and Dyno again ?