I just got my nitrous tune done last weekend and all-in-all it didnt go too bad.

the car made 415whp/418wtq off the bottle (cam/ported heads/boltons)

my nitrous set up is as follows:



NOS Cheater Wet Plate Kit

10lb bottle

NX bottle heater -- 950-1050psi

6an line from bottle to purge solenoid

purge solenoid directly connected to nitrous solenoid

4an line from nitrous solenoid to plate

4an line from fuel rail fitting to fuel solenoid

4an line from fuel solenoid to plate

NOS WOT switch

MSD Window Switch

Racetronix Fuel Pump and wiring upgrade.


We did these pulls on bosch platinum plugs because my BR7EF's didnt come in time, but i have since switched them out.


i wanted to do a 150 shot, but during the dyno pull for the 150shot, the car went horribly lean and made a pretty loud pop

so, we lowered it down to a 100shot and the car seemed to take it very well and maintained a good a/f ratio making 458whp/500wtq.

bottle pressure on both runs was between 950-1000psi.


My two questions are:

1. What could have caused the very lean condition on the 150 shot?
2. Why does it seem like my gains were so minimal on the 100 shot?

Thanks guys, as always any guidance is much appreciated.

Videos to come soon if i can get them off of my iphone.

 

heres the 100 shot pull video:

http://www.youtube.com/watch?v=NTvDC...2&feature=plcp



and heres the 150:

http://www.youtube.com/watch?v=WLeR9...1&feature=plcp



sorry that the picture is sideways, not really sure what happened there..

 

Wow those are really shitty numbers from a 100 shot sorry to say. Are you sure you had the right jets in it? You only picked up like 43rwhp are you sure you weren't spraying a 50 shot. I picked up almost 130whp from my 100 shot and almost 160wtq. When my car was full bolt ons in made 317whp/339wtq N/A 440whp/500wtq 100 shot. Maybe you have a bad nitrous fill. What was the afr? did ya happen to observe the plugs? What were they gapped at?

 

What kind/size solenoids? Jetting? Timing? Fuel psi? Are you saying your feed line runs through the purge solenoid then into the main feed solenoid? And those platinums aren't helping, should have swapped them before trying to spray it.

 

100 shot flywheel rated and soft tune due to wrong plugs??

 

Platinum plugs and nitrous do not mix. Tried to use a spare AC delco platinum in 2004 because we broke a plug and it was all I had. Ended up melting the Forged Diamond Piston and the block sleeve. The tips of the Platinum plugs get extremely hot when on the spray. You might want to do a compression test on the motor.

 

Back fired rich is my bet.
It will show lean on the 02 sensor.

Bet its real rich on the 100 shot also thats why its a terd.

 

yeah, definitely the correct jets for the 100 shot. 51N and 31F jets.

The plugs that were in the car were bosch platinums gapped at .055-.060. (which seems very high, but thats how the previous owner had them installed with the cam/boltons setup)... I've since put BR7EF plugs in and gapped to .035. The afr during the pull on the 100 shot im not sure of, but the tuner said it was in the good range.

I'm using brand new solenoids from the NOS LS1 Plate kit (cheater and power shot)

My feed line comes from the bottle and goes to the purge solenoid which is directly mounted to the nitrous solenoid.

Would it be possible that the plug gap was way to large and on the 150 shot i had blow out?

 

Been a while since I played with a wet kit but 51n 31f sounds rich.
Factory jetting is always rich and some are really rich.

Not likely to blow spark out with 150 shot.

 

Did u replace ur fuel pump. We had a car on the synopsis that the fuel.pump could not keep up. Check ur fuel pressure

 

the car has the racetronix pump with wiring upgrade

 

For comparison purposes:

Last dyno 353rwhp on a 99 T/A M-6 LS1, with stock heads & cam, Crane: gold roller rockers, push rods, dual valve springs, whisper airlid, K&N filter, Weiand LS6 intake, ported-polished throttle body, stock MAF, mid length headers, Mac cat back exhaust, 32lb racetronix injectors, EGR/AIR delete, ZEX nitrous plugs and Spec 2+ clutch with billet flywheel. Tuned with HPTuners.

Also Zex Nitrous LS1 system (125hp wet shot; .054 Nitrous and .034 Fuel jets) resulted in 455 rwhp. FYI: their dry shot recommends .046 Nitrous and .040 fuel jets.

Still have stock fuel pump installed. Full time fuel gauge installed to monitor flow. Constant 60psi @ idle and normal driving, 56psi at WOT.

Had a backfire event last year. Actually stretched the ARP intake bolts to where the intake was loose enough to cause an iair leak. Troubleshot system and found intermittent fuel solenoid was cause.