DogNutz

iTrader: (6)

He ran an 11.7 full bolt-on 04 Mach 1 auto with a 175 shot and 3500 stall with 4:10's on ET Streets and Boston was running the 150 shot money maker with Lid, Open-cut-out, 6-spd 02 Ram-air with stock 3:42 and for the first time ever ET Streets. Maybe the awesome launch he got when he Launched on the Mach 1 and held it, must have hurt it on the first race and the second his motor went. That my friends WAS a 11.x basically stock Trans Am with a 150 shot! Hell he doesn't even have hedders.

98redorangeta

iTrader: (10)

Explain this to me cause to me it looks like your saying the system only opperates if its between 12.0 and 15.0 if so that could be your problem. 13.0 afr on the gas is gunna blow **** up.

bostonhatcher

iTrader: (26)

What would you suggest I do, go richer on the fuel jets? Dave said for the 150 shot it was 70 nitrous 35 fuel.

98redorangeta

iTrader: (10)

I would check the afr and make sure its around 11.8. Dont just go with a jeting make sure that its right for your car he can only give you a base line you have to double check it your self.

Beer99C5

iTrader: (21)

You have a Wide band? What were you getting for AFR when you sprayed? Most will adjust the fuel jetting to get what they desire. I believe Dave targets 11.8 for the AFR for his systems.

A502slo

iTrader: (4)

No, the jest are good. Its the fuel system you have to give the car the fuel it needs is lacking. Are you using stock injectors?? stock fuel pump??

bostonhatcher

iTrader: (26)

Yea stock injectors and stock pump. I was told you didn't need to upgrade on a 150 shot and I don't have anything else done to my car.

Robert56

iTrader: (2)

Well what were you running a/f wise, as this has never been answered? Your safety net of shut of rich 12 and lean 15 did nothing except allow your engine to blow. You should be running a sprayed a/f of 11.5 to 11.7 which is richer than your settings. Also, if you checked your a/f you could have seen a lean issue if your pump wasn't up to par. Just because we (vendors) suggest a certain jet combo to start with, it's still rec to check a/f for safety. Sorry this happened, but it seems a complete understanding of nitrous workings wasn't met. But then again, this could happen to any of us at any time for a number of reasons, on wet hits that is.
Robert

gillbot

iTrader: (27)

I don't know about that, I was told to upgrade my pump before I got to 375RWHP and DEFINATELY upgrade it for anything after 400RWHP and get new injectors also.

860 Performance

iTrader: (1)

Its common for piston chunks, and ring pcs to shoot up past the intake valve and either land in the intake manifold or even find their way down other runners inito other cyls.

383LQ4SS

iTrader: (33)

15 to 1 as your cutoff with a 150 shot is not good at all...pretty much instant death with 93 octane. Way too lean. It should have been 12.5 max...prefferably 12. Your AF should have been tuned on the spray with a wideband to approx 11.5 to 1.

I would have set the rich/lean settings from 10.5 to 12.5.

You probably should have a fuel pump. Its hard to watch the FP gauge during a run so its tough to say exactly what FP may have been at that point you had the failure.

Also...tear into the motor...its also very possible it had nothing to do with nitrous. What where you spinning the motor too?

Anyways...get her reabuilt or get other motor in there...and adress all the issues that it may have been before you spray again.

383LQ4SS

iTrader: (33)

That probably is the correct jetting but you really need to test this on a wideband or a dyno with a wideband. If there are other issues that might restrict fuel flow then it doesnt matter what the jetting was. So if there was some type of failure or blockage in the fuel side...and your ctuff was set to 15 to one...you are ripe for detonation.

Do you know what your AF ratio was with those jets prior to this happening? Did you ever dyno the nitrous kit with a wideband?

anotherreject04

iTrader: (4)

this is one of those posts i see and scares me away
was it tuned after the install?

Demon_Speeding

iTrader: (24)

I'd have to agree, the stock pump just couldn't keep up with the demand. As a rule of thumb I've always been told a 100 shot is relatively safe on stock pump. However it is best to upgrade for the 150. There are many extra careful people who have upgraded the fuel pump for any nitrous shot. I really think you went lean. My experience may be somewhat limited, but I saw almost the exact same thing happen to a buddy's LT1 a few years back.

blacktransam

iTrader: (13)

guys.. read the stock bottom end stickie at the top of this page.. if you know your LS1's that well you know gm switched between a few manufacturers for the fuel pumps during production of these cars.. and by adding any spray at all you are exceeding the demands of what the factory built your car to do..

the title of this thread should be "I assumed i had enough fuel and went lean"

you never double checked your a/f on a wide band.. i'll put 100 dollars on the line sais you never pulled a plug after a run to see what a/f was doing.. basically you bolted on an after market setup ASSUMED what you had was good enough and it wasn't..

its threads like these that give nitrous a bad name when it in fact wasn;t the nitrous fault at all..

Mike

next

iTrader: (9)

Sorry to hear you hurt your motor, but as said above, nitrous didn't blow your motor. Many of us diehard nitrous junkies have learned our lessons the hard way but blaming the nitrous is not the answer.

I agree that the fuel system probably didn't keep up and as posted you didn't set the right range for your a/f cutoff. Since you're running a wet kit your injectors don't really come into play. The real learning experience here is you need pull your plugs and read them to see if the a/f is right.

daniel6718

iTrader: (36)

also should have pulled more timing then 4 degrees, detonation will kill even a forged bottom end, and youlll only lose a few hp

bostonhatcher

iTrader: (26)

I really didn't mean to title the thread in a way that blames nitrous. I know it was my fault but the title isn't exactly what I addressed to be important. I wanted to know where I went wrong because I'll be doing it again as soon as I get my car running and also fixing the problems that were suggested on here.


I love nitrous too much to let it go.

383LQ4SS

iTrader: (33)

No problem man. Just keep reading and learning. By the time you have your new motor in...youll be a nitrous wizard and running 200+ shots without any issues

And you arent the first person to do this...many here have learned the hard way...myself included.

Outlaw Motorsports

iTrader: (4)

Nitrous doesnt blow a engine up, it is the lack of fuel that is supplied that does.