Nitrous Blows Up My Motor
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.
12 Second Club
iTrader: (10)
Joined: Sep 2005
Posts: 948
Likes: 0
From: From Ohio now in that state up north
Originally Posted by bostonhatcher
FJO wideband controller with lean/rich cutoff wired into nitrous controller. Cutoff is 12.0:1 and 15.0:1
12 Second Club
iTrader: (10)
Joined: Sep 2005
Posts: 948
Likes: 0
From: From Ohio now in that state up north
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.
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.
Originally Posted by bostonhatcher
What would you suggest I do, go richer on the fuel jets? Dave said for the 150 shot it was 70 nitrous 35 fuel.
Originally Posted by bostonhatcher
What would you suggest I do, go richer on the fuel jets? Dave said for the 150 shot it was 70 nitrous 35 fuel.
Robert
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Originally Posted by bostonhatcher
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.
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.
Originally Posted by slimcracka
if its in the intake then it probably took out a head and possibably a block..
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.
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.
Originally Posted by bostonhatcher
What would you suggest I do, go richer on the fuel jets? Dave said for the 150 shot it was 70 nitrous 35 fuel.
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?
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.
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
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
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.
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.
Thread Starter
Staging Lane
iTrader: (26)
Joined: Jul 2005
Posts: 89
Likes: 0
From: Northwest Missouri
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.
I love nitrous too much to let it go.
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.
And you arent the first person to do this...many here have learned the hard way...myself included.
