Safe NOS shots
Thread Starter
Intermediate
Joined: Mar 2009
Posts: 38
Likes: 0
From: Columbia City in
Safe NOS shots
I was wondering what is safe to run in my c-5 corvette?? 75HP, 100hp, or 150HP. Looking to use it very little but do not want to hurt the motor.. I'm currently running K&N intake, Lingenflter throttle body, Magnaflow exhaust, and a custom computer tune. any help would be great.. thanks
Racer
Joined: Dec 2008
Posts: 365
Likes: 0
From: Port Richey FL
I was wondering what is safe to run in my c-5 corvette?? 75HP, 100hp, or 150HP. Looking to use it very little but do not want to hurt the motor.. I'm currently running K&N intake, Lingenflter throttle body, Magnaflow exhaust, and a custom computer tune. any help would be great.. thanks
In reality, there is no safe NOS on a stock motor. Its just a matter of time.
year and mileage?
97-98 forget about it, poor cooling
Under 50K
99-2004 100
Over 50K
none
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
Not sure I would really agree with that general statement
I've run N2O for over 25 years, on cars with much inferior engines than the LS1, and the ONLY issue I've ever had after dozens of bottles with levels up to 250hp, was a burnt (badly
) exhaust valve on a C4 when I got too greedy with the poor intake design of the L98I ran the 150 jets (made 149rwhp for a total of 563) for over 5 yrs in my 98 and had absolutely no problem.
Not sure what the 97-98 cooling issue is; Mine does just fine, even with the 600hp+ now
Tech Contributor
Joined: Sep 2005
Posts: 1,731
Likes: 82
From: New Market AL
150 hp nitrous isn't all that hard on a 350+ CI v-8. As long as you don't detonate or run lean it will handle it.
Should you push the limits on stock rod bolts? That depends on if you can afford to replace the engine. Not saying your going to break anything, but if you are going to push your hardware you need to consider the consequences of a worst case failure.
Should you push the limits on stock rod bolts? That depends on if you can afford to replace the engine. Not saying your going to break anything, but if you are going to push your hardware you need to consider the consequences of a worst case failure.
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Racer
Joined: Dec 2008
Posts: 365
Likes: 0
From: Port Richey FL
Hmmmmmm
Not sure I would really agree with that general statement
I've run N2O for over 25 years, on cars with much inferior engines than the LS1, and the ONLY issue I've ever had after dozens of bottles with levels up to 250hp, was a burnt (badly) exhaust valve on a C4 when I got too greedy with the poor intake design of the L98
I ran the 150 jets (made 149rwhp for a total of 563) for over 5 yrs in my 98 and had absolutely no problem.
Not sure what the 97-98 cooling issue is; Mine does just fine, even with the 600hp+ now
Not sure I would really agree with that general statement
I've run N2O for over 25 years, on cars with much inferior engines than the LS1, and the ONLY issue I've ever had after dozens of bottles with levels up to 250hp, was a burnt (badly
) exhaust valve on a C4 when I got too greedy with the poor intake design of the L98I ran the 150 jets (made 149rwhp for a total of 563) for over 5 yrs in my 98 and had absolutely no problem.
Not sure what the 97-98 cooling issue is; Mine does just fine, even with the 600hp+ now
Just so I am clear here, you take no account that normal engine expansion is close to 15-17 percent on the aluminum LSx, and running a 100-150 shot on stock ring clearances wont cause a problem? There is no worry of the additional heat and stress the nitrous puts on the engine? Added heat and wear won't rapidly decrease the life expectancy of the engine? add in the current mileage and how it was maintained and there could be problems?
If the 97-98 motors were so good and cooled properly, why did GM bother making the LS6 standard in all vettes after 99? How many 97-98 motors have busted a ringland or shattered a piston?
I think it has been well documented here on this forum and other places that the 97-98 have cooling issues.
now I'm not saying anyone is wrong, just giving safe and cautious advice to a new member. The both of you are examples where nitrous has worked well and I applaud you.
Trust me I have a 98 vert and I know all the pros and cons of the year car and was not insulting anyone.
Its not easy and very expensive and time consuming to replace a motor.
Best of luck to the OP, you have good info on either side of the issue to help you make an informed decision which ever way you decide to go.
Instructor
Joined: Dec 2005
Posts: 118
Likes: 0
From: Kansas
Just so I am clear here, you take no account that normal engine expansion is close to 15-17 percent on the aluminum LSx, and running a 100-150 shot on stock ring clearances wont cause a problem? There is no worry of the additional heat and stress the nitrous puts on the engine? Added heat and wear won't rapidly decrease the life expectancy of the engine? add in the current mileage and how it was maintained and there could be problems?
If the 97-98 motors were so good and cooled properly, why did GM bother making the LS6 standard in all vettes after 99? How many 97-98 motors have busted a ringland or shattered a piston?
I think it has been well documented here on this forum and other places that the 97-98 have cooling issues.
now I'm not saying anyone is wrong, just giving safe and cautious advice to a new member. The both of you are examples where nitrous has worked well and I applaud you.
Trust me I have a 98 vert and I know all the pros and cons of the year car and was not insulting anyone.
Its not easy and very expensive and time consuming to replace a motor.
Best of luck to the OP, you have good info on either side of the issue to help you make an informed decision which ever way you decide to go.
If the 97-98 motors were so good and cooled properly, why did GM bother making the LS6 standard in all vettes after 99? How many 97-98 motors have busted a ringland or shattered a piston?
I think it has been well documented here on this forum and other places that the 97-98 have cooling issues.
now I'm not saying anyone is wrong, just giving safe and cautious advice to a new member. The both of you are examples where nitrous has worked well and I applaud you.
Trust me I have a 98 vert and I know all the pros and cons of the year car and was not insulting anyone.
Its not easy and very expensive and time consuming to replace a motor.
Best of luck to the OP, you have good info on either side of the issue to help you make an informed decision which ever way you decide to go.
Racer
Joined: Jun 2007
Posts: 266
Likes: 1
From: Mobile Al
I'm running a 100 wet shot in 04 LS1. On the dyno it was running lean 12.8 with the kit makers recomended jets sizes so I went up one size on the fuel pill (jet). The timing was good at 0º with no detination. I retarded it 2º and made another pull and it actually lost HP and still had no detination so I put it back to 0º. There was one hic-cup at 5200 rpm that was constant on all 4 NOS pulls.... not a big deal. I'm going to dyno it again next week with the larger fuel pill in it and I'll let you know what happens. My goal is to get the Fuel / Air ratio to 11.8 - 12.2 just to be safe.
