Nitrous install - part 2
Thread Starter
Team Owner
Joined: Jul 2001
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From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Safety Car
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From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
Properly tuned your motor would handle a 300 hit no problem. Not until you get past 350 do things really start getting critical, and even then guys shoot 400 at well built small blocks all the time. It is not terribly difficult to shoot 500 hp at 540+ in. motors as long as you build them with heavy nitrous in mind. I know a PSCA racer shooting 300 off the brake, 400 more in .5 sec and then another 300 shortly after that (for a total of 1000 hp) in a 605 BBC with AFR 357 heads. At 3200 lbs it runs 7.70's on a small tire. At that level you burn stuff up pretty often. One of the problems with very heavy nitrous shots like that is the nitrous burns so hot and quick it anneals (softens) the aluminum pistons and they will fail if you do not swap them out often. One of the big name Pro-mod guys I know swaps his pistons out every 25 runs.
Burning Brakes
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From: Granbury, TX
Thread Starter
Team Owner
Joined: Jul 2001
Posts: 182,997
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From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
Properly tuned your motor would handle a 300 hit no problem. Not until you get past 350 do things really start getting critical, and even then guys shoot 400 at well built small blocks all the time. It is not terribly difficult to shoot 500 hp at 540+ in. motors as long as you build them with heavy nitrous in mind. I know a PSCA racer shooting 300 off the brake, 400 more in .5 sec and then another 300 shortly after that (for a total of 1000 hp) in a 605 BBC with AFR 357 heads. At 3200 lbs it runs 7.70's on a small tire. At that level you burn stuff up pretty often. One of the problems with very heavy nitrous shots like that is the nitrous burns so hot and quick it anneals (softens) the aluminum pistons and they will fail if you do not swap them out often. One of the big name Pro-mod guys I know swaps his pistons out every 25 runs.
Safety Car
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From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
Don't forget that my block is a STANDARD 4-bolt 400 block!! (no splayed caps). Those blocks aren't all that strong.. I think that I need a race block for anything more than 100 HP shot.. The 100 shot puts me at about 750 HP and that's a lot for a standard 4-bolt block..
Thread Starter
Team Owner
Joined: Jul 2001
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
That's a big difference.. 4-bolt 400 blocks are known to be weak.. The 2-bolt 400 blocks are a lot stronger.... (contrary to the 350 where the 4-bolt blocks are stronger)
Le Mans Master
Joined: Jan 2006
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From: Butler Pa
If it's a 511 casting, I'd be a little scared. I've broken one before with a lot less hp than you have.
Safety Car
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From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
Hmm, ok, I guess you learn something everyday. When you build your next one I am sure you will build it with a good block, and then we will set it up to handle a lot of nitrous reliably.
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Thread Starter
Team Owner
Joined: Jul 2001
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From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
The next block will either be a Dart little M or similar...
Last edited by GrandSportC3; Jan 4, 2007 at 09:58 AM.
Drifting
Joined: Dec 2001
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From: Dallas Texas
69 NOX Ratt ..I,ve been following this thread and would really like to get educated on NOS. Where can I find material on reading the plugs while using nitrous ? If not could you do a write up on this I,ll bet alot of the forum members would find this useful 
Safety Car
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From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
http://www.gofastzone.com/index.php?topic=2884.0
http://www.yellowbullet.com/forum/showthread.php?t=7255
Gofastzone and Yellow bullet are two of my favorite nitrous sites. The article from gofastzone is a very good beginner’s article. The only thing I do not agree with is their recommendation that you use two fuel pumps regardless of engine and nitrous combination. If you have one big pump it will more than feed any motor and nitrous system. I have a Magna-flow 275 and it feeds my 454 with a 300 shot just fine. It also more than compensates for the 2.5 g's my car produces in the first 60'
The guy who posted the article on how to read nitrous plugs on yellow bullet is a VERY knowledgeable nitrous tuner. He has helped me a lot through the years. He is one of the guys who taught me how to read a nitrous plug and I use his method verbatim. In the first part of the article he talks about the plugs coming from a motor with a .040 and a .042 pill. He is referring to the jet size. A .040 jet is approx 400 hp and the .042 is around 450. He ran this in a small block. If you want to get scared check out this post.
http://www.yellowbullet.com/forum/showthread.php?t=3151
Drifting
Joined: Sep 2003
Posts: 1,325
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From: FRANKLIN GA
http://www.yellowbullet.com/forum/showthread.php?t=3151
WOW !!! Great link! Those were some serious meltdowns
WOW !!! Great link! Those were some serious meltdowns
Team Owner
Joined: Jul 1999
Posts: 65,492
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From: Orange Park Florida
Gene I ran nitrous for years, even used a two stage system in the end. I still have it on a 355 mustang. I have also installed it on alot of young guys cars and I have yet to hear of anyone blowing or burning a piston because of it. I always jet conservative for the guys and keep the extra jets so they can not play.
I saw a slow 16 second mustang drop to 13.9's with just the install of a 100 horse system.
I saw a slow 16 second mustang drop to 13.9's with just the install of a 100 horse system.
