adding N/O to a 15.33 to1 engine

[andybyrd]

can I put a 150 shot of N/O to my 434 @ 15 to 1 -660 h/p with out damaging it and what kind of life will it take out of its life cycle in other words how much longer would just running gas last vs running N/O. I just want to go from 6.10 to 5.80 in the 1/8 without tearing up my motor
Thanks Andy

[hammertime]

150hp is pretty safe , but make sure you have the timing retarded 6 degrees and adjust the fuel accordingly.

[TheRabbit]

150hp is pretty safe , but make sure you have the timing retarded 6 degrees and adjust the fuel accordingly.
Also remember that a 150shot isn't much added horse power. Don't forget you loose about 10hp per degree of timmig you take out to run the NOS.

[andybyrd]

Ok, so I take 60 hp out of a 660 hp motor makes 600 then add 150 would make it now 750 w n/o so it will be like adding 90 h/p, I just wanted to make sure It did'nt blow the rings out. I've been told that for every 100 hp of n/o is raising your compression up 1 point. like mine now is 15.33 to 1 then with the 150 shot of n/o it would be 17 to 1 is this true.
Thanks Andy

[hammertime]

150hp is pretty safe , but make sure you have the timing retarded 6 degrees and adjust the fuel accordingly.
Also remember that a 150shot isn't much added horse power. Don't forget you loose about 10hp per degree of timmig you take out to run the NOS.

I've never seen the 10hp per degree on mine, I think this is dependent on the combo and all my vary. My 150hp picks up .15 for 2 seconds but I pull 6 degrees and am wayyy safe on fuel pressure with a seperate system. Also normally the faster you hit it the faster it'll be

[russ67chevelle]

i dont believe that 10 degree stuff earlier posted...

[TheRabbit]

Sorry guys if you don't believe it. Ask your engine builder.

[hammertime]

Sorry guys if you don't believe it. Ask your engine builder.

I've actually done better, changed the timing on the dyno 1degree isnt 10hp ;) maybe 3-4 degrees but again every motor is different 10hp is a stretch

[fastguy1]

i sprayed my 588 with a 500 shot speed tech fogger and picked up 350 hp worth of et. 5.17 on motor, 4.55 on spray at 2300lbs

[gimmemud]

There is a lot of "not so trues" in this post.

(1) 150hp as far as what is recomended as a baseline tuneup for the nitrous manufacturer will not net the same horsepower gain from one engine to the next, so a 150 shot on a 10.5-1 350ci will not net as much horsepower as a 150 shot on a 15.5-1 632, both tuned accordingly. There is not one nitrous system manufacturer out there who can recomend a tuneup that will be perfect out of the box. The only way to give a nitrous engine what it wants or needs is the ability to read spark plugs and make the proper adjustments to get the mixture right (nitrous fuel ratio) and ignited at the proper time (heat mark on ground strap of spark plug)

(2) Retarding the timing does not reduce the horsepower by 10hp per degree, at least not while the nitrous is in use. Retarding the timing allows the mixture to ignite at the proper time so that it doesnt detonate or pre ignite, which causes serious harm to an engine.

(3) Just to say to pull 6 degrees of timing for a 150 shot is wrong also, one needs to know what the initial timing on the particular engine being tuned is first, then there is the question of what the valve angle is on the heads, type of fuel being used, compression ratio, cam info....etc.
A properly tuned nitrous engine will leave a clean plug with the timing mark just around the bend on the ground strap of the plug.

In my particular engine when I go down the track with both foggers blazing, my timing is pulled down to 8 degrees. :shock:


Not trying to step on anyones toes here, just wanting to share some of the things that really matter when tuning a nitrous engine.

[demented]

In my particular engine when I go down the track with both foggers blazing, my timing is pulled down to 8 degrees. :shock:


Not trying to step on anyones toes here, just wanting to share some of the things that really matter when tuning a nitrous engine.

Thanks Randy!!!
If I keep following your posts from each forum, I'll eventually get to know all your secrets!!! :wink:
What ever it takes to win..... Right? :D

[gimmemud]

Hey, thats cheatin.......aint it. :D

Have you ran the new car anymore?

[demented]

Actually yeah, I ran it last weekend for a TV shoot for a national sindication. Made a good amount fo passes with the new car. Call me when you get a second and I'll fill you in. It will be awesome for the MRA!!!! :D

Going out this weekend to get some more seat time under my belt with the new car. Trying to get the suspension tweeked to get the most out of it before I start putting the second stage to it.

[gimmemud]

Mike told me all about it, cant wait to see the show. Glad to hear you are getting it worked out.

[TheRabbit]

Actually yeah, I ran it last weekend for a TV shoot for a national sindication. Made a good amount fo passes with the new car. Call me when you get a second and I'll fill you in. It will be awesome for the MRA!!!! :D

Going out this weekend to get some more seat time under my belt with the new car. Trying to get the suspension tweeked to get the most out of it before I start putting the second stage to it.

You better steal all Randy's secrets you can and get all the seat time you can before next season.
Just wait till you get a piece of Rabbit II! :evil: :evil: :evil: :evil: :twisted:
I'm not playing anymore!! :wink:

[bjuice]

i think if you ever compared a dyno sheet of an engine before and after a Nos Hit..you will see the TQ curve is much more nasty then the increase in HP........so IMO you really can't back into your ET vs Hp gain theory on NOS...your cam grind,converter and gear ratio will play a much bigger factor in how your Car will pick up on a 150 shot more then anything....s..

Just to Give you an example...My car is 100% Set of for NOS ( Converter,gear,cam grind)

1/8TH Mile et's and Mph

On Motor- 5.84et @ 124 mph

with a 250 shot- 4.89@144 mph

see what i am speaking of...much better results then a 250hp increase advertised Nos HP pill huh ?..not the big of a shot just the way the car is Set up.

Now the Funny thing is that its only 2 tenths faster with a second stage for a total of 550 hp shot...... :P

[TS1955]

Bjuice...that's a good 1/8th mile mph for that ET. What kind of gearing do you have?

TS1955

[bjuice]

Bjuice...that's a good 1/8th mile mph for that ET. What kind of gearing do you have?

TS1955

3.70 gear. Tony Christian was the man that set up the running gear etc...he actually wanted to go with a 3.60 .... :roll:

After the gear and converter was installed The car was taken to Bradenton Florida in which the track was rented and Tony actually drove and tuned the car an entire weekend....

If you Know anything about Tony you Know he likes to drive them out the back door pretty hard.... 8)

the best 60Ft the car has had is 1.10..This is with 10 inch tires and 3060lbs...

here are a few Pics of Tony testing the car and a pic of His Automatic pro-mod running out the back door..

ahh heck i went ahead and thru in a few extra Pics....Mike swords owned the car before me and won two 10.5 outlaw races with the car right after Tony set the car up..this was one of the first 10.5 cars with this high of a gear..and would out Mph most of the 632ci Nos cars in the field by 3 to 4 MPH...Now today more people have caught On.....but make no bones about it you gotta have a strong Bullet for this gear and the Tight converter we run....60 ft on Motor is like a 1.38.......and goes to a 1.10 on Nos

ya think it responds to the spray ?


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[DirkaDirka]

Not trying to hijack but Bjuice how much horsepower does that hting have?? Also what is the tire size?? I am trying to figure out how big I will be needing to go on my Stang.

[bjuice]

1300hp on Motor then whatever the Nos adds......tire sire is 10.5x33

[DirkaDirka]

Ok. I am gonna try to get 32x14 under the wheel wells. The motor is going to be a 460 bored with a 6-71 blower. I dont know how much the car will weigh but it will be gutted.

[bjuice]

i can fit a 33x16 under the car...the 10.5 is on it for the type of class the car runs

[DirkaDirka]

Well it has 29.5x11.5.15 on it right now and they had a 351 in it. Thats why I was wondering cuz I am thinking I will have to put bigger so I can keep traction.