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carreracat257
11-19-2002, 10:32 PM
Nitrous setup on 300pro as anybody done one before.Any do's or dont,s.

syke-o
11-19-2002, 11:18 PM
dont know anyone....

DamageInc
11-20-2002, 06:57 AM
Wayne Taylor of Taylor Marine has done a lot of work with the 300's. I know he has installed nitrous systems on them, but am not sure what size systems or what kind of performance he is getting. Give him a call, he'll be happy to talk with you.

kab
11-20-2002, 07:57 AM
I'd be very careful installing nitrous on a motor that is meant to turn between 6200-6500 rpm's, with nitrous they turn up to 11,000 and better. You better have the right internal components. I'm thinking of installing it on my drag motors, should be interesting. Mach 22 deco-lite layup with drag motors running on nitrous.

TOBTEK
11-20-2002, 10:19 AM
kab:
I'd be very careful installing nitrous on a motor that is meant to turn between 6200-6500 rpm's, with nitrous they turn up to 11,000 and better. You better have the right internal components. I'm thinking of installing it on my drag motors, should be interesting. Mach 22 deco-lite layup with drag motors running on nitrous.Whats that word im looking for?????? physo! ya thats it! you can already do apx 120 MPH how much faster do you NEED to go? plus if you dont DO IT you can donate to the TOBTEK TRAILER RELEAF FUND! :D

Blown 472
11-20-2002, 10:19 AM
carreracat257:
Nitrous setup on 300pro as anybody done one before.Any do's or dont,s.Go over to havasu barney and talk to uncle tony, he has one bad ass n20 outboard and knows his shit.

kab
11-20-2002, 10:38 AM
Tobtek, I gave to that fund already :D I hooked you up with an address to register that new boat to and save a ton in taxes. I didn't say I would use the nitrous, would just like to have it for that once a month blast.

mbrown2
11-20-2002, 02:31 PM
kab:
I'd be very careful installing nitrous on a motor that is meant to turn between 6200-6500 rpm's, with nitrous they turn up to 11,000 and better. You better have the right internal components. I'm thinking of installing it on my drag motors, should be interesting. Mach 22 deco-lite layup with drag motors running on nitrous.Kab, one word....Sick
What do you think...130-135?...You gonna have to go over to S&F and start bench racing those STV's, Allison, and Mirages...

MikeC
11-20-2002, 08:13 PM
Ummm Uncle Tony (Barony) told me he new nothing of NOS!? Say's he never inhaled..........
UT, I won't run my NOS when we meet if you don't.
Later
FlatOutPlaced
(RealJetBoater)

Skaterfast
11-20-2002, 11:22 PM
Hope you have a fat bank roll.Don't do it.

DamageInc
11-21-2002, 07:03 AM
Hey kab -
I've got a friend that has that same set-up (with nitrous). It makes for one helluva ride! The acceleration is incredible. eek!

You Te
11-21-2002, 07:17 AM
Mike C,
Na,go ahead,run your NOS, it's ok.
You Te

snappertapper
11-21-2002, 08:34 AM
Id say go for it but i would also expect to make some more repairs simply because like kab said it will be turning at least 10-11000 rpms but they are only designed for 6-7000.

STV_Keith
11-21-2002, 09:48 AM
MikeC, Barney and Uncle Tony are two different guys. :) I don't think Barney has played with nitrous, but UT has.
Also, nitrous is used to help acceleration, not to increase top RPM. If the motor is designed to turn to 6700rpm, you would use the nitrous up to that point, not beyond it.

78Eliminator
11-21-2002, 11:09 AM
STV_Keith:
MikeC, Barney and Uncle Tony are two different guys. :) I don't think Barney has played with nitrous, but UT has.
Also, nitrous is used to help acceleration, not to increase top RPM. If the motor is designed to turn to 6700rpm, you would use the nitrous up to that point, not beyond it.I disagree. In a jet boat, where your engine is working against a pump, it might be working as hard as it can to spin at 5700 RPMs (which is my case). A shot of nitrous during WOT might bring you into the 6000 range safely and inexpensivly.

DamageInc
11-21-2002, 01:50 PM
I agree. You will definately get an increase in RPM with the nitrous. The way to control RPM in this situation is to use a larger pitch prop. Hitting the nitrous out of the hole would allow for great acceleration, then just let the boat run on the top end. Of course if they are starting to catch up, you could always punch the button again!! The key is not to hold it down for too long...things tend to go boom!

You Te
11-21-2002, 04:10 PM
About Nitrous,
The use of a rev. limiter is not a good idea with nitrous. With nitrous you will gain RPM and lower ET's. It's a win win.
If you have a limiter and you use a larger prop to keep the RPM dowm you may gain ET and you may not, it depends on how much nitrous and how big of a prop, but you will gain top end even with a limiter, and the larger prop, don't hit the limiter on nitrous.
This is a win win, no limiter and at least a 150 shot of nitrous, now this is with a 2.5 motor.
The tests we have run show about 1000 RPM gain and about 10 miles and hour.
You Te

STV_Keith
11-21-2002, 04:19 PM
But you are talking about staying in the useable RPM range...not running a motor designed to turn 6700 up to 10000.
If the thing was prop'd for 5900 and you use the nitrous to get to 6700, that's one thing...not go to 6700, then use N2O to get to 7500 or something.

78Eliminator
11-21-2002, 04:29 PM
STV_Keith:
But you are talking about staying in the useable RPM range...not running a motor designed to turn 6700 up to 10000.
If the thing was prop'd for 5900 and you use the nitrous to get to 6700, that's one thing...not go to 6700, then use N2O to get to 7500 or something.Oh, ok. That said I completely agree..... With a jet, you would actually run into problems if the bottle took you up to an RPM level where an alluminum impeller was dangerous. And with an outboard, you could overspin a prop and loose efficiency. You guys ever see the Ski Centurion Barefoot Warrior? It was my first boat. That had a 200 Merc and was bad to the bone and could turn so tight you could throw people from the boat!

Hotcrusader76
11-21-2002, 04:52 PM
78Eliminator:
STV_Keith:
But you are talking about staying in the useable RPM range...not running a motor designed to turn 6700 up to 10000.
If the thing was prop'd for 5900 and you use the nitrous to get to 6700, that's one thing...not go to 6700, then use N2O to get to 7500 or something.Oh, ok. That said I completely agree..... With a jet, you would actually run into problems if the bottle took you up to an RPM level where an alluminum impeller was dangerous. And with an outboard, you could overspin a prop and loose efficiency. You guys ever see the Ski Centurion Barefoot Warrior? It was my first boat. That had a 200 Merc and was bad to the bone and could turn so tight you could throw people from the boat!J???? Why in the hell are you hanging out over here? Outboards? Are ya coming out of the closet? http://www.plauder-smilies.de/rotfl.gif

78Eliminator
11-21-2002, 04:54 PM
Hotcrusader76:
J???? Why in the hell are you hanging out over here? Outboards? Are ya coming out of the closet? http://www.plauder-smilies.de/rotfl.gifI like ALL boats! wink Howyabeen?

Hotcrusader76
11-21-2002, 04:55 PM
78Eliminator:
Hotcrusader76:
J???? Why in the hell are you hanging out over here? Outboards? Are ya coming out of the closet? http://www.plauder-smilies.de/rotfl.gifI like ALL boats! wink Howyabeen?Just chillin ole'friend...
Are ya heading up to DD's Xmas party?

78Eliminator
11-21-2002, 05:06 PM
Hotcrusader76:
Are ya heading up to DD's Xmas party?I would like to. If it happens it will be a last minute thing....

Boatmaster
11-21-2002, 05:18 PM
Do Not put nitrous on a 300 Pro Max. That thing will not hold up to the higher RPMs without nitrous, let alone with it. The oil injection has trouble keeping up after anything higher than 6500, at least on the older 300s. 2.5 Mercs have trouble even when you Know what your doing, and they love RPMs. Just my .02 but it's not worth it on a 3.0 liter.

You Te
11-21-2002, 07:05 PM
If blowing up the motor is going to break the bank,then don't use the bottle.
I have friends that turn V8 OMC's well over 9000 RPM.
Do I think 7000 RPM is to much for a Merc 3 liter, no.
Will nitrous make the motor live longer, no.
Just because you have nitrous and can turn 7000 RPM, that does not mean you use it every time you go out or you hammer the throttle all the way across the lake on the button.
That would be asking for trouble.
I've seen oil injection work on 225 Pro Max's
at 6900 RPM.
I don't know about a 300 Pro Max, I don't like oil injection myself so I would remove it if I were doing nitrous on a 300 Pro Max.
In closing all I can say is, if you do your own wrenching and have the funds available to buy parts, then nitrous is a blast, if not,then put gas and oil in the boat and forget about the juice.
You Te

Tom Brown
11-21-2002, 07:32 PM
You guys are glamorizing the use of nitrous oxide injection without making mention the biggest draw back of all. That is, the tendency of those who use it to become infatuated with obese women.

You Te
11-21-2002, 08:34 PM
Oh now Tom,
Don't be talking about my engine turner that way.
You Te

Jrocket
11-21-2002, 08:43 PM
You Te:
Oh now Tom,
Don't be talking about my engine turner that way.
You TeI know he didnt just call me obese!!!!!.Dont make me drive up to the North.... :D

carreracat257
11-21-2002, 09:40 PM
Thanks for all the advice guys,looks like i will stick to mad efi up grades and NO nos.

Skaterfast
11-22-2002, 09:48 PM
Sometimes it takes bigger balls to say no.I'm so proud of you CC257.

snappertapper
11-23-2002, 07:20 AM
LOL :D

Cole
01-14-2003, 05:17 PM
What about 2.5s..i was told that nitrous can cool the motor down with shots every 5 secs too gain the rpms needed?? Cole

77charger
01-14-2003, 09:32 PM
the wonders od nitrous.It is not as bad as everyone says(most of them have never even used it too).I have palyed with it on my jet boat and never regret it.It helped all around and gave me an extra 350 rpm for a 100hp shot.Now if i were going to go over 150hp its another game.nut 100-125 is SAFE.Best thing was i only used it when i wanted to and was a cheaper way to get the extra power and to see how much more 100 hp helps before forkin the cash over for some headwork(which i never did do)Just bought an i/o instead :)
Stv keith a nitous unit that will give you 3300 rpm.Well ihope you have spare motors.

737jetmech
01-15-2003, 02:22 AM
I have a Nitrous system on a 2.5 offshore motor .It's not all bad if properly set up.The enrichment fuel that is used on mine is alcohol.The EGT is 100 degrees less during a nitrous pass than just on the motor.I still run the rev-limiter that is set at 7800 rpm.The acceleration of the boat is where I see the most gain with a 10 mph improvement on top.With a 10 lbs bottle about 5 passes are all you get.So if you plan on doing alot of racing you better have 2 or 3 spare bottles.If anyone is thinking about running this do your self a favor and consult someone like Ckuck Goodman at HydroDynamics.He is the man when it comes to nitrous on 2 stroke outboards.I don't concider myself a expert,but I have learned alot about it from Chuck.There are many systems available. I run a 130 hp stinger SS with auto wash module. smile_sp