400HP55

I was reading about how our cars are built - fully forged engine with a V12 Transmission.

Has anyone tried running NOS with the W208? Pros and Cons??

I am seriously thinking about running a 75-100 shot.

betrezra

If you don't get carried away and have a good kit installed right no worries..... and a heck of a lot cheaper 100hp than a blower...... just get used to filling that bottle all the time

Kevwood

Don't runa cheap a$$ dry system, run wet if you decide to go the nitrous route. NX is my brand of choice.

blackbenzz

The pistons are not forged and transmission is from the old V12 cars.

400HP55

Do you guys think I could run 100 shot safetly with a wet system? How many runs before problems start occurring?? I don't wanna blow my car up ha.

betrezra

If it is installed correctly, and preferably a wet system, and you put in the proper safety features... (rpm window switch is nice - gas on @ set rpm range so you don't pool nos in your intake mani off idle and booom)...... etc...... also make sure you fuel system (pump, injectors, lines are in tip top shape)... the big killer is: 1) engage nos to early rpm (off idle then pools in intake mani and back fire which will blow up the intake mani), and 2) too little fuel while on NOs.... then lean and busted motor.

I would have a good shop do the install, and don't get to greedy with the gas.

There are many mod motor mustangs running spray.... as far as longevity there is a reason why people build a motor to stand up to spray because it does add stress to the motor.

Personally I would have the kit pro installed and then use it judiciously.

Kevwood

Betrezra, I agree with you in regards to the RPM switch, it's a very good feature to have included in the system, a fuel pressure switch is another a very good addition for safety. I have a NX direct port kit with progressive ECU controller (not on my CLK), it is the best and safest way to fly.

I do have a comment though regarding your 'pooling' statement. Nitrous is a gas, not a liquid (after it leaves the bottle) so it will not pool in an intake manifold. Nitrous is also non-combustable, you can hold a lighter to it and it wont ignite, so although a backfire through a manifold is of course possible (for a number of reasons) it would not be caused by nitrous 'pooling' in the manifold itself. Also, with your comment about not getting 'greedy' with the gas, a wet kit system should always be running a little on the rich side for safety, not lean as a dry kit does (ran one years ago, learn the lessons). With nitrous (as with any forced induction really), rich is better than lean.

If you are progressive with your spray from low to high RPM (ramp up) and keep the final HP shot within reason you can safely run a nitrous system for years without any internal engine damage. A 50-75 shot on a well maintained MB V8 should be a walk in the park.

PS: Good idea to run high temp spark plugs too but not a requirement.

betrezra

didn't mean to confuse the issue with pooling.... it's meant to show that NOs piling up in the intake tract at LOW RPM is a good source for a bomb with any type of backfire...... NOs backfires are nasty. A way to combat this is to use a window switch so as to not activate the NOS at too low of a rpm.


Didn't mean to suggest it's filling the intake as a liquid


If you want to see a good NOS backfire.. just google and you tube it.... very nasty.


http://www.youtube.com/watch?v=9bRbd3-Myg0

Kevwood

lol, good vid, well, good because that isn't us stuck with the repair bill

bobbyjo9

It's an oxidizer. In raw form you can think of it as the poor mans blower in that it introduces more oxigen into the combustion process. Thats why dry systems can go wrong very quickly and wet are safer. Elaborate systems are there and make real big #'s. There is no cheap way to make "safe" horespower. With a small "boost" level you should be fine for longevity.

Kevwood

Well said and very true.

dohcfiend

one of the most important things is get a really good kit that has the ability to instantly retard the timing once the juice is on. that is the "safest" way to go IMO. making such a kit work with your ecu? unfortunately i have not collected enough knowlege of these cars yet to answer that.

personally I love juice; its so evil. I hate juice; it's so evil.

My formula for a safe kit:

progressive controller
WOT switch wired into TPS(hopefully mb uses 5V tps signal)
Direct port(wet system)
nitrous/timing retard
fuel pressure switch
rpm window switch
increase fuel pressure by 10%
professional installation
professional wideband tuning

1 warning tho, hypereutectic pistons actually shatter if you run into detonation.
another warning, If not properly tuned; Nitrous loves head gaskets.....YUM.

Kevwood

Nice to see you back DOHC

dohcfiend

hey thanx kev

400HP55

Lots of good info. I don't know, seems expensive and risky guys. Maybe I'll stick with just bolt on mods for now...

betrezra

If you just wanted some extra punch in those "special situations" you shouldn't get into too much trouble with less than 100 shot with a good kit.

I've never been a big fan of NOS on a street car daily driver.... I want something that is always there when I want it..... not just 1 - 1/4 mile blast at a time.

ziad-ehden

i share the opinion of Mr BETREZRA,we've blown a 55k engine during summer,the bill was 7500$ !! so i bought a tune for my clk55 05 cpe NA (27k miles) from USA,i downloaded it last week,tested it several times with my brother's clk55 03 : the result still the same!! before & after the tune !! does anyone of you bought a tune to a Normaly Aspirated 55 ??