How much HP does meth really add to our N54's????

[LostMarine]

Okay I've got a major newbie question, but I need to know!

The meth ONLY comes on when you reach a certain boost level that the 93 octane (or whatever) cannot handle..... correct? For example when I am casually merging onto a highway and my turbo spools a little bit, the meth will not come on since I am not WOT or near it.... correct? Just wanted to make sure.

As far as the motor quench problem goes, I am a bit confused. I did not think that the amount of water would affect the motor as long as it was properly mixed with meth/alcohol or whatever. Maybe one of you guys can explain to me exactly what quenching the motor means in simple terms.

depends on boost hit, not throttle. basic kit will spray 100% flow @ xx psi (whatevr you set) prgoressive kits will back that down to a set % (user defined) and start spraying that % @ a set boost psi (user defined) and the increase % until a set psi (user defined) is met for 100% flow.
basically a basic kit will do 100% @ 8 psi, and spray 100% all the way through 100 psi.

a progressive/failsafe kit will spray, lets say in my case, 15% @ 7.5 psi and 100% @ 16psi

if your not highly modded, stick to a CM7 and call it a day. I would HIGHLY suggest a failsafe, as either tune will allow you to run a daily 93 oct safe tune, and ramp it up to a more aggressive map when your meth flow is met. and also revert to lower map when done "playing" or if there is not sufficient meth flow to support your chosen more aggressive tune.

keep your mix somewhere between 50/50 and 70/30 for your current wants/needs

[themyst]

I have not quenched under any circumstance, the point I am trying to make is when you are spraying a large nozzle, you are putting that much more water into your charge. Imagine what happens when all that water doesn't atomize/evaporate. Better safe than sorry.

[Sticky]

If a smaller meth nozzle and a ratio of say 70/30 can satisfy 18psi at max timing I would be all for it. The challenge is that is not the case. The tuners clearly don't want to advocate running large meth nozzles and cranking the boost higher than 17 psi but numerous logs of ignition timing at the higher boost levels indicate that the larger meth nozzle with a high concentration of meth can indeed support higher boost levels. I personally had max timing at 18.5 psi on a dyno with far less airflow than rowing through the gears on a highway run. That says a lot.

I see, I see. So with a 50/50 mix what is the boost that people run then?

[themyst]

I see, I see. So with a 50/50 mix what is the boost that people run then?

Never ran 50/50, always 80/20 or 100%. I would say stick with a small jet like a DO5 and 16 - 16.5psi is a safe range for that mixture. You'll get the cooling and timing bump needed to support the 1 - 1.5psi over pump gas boost levels.

For the JB3 guys - That'd be Map 8.

[jpsimon]

my CM10 nozzle was delivered yesterday, will install this weekend and report my findings.. but from the logs I've seen, it looks like it will be a nice improvement over the M7 at higher boost levels

[themyst]

my CM10 nozzle was delivered yesterday, will install this weekend and report my findings.. but from the logs I've seen, it looks like it will be a nice improvement over the M7 at higher boost levels

You will wonder why you didn't get this nozzle in the first place. almost 19psi on 93+meth ftw.