rockSTAR_SS

iTrader: (4)

The purpose of this thread is to better inform me of what I'm about to be dealing with. I'm getting my car dyno tuned Monday. I'll be running a 2.9/42 lb injector set up with a 55 wet shot and meth injection.

Yes, I know meth can allow me to run a bigger shot. Yes, I know that meth can also allow me to increase timing and run higher octane. Finally, I also know that meth is used to cool the intake charge air. I've read around a little bit and figured out this much

As far as the nitrous goes, I know that it cools the fuel, yatta yatta yatta... On to my questions.

1.) I've had mixed opinions and suggestions about tuning for meth injection. I understand there is a risk of blowing my engine if I run out of meth or if the meth somehow stops pumping. I've made the decision that I do NOT want to take this risk. I don't want my car to depend on meth injection to run. By making this decision, I realize that I won't get the full potential that meth offers me. I'd rather stay on the safe side and simply use it as a cooling modification. My first question is, how do I safely go about using meth as a cooling mod without the risk of blowing my engine?

2.) My next question is, should I tune for nitrous?
3.) What are the benefits if I do?
4.) Will it be a waste if I don't tune for nitrous?

I have a simple Zex wet shot kit. No fancy bottle heater, purge kit, etc etc. I mean, I do have them, but I'm not installing them on the car. I'm helping a friend sell them. I was told that it would be difficult to tune for nitrous because of the difference in pressure.

All in all, I want to safely, yet aggressively run nitrous and meth on my 2.9/42's set up. Any input is greatly appreciated, but let's try to keep the nonsense at a minimum please. It's kinda important and I'm posting this to learn a thing or two...

Thanks!

scott allen

might want to get bigger injectors and a better fuel pump.

rockSTAR_SS

iTrader: (4)

I can understand needing bigger injectors, but 60's aren't within my reach right now. Is our fuel pump really that sluggish?

scott allen

well when your spraying you dont want to run out of fuel,thats for sure.

rockSTAR_SS

iTrader: (4)

Or nitrous

But yes, you're completely right. Hopefully it'll all work out nicely.

On a side note, how are you liking the TVS? According to your sig you have a pretty nice set-up.

yellowltcoupe22

our fuel pump can handle it.. its the same pump thats on the ss/tc and it handles that cars needs very well. so fuel pump isnt needed. the fuel pump thing has been debated over and over and no one can give a real reason for needin to upgrade since no one has had a problem of not enough fuel unless it was cuz the injectors where maxed out.

rockSTAR_SS

iTrader: (4)

Thanks. I needed that reassurance. I thought that was the case.

I'm curious, excited, and nervous all at once to see how it's going to turn out. Monday can't get here fast enough.

yellowltcoupe22

lol it'll be here soon thou. any word on when the MP will be in?

rockSTAR_SS

iTrader: (4)

e-mailed them this evening. I guess I'll hear from them tomorrow.

CobaltLs_14

1. use a 3:1 meth ratio and check it every other day
2. yes tune for n20
3. you dont blow your engine like i did
4. no its not a waste but then again its not needed either

rockSTAR_SS

iTrader: (4)

3 parts meth 1 part water or vice versa?

May I ask what size shot you was running?

CobaltLs_14

vice versa 3 parts h2o i part meth...
the more meth you use the more your car is gonna rely on it thats why start off small and work your way up if u would like.

i ran 3 didferet shot a 50 100 and 150 but now i'm gonna run a 75

ssyellowss

iTrader: (1)

if you get a fuel pump that flows at a higher rate/pressure you wont need to upgrade injectors. more fuel will flow through the injectors for a given time with a higher fuel pressure.

rockSTAR_SS

iTrader: (4)

As it's been said before, the fuel pump isn't the issue. And injectors have their limits man. Pretty sure going over the 42 lb limit wouldn't be good

ssyellowss

iTrader: (1)

think about it. you can essentially raise the limit of the injector by increasing fuel pressure. its simple fluid dynamics. a 42# injector at 43.5 psi (which is what most injectors are rated at) become 49# injectors at 60 psi. think about it. you're injecting more fuel with a higher pressure at the same pulse width. with a pulse width of 1, 60 psi fuel pressure will inject more fuel than at 43.5 psi. im not worried about the max duty cycle of the fuel pump. im just saying with a higher flowing pump will you will inject more fuel at a given pulse width. if you dont want a new fuel pump thats fine, im just trying to explain my reason for suggesting it.

BlkWdoSS

iTrader: (7)

I dont know all of the specifics but I am gonna be running a 3.0 on 42s with a 55 shot and meth (50/50), I am getting a clutch installed very soon and then Im getting a nice discount on some dyno time and tuning from a friend, ill let you know how the results turn out. Ill prob have a couple different tune files for with meth alone, meth with nitrous, nitrous alone, and no meth or nitrous. (I have HPtuners so I can reflash PCM @ any time)

damien

iTrader: (3)

Fuel pump isn't needed.

ShortStack

If you use meth inj without tuning, you will lose power.

You would have to use a high mix of alcohol / low water to lose the least amount of power. Meth also messes with you AFR, so a tune is neccessary anyway.

If you use meth, use a 50/50 mix, and just tune it back up to the normal power. Change the AFR and such. The thing is though, meth will make u richer, so you tune leaner. If you run out of meth, you wont be adding the extra fuel so you will end up going lean. If you just minutely mess with the afr and spark, you will not be at such a risk if you run out, although the chance will still be there. You can hook up LEDS to a fluid level indicator, and some control boxes have a "foul" light indicator.

If you want to run nitrous, you may want to pull a few degrees of timing.

Balance out according to what you want to do with your meth.

rockSTAR_SS

iTrader: (4)

This helps me a pretty good bit. I figured I would have to do some type of tuning for meth, but I don't wanna put a huge risk of losing my engine out in the air. I want the tune to be a modest one that mixes everything together nicely.

cradleoffear06

how do you have the nitrous and connected?? both through the intake tube??? or one on the intake tube and a throttle body spacer tapped for meth or n2o??

because i am planning to do n2o and meth and i was thinking a throttle body spacer tapped for n20 and a supercharger spacer with 2 ports for meth.
how does this set up sound??

rockSTAR_SS

iTrader: (4)

I ended up buying a meth kit, but not installing it once I got it. I weighed the consequences and decided that running meth on my daily driver isn't the way for me to go. I also couldn't find anybody locally that sells methonal, so I just said screw it. Now I have a meth kit in my closet just sitting there...

But yes, my nitrous is tapped into my intake. If I had a throttle body spacer then I would do it that way. It sounds like the way you want to do it is a good way to go about doing it.

cradleoffear06

are you going to sell the meth kit then??
if so i might be interested in getting it...

rockSTAR_SS

iTrader: (4)

I've got a friend down here that is getting a tvs within the next month or two and he wants it. I'm probably going to sell it to him. But if he falls thru then I'll put it up in the for sale section. Keep your eyes peeled.

Deathscythe

you're talking about meth like it's the same setup as gas when it isn't. If you have it set up right, it only feeds meth into the intake tract when you are in boost, and if you really want to control things, just get a controller for it. It'll have different adjustment points where if you don't want it to come on, don't use the right foot like it's a concrete block. If I'm not driving hard, 1.5 gallons of meth will last over a month for me. And that's with a 7gph nozzle.