dville_gt

iTrader: (5)

Combo is Lq9, s475 (t6), 26x12x4" intercooler, 12psi, 10:1, 93 octane, 80lb (@3bar) injectors.

Running around in 60* weather my iat's sit around 80* and will go up to about 110* during a pass @ 12psi. Since this is Texas, this car will not have the luxury of seeing these cool ambient temps all year, so I suspect that when it is 100+* outside my IAT's are going to be very high.

My meth kit is "homemade" and already installed (although I have never used it) I am using the Shurflo diaphram pump, a alkyinjection check valve, and a 14gal/hr nozzle installed a few inches in front of my fast acting IAT sensor (right before the throttle blade), and a pressure switch from alkyinjection.

So my first question is what is an appropriate IAT range, at what temp do you start having problems? I have it start pulling 1* at 122*, 3 @ 131, 5* @ 140, etc.

With that said, I doubt I'll be able to stay under 122* when it's 100* outside without meth/alcohol injection. So would it be smart to hold off on the injection until the ambient temps get to a point that it is required? I see that a lot of the kits are "progressive", mine will not be, just based on the pressure switch, is this an okay way to do it? I understand that some kits feature fail safes, but I was thinking I could just be aggressive with pulling timing via the IAT table as a failsafe. Any opinion here?

Thanks!

tomz28

iTrader: (20)

What did you come up with for total timing? And plan on tuning for the summer not right now, but right now the weather gives you room for error.

Get a good base and adjust as things get hotter

dville_gt

iTrader: (5)

seems like 12 psi on pump gas can take ~11 degrees total advance safely, might try to taper in a couple of degrees towards the top of the rpm band, but for now i have it taper down to 11 degree @ full boost and stay there.

if i add the meth injection or run race gas i guess i'll put some timing back into it.

tomz28

iTrader: (20)

Bro you think its crazy now wait until you get some timing into it.hit it with the meth and add some timing. I even pulled some fuel on my car but if you do that you better have your ducks in a.row. With the meth I tuned it on the dyno and add 4degs and picked up 50rwhp total of 16 degs this was on my stock ls1,317 heads, ZO6 cam

dville_gt

iTrader: (5)

are you running your meth progressive or just full bore off a pressure switch?

Louis

iTrader: (7)

You need to turn on the meth and see what IATs drop to. Then make a change.

If you see +20 pre highway pull, and +60 post pull, you should see a GOOD drop, like 50+ degrees.

If it ever sees the temp its at WITH OUT meth, then thats where you begin to pull timing.

Louis

dville_gt

iTrader: (5)

Is it okay to run meth injection w/out a progressive controller?

Louis

iTrader: (7)

For instance-

I typically see the same as you, +20 ambient start of dyno pull, and typically see a 60-80* delta in temp.

With the meth, Ill see as cold as 40-50* pre pull, and 100 post pull. In this case, I would pull 2* @ 100, 4*@110 6*@120 and totally neuter it @ 10* for 130*.

this way, it will surely fall on its face.

When it falls on its face, its alive still, and you are wondering why its falling on its face?

Meth isnt working.

Oh, I fogot to add meth to the tank Or the pumps broken, or the line fell off. This is MUCH better than saying, well, **** the motor is toast.

Louis

Louis

iTrader: (7)

youll have to pull more fuel out of PE if you do not have a progressive controller, in the lower RPMs.

There will be a "hump" in PE where the system isnt fully lit yet, unless its a positive displacement setup.

tomz28

iTrader: (20)

The man has spoken. Louis you must be slow at the shop to be on here lol jk good info I'll remember this one

skinnies

iTrader: (33)

Yep always better safe than sorry!

Nitroused383

iTrader: (10)

In combination with what Louis has said I also add fuel at the same temps the IAT pulls timing. It dumps a ton of fuel and pulls timing in case of a meth failure. I do this on all boosted meth setups and it saved my friends old GTO mutiple times when his meth controller was being flakey. Not sure what operating system you're running but I recommend installing the 01-02 operating system as it has it's advantages.

dville_gt

iTrader: (5)

I am running a 0411 pcm out of a 04 express van, it's got the iat spark table, but which table are you using to add fuel, the iat pe adder? also, isn't running it real rich w/low timing a ringland killer?

Louis

iTrader: (7)

You have to test. As long as its fueled to mid to high 12s and no timing, you can add meth and drop to mid to low 11s on meth with timing.

Lean/er with no timing = no broken parts

dville_gt

iTrader: (5)

When you say "no timing" what are talking about? I see that you are pulling 2, 4, 6, then 10* @130* IAT. How much total advance would you like to see on the meth and without the meth? Say 15* on meth and 5* @ 130?

Louis

iTrader: (7)

Yes, 5* I would consider no timing. Again, depends on the boost and the setup though.

If you use the bi-directional controls in the scanner, you can pull 10* on the dyno or street and really see/feel the difference. itll knock off 200+ hp. Very much an indicator that the meth has broken

dville_gt

iTrader: (5)

So you suggest I go out, put it at 5*, tune it to ~12.5afr, then put the timing back in, turn on the meth, and it should level out to around ~11.5afr? Should I just keep adding timing until I get some KR or is there a number I should aim for?

dville_gt

iTrader: (5)

Oh, and do you suggest 50/50 meth water (washer fluid) or do suggest 100% alcohol? I'd rather stay with the washer fluid since it is so cheap and not as dangerous if there is a leak or something, but what is your suggestion?

Nitroused383

iTrader: (10)

Yes I was refering to the PE vs IAT table. Low timing + rich for a split second won't hurt anything in a 1/2 second while you realize something is up. I prefer the 01-02 operating system over the 04 as it has a much higher resolution in the VE tables. I always run 100% meth and don't mess around with washers fluids that might be 30% meth. Go pour some -30 degree washer fluid on the ground and light it on fire, it's plenty flamable.