thx Dzenno! my setup are a28@28psi with alky control progressive controler kit with twin nozzle m15 ,m10 tappet to the y pipe i think my mistake was pressing the test button flowing 100%pressure before each run creating a pool to be sure there is enough cooling up there! i have a psi ramp and a **** for ajusting my meth
meth starting to flow at .4 bar maxing out at 1.2 bar

 

Oh man, that is a TON of meth! That is one of your main problems, the other is triggering your meth kit to spray with out going into boost as there's no charge air going through under pressure/speed to atomize the meth you're spraying in very large amounts pooling it in the charge piping/intake manifold.

Spraying based on boost pressure alone is also a very bad idea and this is why I asked about the meth kit used. Even with the progressive setup such as yours there are times, such as through shifts or throttle lift as diverter valves vent boost, that boost will be there but the ECU is cutting fuel and or spark and yet your meth kit continues to flow as its seeing boost either pre-throttle (OEM TMAP sensor) or in the intake manifold/plenum, which can also cause this issue you had especially given the volume of meth you're spraying.

People should really strongly start considering making a switch to Aquamist HFS-3/HFS-4 kits for their PWM (pulse width modulated) injection approach and an injection strategy that is based on fuel injector duty cycle. This is really really important and missed by many enthusiasts adding meth kits to their cars. We have years of experience tuning FI platforms with meth and we strongly believe we've seen all of it when it comes to things you simply don't want/shouldn't do and how to get it done right.

Are you still on the factory ECU? How is your boost controlled and where is the meth kit tapped for a boost reference?

Dzenno@PTF

 

zenno heres my log before everything blew :look at the intake temp skyrising in a frac sec

http://datazap.me/u/mike/log-1445544140?log=0&data=1

was in 3rd speed full throttle and then bang! remak in that before run i was sprayed meth whithout boost !

 

Yea its highly likely that your pre-spraying was the biggest culprit here and I'd definitely recommend never doing that again.

Other than that, here are some pointers around your meth setup:

I'm not sure on the flow specs of your injectors but just as an example given you're running 100% meth and not mixing with water a general guideline is to scale your total meth flow to about 20-25% of your total fuel flow (less if you're blending in water, 10-15% if 100% water or 15-20% if 50/50 mix, just generally speaking).

In your example, 72lb injectors on your car (~760cc/min) is around 4500cc/min of total injector flow roughly speaking and ignoring any manufacturer variations but good enough for example sake.

Ideally for meth you're looking to run anywhere between 900-1100cc/min:

4500 x 0.2 = 900 cc/min
and
4500 x 0.25 = 1125 cc/min

Given you have no way of scaling your meth injection based on injector flow like the Aquamist kits do you have no choice but to go with a nozzle selection that would satisfy the largest fuel demand out of your injectors, so 1100-1200cc/min MAX.

Looking at your log it seems at 5k RPM you were at 18ms PW/75% injector duty, 4500x.75=3400cc/min of fuel at that instant leaving your injectors.

Your nozzles, M10 and M15 combined flow at 1600cc/min and depending on pump pressure you could be at 1800cc. That is around 50% of your total fuel delivery in that moment in time. Combine that with extra meth puddling in your intake tract from the pre-spray action you had and you most certainly have the scenario happening that you had.

You can see how this issue can easily be avoidable by following these few points:

1) Never trigger a meth kit into your intake tract while the car is running and nozzles plumbed in for any reason.

2) Use a methanol kit that can inject primarily based on injector duty cycle. Others can be added in as well but the fuel injector duty cycle has to be a primary reference. If the DME or anything cuts out injectors no matter where your boost is, meth has to stop flowing. Aquamist controller would've done that for you.

3) Sizing your nozzles accordingly. If you don't see yourself changing your meth kit to Aquamist then I'd suggest removing the M15 nozzle and swap in an M10 instead, maybe an M7 would work too. Lower your boost and ignition timing and work your way up from there.

Lastly, I notice in your log that your TMAP sensor maxed out under WOT at 2.5bar abs (2500hPa, or 1.5bar gauge pressure). Your boost reading to the DME flatlined as you've gone past 21psi. How/what is controlling your boost and given you can't monitor boost via this log do you have an external way of logging/monitoring it?

Dzenno@PTF

P.S. On our 3076 car we're running dual 1.0mm nozzles which given where our boost is currently flows a total of 900-950cc/min and we're close to 800awhp on our Mustang Dyno.

 

thx for explaining Denno that give me some better knowledge about that stuff
next step is to ramp up meth initial by boost and never again pre charge pipe with meth without boosting
thx


th

 

https://www.6speedonline.com/forums/...ml#post4428963