SPRAYED 01

iTrader: (22)

Please list your target afr off Meth and what it is with the meth on

List nozzles sizes and quantity.
Straight or mixed.
Progressive or not and boost level

Just wanted to compare

Im running 2 m15 noxxlrs on straight meth.

My target is 11.8, i get an actual of 10.5afr with 20psi boost

Slowhawk

iTrader: (12)

Alky kit 2-15's. Controller set on 6, 100% meth, 93 octain

target and actual 11.5-1 , Same A/F from 10psi to 24psi. Tuned off VE

SPRAYED 01

iTrader: (22)

Your afr is the same with the meth on or off?

MillsMotorvation

3 #6 spray nozzles, 11.0p AR. Boost 14psi

SPRAYED 01

iTrader: (22)

Millsmotorvation
What's your afr with no Meth?

cyipher

iTrader: (1)

you need to lean your a/f back out with the meth on...

SPRAYED 01

iTrader: (22)

I think i should be more clear. My target of 11.8 is with no meth. My target with it is 10.5 (for the moment) im just wanting to see what guys are shooting for off it,in case of a failure and how much the meth brings it down from there

T/A KID

iTrader: (12)

1 14gph nozzle changes AFR one full point. I use 2 of them and spray 50/50 so it just changes 1 full point instead of 2. You can gain some power by leaning out the MAF or VE table, but I like a little safety net incase the meth doesn't work. I say run it a little fat on Meth and don't worry

Slowhawk

iTrader: (12)

The meth is a constant fuel and the VE is fully tuned to it.

Before my car was tuned to 11.5-1 with no meth. As soon as I turned it on to tune to it the car just backfired from being too rich.

I never tune a car to be used IF they feel like turning the meth on. They are all tuned with the meth. The IAT table is tuned to pull timing hard if the meth fails. Haven't lost a motor in 10 years tuning meth like this.

1969x11

iTrader: (36)

Good info Subd for when I get a meth kit.

SPRAYED 01

iTrader: (22)

Oh ya i mine tuned for themeth on all the time. iv was calculating my command afr in pe and to lean it out from 10.5 to 11.0 my command with no Meth would be like 13.0. Just wanted to see if that was in line with every one. Basically my dual m15 is taking up 2 full afr points

Johnv

I'm running 2 #10 jets , progressive controller, 250 psi pump.
was tuned for 11.8 afr on pump gas, would dip into 10 AFRs on meth with no changes to tune.
I have just retuned to 11.2 AFR with meth, comanding 11.2 in PE and retuning the boost VE table to aheive comanded AFR.
Huge difference in response and power delivery with the leaner overall tune.
I also use IAT timing table to pull timeing at temps above what would be seen on spray,and actually use it to add some timing at the much cooler temps it does see on spray.

Yes if the meth failed you could risk your engine, but same deal with one fuel pump failing or an injector etc.

I have an indicator LED to tell me pump is running, and keep an eye on IATs via scan gauge to be sure temps are dropping when spraying.

smokeshow

iTrader: (17)

AFR is relative to the fuel content. You must specify which scale you are using when doing these comparisons. For example, I target the same AFR on gasoline as I do when tuning for meth because that AFR value is just a result of lambda. The lambda value I target with meth is around 0.78...about the same as on gasoline. I command stoich all the time because the meth makes up for the extra fuel requirement...but the lambda value is always what I want it to be. AFR follows suit with lambda.

Realcanuk

Tuning in AFR is futile. Tuning in lambda is a must, and even more so when mixing fuels.

Ferocity02

iTrader: (60)

I tuned for around 0.8 lambda w/o meth, and then with meth and no tuning it went down to 0.67-0.7 lambda. I am spraying 50/50 water/meth at 15gph. I had to retune with meth, I'm at around 0.78 lambda now with it, which I think is pretty safe. My fuel is 91 octane (~8% ethanol).

Atomic

iTrader: (37)

.8 lqmbda with no meth and 0.76 with. 2 14 nozles