AlkyControl Microtech Install (FC3S)
 

I've finally got all the bits together for my alkycontrol install but I have a few questions about the interaction of my LT10s Microtech with methanol and how it will respond.

Maybe this thread should be in the microtech section but I'm hoping some guys with experience using microtech's and methanol can give some input.

My setup is this, I'll be running the alkycontrol system, dual post turbo m10 nozzles with all the braided lines etc and bits supplied by Julio, I am running the gauge setup he also supplies. I have got a dual EGT setup, will be using the koso dual display with the stinger probes and an innovate wideband. For the placement of things I will be modifying the outlet of the stock intercooler to give it a nice 180deg radius straight into the throttlebody with the nozzles as close as possible to the intercooler outlet and the IAT will be placed in the greddy inlet bolted to the throttlebody. I only want to run a top mount if I can, I want to keep the intercooler piping as short as possible and with the methanol I'm hoping I can get away with it and not have to worry about the heatsoak too much.

My main concern is the tuning of the ECU when it comes to the addition of the methanol and the response of the LT10s if there was to be a loss of methanol for any reason.

Should I tune the ECU without methanol injection so if it fails, it will be running to normal AFR's but this will give me less power but a good rich safeguard?
I ask this because I don't know how the LT10s will react with a methanol loss. I know that the o2 0-5v input into the ECU doesn't actually affect the ECu so a change in AFR will only give me a visual indication, my understanding is it's only used for display and datalogging. The IAT will be affected also from the methanol but does this actually change anything within the ECU?

Any input would be good, I am open to ideas here for change of setup's etc as I won't be starting the install for a few weeks yet.

I know I could could another standalone unit to monitor knock, but I'm hoping I can get away with this for the time being, maybe I'll add this at a later date. I don't want to have to change ECU's...yet...but maybe if knock sensing and o2 input is something that I can use and will actually affect the tune, this might be an option, again at a later date, I'd atleast like to get the setup I have running.

congrats on picking Alkycontrol!

assuming you plan to run 100% meth, it depends on how much you are injecting as to what might happen if you had a malfunction.

to answer the question:

Masterpower 596

6.77 average sq inches area Compressor

GT35R 6.386

TO4Z 7.0

compressor- wise dimensionally your 596 is between my small and medium sizes. (see "Turbo Comparison" thread in Single Turbo Section)

things get interesting on the hot side... as in Large.

6.889 average sq inch area.

GT35R 5.171

TO4Z 5.89

the hotside will deliver less back pressure and retained (in the engine) heat. +

peak airflow is .49 kG/Sec or 65 pounds per minute at 29 psi

peak airflow at 14.7 PSI is 55 pounds

the compressor map shows more air at less efficiency but i am using the typical norm (60%).

SAE RW rotary HP is 490 at 29 and 414 at 14.7

at 490 and 11.2 AFR....

65 lbs air/ 11.2 = 5.80 pounds gasoline or .91 gallons per minute

.91 X 116,090 BTUs = 105,641 BTUs from gas to make 490

M10 nozzle = 630 CC per minute

you said "nozzles" so 630 X 2 = 1260 at 100 PSI Net of boost.

Alkycontrol makes about 130 PSI net of around 25 psi boost so

130/100 = 1.3 times square root = 1.14 times 1260 = 1436 CC Meth = .379 GPM

.379 X 57,250 = 21,697 BTUs from meth (net of cooling)

therefore, if you did use 2 M10s and tuned for 11.2 your fuel would be

105,641 - 21,697 meth or

83,944 BTUs from gas

21,697 from meth (25.8%)

if you lost the meth your AFR would rise from 11.2 to 14.09

you might find that one M10 w 100% meth would lower your IAT significantly and be a bit less risky. or perhaps run a 50/50 WM mix.

howard

15psi for 415 hp
 

Howard, thanks for the calculations!

As it stands I only intend to run 15psi, so with this I'm hoping I will be looking at around 415hp.

Julio recommended to run the dual m10 nozzles, I had thought on running 100% methanol but if I can build a bit more of a safety margin into the car, maybe a 50/50 mix could be the way to go.
From reading other threads, I have seen comments such as it's a waste of time running water injection if you're pushing 15psi through the engine, would you agree? I think a 50/50 mix could be a good compromise!

Can you check my calculations below, I had different figures for the fuel flow calculations, I’m using your 14.7psi as I can’t find a reference for flow at 15psi!

14.7 psi @ 55 pounds.

SAE RWHP 414 @ 14.7psi

414hp tuned to 11.2 AFR

55lbs air / 11.2 = 4.91 pounds gasoline (0.82 gallons this figure I’m not sure about!)

0.82 x 116,090 btu’s = 95193 btu’s from gas to make 414hp.

The net PSI for running at 14.7psi I’m not to sure about, so I will go for 100psi.

630 x 2 = 1260 @ 100psi

1260cc/min = 0.332 GPM

0.332 x 57250 btu’s = 19054 btu’s from meth.

95193 – 19054 = 76139 btu’s

20% cooling from meth.

11.2 afr x 20% = 13.4 AFR (Not sure about this either, can I just increase the afr by a %?)

Howard, one more question sorry, can you show me the formula for fuel in cc/min required for HP?

My fuel setup is 2x850 and 2x1680...giving me 3780cc/min. Is this enough for 450whp?

I'm thinking about going to ID2000's as secondary and FD550 primary. Which is a very similar calculation but much easier to tune!