924Board.org

[Fasteddie313]

Just an idea...

Either replace the TB with a big a** carb or install carb in the middle of charge piping somewhere stuck wide open..

Modify the carb to "blow through" design I imagine by running a line from the charge pipe to meth tank to equalize the pressure so they will follow each other in pressure constantly adjusting/equalizing fuel pressure to charge pipe pressure..

Jet carb to achieve decent water/meth AFR. Anyone know what that AFR is?

The point is to simply Carb the meth into the air instead of trying to inject it with a complicated electronic controller system..

Does this sound feasible to carb meth in by either replacing the TB with a carb or putting a carb inline stuck at WOT?

Raining cats and dogs here today..
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80 Turbo - Slightly Modified

[Fasteddie313]

Something like this....



Either stick the carb WOT and control throttle with TB...
Or stick TB WOT and control throttle via carb..

Either way carb is responsible for introducing water/meth at proper AFR for the amount of air that passes it, just what a carb is intended to do but with a different fuel and maybe different jetting..

I think it would be best to also use the carb as a TB because they are designed to introduce fuel varying with throttle opening.

I believe moving the TB closer to the dizzy metering plate would increase throttle response vs dizzy fueling response time.. But that would make for a whole lot of system under vacuum with the throttle closed at idle where vacuum leaks are the most dangerous (lean)..

Whaddaya think?
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80 Turbo - Slightly Modified

[Fasteddie313]

Or...


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80 Turbo - Slightly Modified

[Fasteddie313]

Hmmm... Maybe this method could also be used for gasoline/E85, additional fueling for running higher HP than the CIS can support on its own, add extra fueling at carb and tune CIS around it for them to supplement each other...

Valve on carb fuel, start and warm your car on CIS alone with carb fuel off.

Y from fuel dizzy to WUR with 2 on/off valves and a manual pressure regulator..

dizzy-Y-valve-WUR, and dizzy-Y-valve-regulator.

Keep WUR tuned to running on just CIS.
Tune manual pressure regulator to running CIS + carb..

Warm up and drive your car normally on just the CIS and WUR, after warm when you want to drive aggressively turn the fuel on to the carb on, open the manual regulator to dizzy and close WUR..

Like switching to a different map on the fly with EFI..

Wonder if you can get a manual regulator to boost-enrichen like the WUR but without the Warm Up part of the WUR...

E85, water, and meth should mix I'd think.. Or a carb for each if not..

meth=methanol=methyl alcohol
E85=ethanol= ethyl alcohol=moonshine

25%meth+25%water+50%E85?

Do you really need methyl or will ethyl do fine?

75%E85+25%water?

Is there some magic that needs meth or what?

Fuel RON MON AKI or (R+M)/2
methanol 108.7 88.6 98.65

Fuel RON MON AKI or (R+M)/2
ethanol 108.6 89.7 99.15

No clear winner... Why Meth?

If this stuff pisses you guys off/is annoying I'm sorry..
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80 Turbo - Slightly Modified

[morghen]

How much boost do you want to run from an old turbo? or do you want to use the car on venus?
You dont need meth injection if you have done a propper job cooling the charge with an intercooler. Unless you want to run 2bar ofcourse
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Supercharger and EFI kits
https://www.the924.com

[Fasteddie313]

BMW M12/13 turbo 1500 cc 4-cylinder, about 1,400 hp @ 4.0 Bar ish in 86-87, the most powerful Formula 1 engine ever produced..

No not really, I don't think I'll do any of this stuff but I like to think about what could be done and push it to the extremes theoretically...
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80 Turbo - Slightly Modified

[morghen]

extreme is boring, efficient is challenging !
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Supercharger and EFI kits
https://www.the924.com

[kcoyle]

I think a key point is to have a fine mist, I'm not sure if I'd trust a carb for that when dealing with water.
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1982 931- Stock with MBC at 8psi

Relax, all right? My old man is a television repairman, he's got this ultimate set of tools. I can fix it.

[fiat22turbo]

Why complicate things with a carb? The mist isn't fine enough and it may not clear the valve cover/intake tube or the hood.

Just use an extra cold start injector and plumb it into the intake tract (maybe on the back of the intake manifold, etc) connect it to a methanol injection solution with a vacuum line from the intake to the sealed methanol container (windshield washer bottle, etc.). If you hit the yards, there were different sizes available depending on the size of the CIS-equipped motors.

Heck a spare CIS injector would work.

Either way, the injection medium will need to be injected at whatever desired pressure + the intake manifold pressure to work since everything from the turbo outlet to the combustion chamber will see vacuum and boost signals and those same forces would be acting on the fluid coming out of the injector.

You'll also probably want a low fluid level sensor and an indicator if the injector is "on" or you could run lean and have melted motor syndrome.

Or to make it even more stupidly simple, install MegaSquirt and throw all of this Mickey Mouse mechanical injection parts BS away and tune the car properly with a laptop and a wideband oxygen sensor and possibly a knock sensor (though the solid followers on our motors tend to mess with knock sensors, so they aren't as effective as desired). Efforts and costs will ultimately be similar (you'll want a wideband to tune the methanol injection, etc.) and the end result will be a much more simple and clean engine bay. You can even control methanol injection with MegaSquirt and the proper I/O mods.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)