My alky injection plans....

[Frank]

Quote:

Originally Posted by DblTrbl My reasoning for full on or full off is because I really dont drive much between 12 PSI and full boost. Once boost is up to 12 psi, where the alky comes on, it's only a split second before it's at full boost (24 to 29PSI depending on the race). The A/F adjustment is done in the SMEC by reducing gasoline.

Well as an example, 20psi at 4000rpms and 20psi at 5000rpms is quite different. There is a significantly more airflow and that requires more fuel. You can't be stoich at both those points. I hope to get this thing built real soon.

The only thing is that I need to figure out which wideband O2 gauge to use or multimeter. I could just use the narrowband and tap in a small meter to measure voltage.


Frank

[DblTrbl]

Quote:

Originally Posted by Frank Well as an example, 20psi at 4000rpms and 20psi at 5000rpms is quite different. There is a significantly more airflow and that requires more fuel. You can't be stoich at both those points. I hope to get this thing built real soon. Frank

Yep, I agree.

Logs of my wideband show A/F (at 29psi boost) goes from 12.2 at 4000 to 11.5 at 5200. The amount of alcohol is the same but the gasoline amount increased.

[Frank]

Ahh, so its a case of I dont really care. hehehehe

[TRRBOJEEP]

Quote:

Originally Posted by DblTrbl My reasoning for full on or full off is because I really dont drive much between 12 PSI and full boost

+1... I kinda felt the same way... makes setting it up a lot simpler. (we're just lazzier than you Frank) LOL

But, your setup sounds like a good one!

Alcohol Rocks... you're gonna love it!

[Frank]

Actually I am a lazzy piece, however when it comes to tuning, I am trying to take a step up above my normal life. Now I have to get the car running properly first! hehehehe

[Aries_Turbo]

normally he is a lazy piece (and he cant spell for poop lol) but when it comes to technical stuff he defienitely is an engineer.... everything he gets his hands on becomes so complicated that it doesnt work anymore or is impossible for him to build

Brian

[Frank]

Shhhh!!!!!

[turbometh]

Why not use an adjustable kit from ALKYCONTROL?

[turbometh]

After I asked the above question I thought that maybe it sounded like I was knocking your idea. I wasnt. I just got an alky kit and was curious if you have tried it and not liked the adjustability or if you were just wanting to do something on your own.

[Frank]

Not a problem. I mainly what to try something different on my own. This is mainly because it is cheap, and self tuning. In addition, it wouldnt require a cal changes when I turn it on. I just back off a little fuel pressure, add some timing, and egage the system. It might be slightly lean off of idle, but when I am on the line of a drag strip, I wont be at idle... I will be doing a brake stand.


Frank

[Joryn]

I've gotta say this is a very interesting thread. I've just recently become a lot more interested in alky setups when I realized that the controller I plan on using for extra injectors could easily be modified to work with alcohol...and from the sounds of the buzz on the board that is a far better idea anyways.

Any progress on this setup yet Frank? I'm planning on building something very similar actually, a progressive secondary fuel controller (most likely alcohol now) with a bunch of other fancy things built in cuz I can heh. The best thing being, for me anyways, a safety system controlling boost that monitors, knock, O2, EGT(if it's there) to determine whether you should or shouldn't be in boost. It's an overboost cutout pretty much but based on a lot more then overboost.

Anyways, I'm very interested to see how this goes. Specifically if you plan on using regular injectors and running an injector driver to PWM them to control flow. That was somethign I was lookign into but I wasn't sure whether it work all that well. Good luck on the design

[Frank]

I will let you know! Its not going to be till next year now, unless I find time in July. I will be in Santa Fe in August and September, then Nova Scotia for October to Feburary. Yeh it should be pretty simple with On/Off. When on it shares the same PW at the computer, so if I match the injector to the engine and adjust the pressure with an AFPR to compensate for the different mass weight, then I should have the matching fuel curves. Now it will be more stagered injection because I am only going off of one of the two injector banks, but with it being attached right afte the intercooler, it might not matter. If not, I just need to use two smaller injectors and match the presure vs flow to that of my engine's injector.

I am pumped!


Frank