Hello,


I'm new to supercharging. I have noticed a number of posts that talk about "alky injection". Can someone explain to me what this is, how it works, and what the benefits are?


Thanks,


LS12NV

 

methanol/ alcohol injection sprays the meth/alk after the MAFS but before your IAT sensor. This does 2 things....

1. Meth has a high octane rating. Spraying it is going to raise the octane in the chamber.
2. Meth is very cool when misted... so you can run more timing as the IAT sensor thinks its cool out. EX... my IAT went from 140 to 70 using methanol. The car does not retard timing when on the meth.

 

add the following:

3. An additional source of fuel, lowers burden on existing fuel system
4. Leaner Air/Fuel ratio for more power, lowers burden on existing fuel system.
5. Cleaner combustion chamber. (prevents detonation).
6. Intercooler not required.

IMHO the IAT should not be moved into the cooler air stream because:
1. Mass Air is meassured at the MAF sensor using temperature at that location.
2. A cooler IAT will Max out the MAF table sooner reducing control.
3. Mass Air does not change as it travels through the engine (so why move it).

What this is:

You install an auxiliary pump (variable pressure) that is controlled by either the MAF sensor, Throttle position sensor, or an auxiliary pressure sensor. These are sensors that measure the variance as a function of voltage between 0-5 volts. The controller is adjustable to vary between 2 voltages say 2 to 5 volts for 0 to full duty cycle for the pump. A spray nozzle, sized for your HP expectation, is mounted after the MAF sensor. You can now pump from your windshield washer tank or dedicated bottle into the air stream as calculated by the controller. The system may need a normally closed servo valve to prevent flow before onset.

You can now spray anything between straight water to methanol, windshield washer fluid, to Nitro Methane (BOOM) or any combination there of.

Power Expectations: anywhere between 5% increase to Kaboom.
Tuning: Power enrichment Table and Timing will need adjustment.
Options: Get and On board wideband O2, (stop guessing).

But then again I could be wrong.

 

You guys are making my job to easy. thanks

 

I have to respectfully disagree....

If you dont move you IAT sensor, then the car will still pull timing when it gets hot. In AZ where temps reach 110+ and 91 octane (oxygenated) at the pump is all that is readily available; I had to relocate my IAT sensor to prevent knock. My IATs reach 140+ on my TT set up. My car begins to pull timing when my IAT is over 110 degrees. Moving the IAT sensor upstream of the meth allows the IAT's to be reduced. The corrosive properties of methanol will prevent you from fogging through the MAFS.

Now I know not everyone has the extreme heat that we do in AZ, but to get the full effect of the meth you should relocate the sensor.

 

I agree with ICULUKN's disagreement, but obviously when it comes to cars, there's more than one way to skin a cat. Personally, I've relocated my IAT sensor.

I understand that the PCM looks at IAT as part of the calculations it does with the MAF. I understand that the MAF will max out earlier with the IAT sensor reading colder. So far, those facts have not caused a single problem for me at all, and I really like the ability to log/view the IAT the motor sees within my existing software.

Once in boost, the MAF is not all that helpful at WOT for my turbo car anyway so I happily say good riddance to the MAF in those circumstances.

Also, we all know an FI car can run leaner if it has less timing, so relocating the IAT sensor gives you one more safety precaution in your setup. If anything goes wrong with your alky system (not spraying at all, or not spraying as much as it should) your motor will see higher IATs and you can set your IAT vs. timing table to pull out timing accordingly. During tuning, I've observed my car run 13:1 and 14:1 toward the top end because it was running out of fuel -- it never predetonated because the timing wasn't very aggressive yet.

 

Do you still run pump gas with the setup?

 

Yes, that's the beauty of it.

 

Yup... all the benefits of race gas.. none of the expense...

 

I've had a Alki kit on my car for over a year with no problems. went from 10 psi on pump gas to 16psi on Alki. My friend bought a ECS kit had some leaking issues he had relocate nozzle higher and this solved the problem.

 

Damn I want one of these kits. It's a shame there's no one in Houston that has experience installing these on C5's.

 

the IAT is much more important to the VE computation (MAP sensor) than it is to the MAF (the physics of a MAF is less dependant on IAT) so I would sugest that the IAT should see the same air temp that the MAP does.

More Than Zero

 

Mine is still sitting in the box it came in...I don't have the time to install it!! I hope someone will soon! I want this thing on the car now!!!!

 

I've had my alky kit installed for a few weeks now, spraying pure meth just ahead of the throttle body. Although I haven't re-tuned or re-dynoed, my boosted car spent the day at Pacific Raceways yesterday and didn't blow up. Maybe I'm superstitious, but running it hard all day on a road course without missing a beat .....I'm a believer. Extra octane insurance without race gas!

And about tracking....my God...driving the FI Z06 is about as much fun as you can have with your clothes on!!! The next mod is the driver with more track time!

 

How far is 21st Cent? They have experiece with these. Well at least when I talked to them on the phone a few weeks ago, they did. They have the same kit ESC has for the same price. Julio's kit....
Julio's kit is the sh_t!!!! nice setup!!!

 

We have sent many kits to 21st century, they have the install down pat. Julio is great to work with for sure.

 

Any idea what increase in power one can expect with one of your alky kits?



Thanks,


LS12NV

 

If I remember right 20-30RWHP gains are typical. Plus the extra insurance of no detination.

 

20-30 is about right from what we have experienced with tuning.

 

Would this kit fit all C5 model years (i.e. 97-04)?