I am thinking of putting a meth injection kit on my car. I have a single turbo, front mount intercooler, and tune with a power fc. I am looking at only performance/hp increase at same boost levels, does not have anything to due with being able to run higher boost on pump gas. Wondering if anybody has any experience with this, tuning, and how the car runs with no meth after tuning for meth. Any input is apreciated. Thanks

 

The car will run very lean if you tune for meth and run it without meth. I wouldn't risk it personally. Currently I'm using Snow's MAF II kit it with my supercharger setup as an insurance policy/IAT reducer and it's very nice. I have two nozzles (one 100ml/min before the blower, and one 60ml/min after, which cools the intercooler) and the IATs will go below ambient if I drive hard enough. You'll need just a single nozzle, probably above 175ml/ min, and If you plan on spraying post TB you'll need a solenoid to prevent the engine's vacuum from siphoning your methanol.

My car was running like it was winter time in 100 degree heat. The other added benefit is that you'll basically be steam cleaning your engine. I have a friend that posted some pictures on the rx8club forum showing "these are your plugs, and these are your plugs on meth, any questions?" He had only been running meth for a month or two and his plugs went from black to looking new.

Here's a pic of my engine bay:



The red tube coming from the washer fluid reservoir connects to the solenoid, which feeds a T-splitter that feeds both nozzles (pre and post supercharger). My washer fluid reservoir is where I keep the meth, and the pump fits nicely behind it. Some folks that run track put the pump in the trunk with a huge tank that holds several gallons. The half gallon washer bottle works for me for daily driving and autocrossing.

 

see the auxiliary injection section

 

Thank you for the input. I figured It would run lean with no meth after tuning for it, thats kinda what I was afraid of. Any malfunction with the solenoid, pump ect and you have a lean condition. I do run a wideband but that dosen't mean I will be paying attention at all times to what it is reading.
I think Im going to install a kit though. Do you know how to size the nozzles and how often are you refilling the 1/2 gallon of meth? BTW nice car bastage

 

That is not necessarily true. If you are running a considerably small nozzle, you can make use of the meth for it's cooling effect without severely richening your intake charge. A 175 cc nozzle with a 50/50 mix of meth/water (effectively 88 cc of meth [fuel]) is only an approx. 2% increase in fuel with 550cc primary 1680cc secondaries at 80% duty cycle. Assuming you tune for straight fuel, cooling off the IAT should show more of an increase even though it is richening it up by 2%, and that eliminates the worry of running lean if your tank empties or w/e.

Considering people have different opinions on tuning AFR's, from 10.5-12.5, and all still make for good performance, I don't think this little of extra fuel will hurt your power.

 

I went to the section that howard suggested. Alot of help. Still a noob dont know my way around. Trots, that makes sense. I am running 800cc primary and 1600cc secondary so that probably would be fine running a 50/50 mix like you suggested, especially with AFRs being closer to 10.5. But I think after reading a little more about it I will be going with a dual nozzle progressive system. Any opinions on a system?

 

You're right, I didn't take into account the amount of fuel you're potentially flowing. The methanol could be a drop in the bucket, relatively speaking. However, I would still be careful and keep potential failures in mind. Losing your meth will cause some leaning out (may not be much) and will increase your charge temps.

 

Lots of systems out there, or build one to suit your needs.

Personally, if you're worried about engine failure if your AI goes bunk..........just run water. You get cooling of intake air, cooling of EGT's, and slow the flame front down in the chamber since water isn't burning. With a safe tune + water you'll be sitting pretty. Thats what I run in my car.

An added bonus I'm still looking into is that it seems to help TQ numbers...but don't take that as gospel, its just something I noticed on the dyno recently and will continue to analyse.

 

Bastage: Totally, but the way he seems to be planning to use AI, he won't be depending on it at all in his tune, all there is to lose is the perk of that cool intake charge! Plus, hot day, run out of meth, it might just be that day that your motor creeps over the line and BOOM.

I think both water and alcohol have their perks, and the OP should definitely do as much research into it as possible to make up his mind. There is TONS of relatively new information on all Auxiliary Injection on this forum, and if you link off to the Turbobuick forums, much more. Just ignore the bullshit of water vs. meth one is better, blah...

Many people have had repeated success with the alkycontrol.com systems by Don Julio, but it seems to be more geared towards straight meth. For a relatively simple, reliable, progressive system, it seems to be the best. That said, I went with a snow performance progressive kit, because I picked it up off the forums for cheap used. I guess it comes down to how much you are relying on it, whether it be as an auxiliary fuel system, or just an add-on to cool the charge.

I will be running 2x 375 cc nozzles, with a 75/25 meth/water injection, because I like the characteristics both of water and meth, it'll be a bit cheaper, and because the system I have can't handle straight meth. Plus, with this ratio, I'll have almost exactly the "suggested" amount of injectant based on my power goals.

Aquamist seems like another cost-efficient alternative. There are many systems out there that can do what you want, best bet is to read read read!