Was lurking over in the Evo forums and ran across an interesting debate they've been having about meth. As you may or may not know, the evo & sti guys love this stuff like a real drug. Seems a stir has been created over the meth kits being traced to cracked pistons:
http://forums.evolutionm.net/evo-engine-tu...so-cracked.html


This was refuted in this thread: http://forums.evolutionm.net/evo-engine-tu...ts-exposed.html

[QUOTE=scheides;8610024]This is a direct response to Mike@AwdPerformance's post http://forums.evolutionm.net/evo-engine-tu...=cracked+piston

I ran alcohol injection on my evo8 for 50,000 miles and here's what my pistons look like:



I have a lot of respect for Mike, but the point I want to get across to everyone that read Mike's
thread is that it is grossly generalized!

 

my question is, what kind of meth to water ratio are they using?

 

Im using 70% Methanol. I have run Meth Injection for over 20,000 miles now. Monday I am going to stop over Minitoyotas when he pulls the head and Am going to take a look and see if there is any visible damage and how much carbon build up, if any is on top of the pistons, or if I have any scoring on the cylinder walls. I will take pics and post em here.

I have noticed the The plugs on the cylinder that is farthest away from the METH seems to look like it it does runn a bit hotter then the cylinders that get it METH first.

Direct port Meth injection FTW

In all seriousness though, once the METH is atomized into the airstream all of the sylinders should be recieving same amount of METH, as long as they are receiving same amount of air.

Its like if you have a a gallon of white paint, and put a cup of blakc paint in it, once its mixed the ratio is proportionate for the entire gallon of milk. Kind of a bad analogy but you get the idea.

Buick Guys have been running METH for decades without problems, and they have more cyclinders that it has to reach. I think some of these EVO guys may just push there cars a wee bit too hard, especially on METH

 

Joey with system are you running? Curious to know the number of S2k owners running progressive kits opposed to always on kits

 

I run the AEM Water METH Kit

Comes on at 5psi, ramps up to 550cc/min (largest nozzle max blast) by 10psi and stays there until 23 psi

Once I get my car back I will do a video of my setup and the kit in action. There is no denying, when I go WOT I wacthed the IAT go from 120F to 70F in a matter of seconds on a 95F day, now take a cool day where the IAT without METH are 75F, start to spray METH and the IAT's will Drop to like 40F, lol

That being said it still didnt prevent me from popping a HG, but thats more Pressure related I believe anyway.

I think my problem had more to do with 5th & 6th gear pulls on the highway in 95F for an extended amount of time

Also after I do WOT pulls and pull over to the pop the hood the number 4 Intake runner is just as cool as the number 1.........(not scientific I know)

 

i run a aem meth kit, progressive style pump, but i dont use it to run more boost. i use it for 2 extra degrees of timing and to cool the intake charge.

and arguably, i dont even need the meth for the extra timing. anywho, anyone else running one?

 

^

What is your timing like?

at 21psi I am 21 degress

 

ROFL. at 10psi i am at 20 degrees with meth, and 18 without.

 

I'm using the AEM kit as well. One thing I have seen people do is angle the position of the nozzle spraying WITH the intake stream. The nozzle should be angled AGAINST the intake stream so that I can distributed evenly. Esp with the OEM intake manifold, the first runner takes up almost half the plenum! If your spraying with the stream of the intake; almost all of your methanol will run into that runner.

Most people wouldn't be able to tell unless your running EGT gauges on each runner. I've never had any problems with my kit. My settings are set to start spraying at 8 psi and to have full flow at 24 psi using the 550mL nozzle. The fail safe reverts to spring pressure @ 7 psi. I use very little of the meth (I'm running a 5 gallon kit which I will probably get rid of the tank and run a 1 gallon tank soon).

For me, the benefits are great with such a small risk. Having a tuner that can really explain what the methanol is doing and how to protect the motor against anything bad happening is reassuring. Not doing the proper research or even reading the instructions that come with the kit can cause a LOT of problems. I think this is a great thread for the FI forum. There are a lot of things that we can all learn from each others experiences! Lets see some more!

 

Same kit as above: Aem w/550cc nozzle w/progressive controller. 8-10psi ramps up from there.

If I could find or adapt a setup to directly injected each plenum I'd go that route this time around.

I could see how each piston looked a little different due to the amount of heat it saw when I pulled teh motor apart.

I did not suffer any detonation, which is what I wanted the kit for, but at 25psi+ 650whp+ it couldn't pull the heat out of the motor fast enough causing my cylinders to taper and loosing compression.

To be expected I guess.


Small off shoot of a question: Anyone done a direct port system?