First experiences with Alcohol at the track.
 

Welp, I finally got to the track with my car. We spent all day hooking up the alcohol and drove it right to the track last night for some testing/tuning. We didn't even get to put it on the wide band to check the AFR's.

Here's my setup, two .016 jets tapped into my lower intake. Inline fuel pump and pressure regulator up front. Fuel resovoir up front with return line. Hooked up to a hobs switch to automatically activate at 12psi.

My first pass was off the alcohol and I ran 12.30@119 with 14psi.

My second pass I turned the alcohol on before the burnout. I did one hell of a john force style burnout and then while pulling up to the light the motor would hardly stay started like I had broke 3-4 apex seals so I turned the alcohol off. I baby it down the track and the engine finally clears up. The problem was....... Since I Had the alcohol on during the burnout and I was purging up and down in the RMS.........it was basically flooding out the engine.

Next pass, Cranked the boost to 1.51 BAR .........I left the alcohol off during the burout and turned it on right before staging. I left bogginr out of the hole like usuall. I rip through the tires (Nitto 555R) /shift to second and it's pulling very hard but got sloppy real quick. It was getting out of shape the hole way down the track up until I shifted to 4th. I had to lift off the throttle atleast 6 times on and off. Anyways I knew my time was going to be shitty because I had to keep lifting and going half throttle. It was another 12.30 @119.

Next pass, After letting my nervs calm down a bit and was going again with the "Go for the Gusto" attitude. I wasn't going to let out no matter what. Anyways so I go up for my big john force style burnout out again and KABOOM, there gos a big hole in my diff:) Anyways we're going to be fitting up an 8.8 this week and going straight to the dyno.

I was very impressed with the alcohol. Pretty good night of testing.

Sorry for my cobbled up post but it was a long night......

I forgot to add. I'm running Alcohol injection.

Fast cars break, baby!

You got it :cool:

Resouce I am just a little confused? are you running alcohol enrichment? or a full alcohol set up?

Your a brave man running with no tuning :D

Alcohol injection enrichment. I'm toying with it as an anti-detonation system plus it should add another 30-35 Hp. This will work great for street use too. I've done some figuring and I should be able to run 22-24psi on 93 octane while having the alcohol activated.

I'll see what happens. I need to get the 8.8 rear end first.

Here are a couple pictures from the night.

I ruined damaged my turbo because of this pinched oil line.

http://mkii91t.homeip.net/Misc/rx7/diff/DSC01642.JPG

Here is the thrown together alcohol injection, I'll be cleaning up the install within the coming weeks.

http://mkii91t.homeip.net/Misc/rx7/diff/DSC01644.JPG

Broke diff from the same night

http://mkii91t.homeip.net/Misc/rx7/diff/DSC01647.JPG

whoo hoo you broken something, meaning that you got alot of powa!

Hey Resource!
If I were you I would remove or insulate that teflon line for the alcohol injector right above the turbine housing. Teflon lines don't like direct heat. They melt very easy and alcohol fires can be very nasty.
The alcohol would have a greater effect if you were to inject it a lot higher up on the intake tract like closer to the throttle body. It makes a huge difference on intake temps that way.

crispeed
87 RX-7 TII
9.204@150.47mph
2600lbs
un-tubbed

I did it that low because I wanted to keep equally amounts of alcohol feeding each housing. I might change it later but it seems fine so far. I'll def think about the teflon line melting though. I didn't realize how close my turbo was going to be until I bolted everything together.

BTW, do you have a live axle in your car? If so could you please do me a favor and post a couple pics so I can get an idea of how you did it. I've bought a 8.8 rear end and we're getting ready to fit it up so some pictures would help greatly.

Thanks cris

Yes I do.
You have two basic suspension mounting types. Either with ladder bars or 4-link. With both designs you can keep the factory shocks in the stock location. If it's a daily driver then you should opt for the the "Pro Street" design which feature large diameter urethane bushings instead of the solid rod ends. They allow some flex and absorb vibration.
What exactly are you breaking on the stock rear? Is it the gears or the LSD unit?

crispeed
87 RX-7 TII
9.204@150.47mph
2600lbs
un-tubbed

I broke the POS torsion differential. What are you running? Ladder Bar? 4 Link? I don't want to tub my car. Do you have the inner fenders cut at all? I'm not wanting to cut any floor pan or fraim rail out. I'm considering just mountin lower radius brackets an going with a ladder bar. Again, could you please share pictures of yours or any other pictures of this done?

Thanks again!

what is the psi of your injection? do it have a pressuer reg? are you sparying only alcohol or water/alcohol?

I think it you should inject farther up stream like before the TB so it has a more cooling effect. and you sould put some kind heat shielding around your tubes I dont see them taking exh heat for long.

I have enough pressure. It's being ran by a 255 pump with a regulator. Like I replied earlier in this thread. I didn't expect my lines to be that close to my turbo when I tapped the LIM while the motor was apart. I'm injecting straight alcohol.

I dont have my injection installed yet but I do remember it saying to not use 100% alcohol. that the mix should be no more than 40% alcohol and 60% water.

So is this E85 that your running?

CJG

The main reason for that mixture is because it's safe and it doesn't pose a fire hazard.

What are you talking about?

its becuase only alcohol cuase more heat.

please enjoy your engine while it lasts...


What is the maximum alcohol/ water ratio I should use?

No more than 50%, otherwise you will increase the cylinder temperature rather than reducing it. Beyond that ratio, onset of detonation is more likely. Methanol freezes at -96 deg. C, 50% mixture will stop the mixture from freezing at around -40 deg.C.

Yes, the BTU absorption of water is greater than a naturally combustable fuel but, water doesn't create any noticable horsepower when used in our engine environment. With using the methanol we want the benefits of reduction of detonation, cooler intake charge as well as the added power of the more highly combustable methanol.