150 PSI pressure on 30 GPH worth of nozzles rated at 100 PSI.

Basically 80 fuel, 20 meth. But actually 40 meth since it takes twice as much to make the same power as pump fuel. So injector duty is reduced 20%, the rest is made through injection to reach desired target AF..in this case 10:1.

This is a 347 auto procharged C5.. same principle.. its just a week ago hit 875 on pump gas/methanol.. still needs more fuel... as his rail pressure is crashing

http://media.putfile.com/02-Z06-347-...ng-out-of-fuel

No water

 

Now it makes more sense - it would be better to say the power was made with a mix of 91 octane and methanol. I wonder how long it will last?

It has been proven many times that lower CR and more boost makes more hp than the other way around provided both steups are run up to the detonation limit on the fuel being used. If the amount of boost is maxed out, the CR can be adjusted accordingly to make max hp.

Rich

 

Nolan has been tuning on injection for a little over 3 years. He's been very fortunate to have a dyno to play with.. Actually they can build a 4.3 for a GMC Syclone.. put the alcohol kit installed on the dyno.. hooked up to a stock PCM.. and tune the engine in.. burn the prom.. and supply the engine to the customer whereby all they do is drop it into the truck.. pop the prom into the computer.. done.

So the longetivity of a 1000 HP race engine.. methanol or not.. is short lived. Part of the game.. in this case, that engine I believe is going to Europe.. their gas abroad is not what we can get.. hence the 91 octane and methanol injection. As long as the alky system works.. and the BS3 does its job on the tuneup.. should live a while.

A lot of the import guys are now starting to build the turbo engines with higher compression. Guess its all how you skin that cat. My current buildup also runs more compression.. spools the turbo easier.. makes more power with less boost.. of course this is ok if you have sufficient octane.

If octane is an issue.. then build it as low as you can compression wise.. it will allow more boost on the same given octane.

 

I put a tank of 87 octane in this week and did a few runs. Surprisingly I didn't get any knock up to 8psi. I however did get knock between 1000-2000 rpm under load. It was pulling 9 degrees of timing. So for those wondering about this, 87 octane will not work for daily driving even on low compression motors. The alcohol appeared to stop the knock up to 8psi at 4500 rpm. I have given up on 87 octane because it is not practical to spray alcohol at such low rpms.

Edit: I have not given up yet. I pulled some timing in the areas where the knock was and it is not knocking anymore up to 12 psi.

 

Not to start an arguement here, but if you played with the tune and pulled timing in those cells you would be fine. It sounds like you ran the same tune and just changed the octane level, which will get bad results like you got. Try changing the tune.

 

Ya your right. I went back and looked at my tune and I have 22 degrees of timing at 1200 rpm and 100kpa which is way too much. I thought I still had the stock timing in those areas. I've made so many changes to my tune I forgot. I'll give it a shot next week when I'm back in town.

 

I had the car up to 12 psi today on 87 octane and spraying denatured alcohol. No knock so far. I had to remove about 2 degrees of timing from the whole timing table to stop it from knocking during daily driving. My timing table looks very much like stock except in the 100 KPA area I have about 24 degrees of timing. Right now I have my AF ratio at 10.5 to 1 for safety but tomorrow I'm going to try to tweak it up to 11.0-11.5.

My gas mileage has stayed about the same.

 

I see motor coming.

Rich

 

Do you really think that 6 points of octane will make that much of a difference?

 

Depends how far you push it. The nature of this kind of experiment is that it works fine until it blows up. There is very little margin for error.

Rich

 

Well I finished up this experiment today at 14 psi, 24 degrees of timing, and 11.5 AFR. I was using shell 87 octane and spraying methanol through my alkycontrol. I could probably go a little further if I pulled some more timing but 14psi is plenty for me. I will be going back to 93 octane now because I want to have some margin for safety. Also I'm getting ready to go to a smaller blower pulley(4.25) which should get me about 3psi more boost.

 

Christ, what's the difference in price between 87 and 93 where you guys live, because here in Chicago it's a whopping 25 cents a gallon at the most? That works out to what, a whole $3.50 extra per $50 fillup? I mean, I can understand tuning for 87 just because you're bored or want to prove that you can, as an exercise, but doing it solely to save the cost of a cheeseburger once or twice a week is retarded, especially with the risks involved.

Every time a thread like this comes up it makes me question humanity as a whole and where our priorities lie. It makes me realize that there are many people out there actually willing to risk thousands of dollars(engine) to save a few bucks a week that they probably don't really NEED to save anyways.

 

Tuning is my hobby. There is no need to question humanity.

 

I understand that, and I am actually amazed at what you have accomplished! I guess every time I see a "Can I put 87 octane in my car with nearly 11:1 compression engine 'cause I am a cheap bastard" thread it just sets me off.

Edit: This is NOT one of those threads.

 

I wish I had time for a hobby.......