Compression
Ok. So you think I should hold off using the meth kit because the E85 is enough? I guess the meth is for running 20lbs+ of boost? People say its a band aid and I understand why. But I wasn't trying to use it as a band aid. Just as a safety valve for when I try to run high boost!
Running E85 full time is the safest way you could go (well, possibly C16 race gas may be safer but after the expense, its not worth it). If anyone with more knowledge than me wants to pipe in feel free, but I have never even heard of anyone running E85 + meth injection. The E85 will give you all the benefits you need. Adding meth to it shouldn't give you any added benefit because you already have the full benefit from running the ethanol fuel.
If you want more of a safety barrier, the fuel with E85 is already at its max. At that point, as I made small mention of before, if you wanted extra safety and room for more boost safely, I would drop the CR further.
I Know SNM. I just want to be clear on a lot of things first. So no meth is needed for my CR? Even to 15lbs of boost? If that is a known and I wont f*** up the motor then Ill just leave it in the box.........
You won't blow up your motor with that as long as you don't lean on it and your tune is either crappy or can't handle the hot IATs, which then leads to a ton of detonation and shattered ring lands etc.
So, get it on the dyno, watch your IATs at all boost levels and watch for KR. Otherwise, ain't much you can do really.
So, get it on the dyno, watch your IATs at all boost levels and watch for KR. Otherwise, ain't much you can do really.
I will argue with SNM on E85 and its effects on IAT's. It does cool them and does effect them. Don't take my word for it though, here is a great E85 info thread;
https://ls1tech.com/forums/fueling-i...r-ls1-e85.html
Correct. No meth is needed. If you already bought the meth kit, I would sell it. SNM is correct about just watching it on the dyno and keeping it safe. That will be really the only way to see where the safe limit is. I think you'll probably be just fine at 15#'s and E85, although I don't know about 20#'s.
I will argue with SNM on E85 and its effects on IAT's. It does cool them and does effect them. Don't take my word for it though, here is a great E85 info thread;
https://ls1tech.com/forums/fueling-i...r-ls1-e85.html
I will argue with SNM on E85 and its effects on IAT's. It does cool them and does effect them. Don't take my word for it though, here is a great E85 info thread;
https://ls1tech.com/forums/fueling-i...r-ls1-e85.html
IATs will still be high regardless of what you spray into the motor after the IAT sensor.
IMO.
http://www.chevyhiperformance.com/te...5_fuel_switch/
http://www.theturboforums.com/thread...n-intake-temps
https://ls1tech.com/forums/advanced-...t-cooling.html
http://www.modularfords.com/threads/...-Drop-With-e85
Don't get me wrong, I understand quench and all and I am not going against what you said, but my concern is only with FI. Things on the web is very unclear about what I am asking too.
That's the reason why I am asking questions about quench and FI not just quench alone.........because what im getting at is still having decent quench but not actually worried about being spot on with the recommended .040 of quench.
Essentially you are forcing more air into the chamber where as with a tighter quench and my CR you would have to worry more about pre-detonation correct?
That's all im asking.........
That's the reason why I am asking questions about quench and FI not just quench alone.........because what im getting at is still having decent quench but not actually worried about being spot on with the recommended .040 of quench.
Essentially you are forcing more air into the chamber where as with a tighter quench and my CR you would have to worry more about pre-detonation correct?
That's all im asking.........
Cylinder pressure is dependent on things like static compression ratio, altitude, intake valve closing point, boost pressure, etc. BUT, these things have no effect on quench, only cylinder pressure. The higher your cylinder pressure is, the more you have to worry about detonation. Since proper quench will help control detonation, you need to pay close attention to that.
Quench, OTOH, is purely dependent on the relationship of the piston top to the head surface. Increasing the quench area will decrease static compression. If the quench area is big enough, it will become part of the chamber, where all the action takes place. And that's a bad thing - very inefficient, slow but hot burn, lots of detonation and little power.
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I ran methanol and E85. Even with E85 my IAT's were 185F at the top of 4th gear. So I added meth and my IAT's went down to 45F at the top of 4th gear. I wasn't comfortable giving it max timing with IAT's that hot. Until you build your car and datalog it, you won't know whether you need meth or not. I would use it personally. The only time I wouldn't would be a blow through carb setup as the vaporization of the fuel through the carb body cools the charge way down.
I ran methanol and E85. Even with E85 my IAT's were 185F at the top of 4th gear. So I added meth and my IAT's went down to 45F at the top of 4th gear. I wasn't comfortable giving it max timing with IAT's that hot. Until you build your car and datalog it, you won't know whether you need meth or not. I would use it personally. The only time I wouldn't would be a blow through carb setup as the vaporization of the fuel through the carb body cools the charge way down.
Bro the car is not laggy at all. It drove really well. I dont think your CR is hindering you at all. You should be happy with your results.
My question is, why do you use meth injection if it is not needed as you stated earlier on?
One thing to keep in mind, and this is what I've been trying to convey against SNM, E85 will cool the intake charge and the combustion chamber. This is what is important as if you get detonation, this is where it will happen. As SNM mentioned, your IAT sensor is located a bit up range of all of this, and will not show the temps of what is really going on.
If you spray meth before your IAT sensor, you will obviously see a drop in your IAT's. But as for actually making a difference where it counts over E85, I don't see how it would make an improvement. I would love to see some technical tuning data on this past simple IAT measurements.
If you spray meth before your IAT sensor, you will obviously see a drop in your IAT's. But as for actually making a difference where it counts over E85, I don't see how it would make an improvement. I would love to see some technical tuning data on this past simple IAT measurements.
You may have misunderstood. I said it was not needed with E85. Meth injection is still needed in my setup as I am running pump gas.
One thing to keep in mind, and this is what I've been trying to convey against SNM, E85 will cool the intake charge and the combustion chamber. This is what is important as if you get detonation, this is where it will happen. As SNM mentioned, your IAT sensor is located a bit up range of all of this, and will not show the temps of what is really going on.
If you spray meth before your IAT sensor, you will obviously see a drop in your IAT's. But as for actually making a difference where it counts over E85, I don't see how it would make an improvement. I would love to see some technical tuning data on this past simple IAT measurements.
If you spray meth before your IAT sensor, you will obviously see a drop in your IAT's. But as for actually making a difference where it counts over E85, I don't see how it would make an improvement. I would love to see some technical tuning data on this past simple IAT measurements.
Basically, build it, strap it to a dyno, and see what happens. Log IATs, KR and timing with your desired boost level. Then see what happens when you spray meth, you may not even need it. Until then, this is all pissing in the wind/
I'm gonna start another thread for more research.
My Alky Control kit starts spraying when I hit 4psi no matter what gear I'm in. I can adjust the activation point in the control box, but you don't want it so low that there isn't sufficient airflow to keep it well distributed. There is also a **** that adjusts the ramp rate of the pump. Basically it controls pump starting voltage and thereby meth output. As the boost rises it increases pump voltage to progressively spray more meth. My kit has its own 2bar MAP sensor, so I can progressively spray to 14.7psi. Guys that run more boost get a 3bar sensor with their kit.
