kennymox510

Using that website. Id have to travel 30 minutes just to get gas and it would highly limit me to where i could drive the car

Drewstein

If that's the case and no other searches turn up an E85 station near you then a meth system is almost a necessity for what you're doing. If you're going to drive often then go that route.

stevieturbo

Meth is in no way whatsoever necessary. Yes it will help, and can make the job easier...but absolutely not essential.

Just build it with a sensible CR and making the power stated will be a piece of ****.

Drewstein

700 tire with only 91 and no meth or better fuel? I would say something is going to go wrong without more octane. What are you recommending, 9:1 CR?

stevieturbo

It could very easily be done on 9:1, but if you were mega cautious you could go lower.

kingtal0n

iTrader: (1)

imo it crazy to put 5k or 10k into a complete build then run it on 91 alone. You need methanol or the first time you get that motor hot its going to pop. It only takes a couple seconds then the damage is done. With methanol you massively improve the fuel safety window when using 91 or 93. Its like wearing a helmet vs not wearing one, you dont need it but why the hell wouldn't you? Is it really going to break the bank or too difficult to install? Hell you dont even need to use meth, straight 100% distilled water injection would help keep the temps reasonable. A proper turbo setup has a nice wrap and coat along its length... and keeping all that temp in is going to get it... yeah hot.

stevieturbo

If you can't build and tune an engine to nake only 700 on 91, you shouldn't be working anywhere near a car or engine.

Plain and simple

kennymox510

Say i decide meth inj is an option. Which it might be. Could i run the lq9 shortblock i posted earlier with 317 heads (10.8 cr) and then run a 50/50 meth setup and be safe? Or is that still too high of cr for doing it on 91 gas

kennymox510

Is this shortblock still too high of compression for pump gas and no meth? With 70cc heads its 9.8cr.
http://www.blueprintengines.com/inde...block-bpls3640

kingtal0n

iTrader: (1)

Alright, and once the engine makes 700 are you going to wear a helmet, or not?

Because your still crazy to not wear one.

kingtal0n

iTrader: (1)

If you have an engine on a stand in front of you. Inject some fuel into the room temperature cylinder, move it to TDC and give a spark... and watch what happens. The fuel burns with a "thump" and the piston is pushed down rapidly. The piston is able to "get out of the way" of the rapidly expanding gas and temperature, so the pressure does not sky rocket (SPIKE).


Next, heat the piston with a torch to, oh I don't know, 1700*F or so. And NOW inject a spritz of fuel and do the same thing. It will explode violently! It might shatter the piston or pop the head gasket! It depends on many factors; but the point remains: the temperature once reaching some critical threshold is going to cause the fuel to explode violently in the engine. High compression exacerbates the issue but lowering compression only goes so far. At some point, you either need to shut the engine off and let it cool, or inject something (Water) to bring down the temps. Otherwise, you need to make sure it never gets that hot to begin with. Those are your 3 options, make sure it never gets hot enough to become violent, cool it off, or shut it down.

For example, I take this 9:1 LSx 5.3 to the dyno with a huge cam and a 80~mm turbo, spin 7200, I make 700rwhp on 93 without methanol? Sure I do. For the first, and second passes. But if I tried to run the car again and again, make 3 4 or 5 passes, it would probably explode in a shower of oil and engine parts if I did not let it cool off between runs. You have to control the temp rise when you have real power, somehow. pump fuel is NOT friendly with the high temps associated with 'real' power/boost.

stevieturbo

WTF does a helmet have to do with the topic ? Or power made ? or fuel ?

Or do you wear this type of helmet ?

kennymox510

Kingtalon. Im not opposed me a 50/50 meth kit. But will it be good enough for 91 gas daily driving.

kingtal0n

iTrader: (1)

With straight 91 pump fuel and 700rwhp from a 5.3, what you have created is a glass cannon. Use it wrong, or get caught behind enemy lines, and its going to shatter into a million pieces. At least put a helmet on it.



Im not sure of your question. Are you asking will it be ok to use meth injection daily? Water injection will help keep the cylinders clean of carbon buildup, I run it on every engine if I can, regardless of whether its a power house or a daily driver. If you are asking can you drive the engine without meth as a daily? The daily driver routine requires coating/shielding/wrapping to hold temp in the exhaust system. SO if I was going to daily a car with a turbo, properly wrapped/coated, but I had NO methanol, Then I would absolutely require there to be an EGT sensor in the manifold. That way I can shut it down when it gets too hot... before something explodes. All these solutions require us to learn and tune our own engines; you cant take the car to a 'tuner' have him produce 700rwhp on a dyno and say "ok its done". That doesnt work because once the car hits the real street, summer heat concrete traffic, temps get out of hand fast. The dyno is just "one situation" whereas the street is a "ton of situations" and some of those situations on the street will not be good to the engine unless you have the proper safety equipment. With proper monitoring of EGT/Oil temp it is possible to nurse the motor around town, sure, any engine. Knowing when to let it rest: I keep repeating myself.

kennymox510

Im saying if i get the 9.8 cr motor. Put a turbo on it and run 91 gas and daily drive it. Is 9.8 too high to run even with coated or wrapped hot side and a 50/50 water/meth injection setup. If i understand how they work, i wouldn't be using any of the water or meth on daily driving where im not jumping on the gas. But if i get on it, it will spray the water/meth into the motor

stevieturbo

A 5.3 LS will not need a huge cam, or a huge turbo, or to spin to 7200rpm to make a paltry 700hp.

And as said...if you cant build an LS to safely and reliably make only 700hp on regular pump fuel....then you shouldnt be anywhere near the engine in the first place.

kennymox510

Stevieturbo would you be willing to text me so i can ask 500 questions haha

stevieturbo

50/50 used correctly will offer huge amounts of detonation resistance so yes that CR would be fine ( although I'd still do lower myself, as I see no real benefit vs risk for this current trend for really high CR's and boost, although most of those guys are using fancy fuels )

And yes, you would only be spraying the water/meth when needed, again with an appropriate controller.

stevieturbo

From 5000+ miles away ? probably not lol.

kennymox510

Ok.

So bottom line. Will this work successfully and safely.

Lq9 bored 30 over with 9.8cr
Z06 cam
317 heads
91 pump gas
50/50 meth/water
Hotside wrapped
78/75 turbo
700+/-rwhp