critisize my turbo build plan
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From: Scottsdale, AZ
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.
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From: Norn Iron
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 ****.
Just build it with a sensible CR and making the power stated will be a piece of ****.
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From: Norn Iron
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.
Thread Starter
On The Tree
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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
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On The Tree
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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
http://www.blueprintengines.com/inde...block-bpls3640
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
http://www.blueprintengines.com/inde...block-bpls3640
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.
Last edited by kingtal0n; Aug 30, 2016 at 01:55 PM.
9 Second Club
Joined: Nov 2003
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From: Norn Iron
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.
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.
Last edited by kingtal0n; Aug 30, 2016 at 02:09 PM.
Thread Starter
On The Tree
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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
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From: Norn Iron
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.
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.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
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
And yes, you would only be spraying the water/meth when needed, again with an appropriate controller.