Running str8 meth with no intercooler doable ???
01-25-2016, 02:16 PM
#1
Running str8 meth with no intercooler doable ??? 5.3 ,7875 turbo, 243 heads
BTR stage 2 cam ,BTR 660 springs
head studs ,ls9 head gaskets,
80# injectors, 12-15#boost
93 or 100 pump gas
street driven some..
BTR stage 2 cam ,BTR 660 springs
head studs ,ls9 head gaskets,
80# injectors, 12-15#boost
93 or 100 pump gas
street driven some..
Last edited by jaywill; 01-25-2016 at 02:31 PM.
01-25-2016, 05:33 PM
#2
I ran my nova with no intercooler and straight 93 for the first few months . and it worked out ok. I ran 11* timing and 8# boost and that was about all I could get away with . after I installed the intercooler I ran 12* timing and 10# boost with no issues . then I added meth . so I never really got to the edge of pumpgas once intercooled.
I ran 10.54 at 130 mph with the intercooler . id say it was a solid low 11 sec car without the I/C . but you really got to watch the high gear shift for knock.
in my opinion you will get more useable / safer power adding a china intercooler than by using meth alone. the intercooler cools all the air where the meth might have some distribution differences leaving some cylinders more prone to detonation. jmho.
I ran 10.54 at 130 mph with the intercooler . id say it was a solid low 11 sec car without the I/C . but you really got to watch the high gear shift for knock.
in my opinion you will get more useable / safer power adding a china intercooler than by using meth alone. the intercooler cools all the air where the meth might have some distribution differences leaving some cylinders more prone to detonation. jmho.
01-26-2016, 02:00 PM
#4
Kinda depends how much meth you're willing to spray and where you spray it. An intercooler can't up the octane like meth injection can and will always have a pressure drop across the core, reducing the turbos efficiency. (esp. china cores) Generally people don't spray anywhere near enough to accomplish the same kind of cooling an intercooler would. Kjewer got into this in detail on this thread over on YB.
It's pretty interesting. His tests were done on an engine ingesting roughly 1000hp worth of air. He found for every 1gph of pure methanol injected pre-compressor would drop his inlet temps about 1.88*. This was calculated using mass flow, not by a useless temperature sensor in the intake tract.
So assuming common 100* under hood turbo inlet temps (@ sea level). 14lbs of boost with a properly sized 70% efficient turbo. Outlet temps will be about 270* F.
That means to get the charge temps down to a reasonable 150* or so you'd need to inject 63.8 GPH of straight meth. Basically 1 gallon per min. When you see the average meth/water kit pump maxes out around .5 gpm (30gph) it's safe to say the typical meth inj kit will never be as efficient as even a cheap china IC at reducing charge temps.
Injecting pre-turbo also raises the efficiency/mass flow of the turbo itself. Meaning you need less exh energy to turn the turbo. The lack of an IC also means no pressure drop across the core and methanol adds a ton of octane. So you won't need as cool of an air charge to avoid detonation.
So technically if setup properly he found methanol can make more power than an intercooler. Having the ability to tune something like this would be difficult.
It's pretty interesting. His tests were done on an engine ingesting roughly 1000hp worth of air. He found for every 1gph of pure methanol injected pre-compressor would drop his inlet temps about 1.88*. This was calculated using mass flow, not by a useless temperature sensor in the intake tract.
So assuming common 100* under hood turbo inlet temps (@ sea level). 14lbs of boost with a properly sized 70% efficient turbo. Outlet temps will be about 270* F.
That means to get the charge temps down to a reasonable 150* or so you'd need to inject 63.8 GPH of straight meth. Basically 1 gallon per min. When you see the average meth/water kit pump maxes out around .5 gpm (30gph) it's safe to say the typical meth inj kit will never be as efficient as even a cheap china IC at reducing charge temps.
Injecting pre-turbo also raises the efficiency/mass flow of the turbo itself. Meaning you need less exh energy to turn the turbo. The lack of an IC also means no pressure drop across the core and methanol adds a ton of octane. So you won't need as cool of an air charge to avoid detonation.
So technically if setup properly he found methanol can make more power than an intercooler. Having the ability to tune something like this would be difficult.
