lsj air to air problem
01-08-2011, 09:14 PM
#278
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so got to the dyno again this weekend
not bad the iat1 and iat2's were soo close its wasnt even funny.
anyways we started to spray meth and god damn if my car didnt like it.
first the fun numbers... my iat1's were up around 94-95 all day and with meth the iat2's went down to 100 sometimes hitting 99
on one run we let her cool down a bit and my iat2's went 1 degree below iat1 hahaha this works sooo good. anyways the car loved it soo much she started to add her own timming up top, even with my a/f way off cause of meth she went up over 300whp
not bad the iat1 and iat2's were soo close its wasnt even funny.
anyways we started to spray meth and god damn if my car didnt like it.
first the fun numbers... my iat1's were up around 94-95 all day and with meth the iat2's went down to 100 sometimes hitting 99
on one run we let her cool down a bit and my iat2's went 1 degree below iat1 hahaha this works sooo good. anyways the car loved it soo much she started to add her own timming up top, even with my a/f way off cause of meth she went up over 300whp
Ok so he's reading 20psi on his boost gauge, lets just say thats the output of the blower (blower output is higher and should read hotter on the chart I'm about to reference). On page 29 of Maximum Boost there is Figure 3-6 which shows a simplified chart to describe compressor output temperatures based on certain pressure ratios and compressor efficiency (assuming 70* ambient). Since 20psi is ~2.3 pressure ratio and we'll assume 70% efficiency for the TVS (which is high) that puts his output temps at about 290*F.
Now assume that he is actually getting a 5* change across the system. SO the air should be 70* entering and 75* going into the engine. Using on page 52 of Maximum boost his intercooler is 97.72% efficient which would basically mean that everyone in the world should buy that intercooler on the market because it's significantly better than any other air to air intercooler on the market, ie he has done the basically impossible by the laws of physics.
That was fun. My advice would be to not think that the iats read perfect, I know for a fact that my iat2 reads 20* hotter than real life (since on a bone cold engine thats been sitting overnight it reads that much higher than what the thermometer and my ects says).
01-08-2011, 09:29 PM
#280
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I didnt want to have to mess around with figuring out what the hell the volumes of everything was. And the roots blower system is technically a dynamic system when when held at a constant volume and pressure thanks to the fact that the air passes through it in packets and is not continuous (this is what makes blower whine fyi).
01-09-2011, 12:17 AM
#281
I didnt want to have to mess around with figuring out what the hell the volumes of everything was. And the roots blower system is technically a dynamic system when when held at a constant volume and pressure thanks to the fact that the air passes through it in packets and is not continuous (this is what makes blower whine fyi).
My statement regarding your accuracy was more about the IC. The amount of airflow across the IC is an extremely vital variable here. Even if the IC had no fins, if there were millions of cfms passing over it, it would cool the air charge with ease. Heat exchange rates areneeded here, and as such you cant determine an IC's efficiency in a static environment (or rather there is no point in doing so)
Last edited by HunterKiller89; 01-09-2011 at 12:38 AM.
01-14-2011, 04:16 PM
#283
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Ok so I'm back with a slightly more in depth answer, Above is where he says he had iat's within 1 degree of each other, still excluding that he claims iats within 5* of each other. Since I left my thermo textbook at school I'll reference charts and formulas from the copy of Maximum Boost sitting in my lap.
Ok so he's reading 20psi on his boost gauge, lets just say thats the output of the blower (blower output is higher and should read hotter on the chart I'm about to reference). On page 29 of Maximum Boost there is Figure 3-6 which shows a simplified chart to describe compressor output temperatures based on certain pressure ratios and compressor efficiency (assuming 70* ambient). Since 20psi is ~2.3 pressure ratio and we'll assume 70% efficiency for the TVS (which is high) that puts his output temps at about 290*F.
Now assume that he is actually getting a 5* change across the system. SO the air should be 70* entering and 75* going into the engine. Using on page 52 of Maximum boost his intercooler is 97.72% efficient which would basically mean that everyone in the world should buy that intercooler on the market because it's significantly better than any other air to air intercooler on the market, ie he has done the basically impossible by the laws of physics.
That was fun. My advice would be to not think that the iats read perfect, I know for a fact that my iat2 reads 20* hotter than real life (since on a bone cold engine thats been sitting overnight it reads that much higher than what the thermometer and my ects says).
Ok so he's reading 20psi on his boost gauge, lets just say thats the output of the blower (blower output is higher and should read hotter on the chart I'm about to reference). On page 29 of Maximum Boost there is Figure 3-6 which shows a simplified chart to describe compressor output temperatures based on certain pressure ratios and compressor efficiency (assuming 70* ambient). Since 20psi is ~2.3 pressure ratio and we'll assume 70% efficiency for the TVS (which is high) that puts his output temps at about 290*F.
Now assume that he is actually getting a 5* change across the system. SO the air should be 70* entering and 75* going into the engine. Using on page 52 of Maximum boost his intercooler is 97.72% efficient which would basically mean that everyone in the world should buy that intercooler on the market because it's significantly better than any other air to air intercooler on the market, ie he has done the basically impossible by the laws of physics.
That was fun. My advice would be to not think that the iats read perfect, I know for a fact that my iat2 reads 20* hotter than real life (since on a bone cold engine thats been sitting overnight it reads that much higher than what the thermometer and my ects says).
01-31-2011, 11:09 AM
#287
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just read this thread and everyones ideas just want to say good job Freakta and you right if we all shared more I would not have to hear people call me a slow balt owner I know I am a noob and all but hey these cars have tons of potential love the work you have told us all keep it up
05-31-2011, 02:47 AM
#290
fred has been driving it around street tuning the setup. i had my harley in the way taking money up and then i paid cash for a g35 (impulse buy)
but he is street tuning the car and then it will be on the dyno soon.
and to the ones readding too much into psi and temps and thermal intercoolers... im reading you what my car is telling me. and hptuners is telling me. who am i to judge the cars sensor.
but he is street tuning the car and then it will be on the dyno soon.
and to the ones readding too much into psi and temps and thermal intercoolers... im reading you what my car is telling me. and hptuners is telling me. who am i to judge the cars sensor.
08-31-2013, 02:10 AM
#294
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If I'm reading this correctly, the air filter and said piping would run into one end if the intercooler, and on the other side, piping from the intercooler to the blower inlet?
09-25-2013, 02:20 PM
#295
Wow I did not know this still existed. Hot side.... Runs from supercharger to intercooler and cold side runs from intercooler to engine. Intake still runs into supercharger... Sorry if I read that wrong.
Cat split a sleeve and was put on a shelf cause life got in the way. But I'm back at it and we will see what happens now.
Cat split a sleeve and was put on a shelf cause life got in the way. But I'm back at it and we will see what happens now.
